Maxon Telecom Car Stereo System SM 2000 User Manual
SM-2000  
SERVICE MANUAL  
MAXON AMERICA, Inc.  
10828 N. W. Air World Drive  
Kansas City, MO 64153  
Phone 816-891-6320 Fax 816-891-8815  
680-100-0045 Revision C ECO 98017  
December 98  
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MAXON SM-2000 MOBILE  
TABLE OF CONTENTS  
TABLE OF CONTENTS  
Table Of Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i  
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Transceiver Nominal Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Tx Tone Modulation Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Sub Audible Tones - DCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Rx Tone Demodulation Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Reliability Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Programmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Unpacking Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Description Of Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
Theory Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
RF Section (SM-2150/VHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
RF Section (SM-2450/UHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
SM-2150/VHF Alignment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
Alignment Points Diagram (SM-2150/VHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
SM-2450/UHF Alignment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
Alignment Points Diagram (SM-2450/UHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
Component Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
Surface Mount Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
Surface Mount Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
Surface Mount Component Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
Surface Mounted Integrated Circuit Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
Parts List Common to SM-2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34  
Electrical Parts List Main Board Digital Section (SM-2000) . . . . . . . . . . . . . . . . . 35  
Electrical Parts List Band Chart (SM-2150/VHF) . . . . . . . . . . . . . . . . . . . . . . . . . 37  
Electrical Parts List Main Board (SM-2150/VHF) . . . . . . . . . . . . . . . . . . . . . . . . . 38  
Electrical Parts List Band Chart (SM-2450/UHF) . . . . . . . . . . . . . . . . . . . . . . . . . 42  
Electrical Parts List Main Board (SM-2450/UHF) . . . . . . . . . . . . . . . . . . . . . . . . . 44  
Component Pinout (SM-2000). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48  
Voltage Charts (SM-2150/VHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51  
Voltage Charts (SM-2450/UHF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54  
Trouble Shooting Chart (SM-2000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57  
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MAXON SM-2000 MOBILE  
TABLE OF CONTENTS  
Schematics and Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59  
SM-2150/VHF Front End Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59  
SM-2450/UHF Front End Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59  
SM-2000 TCXO Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59  
MA-4472 Microphone Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60  
SM-2000 Control Head Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60  
SM-2000 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61  
SM-2000 Digital Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62  
SM-2150/VHF RF Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63  
SM-2450/UHF RF Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64  
PCB Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65  
SM-2000 Control Head PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65  
SM-2150/VHF PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66  
SM-2450/UHF PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67  
SM-2000 Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68  
SM-2000 Exploded View Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69  
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MAXON SM-2000 MOBILE  
SPECIFICATIONS  
SPECIFICATIONS  
TRANSCEIVER NOMINAL PERFORMANCE  
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FTZ 17TR2049 July 88  
TIA/EIA-603  
IEC 68 Series  
EC 529 IP54  
MIL STD 810 C,D,E  
RF Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 W  
Modulation Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G3E/F3E (PM/FM)  
Audio power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 W  
Intermediate frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 MHz  
455 kHz  
Number of Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Frequency Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Synthesizer  
GENERAL  
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 VDC nominal CEPT  
15.6 VDC maximum (extreme)  
10.8 VDC minimum (extreme)  
13.8 VDC nominal TIA/EIA-603  
Temperature Range  
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80°C Maximum; -40°C Minimum  
(Extreme)  
Operating (to spec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25°C Nominal;  
60°C Maximum; -30°C Minimum  
(Extreme)  
Current Consumption  
DC Current  
Standby (Muted)  
< 140 mA  
Unmuted  
25% Max. AF power  
50% Max. AF power  
100% Max. AF power  
< 350 mA  
< 450 mA  
< 570 mA  
Transmit  
1 Watt RF power  
3 Watts RF power  
25 Watts RF power  
1.6 A  
2.4 A  
6.7 A  
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MAXON SM-2000 MOBILE  
SPECIFICATIONS  
Switching range TX and RX (without re-tuning)  
Operational Bandwidth  
TX RX  
BAND  
MIN  
MAX  
MIN  
MAX  
VHF Band 1  
136  
148  
162  
136  
148  
162  
VHF Band 2  
174  
174  
UHF Band 1  
UHF Band 2  
UHF Band 3  
UHF Band 4  
UHF Band 5  
400  
420  
440  
470  
490  
430  
450  
470  
490  
512  
400  
420  
440  
470  
490  
430  
450  
470  
490  
512  
Channel spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 kHz / 20 kHz / 12.5 kHz  
programmable  
(25 kHz - 12.5kHz switchable  
by CPU control)  
Dimensions (in / mm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2(H) x 7(W) x 6.25(D)  
45(H) x 157(W) x 140(D)  
Weight  
3lbs, 6oz/ 1.6kg (with mic)  
TRANSMITTER  
Tests methods are ETS 300 086 Jan  
1991 unless stated  
Performance Without Sub audible Modulation  
Carrier Power @ nominal conditions  
Max. Rated Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 W +/-10% nominal  
25 W +2/-3 dB @ extreme conditions  
across switching range  
Hi Switched by CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 – 25 W  
Continuously adjustable  
Low Switched by CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 – 3 W  
Continuously adjustable  
Frequency stability (SM-2150) . . . . . . . . . . . . . . . . . . . . . . . . . . . +5.0 ppm (+ 0.00025%)  
Frequency stability (SM-2450) . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.5 ppm (+ 0.00025%)  
Peak audio frequency deviation  
(across switching range)  
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MAXON SM-2000 MOBILE  
SPECFICATIONS  
Without sub audible tone  
modulation  
With sub audible tone modulation  
@ 10% peak deviation  
Channel Spacing  
(kHz)  
MAX DEV  
+ 5.0 kHz  
+ 2.5 kHz  
25  
+ 5.0 kHz  
12.5  
+ 2.5 kHz  
Audio characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (Method as FTZ 17 TR 2049 July 1988)  
MOD Type G3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Within +1/-3 dB of 6 dB/octave  
pre-emphasis curve:  
300 Hz – 2.55 kHz for 12.5 kHz  
Channel Spacing  
300 Hz – 3 kHz for 20 , 25 kHz  
Channel Spacing  
MOD Type F3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Within +1/-3 dB of 6 dB/octave  
pre-emphasis curve:  
300 Hz – 2.55 kHz for 12.5 kHz  
Channel Spacing  
300 Hz – 3 kHz for 20 , 25 kHz  
Channel Spacing  
Adjacent channel power  
25 kHz  
12.5 kHz  
< 70 dBc  
< 60 dBc  
TX spurious emissions (conducted)  
9 kHz – 1 GHz  
1 – 4.0 GHz  
< -36 dBm  
< -30 dBm  
TX spurious emissions (radiated)  
9 kHz – 1 GHz  
1 – 4.0 GHz  
< -36 dBm  
< -30 dBm  
TX spurious emissions (radiated)  
9 kHz – 1 GHz  
1 – 4.0 GHz  
< -36 dBm  
< -30 dBm  
Modulation limiting characteristics . . . . . . . . . . . . . . . . . . . . . . . Method as FTZ17 TR2049 July 1988  
=75% peak deviation  
Transmitter audio distortion (without CTCSS) . . . . . . . . . . . . . . Method as FTZ17 TR 2049 July 1988  
1 kHz modulation input  
< 5 %  
Transmitter audio distortion (with CTCSS) . . . . . . . . . . . . . . . . . Method as EIA RS 220A Mar 79  
Audio frequency 1 kHz  
Any CTCSS frequency combined  
< 8 %  
Hum & noise (residual modulation) . . . . . . . . . . . . . . . . . . . . . . . . > 40 dB  
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MAXON SM-2000 MOBILE  
SPECIFICATIONS  
TX TONE MODULATION CHARACTERISTICS  
Sub audible tones - CTCSS  
Tone range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 – 250 Hz @ 0.3 % accuracy  
Tone standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RS-220A EIA Standard  
Non-standard tones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 – 260 Hz @ 0.3 % accuracy  
Nominal tone deviation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 % peak system deviation  
SUB AUDIBLE TONES - DCS  
Tone standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Normal and inverted  
Nominal tone deviation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 % peak system deviation  
RECEIVER  
Performance without sub audible modulation. . . . . . . . . . . . . . . Method ETS 300-086 JAN 1991  
unless stated  
Sensitivity 12 dB SINAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < - 118 dBm  
Amplitude characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 3 dB  
Co-channel rejection  
25 kHz  
12.5 kHz  
<- 6 dB  
<- 10 dB  
Adjacent channel selectivity  
25 kHz  
12.5 kHz  
> 70 dB @ nominal conditions  
> 60 dB @ nominal conditions  
Spurious response rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 70 dB (100 kHz - 4 GHz)  
Intermodulation response rejection  
+ (25 kHz & 50 kHz)  
+ (50 kHz & 100 kHz)  
> 65 dB (3 generator method)  
Blocking  
+ 1 MHz  
+ 5 MHz  
+ 10 MHz  
> 85 dB  
> 85 dB  
> 85 dB  
RX spurious emissions (conducted)  
9 kHz – 1 GHz  
1 GHz – 4.0 GHz  
- 57 dBm  
- 47 dBm  
RX spurious emissions (radiated)  
9 kHz – 1 GHz  
1 – 4.0 GHz  
-57 dBm  
-47 dBm  
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MAXON SM-2000 MOBILE  
SPECIFICATIONS  
AF power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 W maximum @10% Distortion into a  
4 ohm load. 4 Watts nominal.  
AF frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Method as FTZ 17 TR 2049 July 1988  
MOD Type G3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Within +1/-3 dB of 6 dB/octave  
de-emphasis curve  
300 Hz – 2.55 kHz for 12.5 kHz  
Channel Spacing  
300 Hz – 3 kHz for 25 kHz  
Channel Spacing  
MOD Type F3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Within +1/-3 dB of 6 dB/octave  
de-emphasis curve  
300 Hz – 2.55 kHz for 12.5 kHz  
Channel Spacing  
300 Hz – 3 kHz for 25 kHz  
Channel Spacing  
RX Hum & Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 40 dB  
RX TONE DEMODULATION CHARACTERISTICS  
Subaudible tones - CTCSS/DCS  
CTCSS tone range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Hz to 250 Hz  
CTCSS tone standard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RS-220A EIA Standard  
CTCSS non-standard tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 – 260 Hz  
DCS tone standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standard and inverted  
Decode Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Method: Decrease signal level @ 10%  
peak deviation  
All tone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <= 9 dB SINAD  
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IEC529 level IP54 MIL STD 810C  
EMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EMC Directive 89/336/EEC May 1989  
ETS 300.279  
ACCESSORIES  
MA4472 Microphone  
RELIABILITY ANALYSIS  
Calculation method  
MTBF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15,000 Hr. MIL-HDBK-217F. Ground  
benign. Parts stress method.  
MTTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Min. (Average time to rework any  
SMD component & reassemble).  
PROGRAMMER  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMP4004C  
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December 98  
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MAXON SM-2000 MOBILE  
INTRODUCTION  
INTRODUCTION  
Advanced state-of-the-art technology is used in the design and manufacturing of the SM-2000 Mobile. The  
Phase Lock Loop (PLL) synthesizer provides more flexibility and capability in the SM-2000 Mobile. This  
scanning mobile has 4 channel capability. It offers CTCSS, DCS, scanning, priority channel, and many other  
functions. All these functions are controlled by the micro controller. The micro controller reads specific  
channel information from an Electronically Erasable Programmable Read Only Memory (EEPROM).  
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MAXON SM-2000 MOBILE  
UNPACKING INFORMATION  
UNPACKING INFORMATION  
Check the carton carefully for the following items:  
1
2
3
4
5
6
Transceiver Unit  
Microphone  
DC Power Cord  
Mobile Mounting Bracket  
Assembly Hardware  
Operating Guide  
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MAXON SM-2000 MOBILE  
GENERAL DESCRIPTION  
GENERAL DESCRIPTION  
The Maxon SM-2000 is a rugged two way FM mobile radio which operates from 136-174 MHz (VHF) in  
two bands & 400-512 MHz (UHF) in five bands. The SM-2000 is a synthesized radio utilizing  
microcomputer technology to provide reliable high quality simplex two-way mobile communications. The  
SM-2000 transmitter output power level is 25 watts over a wide bandwidth, with a receiver operational  
bandwidth that covers the specified frequency band. The basic radio package includes the following  
features:  
•
•
•
•
•
•
•
•
•
•
Microprocessor Control  
Synthesized RF Channel Selection (Frequency Control)  
CTCSS Encode / Decode  
DCS Encode / Decode  
Priority Channel Scan  
5 PPM Frequency Stability (SM-2150/VHF)  
2.5 PPM Frequency Stability (SM-2450/UHF)  
Field Programmable with PC  
Internal 4 watt speaker, with Volume Control  
Busy Channel Lockout  
The small size of the SM-2000 radio makes it ideal for front mounting in conventional vehicles. The radio  
is operated with a simple hand held microphone in combination with the operating controls described in the  
following section.  
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MAXON SM-2000 MOBILE  
DESCRIPTION OF CONTROLS  
DESCRIPTION OF CONTROLS  
Figure 1 SM-2000 Front Panel  
DESCRIPTION OF CONTROLS  
The controls, indicators and microphone/programming connector are located on the front panel. The  
Monitor and Auxiliary buttons are located on the radio’s front panel. The following table details the  
Mobile controls, indicators, and connections.  
TABLE 2  
Controls, Indicators, And Connections  
ITEM  
FUNCTION  
Rotary switch, used to select one of 4 channels (max.) and to engage  
scanning function  
1. Channel Select Switch  
Main power switch and volume control. Fully counter clockwise is off  
position  
2. ON/OFF Volume Control  
3. Microphone Connect Jack  
4. Busy/Call/TX  
Used to connect the microphone to the mobile  
Tri-colored LED indicator  
5. Auxiliary (AUX) Switch  
6. Monitor Switch  
Used for control of after market accessories  
When pushed, monitors the chosen channel  
Indicates the channel when illuminated  
7-10. Channel Indicator LED’s  
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MAXON SM-2000 MOBILE  
DESCRIPTION OF CONTROLS  
Rear Panel Connections  
ITEM  
FUNCTION  
1. Antenna Connector ( S0-239 )  
2. DC Power Connector  
50 ohm connector  
Used to connect the mobile to the power supply 13.2 VDC or 13.8 VDC  
U.S.A.  
Multipurpose socket used to connect to a remote speaker or for test  
connection  
3. External Speaker Connector  
Figure 2 SM-2000 Rear Panel  
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MAXON SM-2000 MOBILE  
THEORY OF OPERATION  
THEORY OF OPERATION  
Each of the Scanning Mobile radios, UHF & VHF, include a unique main P.C.B. consisting of RF, Digital  
and Analog circuitry.  
DIGITAL CIRCUITRY  
IC 411 and IC412 are digitally-controlled analog switches which internally consist of three single pole,  
double throw switches. By placing a high (5V) or low (0V) on the control lines which consists of A,B, and  
C. “A” controls the X ports “B” controls the Y ports and “C” controls the Z ports. Example: A high on  
control “A” would connect X to X1. A low on control “A” would connect X to X0.  
CTCSS/DCS Decode Circuits  
Discriminator audio from Pin 9 of IC 109 is fed to IC 406 and associated parts, which are the first 2 poles  
of a 6th order 250Hz Chebeyshev low pass filter. The output from Pin 1 (IC406A) is fed into IC411 (Pin 2)  
and output to Pin 15 (IC411). The signal is then fed to Pin 8 (IC407) which is a 6th order low pass  
Butterworth switched capacitor filter. The output from the Butterworth filter (Pin 3 IC407) is then fed to  
the remaining 4 poles of the 6th order Chebeyshev, which consist of IC 406C and one of the two  
operational amplifiers internal to IC407 (MF6-100) along with associated components. Both the  
Chebeyshev and the Butterworth combines for a 4dB ripple low pass filter when programmed for 250Hz.  
The output of IC406C(Pin 8) is fed into the remaining operational amplifier internal to IC407 (MF6-100)  
which forms the squaring circuit for the Decode signal. The signal is output from Pin 2 IC407 (MF6-100)  
and fed into IC409 (micro) where it is matched with a preprogrammed frequency. If successful a Decode  
occurs, which is shown by a green L.E.D. on the front panel of the UHF Scanning Mobile and audio is  
heard. If valid Decode was not seen, the busy L.E.D. (Yellow) would be shown.  
CTCSS/DCS Encoder Circuit  
During TX encode the tone squelch digital signal is produced as a 3-bit parallel word at Pins 15 (A), 16  
(B), and 18C of the micro controller (IC409). The 3-bit digital signal is converted to an analog signal by  
resistors R427, 428, and 430. The analog signal is fed into IC411 Pin 1. The signal is output on Pin 15  
(IC411) and fed into Pin 8 of IC407 (6th order Butterworth clock tuned low pass filter). The filtered  
encode output from Pin 3 (IC407) is fed into Pin 13 (IC411) and output on Pin 14 (IC411).  
The filtered encode signal is fed to IC405B and RV403 (sub-audible gain control), the output of IC405B is  
then fed to the audio mixer circuit.  
Channel Select Circuit  
One of 4 channels may be selected using the channel switch on the front panel. The channel switch SP4T  
(single pole 4 throw) with output to 4 channel LED’s and to diode’s to be converted to an inverted 4-Bit  
binary code. The binary code inverted is equal to the channel number. The binary code is decoded by the  
micro controller enabling the appropriate RX or TX frequency and associated data to be selected from the  
EEPROM.  
•
NOTE:It is possible any one of the 4 channel locations can be a scanning position. Refer to  
Operators Manual for further instructions.  
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THEORY OF OPERATION  
EEPROM  
RX/TX channels, CTCSS/DCS as well as other data from the programmer are stored in the EEPROM. The  
data stored is retained without power supplied. This is a non-volatile memory. The EEPROM may have  
information re-programmed or erased. IC408 is an EEPROM with 2048 (256x 8) bit capacity and data is  
written and read serially, with the Programming cable through the front panel microphone connector.  
High Pass Filter  
The high pass filter is an 8-pole .1dB chebeyshev active filter that comprises IC410 and associated  
components. The de-emphasis is provided by resistor R451 and capacitor C452. Receive audio is passed  
to IC410 by Pin 4 of IC411 where sub-audible tones below 250Hz are removed. Mic audio is also fed into  
IC410 via IC411 (Pin 4) where sub-audible voice products below 250Hz are also removed.  
Mute (Squelch) Circuit  
The mute circuit which is controlled by the output of IC409 (micro) pin 77 (386) is connected to Q409 via  
R438 which opens analog gate IC401D and mutes the audio path to the AF amplifier, in conjunction with  
Q137 shorting the input to audio amp IC108.  
TX Audio and Filter Circuits  
Microphone audio from front panel (via IC412), is fed into IC401A, and into IC404B (Pin 6). The TX  
audio is output on Pin 7 (IC404B) and into the high pass filter (IC410), where sub-audible voice products  
are removed. The TX audio output from IC410 is fed into IC404A&B which with associated parts form a  
pre-emphasis mic amplifier and limiter. The output from Pin 1 IC404A is fed to RV402 (TX Modulation  
Level Adjust) and fed into IC404C&D with associated parts to form a 3kHz low pass filter. The output of  
IC404D (Pin 14) is then fed into the Audio Mixer Circuit.  
Audio Mixer and Inverter  
IC405A is an audio mixer where audio and sub-audible tones are combined. RV403 is used as a level  
control for the Sub-audible tones. This level is summed with amplified, pre-emphasized, and limited audio  
and feed to IC405A, which is an inverting amplifier. The output is fed to the VCO and TCXO to provide  
the necessary modulation signal.  
Analog Ground Supply  
IC406D supplies analog ground (2.0V) to all operational amplifier circuits except for IC405A and IC405D.  
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THEORY OF OPERATION  
PLL  
IC101 (MC1459IF) is a PLL frequency synthesizer with an on-board 1.1 GHZ divide by 64/65 dual  
modulus prescaler. In addition to the prescaler and frequency counters, the synthesizer IC has a a phase  
detector and a C register (Configuration register) that allows certain functions to be configured as desired.  
The synthesizer is serially controlled by three wire input to the IC. Serial data is fed to pin 19 of the IC.  
Serial data CLK (pin 18) and active low ENABLE (pin 17) are the input pins that allow data transfer into  
the integrated circuit for control and frequency selection.  
Data transfer is byte-oriented and may be shifted in 1, 2 or 3-byte patterns. One byte (8 bits) accesses the C  
or configuration register, two bytes (16 bits) access the R register and 3 bytes (24 bits) access the A  
register.  
Internally the synthesizer has three counters used as frequency dividers. These counters are the R,A and N  
counters. The R counter is actually controlled by 3 bits of the R register while the remaining 13 bits  
determine the divide by R value. The frequency at pin 20 (12.8 MHz) is divided by R to determine the  
frequency steps of the PLL synthesizer. In programming the radio, 5.0 kHz or 6.250 kHz step sizes can be  
selected for any channel.  
The 24- bit A register controls the N and A (prescaler) counts. Together these counts determine the total  
synthesizer divide ratio affecting the f (frequency input) signal from the VCO. A0-A7 are the A counter  
in  
values. A8-A19 are the N counter values. A21 and A20 must always be set high. A23 and A22 are both  
set to 0 which controls the function of output A and causes it to be a port. This port, output A, is used to set  
TX power high or low. A high output on port A sets transmit power low.  
The 8-bit C register performs control functions as stated:  
C7 sets polarity of the phase detector bits. Logic “0” is normal.  
C6 determines the phase detector used. A logic “0” selects theta V and theta R outputs  
C5 enables the lock detector when its logic is “1”.  
C4 when a logic “1”, puts CMOS sections in standby mode.  
C3 and C2 set phase detector current at the PD output. Not used in this application.  
C1 is the value present at Output A.  
C0 is the value present at Output B.  
Transistors Q101 through Q104, along with related resistors and capacitors, connect the dual pin theta V  
and Theta R outputs into a 2 mA current source that is powered by a 20V DC to DC converter. This allows  
the tuning voltage to be approximately 3 to 17 VDC.  
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THEORY OF OPERATION  
RF SECTION (SM-2150/VHF)  
VHF Transmitter  
The Transmitter is comprised of:  
1.  
2.  
3.  
4.  
Microphone Audio Circuit  
Transmitter Stage and Harmonic Filter  
Automatic Power Control  
Frequency Synthesizer Circuit  
Microphone Audio Circuit  
Microphone audio from the digital circuitry is amplified, pre-emphasized, limited, and mixed with  
Sub-Audible and applied to the VCO at Pin 1, through RV101, to balance VCO and TCXO modulation.  
Transmitter Stage and Harmonic Filter  
When in the transmit mode of operation the diode D103 is forward biased enabling the RF signal to pass to  
the pre-driver Q118 by Q116 and Q117. The amplified RF signal is amplified again by Q120. The  
amplified RF signal passes through the stripline coupler and is fed to the harmonic low pass filter,  
comprising of L128, L130, L131, and L132, capacitor 271, 273, 275, 277, and 283 and then to the antenna  
connector (ANT). The stripline coupler provides a sample of the RF signal for the automatic power  
control. During transmit D107 is forward biased which connects the power amp, D120, to the antenna.  
D120 is forward biased inhibiting transmit signal power from being fed to the receiver circuitry.  
Automatic Power Control  
The automatic power control contains the stripline coupler, diode D107 and variable resistor VR104,  
IC104A, and three transistors Q123, Q124, and Q125. IC104A forms a differential amplifier. The RF  
signal present in the coupler is rectified by D107, to produce a DC voltage proportional to RF power which  
is applied to Pin 3 of IC104A. TX 8.5V is also applied to the input of IC104A via the potential divider  
R168, VR104, and R170 at pin 2. The different signal at output of IC104A is passed to Q124 and Q125 to  
produce a constant power output to the antenna connector (ANT). VR104 is used to adjust the RF high  
power level. VR105 is used to set the low power setting.  
RX & TX Voltage Controlled Oscillator Circuit  
The circuit contains two VCO’s. One for producing carrier frequencies during transmit and one for  
producing the local oscillator frequency during receive. The circuit also has RX and TX power line filters.  
RX & TX Power Line Filters  
Transistors Q353 and Q354 are configured as TX5v and RX5v power supply ripple filters respectively.  
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THEORY OF OPERATION  
RX VCO  
The RX VCO comprises JFET Q351, coil L356 and varactor D353 and is configured as a Colpits oscillator.  
D353 produces a change in frequency with a change in DC voltage and is controlled by the phase detector  
signal present at the anode. The local oscillator signal at the drain of Q351 is applied to RF out of the  
module when diode D103 is reverse biased and D104 is forward biased. L356 is used for PLL alignment.  
TX VCO  
The TX VCO comprises JFET Q352 coil L353 and varactor D352 and is configured as a colpits oscillator.  
The AF signal at MOD port is applied to the cathode of D352. The control voltage from the loop filter is  
applied to the drain of Q352 and is passed to the power amplifier and harmonic filter via the buffer Q113  
and Q114. When diode D103 is forward biased and D104 is reversed biased L353 is used for PLL  
alignment.  
Loop Filter  
Transistor Q101 to Q104 and associated components form a loop filter. The phase detector from Pin3 and  
4 of IC101 are filtered to remove any reference frequency harmonics and applied to the voltage controlled  
oscillator.  
PLL Frequency Synthesizer  
The PLL frequency synthesizer (IC101) contains an oscillator for the reference divider, a programmable  
divider, a phase/frequency Comparator and an out of lock detector and a Prescaler.  
Reference Oscillator  
The reference oscillator of IC01 along with a 10.25 or 12.8MHz TCXO, varactor diode D701 and D702,  
and the thermistors TH701, TH702, and TH703 produce a temperature compensated 10.25 or 12.8MHz  
reference.  
Programmable Dividers  
The serial frequency data (DATA) is received by the data programmable divider at Pin 19 of IC101 from  
Pin 1 of IC409 (Micro controller) out. The internal Prescaler divided input frequency at pin 11 of IC1 is  
further divided by the programmable divider. The 10.25 or 12.8MHz TCXO frequency at pin 20 is the  
reference divider to produce a reference frequency of 5 or 6.25kHz respectively. The internal  
programmable divided frequency (Fv) and the reference frequency (Fr) are fed to the internal phase  
detector.  
Phase Detector  
The phase detector produces negative pulses when Fv < Fr, positive pulses when Fv>Fr. When Fv = Fr and  
phase is the same, the phase detector presents a high impedance at Pin 4. The signal at Pin 2 is applied to  
the VCO via the loop filter.  
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THEORY OF OPERATION  
Out of Lock Detector  
The out-of-lock detector produces a high logic level when Fr and Fv are in the same phase and frequency,  
low logic level pulses when the loop is out-of-lock at Pin 2 of IC101. The signals at Pin 2 of IC101 are  
buffered by Q106 and then integrating by R114 and C122. The product of the integrating circuit is fed to  
L/D port.  
Prescaler  
The internal Prescaler of IC101 divides the incoming signal frequency from the VCO via input pin 1 by 64  
or 65. The divided VCO frequency is passed to the 6-stage A counter and 12-stage N counter.  
Receiver  
The receiver uses Dual Conversion Superheterodyning techniques, it is comprised of:  
1.  
2.  
3.  
4.  
5.  
RF amplifier  
First Mixer and First IF Amplifier  
Second Mixer, Second IF Amplifier and FM Detector  
Receiver Audio Circuit  
Mute (squelch) Circuit  
RF Amplifier  
The signal received via the antenna is routed through the 9th chebyshev low-pass filters containing  
capacitors C273, C275, C277, C280, C283 and coils L128, L130, L131, L132, and is passed through the  
front-end module (RF amplifier) via pin 1. The front-end module contains L800 to L806 and Q800. The  
front-end module is configured to enable the RF signal at the operating frequency to pass the first mixer.  
First Mixer and First IF Amplifier  
The VCO local oscillator signal routed through buffer transistor Q113 and Q114 is filtered by C164, C165,  
C281, C310, and L110, L123. IC102 produces a difference frequency IF of 45MHz from pin 6 of the  
front-end module and the filtered VCO local oscillator signal at pin 1. The 45MHz difference frequency is  
filtered by the 2-pole crystal filter CF101. The tuned circuit T101 and T102 and associated components  
provide matching of the crystal filter to insure good band-pass response and selectivity. The IF signal is  
amplified by Q130 and passed to the second mixer, second IF and FM detector IC109.  
Second Mixer, Second IF and FM Detector  
A signal conversion FM receiver integrated chip, IC109 contains the second mixer, second IF and FM  
detector functions. The second local oscillator frequency is determined by the crystal X101 connected to  
pin 1 of IC109. The IF signal is received at pin 16 of IC109 via R203 and coupling capacitor C182. The  
second IF frequency of 455kHz is produced when the different frequency is applied to the mixer via Pin 6.  
The output of the second mixer via Pin 3 is applied to a 455kHz band-pass filter, CF104 for 25kHz and  
CF103 for 12.5kHz channel spacing. The output of CF104 is passed to a high gain IF amplifier (limiter) in  
IC109 via Pin 5. The amplified signal is coupled to the adjustable quadrature detector T103. Any detected  
signal is produced at Pin 9 of IC109 and applied to the Receiver Audio Circuit and the Mute (Squelch)  
Circuit.  
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THEORY OF OPERATION  
Receiver Audio Circuit  
The receiver audio circuit is comprised of a low pass filter and an audio amplifier on the RF PCB.  
Low Pass Filter  
The low pass filter is configured from coil L227, capacitor C201 and resistor R206.AF signals from Pin 9  
of IC109 are filtered by the low pass filter to remove any components of the 455kHz IF signal. The filtered  
is passed to the high pass filter.  
High Pass Filter  
The de-emphasized audio signal from the high pass filter is fed to the audio amplifier (IC108).  
Audio Amplifier  
IC108 is the audio amplifier. The audio signal is passed to IC108. The gain of the amplifier is set by  
resistor R153. The amplified audio signal at Pin 4 of IC108 is applied to the external speaker.  
Mute (Squelch) Circuit  
The squelch circuit switches off the audio power amplifier in the absence of audio signal. The squelch  
circuit comprises a 50kHz pass band filter, squelch control (RV103) and a noise detect circuit.  
The audio signal from Pin 9 of IC 109 is filtered by the 50kHz bandpass filter formed by L228, L229,  
C191, C192, and C193. The noise in the IF pass band is accepted, frequencies in the voice frequency band  
are rejected and noise present at the output of the filter is applied to the noise detect circuit via RV103.  
RV103 is used to adjust the squelch sensitivity.  
Noise Detect Circuit (SQ Board)  
The noise detect circuit in conjunction with IC109 consists of transistor Q133 and Q132, thermistor TH101  
and diode D125. Any noise signal present is applied to the base of Q133 of the SQ circuit from Pin 11 of  
IC109. The signal is amplified by Q133 rectified by D11 and then buffered by Q132. The buffered signal  
output is applied to the squelch trigger of IC109 Pin 12 via resistor R200. The squelch trigger out put (Pin  
13 of IC109) is applied to the Micro controller on the Digital circuit. When noise is present, the voltage at  
Pin 12 of IC109 exceeds 0.7V, the squelch trigger output is 0V (logic0) muting the receiver audio circuit.  
When no noise is present the voltage at Pin 12 of IC109 is less than 0.7 and Pin 13 of IC109 is at 5V  
(logic1), unmuting the audio circuit.  
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MAXON SM-2000 MOBILE  
THEORY OF OPERATION  
RF SECTION (SM-2450/UHF)  
UHF Transmitter  
The Transmitter is comprised of:  
1. Microphone Audio Circuit  
2. Transmitter Stage and Harmonic Filter  
3. Automatic Power Control  
4. Frequency Synthesizer Circuit  
Microphone Audio Circuit  
Microphone audio is pre-emphasized, limited and mixed with sub-audible tones to provide the modulating  
signal for the transmitter. This combined modulation is applied to TCXO modulation pin 1 and also to the  
VCO modulation input via RV101 to effect 2-point modulation. RV101 is a modulation balance control  
that equalizes modulation sensitivities of the two oscillators.  
Transmitter Stage and Harmonic Filter  
Power Amplifier IC103 is an RF Module. In transmit, diode D103 is forward biased allowing the RF signal  
to pass to the input of IC103 via Q116 and Q117. The amplified RF output passes through the stripline  
coupler and is fed to the harmonic low pass filter, consisting of spring coils L118, L120, L121 and L125  
and capacitors C271, 273, 275, 277 and 280, and then to the antenna connector. The stripline coupler  
provides a sample of the RF signal for automatic power control. During TX, D108 connects the power amp  
to the antenna. D120 and D121 are forward biased reducing transmit signal power at the receiver input.  
Automatic Power Control  
The automatic power control contains the stripline coupler, diode D107, and variable resistor RV104, op  
amp IC104 , and two transistors: Q124 and Q125. IC104 acts as a differential amplifier. The RF signal is  
rectified by D107 to produce a DC voltage, proportional to RF power, that is applied to IC404 pin 3.  
Voltage divider R168, RV104 and R170 monitors TX 8.5V dc to develop a reference for IC104A pin 2.  
The difference at the output of (IC104 pin 1) is passed to Q124 and drives the collector of Q125. This  
feedback controls the gain of IC103 to maintain a constant RF power output. RV104 is used to adjust the  
RF high power level. RV105 is used to set the low power setting.  
Frequency Synthesizer Circuit  
With data received from the EEPROM ( IC408 ) the frequency synthesizer circuit controls and produces  
the RF carrier frequency for the transmitter during transmit and the local oscillator frequency for the  
receiver.  
The frequency synthesizer circuit is comprised of:  
1. RX and TX voltage controlled oscillator module.  
2. Loop Filter  
3. PLL Frequency Synthesizer  
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MAXON SM-2000 MOBILE  
THEORY OF OPERATION  
Voltage Controlled Oscillator Circuit  
The circuit produces carrier frequencies during transmit and local oscillator frequencies during receive.  
Transistor Q107 is configured as a power supply ripple filter. The VCO utilizes transistor Q108, varactor  
D101 , D102 and trimmer capacitor TC101 . These components are configured as a Colpitts oscillator.  
D101 and D102 produce a change in frequency with a change in DC voltage and are controlled by the  
phase detector. Q110 and Q111 are an amplifier and buffer for the output of the oscillator.  
Receiver  
The receive signal passes through the low pass filter, then onward to pin 1 of the Front End module. A  
bandpass filter consisting of C801-C810 (see band chart for different band values) and L801-L803 is  
coupled to the base of Q801 (2SC5084) which is the RF amplifier. Diode D801 serves as protection from  
static and RF overload from nearby transmitters. The output of Q801 is coupled to a second bandpass filter  
consisting of C812-C824 and L804-L807. The output of the Front End ( pin 6) is coupled to the double  
balanced mixer IC102. The receiver Front End Module is factory pre-tuned and requires no field  
adjustment. Repair is effected by replacement of the entire (properly banded) module. Frequency bands are  
listed in the SPECIFICATIONS section of this manual.  
The receiver Front End module pin-outs are:  
1. RF Input  
2. Input Ground  
3. Ground  
4. Receive +5VDC  
5. Output Ground  
6. RF Output  
First Mixer  
IC102 is a Double Balanced Mixer which provides a 45MHz intermediate frequency output. The filtered  
frequency from the Front End is coupled to signal input pin3 of the mixer. The Local Oscillator from the  
VCO module runs 45MHz lower than the receive frequency and is coupled to IC102 at pin6. The resultant  
IF output exits at mixer pin2. The 45MHz IF output is matched to the input of the 4 pole monolithic crystal  
filter by C179 , L119 , C172 and C173 . The crystal filter provides a bandwidth of + and - 7.5kHz from the  
operating frequency for the signal providing a high degree of spurious and intermodulation protection.  
Additionally, a 90MHz trap is placed at the filter input to provide additional attenuation of the second order  
IMD (Intermodulation Distortion). The output of the filter is impedance matched by T101 , C175 , and  
C176 to the base of the post filter IF amplifier Q130 ( MMBC1321 ).  
Second Oscillator- Mixer- Limiter and FM Detector  
The output of IF amplifier Q130 is coupled through C182 to the input of IC109 (Pin16), an MC3371  
device. IC109 is a monolithic single-conversion FM receiver containing a mixer, the second local  
oscillator, limiter and quadrature detector. The second local oscillator is crystal-controlled by X101 and  
operates at 44.545 Mhz. Mixing the second L.O. with the 45.0 Mhz IF input signal provides a resultant 455  
kHz signal at the second mixer output. The mixer output is then routed to CF103 (455HT) for channel  
spacing of 12.5 kHz or to CF104 (455F) for channel spacing of 20 or 25kHz. These ceramic filters provide  
adjacent channel selectivity for the desired bandwidths. Selection of CF103 or CF104 is software controlled  
and programmable on a channel to channel basis.  
Filter selection is performed by Q135, D126 and D126. The selected filter output drives a high gain  
limiting amplifier that is internally coupled to the quadrature detector. Refering to the RF schematic, with  
Channel Spacing low, Q135 is off and CF104 is the selected filter.  
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THEORY OF OPERATION  
The quadrature detector is also configurable for narrow or wide channel spacing by software control of  
Q219 and diode D127. These components with R219 parallel R211 to maintain audio output at the proper  
level for the selected bandwidth.  
Q134 inserts wideband squelch adjustment RV102 into the circuit whenever standard filter CF104 is  
selected. This tends to broaden the filter response and provide the higher frequency noise components  
needed to activate the squelch.  
Squelch (Mute) Circuit  
The squelch output is sent to microcontroller pin 7 after processing by the squelch circuits. The squelch  
circuit consists of a double-tuned BPF (Band Pass Filter) and also a noise detector circuit. Details of these  
circuits are discussed next.  
Squelch Noise Band Pass Filter  
The output signal from pin 9 of IC109 (MC3371) is filtered to remove the 455 kHz IF variations. The  
remaining audio is then filtered by a double-tuned BPF consisting of resonator L228-C191, resonator  
L229-C193 and coupling capacitor C192. The noise in the IF passband is accepted and voice frequencies  
are rejected. Any noise present at the filter output is applied to the noise detector via RV103. RV103 is  
used to set the squelch circuit sensitivity and is normally adjusted to produce a noise squelch opening  
sensitivity of 10dB to 12dB SINAD.  
Noise Detector  
The noise detector operating in conjunction with IC109 consists of Q132, Q133, D125, D129, TH101 and  
their associated biasing components. Noise from RV103 is amplified by an op amp within IC109. This  
noise sprectrum is further amplified by Q133 and rectified by D125. This output is buffered by Q132 and  
fed to the SQ IN (IC109 pin 12) through R200. When the mute is activated, (IC109 pin9) goes low to pull  
the base of inverter Q131 low. Q131 collector goes high thereby signalling the microprocessor to mute the  
receiver audio.  
Low Pass Filter  
The audio output of (IC109 pin9) is fed to a LPF (Low Pass Filter) consisting of R206 and C201. This RC  
attenuates 455 kHz IF energy which normally appears at the output of the FM receiver chip. The audio is  
then routed to the input of IC406A LPF for audio processing.  
Speaker Audio Amplifier  
After signal detection and audio filtering, the low level audio is returned to pin 1 of IC108, the Audio PA.  
IC108, a TDA2003 device, provides sufficient power gain to drive the mobile speaker. Digital transistor  
Q137 mutes the audio amplifier by grounding R157 when the transistor turns on. When Q137 base is high,  
the transistor is on and the mobile is muted. Conversely when Q137 is off, the mute is released and audio is  
heard.  
Page-20-  
December 98  
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MAXON SM-2000 MOBILE  
TEST SETUP  
TEST SETUP  
TRANSMIT TESTS  
VARIABLE POWER  
SUPPLY WITH DC  
VOLT/CURRENT  
METER  
POWER  
METER  
FREQUENCY  
COUNTER  
DEVIATION  
METER  
SM-2000  
OSCILLOSCOPE  
TEST BOX  
DISTORTION  
ANALYZER  
DUMMY LOAD  
ATTENUATOR  
AUDIO  
GENERATOR  
RECEIVER TESTS  
COMMUNICATION  
MONITOR OR  
FM SIGNAL  
SINAD  
METER  
OSCILLOSCOPE  
GENERATOR  
SM-2000  
VARIABLE  
POWER  
SUPPLY  
AC  
VTVM  
DISTORTION  
ANALYZER  
PAD  
Page-21-  
December 98  
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MAXON SM-2000 MOBILE  
SM-2150/VHF ALIGNMENT PROCEDURE  
SM-2150/VHF ALIGNMENT PROCEDURE  
It is important that the TCXO be on the correct frequency before performing a complete alignment of the  
radio. An incorrect TCXO frequency can impair the performance and even cause mis-alignments.  
Normally the transmitter is monitored with a frequency counter or service monitor while the transmitter is  
keyed at it’s highest frequency. The TCXO is adjusted for the least frequency error. Typically the  
frequency is 470MHz with a frequency error of +/-750Hz or less. TC701 adjusts the center frequency if  
necessary.  
PLL Alignment  
•
NOTE: If the PLL is out- of- lock, an audible warning will be heard and the front panel red  
LED will flash.  
1. Connect an RF power meter to the ANT socket.  
2. Using the channel switch, select channel with the lowest transmit frequency.  
3. Connect a DC voltmeter to test point 1 (TP1) accessed via the hole in the VCO cover.  
4. Set the PTT switch to transmit.  
•
Note:The transmitter switching band width of this radio is 25MHz. A transmitter frequency  
range of more than 26MHz may be programmed and used if the voltage specification in step 5 is  
met.  
5. Adjusting L353, set the voltage measured at TP1, measure and check that the voltage is above 2.1  
volts. If the voltage is below 2.1 volts the transmitter frequency programmed is too high for the  
operating bandwidth of the radio.  
6. Set the PTT switch to receive.  
7. Using the channel switch select channel with the lowest receive frequency.  
8. Adjusting L356, set the voltage measured at TP1. Measure and check that the voltage is above 1.5  
volts. If the voltage is below 1.5 volts the receive frequency programmed is too high for the  
operating bandwidth of the radio.  
•
Note:The receiver switching bandwidth of this radio is 26MHz. A receiver frequency range of  
more than 26MHz may be programmed and used if the voltage specification in Step 8 is met.  
There may be some degradation in actual receiver performance, if bandwidth of more than  
26MHz is used.  
Page-22-  
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MAXON SM-2000 MOBILE  
SM-2150/VHF ALIGNMENT PROCEDURE  
Receiver Alignment RF  
•
NOTE: The Receiver front end is a pre-aligned module. There are no available field  
adjustments.  
1. Connect an RF signal generator to the ANT socket and a SINAD meter to the external speaker  
jack ( J1 ) located at the rear panel.  
2. Adjust RV103 to the fully open position to hear receiver noise.  
3. Adjust the VOLUME control to mid position.  
4. Using the channel switch, select the programmed middle receive frequency.  
5. Set the RF signal generator to the same receive channel frequency.  
6. Set the audio frequency to 1kHz at 3K deviation for wide band (25kHz).  
6B. Set the audio frequency to 1kHz at 1.5K deviation for narrow band (12.5kHz).  
7. Adjust the RF output voltage level of the RF signal generator until the 1kHz signal is heard.  
• NOTE: The RF output voltage level and the SINAD reading.  
8. Adjust T102 for an improvement in SINAD.  
9. Adjust the RF output voltage level of the RF signal generator keeping the SINAD meter readings  
between 6dB and 12dB.  
10. Adjust T101 for an improvement in SINAD.  
11. Adjust the RF output voltage level of the RF signal generator keeping the SINAD meter readings  
between 6dB and 12dB .  
12. Check for an RF voltage signal level of 0.31uV and a SINAD meter reading of 12dB or greater.  
13. Select the highest receive frequency and check for a SINAD meter reading of 12dB or greater, at  
0.42uV . (Sensitivity at the operational band edge).  
14. Select the lowest receive frequency and check for a SINAD meter reading of 12dB or greater, at  
0.42uV.  
Discriminator Tuning  
1. Set the RF level to 1.0mV .  
2. Adjust T103 for a maximum audio output and on the oscilloscope monitor the sinewave distortion.  
Adjust T101 and T102 for lowest distortion as observed on a distortion analyzer. This is normally  
less than 3%.  
Page-23-  
December 98  
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MAXON SM-2000 MOBILE  
SM-2150/VHF ALIGNMENT PROCEDURE  
Squelch Adjustment  
1. Select a receiver channel that is programmed for narrow band (12.5 kHz) operation.  
2. Set the RF signal generator to the receiver frequency. Set the AF modulation signal to 1 kHz at  
1.5k deviation.  
3. Adjust the RF output level of the RF signal generator until the 1 kHz signal is heard.  
4. Adjust the RF signal to the level desired for squelch sensitivity as you monitor SINAD. This is  
usually 8dB to 12dB SINAD.  
5. On the main board adjust RV103 until the squelch is just unmuted (open)  
6. Switch off the RF generator (squelch should close).  
7. Switch on the RF generator. Squelch should open at the SINAD point where RV103 was adjusted.  
This completes the narrow band adjustment.  
8. Select a receiver channel that is programmed for wide band operation (25 kHz).  
9. Set the RF signal generator to the receiver frequency. Set the AF modulation signal to 1 kHz at 3k  
deviation.  
10. Adjust the RF output level of the RF signal generator until the 1 kHz signal is heard.  
11. Adjust the RF signal to the level desired for squelch sensitivity as you monitor SINAD. This is  
usually 8dB to 12dB SINAD.  
12. On the main board adjust RV102 until the squelch is just unmuted (open).  
13. Switch off the RF generator (squelch should close).  
14. Switch on the RF generator. Squelch should open at the SINAD point where RV102 was  
adjusted.  
15. Disconnect the test equipment.  
Automatic Power Adjustment  
• Continuous transmit periods longer than 5 minutes are to be avoided.  
1. Connect the antenna output to a RF power meter or service monitor.  
2. Set the PTT switch to the ON position.  
3. Adjust the variable resistor RV104 to give the appropriate transmit power. Normally this is  
25watts.  
4. Set the PTT switch to the OFF position.  
5. Select a channel programmed to low transmit power.  
6. Set PTT to ON and adjust RV105 for desired low power.  
7. Set PTT to OFF.  
Page-24-  
December 98  
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MAXON SM-2000 MOBILE  
SM-2150/VHF ALIGNMENT PROCEDURE  
CTCSS/DCS Deviation Adjustment  
•
Note:The following adjustment should be preset with factory alignment. If an adjustment must  
be made the following procedures must be followed:  
1. Program the radio with a 67.0Hz tone on one channel and 250.3Hz on another channel.  
2. Connect a power meter and modulation meter to the radio antenna jack.  
3. Adjust RV101 to the center of its adjustment.  
•
Note:Release the PTT button when changing channels.  
4. Alternately select the channel with tone 250.3Hz and the channel with tone 67Hz. Key up and  
note the level for each. If necessary, adjust RV101 until a balance occurs between tone 250.3Hz  
and tone 67Hz.  
• Note:This adjustment also sets DCS balance even if a DCS tone is not programmed at this time.  
5. Select tone 250.3Hz or tone 67Hz and adjust RV403 for the tone level, typically between 500Hz  
to 1kHz.  
6. Release the PTT button.  
Modulation Deviation Adjustment  
1. Connect a power meter and a coupler to the radio.  
2. Connect an AF generator to the test box.  
3. Set the audio output to 30mV and the audio frequency to 1kHz .  
4. Using the channel switch, select the highest transmit channel that does not have CTCSS or DCS  
programmed.  
5. Press and hold the PTT switch.  
6. Adjust RV402 for 90% of maximum, system deviation.  
6a. Adjust RV402 for 2.25kHz for narrow band (12.5kHz).  
6b. Adjust RV402 for 4.5kHz for wide band (25kHz).  
7. Using the channel switch, select the lowest transmit channel that does not have CTCSS or DCS  
programmed.  
8. Press and hold the PTT switch.  
9. Measure and check that the deviation is not below 3.8k . If the deviation is below 3.8k, adjust  
RV402 to 3.8k .  
10. Return to highest transmit channel having a sub- audible tone and verify deviation does not exceed  
5k.  
11. At the channel that highest deviation is found, sweep the audio frequency between 300kHz and  
3kHz . Adjust RV402 to ensure deviation is below peak system deviation at all frequencies.  
12. Set the PTT switch to the OFF position.  
Page-25-  
December 98  
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MAXON SM-2000 MOBILE  
ALIGNMENT POINTS DIAGRAM (SM-2150/VHF)  
ALIGNMENT POINTS DIAGRAM (SM-2150/VHF)  
RV103  
SQUELCH 12.5 KHz CH/SP  
RV105  
TX LOW POWER  
RV104  
TX HI POWER  
T103  
DISCRIMINATOR  
ANT  
RV102  
SQUELCH 25 KHz CH/SP  
T101  
T102  
L356  
L353  
RV101  
CTCSS  
TC701  
TP1  
TCXO1  
RV403  
DCS  
RV402  
MODULATION  
Page-26-  
December 98  
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MAXON SM-2000 MOBILE  
SM-2450/UHF ALIGNMENT PROCEDURE  
SM-2450/UHF ALIGNMENT PROCEDURE  
It is important that the TCXO be on the correct frequency before performing a complete alignment of the  
radio. An incorrect TCXO frequency can impair the performance and even cause mis-alignments.  
Normally the transmitter is monitored with a frequency counter or service monitor while the transmitter is  
keyed at its highest frequency. The TCXO is adjusted for the least frequency error. Typically the frequency  
is 470MHz with a frequency error of +/- 750Hz or less. TC701 adjusts the center frequency if necessary.  
PLL Alignment  
•
NOTE: If the PLL is out- of- lock, an audible warning will be heard and the front panel red  
LED will flash.  
1. Connect an RF power meter to the ANT jack.  
2. Using the channel switch, select the channel with the highest transmit frequency.  
3. Connect a DC voltmeter to test point 1 ( TP1 ), accessed via the hole in the VCO cover.  
4. Set the PTT switch to transmit.  
5. Adjusting TC101 , set the voltage measured at TP1 to 12.0 (+/- 0.05) volts.  
6. Release the PTT switch.  
7. Using the channel switch, select the channel with the lowest receive frequency.  
8. At TP1 measure and check that the voltage is 1.4 volts or more. If the voltage is below 1.4 volts  
the VCO may not lock because the lowest RX frequency is programmed too far below the TX  
frequency.  
Receiver Alignment RF  
•
NOTE: The Receiver front end is a pre-aligned module. There are no available field  
adjustments.  
1. Connect an RF signal generator to the ANT socket and a SINAD meter to the external speaker  
jack ( J1 ) located at the rear panel.  
2. Adjust RV103 to the fully open position to hear receiver noise.  
3. Adjust the VOLUME control to mid position.  
4. Using the channel switch, select the programmed middle receive frequency.  
5. Set the RF signal generator to the same receive channel frequency.  
6. Set the audio frequency to 1kHz at 3K deviation for wide band (25kHz).  
6B. Set the audio frequency to 1kHz at 1.5K deviation for narrow band (12.5kHz).  
7. Adjust the RF output voltage level of the RF signal generator until the 1kHz signal is heard.  
• NOTE: The RF output voltage level and the SINAD reading.  
8. Adjust T102 for an improvement in SINAD.  
9. Adjust the RF output voltage level of the RF signal generator keeping the SINAD meter readings  
between 6dB and 12dB .  
10. Adjust T101 for an improvement in SINAD.  
Page-27-  
December 98  
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MAXON SM-2000 MOBILE  
SM-2450/UHF ALIGNMENT PROCEDURE  
11. Adjust the RF output voltage level of the RF signal generator keeping the SINAD meter readings  
between 6dB and 12dB .  
12. Check for an RF voltage signal level of 0.31uV and a SINAD meter reading of 12dB or greater.  
13. Select the highest receive frequency and check for a SINAD meter reading of 12dB or greater, at  
0.42uV . (Sensitivity at the operational band edge).  
14. Select the lowest receive frequency and check for a SINAD meter reading of 12dB or greater, at  
0.42uV.  
Discriminator Tuning  
1. Set the RF level to 1.0mV .  
2. Adjust T103 for a maximum audio output and on the oscilloscope monitor the sinewave distortion.  
Adjust T101 and T102 for lowest distortion as observed on a distortion analyzer. This is normally  
less than 3%.  
Squelch Adjustment  
1. Select a receiver channel that is programmed for narrow band (12.5 kHz) operation.  
2. Set the RF signal generator to the receiver frequency. Set the AF modulation signal to 1 kHz at  
1.5k deviation.  
3. Adjust the RF output level of the RF signal generator until the 1 kHz signal is heard.  
4. Adjust the RF signal to the level desired for squelch sensitivity as you monitor SINAD. This is  
usually 8dB to 12dB SINAD.  
5. On the main board adjust RV103 until the squelch is just unmuted (open)  
6. Switch off the RF generator (squelch should close).  
7. Switch on the RF generator. Squelch should open at the SINAD point where RV103 was adjusted.  
This completes the narrow band adjustment.  
8. Select a receiver channel that is programmed for wide band operation (25 kHz).  
9. Set the RF signal generator to the receiver frequency. Set the AF modulation signal to 1 kHz at 3k  
deviation.  
10. Adjust the RF output level of the RF signal generator until the 1 kHz signal is heard.  
11. Adjust the RF signal to the level desired for squelch sensitivity as you monitor SINAD. This is  
usually 8dB to 12dB SINAD.  
12. On the main board adjust RV102 until the squelch is just unmuted (open).  
13. Switch off the RF generator (squelch should close).  
14. Switch on the RF generator. Squelch should open at the SINAD point where RV102 was  
adjusted.  
15. Disconnect the test equipment.  
Page-28-  
December 98  
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MAXON SM-2000 MOBILE  
SM-2450/UHF ALIGNMENT PROCEDURE  
Automatic Power Adjustment  
• NOTE: Continuous transmit periods longer than 5 minutes are to be avoided.  
1. Connect the antenna output to an RF power meter or service monitor.  
2. Set the PTT switch to the ON position.  
3. Adjust the Variable resistor RV104 to give the appropriate transmit power. Nominally this is  
25watts .  
4. Set the PTT switch to the OFF position.  
5. Select a channel programmed to low transmit power.  
6. Set PTT to ON and adjust RV105 for desired low power .  
7. Set PTT to OFF.  
CTCSS/DCS Deviation Adjustment  
•
NOTE: The following adjustment should be preset with factory alignment. If an adjustment  
must be made the following procedures must be followed:  
1. Program the radio with a 67.0Hz tone on one channel and 250.3Hz on another channel.  
2. Connect a power meter and modulation meter to the radio antenna jack.  
3. Adjust RV101 to the center of its adjustment.  
•
Note: Release the PTT button when changing channels.  
4. Alternately select the channel with tone 250.3Hz and the channel with tone 67Hz . Key up and  
note the level for each. If necessary, adjust RV101 until a balance occurs between tone 250.3Hz  
and tone 67Hz .  
• Note:This adjustment also sets DCS balance even if a DCS tone is not programmed at this time.  
5. Select tone 250.3Hz or tone 67Hz and adjust RV403 for the tone level, typically between 500Hz  
to 1kHz.  
6. Release the PTT button.  
Page-29-  
December 98  
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MAXON SM-2000 MOBILE  
SM-2450/UHF ALIGNMENT PROCEDURE  
Modulation Deviation Adjustment  
1. Connect a power meter and a coupler to the radio.  
2. Connect an AF generator to the test box.  
3. Set the audio output to 30mV and the audio frequency to 1kHz .  
4. Using the channel switch, select the highest transmit channel that does not have CTCSS or DCS  
programmed.  
5. Press and hold the PTT switch.  
6. Adjust RV402 for 90% of maximum, system deviation.  
6a. Adjust RV402 for 2.25kHz for narrow band (12.5kHz).  
6b. Adjust RV402 for 4.5kHz for wide band (25kHz).  
7. Using the channel switch, select the lowest transmit channel that does not have CTCSS or DCS  
programmed.  
8. Press and hold the PTT switch.  
9. Measure and check that the deviation is not below 3.8k . If the deviation is below 3.8k, adjust  
RV402 to 3.8k .  
10. Return to highest transmit channel having a sub- audible tone and verify deviation does not exceed  
5k.  
11. At the channel that highest deviation is found, sweep the audio frequency between 300kHz and  
3kHz . Adjust RV402 to ensure deviation is below peak system deviation at all frequencies.  
12. Set the PTT switch to the OFF position.  
Page-30-  
December 98  
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MAXON SM-2000 MOBILE  
ALIGNMENT POINTS DIAGRAM (SM-2450/UHF)  
ALIGNMENT POINTS DIAGRAM (SM-2450/UHF)  
TX HI PWR  
RV103  
RV104  
SQUELCH 12.5 kHz CH/SP  
T103  
DISCRIMINATOR  
RV105  
TX LO PWR  
SQUELCH 25 kHz CH/SP  
RV102  
T101  
T102  
TC101  
CNTR FREQ  
TP1  
RV101  
TC701  
CTCSS  
DCS  
RV403  
RV402  
TX DEVIATION  
J1  
Page-31-  
December 98  
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MAXON SM-2000 MOBILE  
COMPONENT REPLACEMENT  
COMPONENT REPLACEMENT  
SURFACE MOUNT COMPONENTS  
Surface mount components should always be replaced using a temperature controlled soldering system.  
The soldering tools may be either a temperature controlled soldering iron or a temperature controlled  
hot-air soldering station. A hot-air system is recommended for the removal of components on these boards.  
With either soldering system, a temperature of 700° F (371° C) should be maintained.  
The following procedures outline the removal and replacement of surface mount components. If a hot-air  
soldering system is employed, see the manufacturer’s operating instructions for detailed information on the  
use of your system.  
•
CAUTION: Avoid applying heat to the body of any surface mount component using standard  
soldering methods. Heat should be applied only to the metalized terminals of the components.  
Hot-air systems do not damage the components since the heat is quickly and evenly distributed to  
the external surface of the component.  
•
CAUTION: The CMOS Integrated Circuit devices used in this equipment can be destroyed by  
static discharges. Before handling one of these devices, service technicians should discharge  
themselves by touching the case of a bench test instrument that has a 3-prong power cord  
connected to an outlet with a known good earth ground. When soldering or desoldering a CMOS  
device, the soldering equipment should have a known good earth ground.  
SURFACE MOUNT REMOVAL  
1. Grip the component with tweezers or small needle nose pliers.  
2. Alternately heat the metalized terminal ends of the surface mount component with the soldering iron. If  
a hot-air system is used, direct the heat to the terminals of the component. Use extreme care with the  
soldering equipment to prevent damage to the printed circuit board (PCB) and the surrounding  
components.  
3. When the solder on all terminals is liquefied, gently remove the component. Excessive force may  
cause the PCB pads to separate from the board if all solder is not completely liquefied.  
4. It may be necessary to remove excess solder using a vacuum de-soldering tool or Solder wick . Again,  
use great care when de-soldering or soldering on the printed circuit boards. It may also be necessary to  
remove the epoxy adhesive that was under the surface mount component and any flux on the printed  
circuit board.  
Page-32-  
December 98  
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MAXON SM-2000 MOBILE  
COMPONENT REPLACEMENT  
SURFACE MOUNT COMPONENT REPLACEMENT  
1. “Tin” one terminal end of the new component and the corresponding pad of the PCB. Use as little  
solder as possible.  
2. Place the component on the PCB pads, observing proper polarity for capacitors, diodes, transistors, etc.  
3. Simultaneously touch the “tinned” terminal end and the “tinned” pad with the soldering iron. Slightly  
press the component down on the board as the solder liquefies. Solder all terminals, allowing the  
component time to cool between each application of heat. Do not apply heat for an excessive length of  
time and do not use excessive solder.  
With a hot-air system, apply hot air until all “tinned” areas are melted and the component is seated in place.  
It may be necessary to slightly press the component down on the board. Touch-up the soldered connections  
with a standard soldering iron if needed. Do not use excessive solder.  
•
CAUTION: Some chemicals may damage the internal and external plastic parts of the radio.  
4. Allow the component and the board to cool and then remove all flux from the area using alcohol or  
another approved flux remover.  
SURFACE MOUNTED INTEGRATED CIRCUIT REPLACEMENT  
Soldering and de-soldering techniques of the surface mounted IC’s are similar to the above outlined  
procedures for the surface mounted chip components. Use extreme care and observe static precautions  
when removing or replacing the defective (or suspect) IC’s. This will prevent any damage to the printed  
circuit board or the surrounding circuitry.  
The hot-air soldering system is the best method of replacing surface mount IC’s. The IC’s can easily be  
removed and installed using the hot-air system. See the manufacturer’s instructions for complete details on  
tip selection and other operating instructions unique to your system.  
If a hot-air system is not available, the service technician may wish to clip the pins near the body of the  
defective IC and remove it. The pins can then be removed from the PCB with a standard soldering iron and  
tweezers, and the new IC installed following the Surface Mount Component Replacement procedures. it  
may not be necessary to “tin” all (or any) of the IC pins before the installation process.  
Page-33-  
December 98  
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MAXON SM-2000 MOBILE  
PARTS LIST COMMON TO SM-2000  
PARTS LIST COMMON TO SM-2000  
REF #  
DESCRIPTION  
PART #  
REF #  
DESCRIPTION  
PART #  
650-100-0002 TCXO PCB ASSY. (SEE NOTE 1)  
650-090-0003 MA-4472 MIC ASSY. (SEE NOTE 1)  
650-050-0003 CONTROL HEAD PCB ASSY.  
CON1  
HEADER PIN  
Z422-492-1  
420-709-9  
CON801 JACK MODULAR  
C801  
C802  
C803  
C804  
C805  
C806  
C807  
C808  
C809  
C815  
C821  
C823  
D801  
D802  
D803  
D804  
D807  
D808  
D810  
D811  
LED1  
LED2  
LED3  
LED4  
LED5  
Q821  
Q822  
R801  
R821  
R822  
SP1  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
47PF  
47PF  
47PF  
47PF  
47PF  
47PF  
47PF  
47PF  
47PF  
134-722-1Z  
134-722-1Z  
134-722-1Z  
134-722-1Z  
134-722-1Z  
134-722-1Z  
134-722-1Z  
134-722-1Z  
134-722-1Z  
DISK CERAMIC (FOR SP1) 470PF 134-710-8  
CHIP CERAMIC 0.001UF  
ELECT CAPACITOR 10UF  
130-A17-6Z  
101-025-9  
243-052-6  
243-052-6  
243-052-6  
243-051-5  
241-099-9  
241-099-9  
241-099-9  
241-099-9  
251-160-3  
251-160-3  
251-160-3  
251-160-3  
251-168-1  
202-106-5  
202-106-5  
060-471-0Z  
060-220-0Z  
060-472-1Z  
420-108-4A  
432-063-7  
436-038-8  
430-070-5  
450-523-5  
892-390  
DIODE SI CHIP  
DIODE SI CHIP  
DIODE SI CHIP  
DIODE SI CHIP  
DIODE ZENER  
DIODE ZENER  
DIODE ZENER  
DIODE ZENER  
KDS193  
KDS193  
KDS193  
KDS184S  
LED LAMP GRN 3 V 75MW  
LED LAMP GRN 3 V 75MW  
LED LAMP GRN 3 V 75MW  
LED LAMP GRN 3 V 75MW  
LED LAMP RED/GRN 3 V  
TRANSISTOR  
TRANSISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
SPEAKER  
470 OHM  
22 OHM  
4.7K  
4 OHM  
SW3  
SW PUSH  
SW4  
TACT SWITCH  
SW ROTARY  
SW405  
VR801  
VR  
20KA  
HOLDER(LED)  
HOLDER(LED)  
892-540  
P.C.B. CONTROL HEAD  
416-988-C  
NOTES:  
1. Components are not available, assembly is non-repairable.  
Page-34-  
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MAXON SM-2000 MOBILE  
650-000-0001 SM-2150/VHF MAIN BOARD  
650-000-0001 SM-2150/VHF MAIN BOARD  
DIGITAL SECTION  
Digital Parts Common on Both VHF & UHF  
REF #  
C401  
DESCRIPTION  
PART #  
130-A17-6Z  
REF #  
C450  
DESCRIPTION  
0.047UF  
PART #  
130-424-0Z  
CHIP CERAMIC  
0.001UF  
0.22UF  
0.01UF  
CHIP CERAMIC  
C402  
C403  
C404  
C405  
C406  
C407  
C408  
C409  
C410  
C411  
C412  
C413  
C414  
C415  
C416  
C417  
C418  
C419  
C420  
C421  
C422  
C423  
C424  
C425  
C426  
C428  
C429  
C430  
C431  
C432  
C433  
C434  
C435  
C436  
C437  
C438  
C440  
C441  
C442  
C443  
C445  
C446  
C447  
C448  
CHIP CERAMIC  
CHIP CERAMIC  
130-270-7Y  
130-172-2Z  
101-025-9  
C452  
C453  
C454  
C455  
C456  
C457  
C458  
C460  
C464  
C550  
C551  
C552  
C553  
C554  
C555  
C558  
C559  
CHIP TANTALUM  
CHIP CERAMIC  
CHIP TANTALUM  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
1UF  
141-036-1Z  
130-172-2Z  
141-036-1Z  
130-314-5Z  
130-A17-6Z  
130-424-0Z  
130-172-2Z  
130-170-0Y  
130-314-5Z  
131-816-6Z  
131-816-6Z  
130-172-2Z  
130-172-2Z  
130-172-2Z  
130-172-2Z  
101-025-9  
130-172-2Z  
421-677-7  
422-746-1  
243-051-5  
243-063-6  
243-049-4  
243-049-4  
223-224-9  
220-378-0  
222-018-5  
231-064-4  
222-018-5  
231-073-3  
229-463-8A  
220-130-2  
222-018-5  
223-261-2  
223-261-2  
202-095-8Z  
202-095-8Z  
202-095-8Z  
202-095-8Z  
202-095-8Z  
202-095-8Z  
202-095-8Z  
202-091-4  
202-095-8Z  
202-106-5  
0.01UF  
1UF  
ELECT CAPACITOR 10UF  
CHIP CERAMIC  
CHIP CERAMIC  
220PF  
220PF  
132-220-2Z  
132-220-2Z  
101-025-9  
0.033UF  
0.001UF  
0.047UF  
0.01UF  
0.1UF  
ELECT CAPACITOR 10UF  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
0.033UF  
0.0068UF  
47PF  
130-314-5Z  
130-602-4Y  
134-722-1Z  
130-170-0Y  
130-A44-0Y  
134-722-1Z  
130-424-0Z  
132-220-2Z  
130-172-2Z  
134-719-7Z  
130-263-1Z  
130-A22-0Z  
134-761-4Z  
134-761-4Z  
132-220-2Z  
132-220-2Z  
132-220-2Z  
130-A60-4Y  
130-263-1Z  
130-172-2Z  
134-722-1Z  
130-A60-4Y  
130-315-6Z  
130-624-4  
0.033UF  
18PF  
0.1UF  
0.015UF  
47PF  
18PF  
0.01UF  
0.01UF  
0.01UF  
0.01UF  
0.047UF  
220PF  
0.01UF  
0.0047UF  
0.022UF  
0.0018UF  
470PF  
ELECT CAPACITOR 10UF  
CHIP CERAMIC 0.01UF  
CON403 PROG CONNECTOR  
CON404 OPTION BOARD CONNECTOR  
470PF  
D401  
D402  
D551  
D552  
IC401  
IC402  
IC404  
IC405  
IC406  
IC407  
IC408  
IC409  
IC410  
IC411  
IC412  
Q131  
Q401  
Q402  
Q403  
Q404  
Q405  
Q406  
Q407  
Q409  
Q504  
DIODE SI CHIP  
DIODE SWITCHING  
DIODE SI CHIP  
DIODE SI CHIP  
I.C.  
220PF  
220PF  
220PF  
0.1UF  
0.022UF  
0.01UF  
47PF  
I.C. REGULATOR  
I.C. OP AMP  
I.C. OP AMP  
I.C. OP AMP  
I.C.  
0.1UF  
0.0033UF  
0.68UF  
0.082UF  
120PF  
I.C. EEPROM  
I.C.  
130-808-4Y  
131-107-9Z  
101-006-2  
I.C. OP AMP  
I.C.  
ELECT CAPACITOR 1UF  
CHIP CERAMIC  
CHIP CERAMIC  
0.1UF  
0.1UF  
130-170-0Y  
130-A60-4Y  
101-025-9  
I.C.  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
BRT  
ELECT CAPACITOR 10UF  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
15PF  
131-511-0Z  
131-511-0Z  
130-424-0Z  
130-424-0Z  
130-314-5Z  
130-314-5Z  
130-314-5Z  
130-314-5Z  
15PF  
0.047UF  
0.047UF  
0.033UF  
0.033UF  
0.033UF  
0.033UF  
TRANSISTOR  
TRANSISTOR  
Page-35-  
December 98  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MAXON SM-2000 MOBILE  
650-000-0001 SM-2150/VHF MAIN BOARD  
DIGITAL SECTION (continued)  
Digital Parts Common on Both VHF & UHF  
REF #  
Q550  
DESCRIPTION  
TRANSISTOR  
PART #  
202-113-1  
REF #  
R447  
DESCRIPTION  
PART #  
060-124-6Z  
CHIP RESISTOR  
120K  
220K  
820  
22K  
2.2K  
1M  
Q551  
Q552  
Q553  
R186  
R401  
R402  
R403  
R404  
R405  
R406  
R407  
R408  
R410  
R411  
R412  
R414  
R415  
R416  
R417  
R418  
R419  
R420  
R421  
R422  
R423  
R424  
R425  
R426  
R427  
R428  
R429  
R430  
R431  
R433  
R434  
R435  
R436  
R437  
R438  
R439  
R440  
R441  
R442  
R443  
R444  
R445  
R446  
TRANSISTOR  
202-113-1  
R448  
R449  
R450  
R451  
R452  
R453  
R454  
R455  
R456  
R457  
R458  
R459  
R460  
R461  
R462  
R463  
R464  
R465  
R466  
R469  
R470  
R471  
R472  
R473  
R474  
R490  
R550  
R551  
R552  
R553  
R554  
R555  
R556  
R559  
RLK3  
RLK4  
RLK5  
RLK7  
RLK8  
RLK10  
RLK11  
RLK12  
RLK13  
RLK14  
RV402  
RV403  
X401  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
060-224-4Z  
060-821-3Z  
060-223-3Z  
060-222-2Z  
060-105-0Z  
060-302-1Z  
060-472-1Z  
060-362-5Z  
060-273-8Z  
060-473-2Z  
060-473-2Z  
060-242-0  
TRANSISTOR  
202-113-1  
TRANSISTOR  
202-113-1  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
47K  
680K  
47K  
10K  
56K  
7.5K  
18K  
330K  
3.3K  
220K  
100K  
39K  
8.2K  
8.2K  
220K  
8.2K  
8.2K  
47K  
10K  
10K  
43K  
47K  
560  
060-473-2Z  
060-684-6Z  
060-473-2Z  
060-103-8Z  
060-563-0Z  
060-752-4Z  
060-183-0Z  
060-334-0Z  
060-332-8Z  
060-224-4Z  
060-104-9Z  
060-393-3Z  
060-822-4Z  
060-822-4Z  
060-224-4Z  
060-822-4Z  
060-822-4Z  
060-473-2Z  
060-103-8Z  
060-103-8Z  
060-433-6Z  
060-473-2Z  
060-561-8Z  
060-103-8Z  
060-473-2Z  
060-393-3Z  
060-203-5Z  
060-104-9Z  
060-103-8Z  
060-223-3Z  
060-473-2Z  
060-473-2Z  
060-473-2Z  
060-223-3Z  
060-472-1Z  
060-472-1Z  
060-473-2Z  
060-105-0Z  
060-433-6Z  
060-333-9Z  
060-203-5Z  
060-224-4Z  
060-124-6Z  
060-823-5Z  
3K  
4.7K  
3.6K  
27K  
47K  
47K  
2.4K  
470  
470  
47K  
47K  
47K  
47K  
100K  
10K  
30K  
36K  
30K  
4.7K  
360K  
47K  
7.5K  
27K  
27K  
7.5K  
2.2K  
4.7K  
2.2K  
470  
0
060-471-0Z  
060-471-0Z  
060-473-2Z  
060-473-2Z  
060-473-2Z  
060-473-2Z  
060-104-9Z  
060-103-8Z  
060-303-2Z  
060-363-6Z  
060-303-2Z  
060-472-1Z  
060-364-7  
060-473-2Z  
060-752-4Z  
060-273-8Z  
060-273-8Z  
060-752-4Z  
060-222-2Z  
060-472-1Z  
060-222-2Z  
060-471-0Z  
060-000-8Z  
060-000-8Z  
060-000-8Z  
060-000-8Z  
060-000-8Z  
060-000-8Z  
060-000-8Z  
060-000-8Z  
060-000-8Z  
060-000-8Z  
067-223-8Y  
067-473-7Y  
262-228-0Z  
10K  
47K  
39K  
20K  
100K  
10K  
22K  
47K  
47K  
47K  
22K  
4.7K  
4.7K  
47K  
1M  
0
0
0
0
0
0
43K  
33K  
20K  
220K  
120K  
82K  
0
0
0
RES.CHIP SEMIFIXED 22K  
RES.CHIP SEMIFIXED 47K  
CRYSTAL  
Page-36-  
December 98  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MAXON SM-2000 MOBILE  
650-000-0001 SM-2150/VHF MAIN BOARD  
BAND CHART  
SM-2150L VHF BAND 1 (136-162 MHz)  
SM-2150H VHF BAND 2 (148-174 MHz)  
REF #  
DESCRIPTION  
PART #  
REF #  
DESCRIPTION  
PART #  
FRONT-END PCB ASSEMBLY  
650-110-0011  
FRONT-END PCB ASSEMBLY  
650-110-0002  
MAIN BOARD PARTS  
MAIN BOARD PARTS  
C155  
C160  
C164  
C165  
C245  
C248  
C249  
C253  
C254  
C269  
C270  
C273  
C275  
C277  
C278  
C280  
C281  
C283  
C354  
C356  
C357  
C358  
C365  
C367  
C368  
L353  
L356  
R182  
CHIP CERAMIC 4PF  
CHIP CERAMIC 24PF  
CHIP CERAMIC 18pF  
CHIP CERAMIC 9pF  
CHIP CERAMIC 5PF  
CHIP CERAMIC 27PF  
CHIP CERAMIC 20PF  
CHIP CERAMIC 75PF  
CHIP CERAMIC 33PF  
CHIP CERAMIC 9PF  
CHIP CERAMIC 4PF  
CHIP CERAMIC 43PF  
CHIP CERAMIC 47PF  
CHIP CERAMIC 43PF  
CHIP CERAMIC 82PF  
CHIP CERAMIC 24PF  
CHIP CERAMIC 36pF  
CHIP CERAMIC 18PF  
CHIP CERAMIC 39PF  
CHIP CERAMIC 4PF  
CHIP CERAMIC 4.7PF  
CHIP CERAMIC 4.7PF  
CHIP CERAMIC 16PF  
CHIP CERAMIC 3.3PF  
CHIP CERAMIC 3.3PF  
COIL CORE CHIP  
134-007-7Y  
132-407-5Y  
131-816-6Y  
139-003-8Y  
135-010-4Y  
132-714-2Y  
132-012-1Y  
137-504-4Y  
133-336-9Y  
139-003-8Y  
134-013-2Y  
134-302-2Y  
134-773-5Y  
134-302-2Y  
138-216-9Z  
132-408-6Y  
133-611-7Y  
131-829-8Y  
133-932-7Y  
134-007-7Y  
134-767-0Y  
134-767-0Y  
131-603-0  
C155  
C160  
C164  
C165  
C245  
C248  
C249  
C253  
C254  
C269  
C270  
C273  
C275  
C277  
C278  
C280  
C281  
C283  
C354  
C356  
C357  
C358  
C365  
C367  
C368  
L353  
L356  
R182  
CHIP CERAMIC 11PF  
CHIP CERAMIC 24PF  
CHIP CERAMIC 24PF  
CHIP CERAMIC 16PF  
CHIP CERAMIC 8PF  
CHIP CERAMIC 27PF  
CHIP CERAMIC 18PF  
CHIP CERAMIC 75PF  
CHIP CERAMIC 43PF  
CHIP CERAMIC 2.7PF  
CHIP CERAMIC 6PF  
CHIP CERAMIC 51PF  
CHIP CERAMIC 56PF  
CHIP CERAMIC 47PF  
CHIP CERAMIC 75PF  
CHIP CERAMIC 20PF  
CHIP CERAMIC 56PF  
CHIP CERAMIC 27PF  
CHIP CERAMIC 30PF  
NOT USED  
131-103-5Y  
132-407-5Y  
132-407-5Y  
131-603-0  
138-004-4Y  
132-714-2Y  
131-816-6Y  
137-504-4Y  
134-302-2Y  
132-725-2Y  
136-015-4Y  
135-106-8Y  
135-639-1Y  
134-773-5Y  
137-512-1Z  
132-021-9  
135-613-9Y  
132-723-0Y  
133-010-4Y  
NOT USED  
135-627-2Y  
135-627-2Y  
131-816-6Y  
134-767-0Y  
134-767-0Y  
320-859-9  
CHIP CERAMIC 5.6PF  
CHIP CERAMIC 5.6PF  
CHIP CERAMIC 18PF  
CHIP CERAMIC 4.7PF  
CHIP CERAMIC 4.7PF  
COIL CORE CHIP  
133-321-5Y  
133-321-5Y  
311-117-4  
COIL CORE CHIP  
311-117-4  
COIL CORE CHIP  
311-117-4  
CHIP RESISTOR 120 OHM  
060-121-4Z  
CHIP RESISTOR 150 OHM  
060-151-1Z  
650-XXX-XXXX FRONT END ASSY.  
Page-37-  
December 98  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MAXON SM-2000 MOBILE  
650-000-0001 SM-2150/VHF MAIN BOARD  
REF #  
FRONT-END PCB ASSEMBLY (REFER TO BAND CHART)  
DESCRIPTION  
PART #  
REF #  
C183  
DESCRIPTION  
47PF  
PART #  
134-722-1Y  
CHIP CERAMIC  
C1  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP TANTALUM  
470PF  
220PF  
220PF  
220PF  
220PF  
5PF  
134-761-4Y  
132-220-2Y  
132-220-2Y  
132-220-2Y  
132-220-2Y  
135-010-4Y  
134-761-4Y  
130-170-0Y  
131-089-7Y  
132-220-2Y  
130-A17-6Y  
141-036-1Z  
111-022-9  
C184  
C185  
C186  
C187  
C188  
C189  
C190  
C191  
C192  
C193  
C194  
C195  
C196  
C197  
C198  
C200  
C201  
C202  
C203  
C207  
C209  
C211  
C212  
C214  
C216  
C217  
C219  
C220  
C221  
C222  
C223  
C224  
C225  
C226  
C227  
C228  
C230  
C232  
C233  
C234  
C235  
C236  
C237  
C238  
C239  
C240  
C241  
C244  
C247  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
DIP TANTALUM  
DIP TANTALUM  
CHIP CERAMIC  
33PF  
133-306-2Y  
132-012-1Y  
130-A60-4Y  
130-A60-4Y  
132-220-2Y  
130-624-4  
C101  
C102  
C103  
C104  
C105  
C106  
C107  
C108  
C109  
C110  
C113  
C114  
C115  
C119  
C120  
C121  
C122  
C129  
C139  
C144  
C145  
C147  
C148  
C149  
C150  
C151  
C152  
C156  
C157  
C158  
C159  
C161  
C162  
C167  
C168  
C169  
C170  
C172  
C173  
C174  
C175  
C176  
C177  
C178  
C179  
C180  
C181  
C182  
20PF  
0.1UF  
0.1UF  
220PF  
0.68UF  
0.033UF  
0.1UF  
470PF  
0.1UF  
1UF  
130-314-5Y  
130-A60-4Y  
130-314-5Y  
130-A60-4Y  
130-315-6Y  
131-039-1Y  
130-172-2Y  
134-722-1Y  
130-A17-6Y  
130-A60-4Y  
130-172-2Y  
130-172-2Y  
130-A17-6Y  
130-A17-6Y  
130-A60-4Y  
130-172-2Y  
130-172-2Y  
132-220-2Y  
132-220-2Y  
132-220-2Y  
132-220-2Y  
132-220-2Y  
141-008-6Z  
141-012-9Z  
132-220-2Y  
101-A02-8  
0.033UF  
0.1UF  
220PF  
0.001UF  
1UF  
0.0033UF  
10PF  
MYLAR CAPACITOR 0.1UF  
0.01UF  
47PF  
CHIP CERAMIC  
CHIP CERAMIC  
0.1UF  
10PF  
130-170-0Y  
131-039-1Y  
111-008-7Z  
134-761-4Y  
130-A60-4Y  
131-025-8Y  
132-220-2Y  
131-559-4Y  
130-A17-6Y  
104-713-2  
0.001UF  
0.1UF  
MYLAR CAPACITOR 0.01UF  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
470PF  
0.1UF  
0.01UF  
0.01UF  
0.001UF  
0.001UF  
0.1UF  
0.001UF  
220PF  
1.5PF  
0.001UF  
0.01UF  
0.01UF  
220PF  
220PF  
220PF  
220PF  
220PF  
1UF  
ELECT CAPACITOR 47UF  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
220PF  
220PF  
220PF  
470PF  
132-220-2Y  
132-220-2Y  
132-220-2Y  
134-761-4Y  
102-278-6  
ELECT CAPACITOR 2200UF  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
DIP TANTALUM  
CHIP CERAMIC  
0.001UF  
15PF  
130-A17-6Y  
131-511-0Y  
130-A17-6Y  
130-A17-6Y  
130-170-0Y  
132-220-2Y  
138-210-3Y  
130-A17-6Y  
130-172-2Y  
132-220-2Y  
131-511-0Y  
135-613-9Y  
133-321-5Y  
132-012-1Y  
133-932-7Y  
130-A17-6Y  
130-A17-6Y  
138-210-3Y  
130-172-2Y  
141-012-9Z  
130-A17-6Y  
10UF  
0.001UF  
0.001UF  
0.1UF  
220PF  
ELECT CAPACITOR 1000UF  
CHIP CERAMIC 0.1UF  
ELECT CAPACITOR 1000UF  
130-A60-4Y  
101-048-0R  
130-A17-6Y  
130-A17-6Y  
130-A17-6Y  
101-023-7  
220PF  
82PF  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
0.001UF  
0.001UF  
0.001UF  
0.001UF  
0.01UF  
220PF  
15PF  
ELECT CAPACITOR 100UF  
ELECT CAPACITOR 220UF  
102-224-7  
56PF  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
220PF  
132-220-2Y  
130-A17-6Y  
132-220-2Y  
130-A17-6Y  
102-278-6  
3.3PF  
0.001UF  
220PF  
20PF  
39PF  
0.001UF  
0.001UF  
0.001UF  
82PF  
ELECT CAPACITOR 2200UF  
ELECT CAPACITOR 10UF  
101-025-9  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
39PF  
133-932-7Y  
138-210-3Y  
130-A17-6Y  
132-220-2Y  
0.01UF  
10UF  
82PF  
0.001UF  
220PF  
0.001UF  
Page-38-  
December 98  
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MAXON SM-2000 MOBILE  
650-000-0001 SM-2150/VHF MAIN BOARD  
REF #  
C247  
DESCRIPTION  
220PF  
PART #  
132-220-2Y  
REF #  
C355  
DESCRIPTION  
1.2PF  
PART #  
131-216-4Y  
CHIP CERAMIC  
CHIP CERAMIC  
C248  
C250  
C251  
C252  
C253  
C255  
C256  
C257  
C258  
C259  
C260  
C261  
C262  
C263  
C264  
C265  
C266  
C267  
C268  
C271  
C272  
C274  
C279  
C282  
C285  
C286  
C287  
C288  
C289  
C290  
C292  
C295  
C296  
C297  
C298  
C299  
C300  
C301  
C302  
C310  
C311  
C312  
C313  
C314  
C315  
C351  
C352  
C353  
CHIP CERAMIC  
27PF  
132-714-2Y  
104-713-2  
C356  
C359  
C360  
C361  
C362  
C363  
C364  
C369  
C370  
C371  
C372  
C373  
C374  
C375  
C376  
CF101  
CF103  
CF104  
D102  
D103  
D104  
D106  
D107  
D108  
D120  
D124  
D125  
D126  
D127  
D128  
D129  
D351  
D352  
D353  
FB101  
IC101  
IC102  
IC104  
IC105  
IC107  
IC108  
IC109  
IC113  
J1  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP TANTALUM  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
FILTER CRYSTAL  
FILTER CERAMIC  
FILTER CERAMIC  
DIODE SI CHIP  
DIODE  
4PF  
134-007-7Y  
130-A17-6Y  
132-011-0Y  
130-A17-6Y  
130-A17-6Y  
130-A17-6Y  
130-A17-6Y  
131-030-2Y  
130-A17-6Y  
130-A60-4Y  
130-172-2Y  
143-312-0Z  
130-A17-6Y  
130-A17-6Y  
130-A60-4Y  
271-053-6  
270-007-0Z  
270-027-8Z  
243-051-5  
243-012-0  
243-012-0  
243-052-6  
249-005-4  
243-081-2  
243-087-8  
245-008-7Z  
243-052-6  
243-063-6  
243-073-5  
243-063-6  
243-052-6  
243-054-8  
243-054-8  
243-054-8  
320-423-8  
220-131-3  
220-375-7  
231-064-4  
220-378-0  
222-013-0A  
229-289-8  
223-421-0  
231-064-4  
420-728-5  
310-657-0  
311-079-3  
310-861-7  
310-706-1  
ELECT CAPACITOR 47UF  
0.001UF  
2PF  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
470PF  
0.001UF  
75PF  
134-761-4Y  
130-A17-6Y  
137-504-4Y  
134-761-4Y  
137-504-4Y  
130-172-2Y  
134-761-4Y  
130-172-2Y  
130-172-2Y  
133-937-2Y  
137-512-1Z  
130-A17-6Y  
130-A60-4Y  
130-A17-6Y  
130-A17-6Y  
130-A17-6Y  
132-225-7Z  
131-025-8Y  
131-539-6Z  
131-025-8Y  
101-025-9  
0.001UF  
0.001UF  
0.001UF  
0.001UF  
1PF  
470PF  
75PF  
0.01UF  
470PF  
0.01UF  
0.01UF  
39PF  
0.001UF  
0.1UF  
0.01UF  
3.3UF  
75PF  
0.001UF  
0.001UF  
0.1UF  
0.001UF  
0.1UF  
0.001UF  
0.001UF  
0.001UF  
22PF  
0.001UF  
15PF  
DIODE  
0.001UF  
DIODE SI CHIP  
ELECT CAPACITOR 10UF  
DIODE SCHOTTKY CHIP  
DIODE CHIP  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
CHIP CERAMIC  
470PF  
0.001UF  
0.001UF  
0.001UF  
220PF  
82PF  
134-761-4Y  
130-A17-6Y  
130-A17-6Y  
130-A17-6Y  
132-220-2Y  
138-210-3Y  
130-424-0Y  
132-220-2Y  
130-172-2Y  
134-722-1Y  
134-722-1Y  
132-216-9Y  
134-722-1Y  
134-761-4Y  
132-220-2Y  
130-170-0Y  
133-010-4Y  
131-025-8Y  
137-011-5Y  
131-847-4Y  
131-847-4Y  
131-539-6Z  
130-A17-6Y  
137-007-1Y  
139-003-8Y  
DIODE CHIP  
DIODE RECTIFIER  
DIODE SI CHIP  
DIODE SWITCHING  
DIODE PIN  
0.047UF  
220PF  
0.01UF  
47PF  
DIODE SWITCHING  
DIODE SI CHIP  
DIODE  
DIODE  
47PF  
DIODE  
22PF  
FERITE BEAD  
I.C PLL  
47PF  
470PF  
220PF  
0.1UF  
30PF  
DBM MIXER MODULE  
I.C OP AMP  
I.C REGULATOR  
I.C REGULATOR  
I.C  
0.001UF  
7PF  
I.C POWER FM IF  
I.C OP AMP  
180PF  
180PF  
15PF  
JACK MINIATURE  
L107  
L108  
L110  
L111  
COIL CHIP  
COIL CHIP  
COIL CHIP  
COIL CHIP  
1UH  
0.001UF  
7PF  
1.0UH  
47NH  
0.15UH  
9PF  
Page-39-  
December 98  
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MAXON SM-2000 MOBILE  
650-000-0001 SM-2150/VHF MAIN BOARD  
REF #  
L113  
DESCRIPTION  
COIL SPRING  
PART #  
310-794-0  
REF #  
Q127  
DESCRIPTION  
TRANSISTOR  
PART #  
202-095-8Z  
L115  
L116  
L117  
L118  
L119  
L120  
L121  
L122  
L123  
L124  
L125  
L126  
L127  
L128  
L129  
L130  
L131  
L132  
L134  
L135  
L225  
L226  
L227  
L228  
L229  
L351  
L352  
L354  
L356  
L357  
L358  
Q101  
Q102  
Q103  
Q104  
Q105  
Q106  
Q108  
Q113  
Q114  
Q116  
Q117  
Q118  
Q120  
Q121  
Q122  
Q123  
Q124  
Q125  
COIL SPRING  
COIL SPRING  
COIL SPRING  
COIL CHOKE 1K  
310-793-9  
310-224-2  
310-368-9  
310-218-7  
310-706-1  
310-218-7  
310-275-8  
509-772  
Q128  
Q130  
Q132  
Q133  
Q134  
Q135  
Q137  
Q139  
Q140  
Q219  
Q351  
Q352  
Q353  
Q354  
Q360  
R100  
R1001  
R101  
R102  
R103  
R104  
R105  
R106  
R107  
R108  
R110  
R111  
R112  
R113  
R114  
R116  
R117  
R118  
R119  
R130  
R131  
R132  
R133  
R134  
R135  
R136  
R137  
R138  
R139  
R140  
R141  
R142  
R143  
R144  
BRT  
202-092-5  
TRANSISTOR  
200-003-5  
TRANSISTOR  
202-113-1  
TRANSISTOR  
202-113-1  
COIL CHIP  
0.15UH  
TRANSISTOR  
202-095-8Z  
202-095-8Z  
202-095-8Z  
202-092-5  
COIL CHOKE 1K  
COIL SPRING  
COIL ASS’Y  
COIL CHIP  
TRANSISTOR  
TRANSISTOR  
BRT  
47NH  
310-861-7  
310-711-5  
310-368-9  
310-627-3  
311-224-7  
311-214-8  
310-536-4  
311-214-8  
311-214-8  
311-305-7  
509-772  
TRANSISTOR  
202-095-8Z  
202-095-8Z  
203-116-9  
COIL CHIP  
0.68UH  
TRANSISTOR  
COIL SPRING  
COIL SPRING  
COIL SPRING  
COIL SPRING  
COIL SPRING  
COIL SPRING  
COIL SPRING  
COIL SPRING  
COIL ASS’Y  
COIL ASS’Y  
COIL AXIAL  
COIL CHIP  
TRANSISTOR  
TRANSISTOR  
203-116-9  
TRANSISTOR  
202-099-2Z  
202-098-1  
TRANSISTOR  
TRANSISTOR  
202-113-1  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
2.2K  
470  
1.8K  
0
060-222-2Z  
060-471-0Z  
060-182-9Z  
060-000-8Z  
060-000-8Z  
060-182-9Z  
060-471-0Z  
060-182-9Z  
060-471-0Z  
060-000-8Z  
060-122-5Z  
060-272-7Z  
060-752-4Z  
060-104-9Z  
060-103-8Z  
060-103-8Z  
060-243-1Z  
060-103-8Z  
060-103-8Z  
060-122-5Z  
060-913-3Z  
060-472-1Z  
060-203-5Z  
060-682-4Z  
060-390-8Z  
060-272-7Z  
060-272-7Z  
060-471-0Z  
060-223-3Z  
060-100-5Z  
060-471-0Z  
060-103-8Z  
060-182-9Z  
060-510-2  
509-013  
0
2.2UH  
1UH  
310-378-7  
310-657-0  
310-862-8Y  
310-381-0  
310-381-0  
311-079-3  
311-078-2  
311-083-6  
311-117-4  
311-083-6  
311-079-3  
202-113-1  
202-106-5  
202-106-5  
202-113-1  
218-057-7Z  
203-096-4  
202-095-8Z  
200-003-5  
200-003-5  
203-181-7  
200-045-3  
203-043-6Z  
203-087-6  
202-095-8Z  
203-111-4  
202-095-8Z  
202-113-1  
202-066-2  
1.8K  
470  
1.8K  
470  
0
COIL CHIP  
220UH  
1MH  
COIL AXIAL  
COIL AXIAL  
COIL CHIP  
1MH  
1.0UH  
0.82UH  
2.2UH  
1.2K  
2.7K  
7.5K  
100K  
10K  
10K  
24K  
10K  
10K  
1.2K  
91K  
4.7K  
20K  
6.8K  
39  
COIL CHIP  
COIL CHIP  
COIL CHIP  
COIL CHIP  
2.2UH  
1.0UH  
COIL CHIP  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
2.7K  
2.7K  
470  
22K  
10  
470  
10K  
1.8K  
51  
Page-40-  
December 98  
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MAXON SM-2000 MOBILE  
650-000-0001 SM-2150/VHF MAIN BOARD  
REF #  
R146  
DESCRIPTION  
PART #  
060-153-3Z  
REF #  
R206  
DESCRIPTION  
PART #  
060-272-7Z  
CHIP RESISTOR  
15K  
560K  
15K  
10  
CHIP RESISTOR  
2.7K  
100  
100  
68K  
22K  
22K  
10K  
10K  
10K  
39K  
56K  
22K  
22K  
2.2K  
0
R147  
R148  
R149  
R150  
R151  
R152  
R153  
R154  
R156  
R157  
R158  
R159  
R160  
R161  
R162  
R163  
R164  
R168  
R170  
R172  
R173  
R174  
R175  
R176  
R177  
R178  
R180  
R181  
R182  
R182  
R183  
R184  
R185  
R187  
R190  
R191  
R192  
R193  
R194  
R195  
R196  
R197  
R198  
R200  
R201  
R202  
R203  
R204  
R205  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
FILM RESISTOR  
FILM RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
FILM RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
060-564-1Z  
060-153-3Z  
060-100-5Z  
060-564-1Z  
060-223-3Z  
060-470-9Z  
060-392-2Z  
060-229-9Z  
060-682-4Z  
060-301-8Z  
060-332-8Z  
060-479-8Z  
060-220-0Z  
060-182-9Z  
060-689-5Z  
060-470-9Z  
060-151-1Z  
060-103-8Z  
060-471-0Z  
060-332-8Z  
060-332-8Z  
060-100-5Z  
030-331-8Z  
030-121-5Z  
060-122-5Z  
060-122-5Z  
060-103-8Z  
030-121-5Z  
060-121-4Z  
060-151-1Z  
060-474-3Z  
060-100-5Z  
060-473-2Z  
060-103-8Z  
060-223-3Z  
060-272-7Z  
060-223-3Z  
060-272-7Z  
060-103-8Z  
060-183-0Z  
060-823-5Z  
060-104-9Z  
060-102-7Z  
060-473-2Z  
060-334-0Z  
060-272-7Z  
060-154-4Z  
060-102-7Z  
060-101-6Z  
R207  
R210  
R211  
R213  
R214  
R215  
R217  
R218  
R219  
R220  
R221  
R222  
R223  
R224  
R250  
R251  
R252  
R253  
R351  
R352  
R353  
R354  
R355  
R356  
R357  
R358  
RV101  
RV102  
RV103  
RV104  
RV105  
T101  
T102  
T103  
T104  
TH101  
X101  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
CHIP RESISTOR  
060-101-6Z  
060-101-6Z  
060-683-5Z  
060-223-3Z  
060-223-3Z  
060-103-8Z  
060-103-8Z  
060-103-8Z  
060-393-3Z  
060-563-0Z  
060-223-3Z  
060-223-3Z  
060-222-2Z  
060-000-8Z  
060-123-6Z  
060-202-4Z  
060-102-7Z  
060-182-9Z  
060-103-8Z  
060-331-7Z  
060-470-9Z  
060-103-8Z  
060-331-7Z  
060-470-9Z  
060-122-5Z  
060-103-8Z  
071-223-1  
560K  
22K  
47  
3.9K  
2.2  
6.8K  
300  
3.3K  
4.7  
22  
1.8K  
6.8  
12K  
2K  
47  
150  
10K  
470  
3.3K  
3.3K  
10  
1K  
1.8K  
10K  
330  
47  
10K  
330  
47  
330  
120  
1.2K  
1.2K  
10K  
120  
120  
150  
470K  
10  
1.2K  
10K  
RESISTOR SEMIFIXED 22KB  
RESISTOR SEMIFIXED 1KB  
RESISTOR SEMIFIXED 10KB  
RESISTOR SEMIFIXED 10KB  
RESISTOR SEMIFIXED 4.7KB  
071-102-5  
071-103-6  
071-103-6  
071-472-9  
COIL IFT  
COIL IFT  
COIL  
600NH 45MHZ  
600NH 45MHZ  
321-014-7  
47K  
10K  
22K  
2.7K  
22K  
2.7K  
10K  
18K  
82K  
100K  
1K  
321-014-7  
455KHZ DETECTOR 320-232-2  
TRANSFORMER  
THERMISTOR CHIP 33K  
CRYSTAL NR2B 44.545M  
CHOKE  
300-008-1  
098-333-8  
261-932-7Z  
47K  
330K  
2.7K  
150K  
1K  
100  
Page-41-  
December 98  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MAXON SM-2000 MOBILE  
650-000-0002 SM-2450/UHF MAIN BOARD  
650-000-0002 SM-2450/UHF MAIN BOARD  
BAND CHART  
SM-2450A UHF BAND 1  
(400-430 MHz)  
SM-2450C UHF BAND 2  
(420-450 MHz)  
SM-2450D UHF BAND 3  
(440-470 MHz)  
REF #  
PART #  
VALUE  
REF #  
PART #  
VALUE  
REF #  
PART #  
VALUE  
FRONT-END PCB ASSEMBLY  
650-110-0007  
FRONT-END PCB ASSEMBLY  
650-110-0008  
FRONT-END PCB ASSEMBLY  
650-110-0001  
MAIN BOARD PARTS  
MAIN BOARD PARTS  
MAIN BOARD PARTS  
C130  
C133  
C134  
133-932-7Y  
131-039-1Y  
134-767-0Y  
39pF  
10pF  
4.7pF  
C130  
C133  
C134  
C135  
C136  
C158  
C242  
C243  
C272  
C273  
C275  
C277  
C281  
C283  
IC103  
R180  
R182  
R210  
133-932-7Y  
138-004-4Y  
134-767-0Y  
138-004-4Y  
138-004-4Y  
135-010-4Y  
138-004-4Y  
134-767-0Y  
135-019-3Y  
131-029-2Y  
131-029-2Y  
131-029-2Y  
137-007-1Y  
136-015-4Y  
220-348-3  
39pF  
8pF  
C130  
C133  
C134  
C135  
C136  
C158  
C242  
C243  
C272  
C273  
C275  
C277  
C281  
C283  
IC103  
R180  
R182  
R210  
132-714-2Y  
136-833-6Y  
134-007-7Y  
138-004-4Y  
131-208-7Y  
135-010-4Y  
138-004-4Y  
134-767-0Y  
135-019-3Y  
137-011-5Y  
139-006-1Y  
131-029-2Y  
137-007-1Y  
136-015-4Y  
220-350-5  
27pF  
6.8pF  
4pF  
4.7pF  
8pF  
C135  
C136  
C158  
C242  
C243  
C272  
C273  
C275  
C277  
C281  
C283  
IC103  
R180  
R182  
R210  
139-003-8Y  
139-003-8Y  
131-039-1Y  
131-039-1Y  
131-039-1Y  
136-015-4Y  
131-029-2Y  
131-029-2Y  
131-029-2Y  
131-039-1Y  
137-011-5Y  
220-347-2  
9pF  
8pF  
9pF  
8pF  
12pF  
5pF  
10pF  
10pF  
10pF  
6pF  
5pF  
8pF  
8pF  
4.7pF  
5pF  
4.7pF  
5pF  
10PF  
10PF  
10PF  
10pF  
7pF  
10PF  
10PF  
10PF  
7pF  
7PF  
9PF  
10PF  
7pF  
6pF  
6pF  
M57729L  
4.7K  
M57729  
4.7K  
M57729H  
3.9K  
060-472-1Z  
060-221-1Z  
060-470-9Z  
060-472-1Z  
060-221-1Z  
060-470-9Z  
060-392-2Z  
060-101-6Z  
060-470-9Z  
220 OHM  
47 OHM  
220 OHM  
47 OHM  
100 OHM  
47 OHM  
650-XXX-XXXX  
Page-42-  
December 98  
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MAXON SM-2000 MOBILE  
650-000-0002 SM-2450/UHF MAIN BOARD  
BAND CHART(continued)  
SM-2450E UHF BAND 4  
(470-490 MHz)  
SM-2450B UHF BAND 5  
(490-512 MHz)  
REF #  
PART #  
VALUE  
REF #  
PART #  
VALUE  
FRONT-END PCB ASSEMBLY  
650-110-0009  
FRONT-END PCB ASSEMBLY  
650-110-0010  
MAIN BOARD PARTS  
MAIN BOARD PARTS  
C130  
C133  
C134  
C135  
C136  
C158  
C242  
C243  
C272  
C273  
C275  
C277  
C281  
C283  
IC103  
R180  
R182  
R210  
131-829-8Y  
136-015-4Y  
133-321-5Y  
135-019-3Y  
137-007-1Y  
133-321-5Y  
137-007-1Y  
133-321-5Y  
134-007-7Y  
137-011-5Y  
139-006-1Y  
138-230-1Y  
131-039-1Y  
135-019-3Y  
220-349-4  
18pF  
6pF  
C130  
C133  
C134  
C135  
C136  
C158  
C242  
C243  
C272  
C273  
C275  
C277  
C281  
C283  
IC103  
R180  
R182  
R210  
132-407-5Y  
134-007-7Y  
133-321-5Y  
135-019-3Y  
138-004-4Y  
134-007-7Y  
135-019-3Y  
133-321-5Y  
135-019-3Y  
131-029-2Y  
131-029-2Y  
131-029-2Y  
131-039-1Y  
134-007-7Y  
220-346-1  
24pF  
4pF  
3.3pF  
5pF  
3.3pF  
5pF  
7pF  
8pF  
3.3pF  
7pF  
4pF  
5pF  
3.3pF  
4pF  
3.3pF  
5pF  
7PF  
10PF  
10PF  
10PF  
10pF  
4pF  
9PF  
8PF  
10pF  
5pF  
M57729UH  
2.7K  
M57729SH  
4.7K  
060-272-7Z  
060-101-6Z  
060-470-9Z  
060-472-1Z  
060-221-1Z  
060-470-9Z  
100 OHM  
47 OHM  
220 OHM  
47 OHM  
Page-43-  
December 98  
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MAXON SM-2000 MOBILE  
650-000-0002 SM-2450/UHF MAIN BOARD  
REF #  
FRONT-END PCB ASSEMBLY (REFER TO BAND CHART)  
DESCRIPTION  
PART #  
REF #  
C163  
DESCRIPTION  
CHIP CERAMIC 6PF  
PART #  
136-005-5Y  
ANT1  
ANT1  
ANT1  
C101  
C102  
C103  
C104  
C105  
C106  
C107  
C108  
C109  
C110  
C113A  
C114  
C115  
C118  
C119  
C120  
C121  
C122  
C125  
C126  
C127  
C128  
C129  
C131  
C137  
C138  
C139  
C140  
C141  
C142  
C143  
C144  
C145  
C146  
C147  
C148  
C149  
C150  
C151  
C152  
C155  
C156  
C157  
C159  
C160  
C162  
CONNECTOR ANT  
422-907-0  
C164  
C165  
C167  
C168  
C169  
C172  
C173  
C174  
C175  
C176  
C177  
C178  
C179  
C180  
C181  
C182  
C183  
C184  
C185  
C186  
C187  
C188  
C189  
C190  
C191  
C192  
C193  
C194  
C195  
C196  
C197  
C198  
C199  
C200  
C201  
C202  
C203  
C204  
C207  
C209  
C210  
C211  
C212  
C214  
C216  
C217  
C218  
C218  
C219  
CHIP CERAMIC 12PF  
CHIP CERAMIC 6PF  
131-208-7Y  
136-005-5Y  
138-210-3Y  
130-A17-6Y  
134-722-1Y  
131-511-0Y  
135-613-9Y  
133-321-5Y  
132-012-1Y  
133-932-7Y  
130-A17-6Y  
130-A17-6Y  
138-210-3Y  
130-172-2Y  
141-012-9Z  
130-A17-6Y  
134-722-1Y  
133-010-4Y  
131-511-0Y  
130-A60-4Y  
130-A60-4Y  
132-220-2Y  
130-170-0Y  
130-314-5Y  
130-A60-4Y  
130-314-5Y  
130-A60-4Y  
130-315-6Y  
131-039-1Y  
130-172-2Y  
134-722-1Y  
130-A17-6Y  
131-208-7Y  
130-A60-4Y  
130-172-2Y  
130-172-2Y  
130-A17-6Y  
136-005-5Y  
130-A17-6Y  
130-A60-4Y  
112-211-8Z  
130-172-2Y  
130-172-2Y  
132-220-2Y  
132-220-2Y  
132-220-2Y  
101-025-9  
CONNECTOR SW-1456(BNC-R)  
PIN CU &1.1X13(101-01)  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 5PF  
421-655-7  
860-129  
CHIP CERAMIC 82PF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 47PF  
CHIP CERAMIC 15PF  
CHIP CERAMIC 56PF  
CHIP CERAMIC 3.3PF  
CHIP CERAMIC 20PF  
CHIP CERAMIC 39PF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 82PF  
CHIP CERAMIC 0.01UF  
DIP TANTALUM 10UF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 47PF  
CHIP CERAMIC 30PF  
CHIP CERAMIC 15PF  
CHIP CERAMIC 0.1UF  
CHIP CERAMIC 0.1UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 0.1UF  
CHIP CERAMIC 0.033UF  
CHIP CERAMIC 0.1UF  
CHIP CERAMIC 0.033UF  
CHIP CERAMIC 0.1UF  
CHIP CERAMIC 0.0033UF  
CHIP CERAMIC 10PF  
CHIP CERAMIC 0.01UF  
CHIP CERAMIC 47PF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 12PF  
CHIP CERAMIC 0.1UF  
CHIP CERAMIC 0.01UF  
CHIP CERAMIC 0.01UF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 6PF  
132-220-2Y  
132-220-2Y  
132-220-2Y  
132-220-2Y  
135-010-4Y  
134-761-4Y  
130-170-0Y  
132-220-2Y  
132-220-2Y  
130-A17-6Y  
120-313-6  
CHIP CERAMIC 470PF  
CHIP CERAMIC 0.1UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 0.001UF  
POLY CAPACITOR 0.33UF  
MYLAR CAPACITOR 0.01UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 4.7PF  
CHIP CERAMIC 15PF  
MYLAR CAPACITOR 0.01UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 0.1UF  
CHIP TANTALUM 1UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 470PF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 0.1UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 68PF  
CHIP CERAMIC 2.2PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 47PF  
CHIP CERAMIC 5PF  
111-008-7Z  
132-220-2Y  
134-767-0Y  
131-511-0Y  
111-008-7Z  
132-220-2Y  
130-170-0Y  
141-036-1Z  
132-220-2Y  
134-761-4Y  
130-A17-6Y  
130-170-0Y  
132-220-2Y  
136-816-5Y  
132-266-4Y  
132-220-2Y  
134-722-1Y  
135-010-4Y  
131-208-7Y  
132-220-2Y  
130-504-9Y  
130-A17-6Y  
131-208-7Y  
104-713-2  
CHIP CERAMIC 12PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 0.5PF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 12PF  
ELECT CAPACITOR 47UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 470PF  
ELECT CAPACITOR 2200UF  
CHIP CERAMIC 2.2PF  
CHIP CERAMIC 47PF  
CHIP CERAMIC 5.6PF  
CHIP CERAMIC 6PF  
132-220-2Y  
132-220-2Y  
132-220-2Y  
134-761-4Y  
102-278-6  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 0.1UF  
MYLAR CAPACITOR 0.022UF  
CHIP CERAMIC 0.01UF  
CHIP CERAMIC 0.01UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
ELECT CAPACITOR 10UF  
ELECT CAPACITOR 10UF  
CHIP CERAMIC 220PF  
132-266-4Y  
134-722-1Y  
135-627-2Y  
136-005-5Y  
130-A17-6Y  
133-321-5Y  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 3.3PF  
101-025-9  
132-220-2Y  
Page-44-  
December 98  
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MAXON SM-2000 MOBILE  
650-000-0002 SM-2450/UHF MAIN BOARD  
REF #  
C219  
DESCRIPTION  
CHIP CERAMIC 220PF  
PART #  
132-220-2Y  
REF #  
C288  
DESCRIPTION  
CHIP CERAMIC 220PF  
PART #  
132-220-2Y  
C220  
C221  
C222  
C223  
C224  
C225  
C226  
C227  
C230  
C231  
C232  
C233  
C234  
C235  
C236  
C237  
C238  
C239  
C240  
C247  
C249  
C250  
C251  
C252  
C253  
C255  
C256  
C257  
C258  
C259  
C260  
C261  
C262  
C263  
C264  
C265  
C266  
C267  
C269  
C271  
C273  
C279  
C280  
C282  
C284  
C285  
C286  
C287  
CHIP CERAMIC 220PF  
DIP TANTALUM 1UF  
132-220-2Y  
141-008-6Z  
141-012-9Z  
132-220-2Y  
101-A02-8  
130-A60-4Y  
101-048-0  
C289  
C290  
C292  
C294  
C295  
C296  
C297  
C298  
C299  
C300  
C301  
C303  
C407  
C435  
C438  
C558  
CHIP CERAMIC 82PF  
CHIP CERAMIC 0.047UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 0.01UF  
CHIP CERAMIC 47PF  
CHIP CERAMIC 12PF  
CHIP CERAMIC 22PF  
CHIP CERAMIC 47PF  
CHIP CERAMIC 470PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
ELECT CAPACITOR 10UF  
ELECT CAPACITOR 1UF  
ELECT CAPACITOR 10UF  
ELECT CAPACITOR 10UF  
138-210-3Y  
130-424-0Y  
132-220-2Y  
132-220-2Y  
130-172-2Y  
134-722-1Y  
131-208-7Y  
132-216-9Y  
134-722-1Y  
134-761-4Y  
132-220-2Y  
132-220-2Y  
101-025-9  
101-006-2  
101-025-9  
101-025-9  
427-335-8  
181-005-5  
271-054-7  
270-007-0Z  
270-027-8Z  
421-677-7  
242-022-4  
242-022-4  
243-012-0  
243-012-0  
243-051-5  
243-052-6  
249-005-4  
243-081-2  
243-058-2  
243-012-0  
245-008-7Z  
243-052-6  
243-063-6  
243-073-5  
243-063-6  
243-052-6  
320-536-5  
220-131-3  
220-375-7  
231-064-4  
220-378-0  
222-013-0A  
229-289-8  
223-421-0  
223-224-9  
420-728-5  
DIP TANTALUM 10UF  
CHIP CERAMIC 220PF  
ELECT CAPACITOR 1000UF  
CHIP CERAMIC 0.1UF  
ELECT CAPACITOR 1000UF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 220PF  
ELECT CAPACITOR 100UF  
ELECT CAPACITOR 220UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 0.001UF  
ELECT CAPACITOR 2200UF  
ELECT CAPACITOR 10UF  
CHIP CERAMIC 10PF  
CHIP CERAMIC 470PF  
CHIP CERAMIC 220PF  
ELECT CAPACITOR 47UF  
CHIP CERAMIC 470PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 33PF  
CHIP CERAMIC 470PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 4PF  
130-A17-6Y  
130-A17-6Y  
132-220-2Y  
101-023-7  
102-224-7  
132-220-2Y  
130-A17-6Y  
132-220-2Y  
130-A17-6Y  
102-278-6  
CABLE1 COAXIAL UT85 SEMI-RIGID  
101-025-9  
CF1  
FEED THROUGH CAP 0.001UF  
FILTER CRYSTAL  
131-039-1Y  
134-761-4Y  
132-220-2Y  
104-713-2  
CF101  
CF103  
CF104  
FILTER CERAMIC  
FILTER CERAMIC  
CON405 CONNECTOR BOX SOCKET  
134-761-4Y  
132-220-2Y  
133-306-2Y  
134-761-4Y  
132-220-2Y  
130-A17-6Y  
132-220-2Y  
132-220-2Y  
130-A17-6Y  
132-220-2Y  
130-A17-6Y  
131-025-8Y  
132-220-2Y  
132-220-2Y  
132-220-2Y  
132-220-2Y  
134-007-7Y  
131-025-8Y  
131-029-2Y  
104-713-2  
D101  
D102  
D103  
D104  
D105  
D106  
D107  
D108  
D120  
D121  
D124  
D125  
D126  
D127  
D128  
D129  
FB  
DIODE VARICAP CHIP  
DIODE VARICAP CHIP  
DIODE  
DIODE  
DIODE SI CHIP  
DIODE SI CHIP  
DIODE SCHOTTKY CHIP  
DIODE PIN  
DIODE  
DIODE  
DIODE RECTIFIER  
DIODE SI CHIP  
DIODE SWITCHING  
DIODE PIN  
DIODE SWITCHING  
DIODE SI CHIP  
CORE BEAD  
CHIP CERAMIC 0.001UF  
CHIP CERAMIC 10PF  
ELECT CAPACITOR 47UF  
CHIP CERAMIC 5PF  
IC101  
IC102  
IC104  
IC105  
IC107  
IC108  
IC109  
IC401  
J1  
I.C PLL  
DBM MIXER MODULE  
I.C OP AMP  
135-019-3Y  
134-761-4Y  
134-761-4Y  
132-220-2Y  
132-220-2Y  
132-220-2Y  
I.C REGULATOR  
I.C REGULATOR  
I.C  
CHIP CERAMIC 470PF  
CHIP CERAMIC 470PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
CHIP CERAMIC 220PF  
I.C POWER FM IF  
I.C  
JACK MINIATURE  
Page-45-  
December 98  
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MAXON SM-2000 MOBILE  
650-000-0002 SM-2450/UHF MAIN BOARD  
REF #  
L101  
DESCRIPTION  
COIL CHIP 0.68UH  
PART #  
310-711-5  
REF #  
Q132  
DESCRIPTION  
TRANSISTOR  
PART #  
202-113-1  
L102  
L103  
L104  
L106  
L107  
L108  
L110  
L111  
L113  
L114  
L115  
L116  
L118  
L119  
L120  
L121  
L122  
L123  
L124  
L125  
L225  
L226  
L227  
L228  
L229  
Q101  
Q102  
Q103  
Q104  
Q105  
Q106  
Q107  
Q108  
Q110  
Q111  
Q113  
Q114  
Q116  
Q117  
Q119  
Q121  
Q122  
Q123  
Q124  
Q125  
Q127  
Q128  
Q130  
COIL CHIP 0.68UH  
COIL CHIP 47NH  
COIL CHIP 27NH  
COIL CHIP 27NH  
COIL SPRING  
COIL CHIP 18NH  
COIL CHIP 18NH  
COIL CHIP 0.15UH  
COIL SPRING  
COIL CHIP 0.15UH  
COIL SPRING  
COIL SPRING  
COIL SPRING  
COIL CHIP 0.15UH  
COIL SPRING  
COIL SPRING  
COIL SPRING  
COIL CHIP 18NH  
COIL CHIP 18NH  
COIL SPRING  
COIL AXIAL 2.2UH  
COIL CHIP 1UH  
COIL CHIP 220UH  
COIL AXIAL 1MH  
COIL AXIAL 1MH  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
BRT  
310-711-5  
310-861-7  
310-860-6  
310-860-6  
310-304-1  
310-859-6  
310-859-6  
310-706-1  
311-158-1  
310-706-1  
311-158-1  
311-178-9  
311-180-1  
310-706-1  
311-180-1  
311-180-1  
311-179-0  
310-859-6  
310-859-6  
311-180-1  
310-378-7  
310-657-0  
310-862-8Y  
310-381-0  
310-381-0  
202-113-1  
202-106-5  
202-106-5  
202-113-1  
218-057-7Z  
203-096-4  
202-113-1  
203-104-8  
200-003-5  
200-003-5  
200-003-5  
200-003-5  
200-003-5  
200-045-3  
202-092-5  
202-095-8Z  
203-111-4  
202-095-8Z  
202-113-1  
202-066-2  
202-095-8Z  
202-092-5  
200-003-5  
Q133  
Q134  
Q135  
Q137  
Q140  
Q219  
R100  
R101  
R102  
R103  
R104  
R105  
R106  
R107  
R108  
R109  
R110  
R111  
R112  
R113  
R114  
R115  
R116  
R117  
R118  
R119  
R120  
R121  
R122  
R123  
R124  
R125  
R126  
R127  
R128  
R130  
R131  
R132  
R133  
R134  
R135  
R136  
R137  
R138  
R139  
R140  
R141  
R142  
TRANSISTOR  
202-113-1  
TRANSISTOR  
202-095-8Z  
202-095-8Z  
202-095-8Z  
202-095-8Z  
202-095-8Z  
060-222-2Z  
060-182-9Z  
060-000-8Z  
060-000-8Z  
060-911-1Z  
060-101-6Z  
060-911-1Z  
060-101-6Z  
060-000-8Z  
060-103-8Z  
060-302-1Z  
060-272-7Z  
060-272-7Z  
060-104-9Z  
060-103-8Z  
060-101-6Z  
060-220-0Z  
060-562-9Z  
060-332-8Z  
060-101-6Z  
060-470-9Z  
060-100-5Z  
060-151-1Z  
060-682-4Z  
060-100-5Z  
060-221-1Z  
060-123-6Z  
060-392-2Z  
060-122-5Z  
060-274-9Z  
060-122-5Z  
060-752-4Z  
060-123-6Z  
060-392-2Z  
060-122-5Z  
060-272-7Z  
060-272-7Z  
060-471-0Z  
060-223-3Z  
060-100-5Z  
060-471-0Z  
060-103-8Z  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
CHIP RESISTOR 2.2K  
CHIP RESISTOR 1.8K  
CHIP RESISTOR 0  
CHIP RESISTOR 0  
CHIP RESISTOR 910  
CHIP RESISTOR 100  
CHIP RESISTOR 910  
CHIP RESISTOR 100  
CHIP RESISTOR 0  
CHIP RESISTOR 10K  
CHIP RESISTOR 3K  
CHIP RESISTOR 2.7K  
CHIP RESISTOR 2.7K  
CHIP RESISTOR 100K  
CHIP RESISTOR 10K  
CHIP RESISTOR 100  
CHIP RESISTOR 22  
CHIP RESISTOR 5.6K  
CHIP RESISTOR 3.3K  
CHIP RESISTOR 100  
CHIP RESISTOR 47  
CHIP RESISTOR 10  
CHIP RESISTOR 150  
CHIP RESISTOR 6.8K  
CHIP RESISTOR 10  
CHIP RESISTOR 220  
CHIP RESISTOR 12K  
CHIP RESISTOR 3.9K  
CHIP RESISTOR 1.2K  
CHIP RESISTOR 270K  
CHIP RESISTOR 1.2K  
CHIP RESISTOR 7.5K  
CHIP RESISTOR 12K  
CHIP RESISTOR 3.9K  
CHIP RESISTOR 1.2K  
CHIP RESISTOR 2.7K  
CHIP RESISTOR 2.7K  
CHIP RESISTOR 470  
CHIP RESISTOR 22K  
CHIP RESISTOR 10  
CHIP RESISTOR 470  
CHIP RESISTOR 10K  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
TRANSISTOR  
BRT  
TRANSISTOR  
Page-46-  
December 98  
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MAXON SM-2000 MOBILE  
650-000-0002 SM-2450/UHF MAIN BOARD  
REF #  
R140  
DESCRIPTION  
CHIP RESISTOR 10  
PART #  
060-100-5Z  
REF #  
R202  
DESCRIPTION  
CHIP RESISTOR 2.7K  
PART #  
060-272-7Z  
R141  
R142  
R143  
R144  
R146  
R147  
R148  
R149  
R150  
R151  
R152  
R153  
R154  
R156  
R157  
R158  
R159  
R160  
R161  
R162  
R163  
R164  
R165  
R166  
R168  
R170  
R172  
R173  
R175  
R176  
R177  
R178  
R181  
R183  
R184  
R185  
R187  
R190  
R191  
R192  
R193  
R194  
R195  
R196  
R197  
R198  
R200  
R201  
CHIP RESISTOR 470  
CHIP RESISTOR 10K  
CHIP RESISTOR 1.8K  
CHIP RESISTOR 51  
CHIP RESISTOR 15K  
CHIP RESISTOR 560K  
CHIP RESISTOR 15K  
CHIP RESISTOR 10  
CHIP RESISTOR 560K  
CHIP RESISTOR 22K  
CHIP RESISTOR 47  
CHIP RESISTOR 3.9K  
CHIP RESISTOR 2.2  
CHIP RESISTOR 15K  
CHIP RESISTOR 300  
CHIP RESISTOR 10K  
CHIP RESISTOR 68  
CHIP RESISTOR 10  
CHIP RESISTOR 560  
CHIP RESISTOR 2.2K  
CHIP RESISTOR 470  
CHIP RESISTOR 10  
CHIP RESISTOR 470  
CHIP RESISTOR 0  
060-471-0Z  
060-103-8Z  
060-182-9Z  
060-510-2  
R203  
R204  
R205  
R206  
R207  
R211  
R213  
R214  
R215  
R217  
R218  
R219  
R220  
R221  
R222  
R223  
R225  
R250  
R251  
R252  
R253  
R458  
R601  
R602  
RV101  
RV102  
RV103  
RV104  
RV105  
T101  
T102  
T103  
T104  
TC101  
TH101  
TP1  
CHIP RESISTOR 150K  
CHIP RESISTOR 1K  
CHIP RESISTOR 100  
CHIP RESISTOR 2.7K  
CHIP RESISTOR 100  
CHIP RESISTOR 68K  
CHIP RESISTOR 22K  
CHIP RESISTOR 22K  
CHIP RESISTOR 10K  
CHIP RESISTOR 10K  
CHIP RESISTOR 10K  
CHIP RESISTOR 39K  
CHIP RESISTOR 56K  
CHIP RESISTOR 22K  
CHIP RESISTOR 22K  
CHIP RESISTOR 2.2K  
CHIP RESISTOR 470  
CHIP RESISTOR 12K  
CHIP RESISTOR 2K  
CHIP RESISTOR 1K  
CHIP RESISTOR 1.8K  
CHIP RESISTOR 47K  
CHIP RESISTOR 56K  
CHIP RESISTOR 100  
RESISTOR SEMIFIXED 22KB  
RESISTOR SEMIFIXED 1KB  
RESISTOR SEMIFIXED 10KB  
RESISTOR SEMIFIXED 10KB  
RESISTOR SEMIFIXED 4.7KB  
COIL IFT 600NH 45MHZ  
COIL IFT 600NH 45MHZ  
COIL 455KHZ DETECTOR  
TRANSFORMER CHOKE  
DIP TRIMMER 10PF  
060-154-4Z  
060-102-7Z  
060-101-6Z  
060-272-7Z  
060-101-6Z  
060-683-5Z  
060-223-3Z  
060-223-3Z  
060-103-8Z  
060-103-8Z  
060-103-8Z  
060-393-3Z  
060-563-0Z  
060-223-3Z  
060-223-3Z  
060-222-2Z  
060-471-0Z  
060-123-6Z  
060-202-4Z  
060-102-7Z  
060-182-9Z  
060-473-2Z  
05B-563-7Z  
05B-101-3Z  
071-223-1  
071-102-5  
071-103-6  
071-103-6  
071-472-9  
321-014-7  
321-014-7  
320-232-2  
300-008-1  
171-013-9  
098-333-8  
860-129  
060-153-3Z  
060-564-1Z  
060-153-3Z  
060-100-5Z  
060-564-1Z  
060-223-3Z  
060-470-9Z  
060-392-2Z  
060-229-9Z  
060-153-3Z  
060-301-8Z  
060-103-8Z  
060-680-2Z  
060-100-5Z  
060-561-8Z  
060-222-2Z  
060-471-0Z  
060-100-5Z  
060-471-0Z  
060-000-8Z  
060-103-8Z  
060-471-0Z  
060-332-8Z  
060-332-8Z  
030-331-8Z  
030-121-5Z  
060-122-5Z  
060-122-5Z  
030-121-5Z  
060-474-3Z  
060-100-5Z  
060-473-2Z  
060-103-8Z  
060-223-3Z  
060-272-7Z  
060-223-3Z  
060-272-7Z  
060-103-8Z  
060-183-0Z  
060-823-5Z  
060-104-9Z  
060-102-7Z  
060-473-2Z  
060-334-0Z  
CHIP RESISTOR 10K  
CHIP RESISTOR 470  
CHIP RESISTOR 3.3K  
CHIP RESISTOR 3.3K  
FILM RESISTOR 330  
FILM RESISTOR 120  
CHIP RESISTOR 1.2K  
CHIP RESISTOR 1.2K  
FILM RESISTOR 120  
CHIP RESISTOR 470K  
CHIP RESISTOR 10  
CHIP RESISTOR 47K  
CHIP RESISTOR 10K  
CHIP RESISTOR 22K  
CHIP RESISTOR 2.7K  
CHIP RESISTOR 22K  
CHIP RESISTOR 2.7K  
CHIP RESISTOR 10K  
CHIP RESISTOR 18K  
CHIP RESISTOR 82K  
CHIP RESISTOR 100K  
CHIP RESISTOR 1K  
CHIP RESISTOR 47K  
CHIP RESISTOR 330K  
THERMISTOR CHIP 33K  
PIN CU  
X101  
CRYSTAL  
261-932-7Z  
406-194-C  
P.C.B. MAIN (SM-2450)  
Page-47-  
December 98  
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MAXON SM-2000 MOBILE  
COMPONENT PINOUT  
COMPONENT PINOUT  
= SM-2150/VHF  
= SM-2450/UHF  
Unless otherwise indicated all parts are common to the SM-2000 Series Radio.  
MANUFACTURER'S  
BASE DIAGRAM  
REFERENCE NO.  
TYPE  
PART NUMBER  
41  
40  
60  
61  
21  
20  
CPU  
IC409  
HD4074818  
80  
5
1
IC104, IC105  
IC408  
OP Amp  
LM358M  
8
4
EEPROM  
AT93C56-10S1  
1
11  
20  
IC101  
MC14519IF  
MC14053  
PLL  
10  
1
IC411,412  
Analog SW IC  
9
16  
MC14066  
MC3371D  
IC401  
IC109  
Analog SW IC  
IF IC  
8
1
8
14  
OP Amp  
KIA324F  
IC404,406,410  
7
1
8
14  
MF6CWM-100  
IC407  
Switched Cap Filter  
7
1
1
Audio AMP  
TDA2003V  
KIA7808PI  
KIA78L05F  
IC108  
3
5
1:IN  
2:GND  
3:OUT  
Regulator  
Regulator  
IC107  
1
2
3
1:OUT  
2:GND  
3:IN  
IC105,402  
3
2
1
Page-48-  
December 98  
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MAXON SM-2000 MOBILE  
COMPONENT PINOUT  
= SM-2150/VHF  
Unless otherwise indicated all parts are common to the SM-2000 Series Radio.  
= SM-2450/UHF  
MANUFACTURER'S  
PART NUMBER  
REFERENCE NO.  
BASE DIAGRAM  
3 (GATE)  
*Q351,*352  
MMBFJ309LT1  
1 (DRAIN)  
2 (SOURCE)  
Q102,103,504,821,822  
*Q122  
KTA1504S(ASG)  
BCX-18LT1  
MMBC1321(Q4)  
MMBC1321  
**Q130  
*Q106  
KTC3875S(ALG)  
KRA110S(PK)  
Q101,104,360,550-553  
C
**Q119,*139,128  
E
B
*Q353  
KRC111S  
*Q105,*407  
*Q116  
KRA104S  
MMBR951  
KRC104S(ND)  
Q121,123,127,131,134,135  
Q137,140,219,401-406,409  
*Q108,*Q354,  
**Q105,**Q407  
BFG35  
Q117  
E
C
B
KTB1367  
KTA1658  
**Q125,135  
*Q125  
B
C
E
B
C
E
B
C1971  
*Q118  
E
C
3
4
MRF5711  
**Q108  
1
2
Q113,114,  
*Q130,  
**Q110,**Q111,**Q116  
BFR92A  
C
MMBR951  
*Q800  
E
B
2SC5084  
**Q601  
Q701,702  
MMBR9426  
Page-49-  
December 98  
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MAXON SM-2000 MOBILE  
COMPONENT PINOUT  
= SM-2150/VHF  
= SM-2450/UHF  
Unless otherwise indicated all parts are common to the SM-2000 Series Radio.  
MANUFACTURER'S  
BASE DIAGRAM  
REFERENCE NO.  
Schematic  
PART NUMBER  
D103-105,121  
C
MMBV3401(4D)  
NC  
A
KRS193S(F3)  
1SS241(TY)  
D106,125,129,801,803  
D805  
C
D127  
A
BZX84C-5V  
MI402  
D807,808,810,811  
**D108  
ZENER  
A
C
MI301  
**D120  
D124  
A
IN5404  
C
C
1SV229  
D101,102  
Varicap Diode  
A
Diode Switching  
A
A
D402,*126,*128  
KDS181(A3)  
KDS226(C3)  
C
C
C
C
COM  
COMMON  
D551,552  
*D800  
**D601  
C
A
A
C
C
C
KDS184S(B3)  
MMBV105  
D401  
D701  
A
A
A
A
C
D107  
D702  
MMBD101  
MMBD101  
NC  
A
Page-50-  
December 98  
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MAXON SM-2000 MOBILE  
VOLTAGE CHARTS (SM-2150/VHF)  
VOLTAGE CHARTS (SM-2150/VHF)  
IC409  
PIN  
1
DESCRIPTION  
DATA  
TX  
0
RX  
0
PIN  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
72  
73  
74  
75  
76  
77  
78  
79  
80  
DESCRIPTION  
CH-4  
CH-8  
TX  
RX  
2
EEPROM ENABLE  
PLL ENABLE  
CHANNEL SPACING  
DATA IN  
RED L.E.D.  
BUSY  
0
0
3
5
5
MONITOR  
PTT  
5
0
5/0  
3.9  
5
4
5/0  
0
5/0  
0
5
PROG. ENABLE  
TX ENABLE  
ALERT TONE  
MF6 CLK  
CALL DETECT  
SEND UP CONTROL  
GND  
5
6
5
0
5
0
7
5/0  
5
0
0
0
8
EXT OPTION  
HOOK SW  
LOCK DET  
TEST  
5
CL  
0
CL  
0
9
0/3.7  
0
0/3.7  
0
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
0
0
5
5
0
0
X1  
5
5
VCC  
OSC1  
5
5
X2 (OPEN)  
GND  
D TO A  
0
0
2.3  
2.3  
0
2.3  
2.3  
0
0
0
OSC2  
RESET  
5/0  
5/0  
5/0  
5/0  
0
D TO A  
0
AUDIO ENABLE  
GREEN L.E.D.  
RX ENABLE  
CLK  
5
5/0  
5
TONE ENABLE  
D TO A  
CH-1  
0
0
0
0
5
CH-2  
IC411  
PIN  
RX VOLTAGE  
TX VOLTAGE  
1
0
0
2
4
3
4
5
0
6
0
0
7
0
0
8
0
2
1.9  
1.9  
1.9  
2.75  
1.2  
2.75  
PIN  
RX VOLTAGE  
TX VOLTAGE  
9
5
0
10  
5
11  
0
12  
1.9  
1.9  
13  
3.7  
4
14  
1.9  
1.9  
15  
0.5  
1.2  
16  
5
0
0
5
IC412  
IC401  
PIN  
1
TX  
RX  
0
PROGRAM  
0
PIN  
1
TX  
0
RX  
0
2
0
0
2
0
0
3
3.7  
3.7  
3.7  
3.7  
0
0
3
2
1.8  
2
4
0
0
4
2
5
5
5
0
6
GND  
GND  
GND  
5
GND  
GND  
GND  
0
6
0
0
7
7
0
SAT 1.9  
SAT 1.9  
0
8
8
2
9
9
2
10  
11  
12  
13  
14  
15  
16  
5
0
10  
11  
12  
13  
14  
0
0
0
5
5
0
5
0
0
0
0
5
0
0
0
3.8  
3.8  
0
3.6  
3.6  
0
5
5
5
5
Page-51-  
December 98  
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MAXON SM-2000 MOBILE  
VOLTAGE CHARTS (SM-2150/VHF)  
IC404  
IC407  
PIN  
1
TX UNMODE  
RX MODE  
VOICE 1.9  
VOICE 1.9  
VOICE 1.9  
5
PIN  
1
NORMAL  
OPTION  
XT2  
XT2  
XT2  
XT2  
1.9  
1.9  
1.9  
1.9  
5
1.9  
0
2
2
3
3
3.6  
0
4
4
5
1.9  
1.9  
1.9  
1.9  
1.9  
1.9  
GND  
1.9  
1.9  
1.9  
VOICE 1.9  
VOICE 1.9  
VOICE 1.9  
VOICE 1.9  
VOICE 1.9  
VOICE 1.9  
GND  
5
2
6
6
5
5
1.9  
7
7
1.9  
1.05  
5
8
8
XT2  
CLK  
GND  
CLK  
0
9
9
10  
11  
12  
13  
14  
10  
11  
12  
13  
14  
GND  
5
VOICE 1.9  
VOICE 1.9  
VOICE 1.9  
0
2
1.9  
1.9  
2
IC405  
IC410  
PIN  
1
TX  
1.93  
1.93  
1.8  
RX  
2.00  
2.00  
2.00  
0
PIN  
1
BUSY  
AUDIO  
AUDIO  
AUDIO  
5
RX  
1.9  
1.9  
1.9  
5
2
2
3
3
4
0
4
5
1.92  
1.92  
1.92  
5.00  
2.00  
2.00  
2.10  
5.00  
5
AUDIO  
AUDIO  
AUDIO  
AUDIO  
1.9  
1.9  
1.9  
1.9  
6
6
7
7
8
8
IC406  
9
AUDIO  
1.9  
PIN  
1
TX  
3.05  
1.9  
1.9  
5
RX  
AF 1.05  
1.9  
10  
11  
12  
13  
14  
AUDIO  
GND  
1.9  
GND  
1.9  
2
AUDIO  
AUDIO  
AUDIO  
3
1.9  
5
1.9  
1.9  
4
5
6
7
1.9  
1.9  
1.9  
1.9  
1.9  
1.9  
8
1.9  
1.9  
IC107 IC105 IC402  
9
1.9  
1.9  
1.9  
1.9  
PIN  
IC107  
IC105/402  
1
13.7  
8
2
0
0
3
8
5
10  
11  
12  
13  
14  
GND  
1.9  
1.9  
GND  
1.9  
1.9  
1.9  
1.9  
Page-52-  
December 98  
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MAXON SM-2000 MOBILE  
VOLTAGE CHARTS (SM-2150/VHF)  
IC109  
PIN  
BUSY  
RX (MUTE)  
1
7
7
2
3
6
6
4
5
6
6
6
6
6
7
6
6
8
OSC  
OSC  
7.2  
7.2  
7.2  
7.2  
PIN  
BUSY  
RX (MUTE)  
9
10  
0.8  
0.8  
11 12  
NOISE 2.5  
13  
7
14  
4.5  
0
15  
GND  
GND  
16  
2
AUDIO  
AUDIO  
NOISE  
0
7
2
IC101  
PIN  
RX VOLTAGE  
TX VOLTAGE  
1
0
2
5
3
5
5
4
5
5
5
5
5
6
PD  
0
7
GND  
0
8
0
2
2.5  
PIN  
RX VOLTAGE  
TX VOLTAGE  
9
5
10  
2
11  
2.7  
2.7  
12  
5
13  
3.5  
3.5  
14  
5
15  
0
16  
0
2.7  
3
5
5
0
0
PIN  
RX VOLTAGE  
TX VOLTAGE  
17  
5
18  
0
19  
0
20  
OSC  
2.3  
5
0
0
TRANSISTOR VOLTAGE CHART  
RX  
TX  
REF.NO  
Q108  
Q113  
Q114  
Q116  
Q117  
Q125  
Q106  
Q140  
Q130  
Q122  
Q121  
Q127  
Q128  
Q120  
Q118  
Q139  
B
7.5  
0.7  
3.1  
0
C
3.5  
2.5  
5
E
GND  
1.5  
2.3  
0
B
0
C
3.5  
2.5  
5
E
GND  
1.3  
2.3  
0.7  
3.1  
2
0
7
1.2  
0
0
13.72 13.7  
0
0.7  
12  
1
7.2  
12.5  
1.5  
0
GND  
13.2  
GND  
GND  
0
12  
7
2.5  
7.5  
5
GND  
GND  
0
5
0.7  
8
0
0
2.5  
8
0
8
0
7.3  
5
8
GND  
0
8.1  
0
0
5
GND  
8
13.8 GND  
0
8
0
0
0
0
13.8  
6
GND  
GND  
8
0
7.5  
9.5  
0
GND  
8
8
Page-53-  
December 98  
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MAXON SM-2000 MOBILE  
VOLTAGE CHARTS (SM-2450/UHF)  
VOLTAGE CHARTS (SM-2450/UHF)  
IC409  
PIN  
1
DESCRIPTION  
DATA  
TX  
0
RX  
0
PIN  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
72  
73  
74  
75  
76  
77  
78  
79  
80  
DESCRIPTION  
CH-4  
CH-8  
TX  
RX  
2
EEPROM ENABLE  
PLL ENABLE  
CHANNEL SPACING  
DATA IN  
RED L.E.D.  
BUSY  
0
0
3
5
5
MONITOR  
PTT  
5
0
5/0  
3.9  
5
4
5/0  
0
5/0  
0
5
PROG. ENABLE  
TX ENABLE  
ALERT TONE  
MF6 CLK  
CALL DETECT  
SEND UP CONTROL  
GND  
5
6
5
0
5
0
7
5/0  
5
0
0
0
8
EXT OPTION  
HOOK SW  
LOCK DET  
TEST  
5
CL  
0
CL  
0
9
0/3.7  
0
0/3.7  
0
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
0
0
5
5
0
0
X1  
5
5
VCC  
OSC1  
5
5
X2 (OPEN)  
GND  
D TO A  
0
0
2.3  
2.3  
0
2.3  
2.3  
0
0
0
OSC2  
RESET  
5/0  
5/0  
5/0  
5/0  
0
D TO A  
0
AUDIO ENABLE  
GREEN L.E.D.  
RX ENABLE  
CLK  
5
5/0  
5
TONE ENABLE  
D TO A  
CH-1  
0
0
0
0
5
CH-2  
IC411  
PIN  
RX VOLTAGE  
TX VOLTAGE  
1
0
0
2
4
3
4
1.9  
5
0
6
0
0
7
0
0
8
0
2
1.9  
1.9  
1.2  
2.75  
2.75  
PIN  
RX VOLTAGE  
TX VOLTAGE  
9
5
0
10  
2
11  
2.7  
2.7  
12  
5
13  
3.5  
3.5  
14  
5
15  
0
16  
3
5
5
0
0
IC412  
IC401  
PIN  
1
NORMAL  
PROGRAM  
PIN  
1
TX  
RX  
0
0
0
0
2
0
0
2
0
0
3
0
0
3
2
1
4
0
0
0
0
4
2
2
5
5
5
0
6
GND  
GND  
GND  
5
GND  
GND  
GND  
0
6
5
0
5
7
7
0
8
8
SAT  
SAT  
0
2
9
9
2
10  
11  
12  
13  
14  
15  
16  
5
0
10  
11  
12  
13  
14  
0
5
0
0
0
0
0
0
0
3.6  
3.6  
0
3.6  
3.6  
0
5
5
5
5
5
5
Page-54-  
December 98  
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MAXON SM-2000 MOBILE  
VOLTAGE CHARTS (SM-2450/UHF)  
IC404  
IC407  
PIN  
1
TX UNMODE  
RX MODE  
VOICE  
VOICE  
VOICE  
5
PIN  
1
NORMAL  
1.9  
OPTION  
XT2  
XT2  
XT2  
XT2  
1.9  
1.9  
1.9  
1.9  
5
2
2
0
3
3
0
4
4
3
5
1.9  
1.9  
1.9  
1.9  
1.9  
1.9  
GND  
1.9  
1.9  
1.9  
VOICE  
VOICE  
VOICE  
VOICE  
VOICE  
VOICE  
GND  
5
2
6
6
5
1.9  
5
1.9  
7
7
8
8
0
XT2  
CLK  
GND  
CLK  
0
9
9
5
GND  
10  
11  
12  
13  
14  
10  
11  
12  
13  
14  
5
0
2
2
VOICE  
VOICE  
VOICE  
1.9  
1.9  
IC405  
IC410  
PIN  
1
TX  
1.93  
1.93  
1.8  
RX  
2.00  
2.00  
2.00  
0
PIN  
1
BUSY  
AUDIO  
AUDIO  
AUDIO  
5
RX  
1.9  
1.9  
1.9  
5
2
2
3
3
4
0
4
5
1.92  
1.92  
1.92  
5.00  
2.00  
2.00  
2.10  
5.00  
5
AUDIO  
AUDIO  
AUDIO  
AUDIO  
1.9  
1.9  
1.9  
1.9  
6
6
7
7
8
8
IC406  
9
AUDIO  
1.9  
PIN  
1
TX  
RX  
AF  
10  
11  
12  
13  
14  
AUDIO  
GND  
1.9  
GND  
1.9  
2
1.9  
1.9  
5
1.9  
1.9  
AUDIO  
AUDIO  
AUDIO  
3
1.9  
1.9  
4
1.9  
5
6
1.9  
1.9  
1.9  
1.9  
7
1.9  
1.9  
IC107 IC105 IC402  
8
1.9  
1.9  
PIN  
IC107  
IC105/402  
1
13.2  
5
2
0
0
3
8
8
9
10  
11  
12  
13  
14  
1.9  
GND  
1.9  
1.9  
GND  
1.9  
1.9  
1.9  
1.9  
1.9  
Page-55-  
December 98  
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MAXON SM-2000 MOBILE  
VOLTAGE CHARTS (SM-2450/UHF)  
IC109  
PIN  
BUSY  
RX (MUTE)  
1
7
7
2
3
6
6
4
5
6
6
6
6
6
7
6
6
8
OSC  
OSC  
7.2  
7.2  
7.2  
7.2  
PIN  
BUSY  
RX (MUTE)  
9
10  
0.8  
0.8  
11  
12  
13  
7
14  
0
15  
GND  
GND  
16  
2
AUDIO  
AUDIO  
NOISE 0.6  
NOISE 1.8  
7
8
2
IC101  
PIN  
VOLTAGE  
1
0
2
5
3
5
4
5
5
6
PD  
7
GND  
8
0
5
PIN  
VOLTAGE  
PIN  
9
10  
2
11  
2
12  
5
13  
OSC  
14  
5
15  
0
16  
0
TEST  
17  
18  
19  
20  
VOLTAGE  
5
0
0
OSC  
TRANSISTOR VOLTAGE CHART  
RX  
TX  
REF.NO  
Q108  
Q110  
Q111  
Q113  
Q114  
Q116  
Q117  
Q125  
Q106  
Q140  
Q119  
Q130  
Q122  
Q121  
Q127  
Q128  
B
C
E
0.6  
B
1.2  
0.6  
3.6  
0.7  
3.1  
1.5  
0.7  
12  
2
C
3.5  
1.8  
4.3  
2.5  
5
E
0.6  
1.2  
0.6  
3.6  
0.7  
3.1  
3.5  
1.8  
4.3  
2.5  
5
GND  
2
GND  
2
GND  
2.3  
GND  
2.3  
1.2  
7.5  
7.5  
12.5  
5
GND  
13.2  
1.4  
2
5
5
1.4  
0
5
0
GND  
8
0
8
0.5  
7
5
6.7  
0
6.8  
GND  
5
0
0
8
GND  
8
Page-56-  
December 98  
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MAXON SM-2000 MOBILE  
TROUBLE SHOOTING CHART (SM-2000)  
TROUBLE SHOOTING CHART (SM-2000)  
Status Indications & Audible Tones  
STATUS  
DESCRIPTION  
Power on ready  
Busy  
LED COLOR  
AUDIBLE TONE  
N/A  
Melody  
Yellow  
N/A  
Correct Tone  
Transmit  
Green  
N/A  
NORMAL  
Red  
N/A  
Scan  
Green, Flashing  
Yellow, Flashing  
N/A  
N/A  
Busy Lock  
Single Tone  
Single Tone  
Four Tone, Repeated  
Single Tone Repeated  
Double Tone Repeated  
Three Tone Repeated  
Time Out Timer  
Battery Low  
EEPROM Error  
PLL Error  
Filtering Error  
WARNING  
ERROR  
Red, Flashing  
Red, Flashing  
Red, Flashing  
Red, Flashing  
Unit Does Not Program  
1. Defective Programming Lead  
2. Wrong Programming Mode  
3. Defective MIC Connector  
4. Defective IC412  
Unit Does Not Work  
1. Open DC fuse in Power Cable  
2. Defective Volume Switch  
3. Defective Regulator IC107, 105, 402  
4. Broken DC Cable  
No Output from Speaker  
Squelch Does Not Work  
1. Defective internal speaker and external jack  
2. Defective IC108  
3. Defective VR801  
1. Wrong alignment of squelch resistor RV103  
2. Defective IC109  
3. Defective CPU IC409  
No Sub Audio Decode  
CTCSS/DCS  
1. Wrong Programming  
2. Defective Switch Filter IC406 (MF-6)  
3. Defective CPU IC409  
Page-57-  
December 98  
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MAXON SM-2000 MOBILE  
TROUBLE SHOOTING CHART (SM-2000)  
No TX  
1. Defective MIC  
2. Defective CPU IC409  
3. Defective IC412  
No TX Power  
1. Defective TX enable Q122  
2. Defective APC Control Circuit Q125  
3. Defective TX Power Buffer AMP Q116 and Q117  
4. Defective TX Power Amp (SM-2150) Q118,Q120  
5. Defective TX Power Module (SM-2450) IC103  
6. Defective ANT SW D108 and D120  
7. Defective ANT Connector  
Over Power  
1. Programming  
2. Q125 Short  
3. Defective D107 and APC Circuit  
Low TX Power Output  
1. Wrong Programming  
2. Defective TX AMP (SM-2150) Q116 , Q117 , Q118, Q120 and D108  
3. Defective TX AMP (SM-2450) Q116 , Q117 , IC103 , and D108  
4. Defective Antenna Connector  
No Modulation  
1. Defective MIC  
2. Defective Analog SW IC412 and IC411  
3. Defective 300Hz HPF IC410  
4. Defective MIC AMP and Splatter Filter IC404  
5. Defective Audio Buffer IC405  
6. Wrong Alignment of RV402  
7. Defective Analog IC401  
No Encode of CTCSS/DCS  
1. Wrong Programming  
2. Defective CPU IC409  
3. Defective IC407 and IC411  
No Sensitivity  
1. Defective Antenna Switch D108 , D120 , and D121  
2. Defective Front-End Module  
3. Defective DBM IC102  
4. Defective 45MHz IF Filter CF101  
5. Defective IF IC109  
Wrong Frequency  
1. Wrong Alignment of 12.8MHz TCXO  
2. Wrong Programming  
Page-58-  
December 98  
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REPLACEMENT MODULE SCHEMATICS  
R706  
47K  
TH703  
150K  
TH701  
10K  
4
R710  
2.2K  
R713  
47K  
R708  
47K  
R714  
2.2K  
4
3
L804  
4T  
D702  
MMBV109  
C816  
0.001  
R801  
56K  
2
C813  
33P  
D701  
MMBV  
105  
6
5
C802  
11P  
C816  
7P  
C815  
15P  
C813  
18P  
C808  
20P  
C806  
7P  
C805  
7P  
C803  
8P  
C819  
6.8P  
C818  
6.8P  
R804  
180  
(470)  
C821  
27P  
C810  
0.001  
X701  
R801  
6.8K  
C705  
100pF  
R702  
12.8MH  
C821  
270P  
RF OUT  
IN  
C817  
56P  
L804  
6T  
LK701  
R800  
820  
R704  
6
5
1
2
Q702  
MMBR9426  
L800  
6T  
Q800  
MMBR951  
Q801  
2SC5084  
C807  
33P  
C803  
33P  
L802  
6T  
C805  
6P  
C811  
100P  
Q701  
MMBR9426  
L805  
6T  
L806  
6T  
C800  
560P  
R705  
47K  
R707  
47K  
L803  
6T  
R701  
R703  
C802  
100P  
C822  
18P  
L806  
4T  
C817  
18P  
L805  
4T  
C814  
12P  
C820  
N/A  
C804  
20P  
C809  
20P  
C807  
N/A  
L802  
4T  
1
2
C702  
100pF  
D801  
KDS226  
C703  
91pF  
C704  
180pF  
C822  
39P  
C818  
100P  
C815  
150P  
C806  
C804  
C814  
33P  
R715  
2.2K  
D800  
KDS226  
C801  
39P  
C812  
39P  
C706  
220pF  
R709  
39K  
C824  
4P  
R711  
4.7K  
C812  
470P  
L801  
4T  
C823  
18P  
L803  
4T  
C801  
10P  
L807  
4T  
R802  
100  
TH702  
33K  
C701  
100pF  
TC701  
20pF  
R712  
39K  
R803  
2.2  
R802  
3.3K  
C808  
100P  
L801  
6T  
RX 5V  
1
4
3
3
SM-2150/VHF FRONT-END  
770-110-0002 Rev. B  
SM-2000 TCXO  
770-100-0002 Rev. C  
SM-2450/UHF FRONT-END  
770-110-0001 Rev. B  
(VHF Band 2 shown)  
(UHF Band 2 shown)  
Note 1: Schematics are for reference only. Reference designators and part values may not reflect product configuration.  
Note 2: Refer to band chart for specific Front-End PCB assemblies.  
Page-59-  
December 98  
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SW1  
SW2  
SP  
CORD901  
SP1  
4 OHM  
4W  
C815  
470P  
B+ (RED)  
N/C  
N/C  
1
5
GROUND  
AUDIO  
(GREEN)  
(WHITE)  
GND  
3
2
6
TX  
(YELLOW)  
VRT2  
AUDIO  
GND (SHIELD)  
(BLACK)  
4
MON/HOOK  
MIC901  
+
-
CURRENT LIMITER  
R822  
4.7K  
Q821  
KRA1504S  
VR801  
10KR  
C808  
47P  
C903  
470P  
TEL  
PLUG  
C821  
0.001  
TX  
RX  
MIC  
R821  
22  
C823  
10/25(E)  
SW POWER  
Q822  
KRA1504S  
CS  
PTT  
SWITCH  
PTT  
MIC  
HANGER  
13.8  
PTT  
MIC  
6
5
4
3
2
1
CON801  
MIC  
L901  
1MH  
HANGER  
CS  
HOOK  
C801-805  
47P  
C901  
0.001(M)  
D808  
5.1V  
D810  
5.1V  
D811  
5.1V  
D807  
5.1V  
VRT 1  
LK1  
TX/CALL/BUSY  
LED 5  
C807  
47P  
LED3  
LED4  
LED1  
LED2  
LK4  
LK2  
LK3  
R801  
470  
SM-2000  
SW4  
MONITOR  
SW3  
AUX  
MA-4472 MICROPHONE SCHEMATIC  
770-090-0003  
8V  
MONITOR  
LED GRN  
LED RED  
CALL  
C809  
47P  
C806  
47P  
D801  
KDS193  
D804  
KDS184  
BCD 1  
BCD 8  
BCD 4  
BCD 2  
GND  
SW405  
4CH  
D803  
KDS193  
3CH  
2CH  
1CH  
D802  
KDS193  
CH SW  
SM-2000  
CONTROL HEAD SCHEMATIC  
770-050-0003 Rev. B  
Page-60-  
December 98  
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REVISIONS  
DESCRIPTION  
BY  
REV  
A
CHG  
RELEASED TO MANUFACTURING  
JPW  
9/96  
V0100003.CDR  
CORELDRAW  
09-10-96  
R
UNLESS OTHERWISE NOTED  
DIMENSIONS ARE IN MILLIMETERS  
TOLERENCES:  
A World of Communications  
10828 NW Air World Drive  
Kansas City, Missouri 64153  
HOLES  
ANGLES  
LINEAR  
+
+
.XX  
+
-
NA  
-
NA  
-
.XXX  
NA  
+
TITLE  
-
SM-2000 BLOCK DIAGRAM  
DATE  
DATE  
DATE  
DWN  
CHK  
DOCUMENT  
NUMBER  
SIZE  
060-010-0003  
SHEET  
B
SCALE  
PROD ENGR  
OF  
NA  
1
1
Page-61-  
December 98  
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REVISIONS  
DESCRIPTION  
BY  
REV  
A
CHG  
RELEASED TO MANUFACTURING  
JPW  
9/96  
4/97  
B
C
D
ECO 97014 Change to Sheet 1, Digital Section Onl  
ECO 97020  
JPW  
JPW  
JPW  
4/97  
ECO 98017 Change to Sheet 2, RF Section Onl  
11/98  
DIGITAL.DWG  
AUTOCAD R13c4  
11-18-98  
R
UNLESS OTHERWISE NOTED  
DIMENSIONS ARE IN MILLIMETERS  
TOLERENCES:  
A World of Communications  
10828 NW Air World Drive  
Kansas City, Missouri 64153  
HOLES  
ANGLES  
LINEAR  
+
+
.XX  
+
-
NA  
-
NA  
-
.XXX  
NA  
+
TITLE  
SM-2000  
MAIN BOARD SCHEMATIC  
(DIGITAL SECTION)  
-
DATE  
DATE  
DATE  
DWN  
CHK  
DOCUMENT  
NUMBER  
SIZE  
770-000-0001 VHF  
770-000-0002 UHF  
SHEET  
B
SCALE  
PROD ENGR  
OF  
NA  
1
2
Page-62-  
December 98  
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REVISIONS  
DESCRIPTION  
BY  
REV  
A
CHG  
RELEASED TO MANUFACTURING  
JPW  
9/96  
4/97  
B
C
D
ECO 97014 Change to Sheet 1, Digital Section Onl  
ECO 97020  
JPW  
JPW  
JPW  
4/97  
ECO 98017 Change to Sheet 2, RF Section Onl  
11/98  
770-000-0001re D.DWG  
AUTOCAD R13c4  
12-05-98  
R
UNLESS OTHERWISE NOTED  
DIMENSIONS ARE IN MILLIMETERS  
TOLERENCES:  
A
orld of Communications  
10828 NW Air World Drive  
Kansas City, Missouri 64153  
HOLES  
ANGLES  
LINEAR  
+
+
.XX  
+
-
NA  
-
NA  
-
.XXX  
NA  
+
TITLE  
-
SM-2150/VHF  
DATE  
DATE  
DATE  
RF SCHEMATIC DIAGRAM  
DWN  
CHK  
DOCUMENT  
NUMBER  
SIZE  
770-000-0001  
SHEET  
B
SCALE  
PROD ENGR  
OF  
NA  
2
2
Page-63-  
December 98  
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REVISIONS  
DESCRIPTION  
BY  
REV  
A
CHG  
RELEASED TO MANUFACTURING  
JPW  
9/96  
R
UNLESS OTHERWISE NOTED  
DIMENSIONS ARE IN MILLIMETERS  
TOLERENCES:  
A
orld of Communications  
10828 NW Air World Drive  
Kansas City, Missouri 64153  
HOLES  
ANGLES  
LINEAR  
+
+
.XX  
+
-
NA  
-
NA  
-
.XXX  
NA  
+
TITLE  
-
SM-2450/UHF  
DATE  
DATE  
DATE  
RF SCHEMATIC DIAGRAM  
DWN  
CHK  
DOCUMENT  
NUMBER  
SIZE  
770-000-0002  
SHEET  
B
SCALE  
PROD ENGR  
OF  
NA  
2
2
Page-64-  
December 98  
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SPKR  
LED4  
LED3  
D804  
D801  
D805  
LED2  
LED1  
R801  
C807  
C809  
SW4  
C283  
SW3  
LED5  
CON801  
SM-2000 CONTROL HEAD  
SM-2000 CONTROL HEAD  
650-050-0003  
650-050-0003  
Page-65-  
December 98  
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SM-2150/VHF MAIN BOARD ASSY.  
SM-2150/VHF MAIN BOARD ASSY.  
650-000-0001  
650-000-0001  
Page-66-  
December 98  
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R181  
R219  
D127  
L227  
RV105  
RV104  
C187  
C186  
Q135  
L228  
Q219  
TH101  
C185  
C184  
Q134  
R210  
ANT  
R175  
L226  
R176  
C127  
R117  
C133  
C134  
C141  
Q108  
C136  
L103  
R122  
C137  
D102  
D101  
R128  
L104  
C279  
R123  
R124  
R126  
C140  
IC102  
C218  
TC101  
R115  
R127  
C143  
RV101  
C238  
TP1  
L107  
R106  
C114  
C210  
R108  
R111  
R103  
PWR2  
Q103  
Q102  
R107  
R105  
R104  
C110  
C108  
FB1  
C146  
C142  
R113  
C121  
PLL1  
C239  
C558  
C407  
Q553Q554  
R556  
L113  
Q552  
Q550  
C409  
R405  
R402  
R404  
C405 IC405  
C147  
R403  
R551  
C550  
Q551  
R559  
C554  
RV403  
R458  
R142  
R143  
C424  
IC408  
C437  
IC411  
IC401  
IC412  
IC407  
CON403  
CON401  
R457  
LK3  
C250  
C568  
C438  
C404  
C428  
R462  
R465  
X401  
IC402  
R464  
R463  
R434  
Q407  
R437  
Q406  
C152  
PWR1  
C435  
Q405  
IC409  
R460  
R461  
R435  
D124  
C222  
C221  
R433  
T104  
C367  
LK11  
LK5  
RV402  
LK12  
LK13  
+
R444  
C454  
C453  
PWR  
C442  
R411 R416  
LK9  
C232  
R453  
C443  
R454  
R456  
C464  
C445  
R455  
-
R415  
C226  
R448  
C417  
C403  
R446  
C447  
R459  
C233  
CON  
LK15  
R148  
C224  
SM-2450/UHF MAIN BOARD ASSY.  
SM-2450/UHF MAIN BOARD ASSY.  
650-000-0002 Rev. C  
650-000-0002 Rev. C  
Page-67-  
December 98  
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SM-2000  
EXPLODED VIEW  
Page-68-  
December 98  
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SM-2150/VHF EXPLODED VIEW PARTS LIST  
SM-2450/UHF EXPLODED VIEW PARTS LIST  
REF #  
1
PART #  
801-282-A  
905-510  
795-654  
826-137  
826-120  
650-346  
650-335  
661-701  
662-901  
894-650  
895-095  
611-388  
895-040  
420-709-9  
650-050-0003  
420-108-4A  
623-034  
853-078  
752-732  
613-174  
622-039  
895-044  
702-416-AB  
623-760  
427-411-4  
427-411-4A  
772-181  
723-844  
895-047  
613-040-S  
650-000-0001  
772-298  
752-729  
772-243  
895-041  
421-677-7  
772-179  
613-755-SF  
895-043  
723-823  
612-289  
504-367-B  
719-020  
895-075  
660-449  
613-764  
893-700  
613-369  
508-085-A  
660-449  
662-310  
613-299  
723-834  
600-051  
661-605  
662-606  
625-007  
772-241  
772-242  
772-132-A  
752-769  
895-247  
662-305  
DESCRIPTION  
QTY  
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
3
1
1
1
2
1
1
2
1
1
1
2
1
12  
1
1
1
1
1
1
1
4
1
1
6
1
1
4
4
4
4
1
1
2
2
2
1
2
2
2
2
1
1
1
1
1
4
REF #  
1
PART #  
801-282-A  
905-510  
795-654  
826-137  
826-120  
650-346  
650-335  
661-701  
662-901  
894-650  
895-095  
611-388  
895-040  
420-709-9  
650-050-0003  
420-108-4A  
623-034  
853-078  
752-732  
613-174  
622-039  
895-044  
702-416-AB  
623-760  
427-411-4  
427-411-4A  
772-181  
723-844  
895-047  
613-040-S  
650-000-0002  
771-989  
752-729  
772-243  
895-041  
421-677-7  
772-179  
613-755-SF  
895-043  
723-823  
612-289  
504-367-B  
719-020  
895-075  
660-449  
613-764  
893-700  
613-369  
508-085-A  
660-449  
662-310  
613-299  
723-834  
600-051  
661-605  
662-606  
625-007  
772-241  
772-242  
772-132-A  
752-769  
895-247  
662-305  
DESCRIPTION  
QTY  
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
3
1
1
1
2
1
1
2
1
1
1
2
1
11  
1
1
1
1
1
1
1
4
1
1
6
1
1
4
4
4
4
1
1
2
2
2
1
2
2
2
2
1
1
1
1
1
4
E.S.C NORYL N190J-7002  
E.S.C NORYL N190J-7002  
2
FELT 30-R16.5 (2) XT0.3 FELT BLK  
OVERLAY LEXAN T0.5  
2
FELT 30-R16.5 (2) XT0.3 FELT BLK  
OVERLAY LEXAN T0.5  
3
3
4
KNOB (FOR VOL) ABS 94HB BLK  
KNOB (FOR CH) ABS 94HB BLK  
NUT RING (FOR VOL) M7X0.75 (P) &9.9 BSBM  
NUT RING (FOR CH) M9X0.75 (P) &11 BSBM  
WASHER (FOR VOL) T0.5 SPC  
4
KNOB (FOR VOL) ABS 94HB BLK  
KNOB (FOR CH) ABS 94HB BLK  
NUT RING (FOR VOL) M7X0.75 (P) &9.9 BSBM  
NUT RING (FOR CH) M9X0.75 (P) &11 BSBM  
WASHER (FOR VOL) T0.5 SPC  
5
5
6
6
7
7
8
8
9
WASHER (FOR CH) 13X9.3XT0.5 SPC  
RING (FOR VOL) &10X&6.9XT0.8 SILI.RUBB BLK  
RING (FOR CH) &9.3X&12.5 CR BLK  
(+) MACHINE SCREW (FH) M3X8 (+) FH BLK  
KEY PAD SILICONE RUBBER  
9
WASHER (FOR CH) 13X9.3XT0.5 SPC  
RING (FOR VOL) &10X&6.9XT0.8 SILI.RUBB BLK  
RING (FOR CH) &9.3X&12.5 CR BLK  
(+) MACHINE SCREW (FH) M3X8 (+) FH BLK  
KEY PAD SILICONE RUBBER  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
JACK MODULAR 1130-662  
JACK MODULAR 1130-662  
CONTROL HEAD P.C.B. ASSY.  
CONTROL HEAD P.C.B. ASSY.  
SPEAKER 4 OHM 5.0W 71MM PB7401A3Y26  
(+) TAPPING SCREW (PH) T3X6-1S (+) PH ZN-PLAT  
POST BSBM NI-PLAT  
SPEAKER 4 OHM 5.0W 71MM PB7401A3Y26  
(+) TAPPING SCREW (PH) T3X6-1S (+) PH ZN-PLAT  
POST BSBM NI-PLAT  
PLATE (ESC MTG) SPC T2  
PLATE (ESC MTG) SPC T2  
(+) MACHINE SCREW (FH) M3X5 (+) FH NI-PLAT  
(+) TAPPING SCREW (BH) T2X6-1S (+) BH ZN-PLAT  
GASKET (ESC) CR BLK  
(+) MACHINE SCREW (FH) M3X5 (+) FH NI-PLAT  
(+) TAPPING SCREW (BH) T2X6-1S (+) BH ZN-PLAT  
GASKET (ESC) CR BLK  
FRAME ALDC12 (SM-2450)  
FRAME ALDC12 (SM-2450)  
(+) TAPPING SCREW (BH) T3X18-2S (+) BH NI-PLAT  
WIRE EMI GASKET 43SM15 (SM-2450)  
WIRE EMI GASKET 43SM20 (SM-2450)  
SHIELD CAN SPTE T0.3  
(+) TAPPING SCREW (BH) T3X18-2S (+) BH NI-PLAT  
WIRE EMI GASKET 43SM15 (SM-2450)  
WIRE EMI GASKET 43SM20 (SM-2450)  
SHIELD CAN SPTE T0.3  
BRACKET TR SK5 T0.5 NI-PLAT  
GASKET (EXT JACT) CR BLK  
BRACKET TR SK5 T0.5 NI-PLAT  
GASKET (EXT JACT) CR BLK  
(+) MACHINE SCREW (PH) M3X6 (+) PH ZN-PLAT 1  
MAIN P.C.B. ASSY. SM-2150/VHF  
SHIELD COVER SPTE T0.5  
(+) MACHINE SCREW (PH) M3X6 (+) PH ZN-PLAT 1  
MAIN P.C.B. ASSY. SM-2450/UHF  
SHIELD COVER SPTE T0.5  
CLIP (FOR TR) SUS304 T0.5  
CLIP (FOR TR) SUS304 T0.5  
SHIELD CAN NSP T0.3  
SHIELD CAN NSP T0.3  
RING CR BLK  
RING CR BLK  
CONNECTOR BOX SOCKETBCS-110-P-D-HE  
SHIELD CASE (FOR VCO)  
CONNECTOR BOX SOCKETBCS-110-P-D-HE  
SHIELD CASE (FOR VCO)  
(+) MACHINE SCREW (PH) M3X7 (+) PH NI-PLAT  
GASKET (BRKT) CR BLK  
(+) MACHINE SCREW (PH) M3X7 (+) PH NI-PLAT  
GASKET (BRKT) CR BLK  
BRACKET ALDC12  
BRACKET ALDC12  
(+) MACHINE SCREW (BH) M2X5 (+) BH BLK  
2P PLUG ASS’Y SH-50101 (SM-2450)  
COVER TOP ALDC12  
(+) MACHINE SCREW (BH) M2X5 (+) BH BLK  
2P PLUG ASS’Y SH-50101 (SM-2450)  
COVER TOP ALDC12  
RUBBER WASHER &6.2X&3.1XT0.5 N.B.R BLK  
WASHER 6X3.2X0.5T SPC NI-PLAT  
(+) MECHINE SCREW (PH) M3X20 (+) PH SUS  
FOOT &11X5 RUBB.STIC.  
RUBBER WASHER &6.2X&3.1XT0.5 N.B.R BLK  
WASHER 6X3.2X0.5T SPC NI-PLAT  
(+) MECHINE SCREW (PH) M3X20 (+) PH SUS  
FOOT &11X5 RUBB.STIC.  
(+) MACHINE SCREW (BH) M3X15 (+) BH ZN-PLAT  
MIC BRACKET ASS’Y  
(+) MACHINE SCREW (BH) M3X15 (+) BH ZN-PLAT  
MIC BRACKET ASS’Y  
WASHER 6X3.2X0.5T SPC NI-PLAT  
WASHER SPRING M3 NI-PLAT  
(+) MACHINE SCREW (BH) M3X6 (+) BH NI-PLAT  
BRACKET SPC T2.0  
WASHER 6X3.2X0.5T SPC NI-PLAT  
WASHER SPRING M3 NI-PLAT  
(+) MACHINE SCREW (BH) M3X6 (+) BH NI-PLAT  
BRACKET SPC T2.0  
SECURING SCREW M6X9 (P:1) BLK  
WASHER FLAT M6 ZN-PLAT  
SECURING SCREW M6X9 (P:1) BLK  
WASHER FLAT M6 ZN-PLAT  
WASHER SPRING M6 ZN-PLAT  
(+) TAPPING SCREW (TH) T5X12-1S (+) TH ZN-PLAT  
SHIELD PLATE SPTE T0.3  
WASHER SPRING M6 ZN-PLAT  
(+) TAPPING SCREW (TH) T5X12-1S (+) TH ZN-PLAT  
SHIELD PLATE SPTE T0.3  
SHIELD CAN SPTE T0.5  
SHIELD CAN SPTE T0.5  
SHIELD CAN (FR-P) NSP T0.2  
SHIELD CAN (FR-P) NSP T0.2  
FINGER STRIP SUS304 T0.3  
FINGER STRIP SUS304 T0.3  
CAP (FOR EXT. JACK)  
CAP (FOR EXT. JACK)  
WASHER SPRING M3 ZN-PLAT  
WASHER SPRING M3 ZN-PLAT  
Page-69-  
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