USER INSTRUCTIONS
MODEL MCE325
PROGRAMMABLE USER STATION
9350-6464-00 Rev J, 7/2001
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RETURN SHIPPING INSTRUCTIONS
PROCEDURE FOR RETURNS
If a repair is necessary, contact the dealer where this unit was purchased.
If repair through the dealer is not possible, obtain a RETURN AUTHORIZATION from:
Customer Service Department
Telex Communications, Inc.
Telephone: (877) 863-4169
Fax: (800) 323-0498
DO NOT RETURN ANY EQUIPMENT DIRECTLY TO THE FACTORY WITHOUT FIRST OBTAINING A
RETURN AUTHORIZATION.
Be prepared to provide the company name, address, phone number, a person to contact regarding the repair, the type
and quantity of equipment, a description of the problem and the serial number(s).
SHIPPING TO MANUFACTURER FOR REPAIR OR ADJUSTMENT
All shipments of RTS products should be made via United Parcel Service or the best available shipper, prepaid. The
equipment should be shipped in the original packing carton; if that is not available, use any suitable container that is
rigid and of adequate size. If a substitute container is used, the equipment should be wrapped in paper and surrounded
with at least four inches of excelsior or similar shock-absorbing material. All shipments must be sent to the following
address and must include the Return Authorization.
Factory Service Department
Telex Communications, Incorporated
West 1st Street
Blue Earth, MN 56013 U.S.A.
Upon completion of any repair the equipment will be returned via United Parcel Service or specified shipper collect.
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End-User License Agreement for Telex® Software
IMPORTANT - Please read this document carefully before using this product.
THIS DOCUMENT STATES THE TERMS AND CONDITIONS UPON WHICH TELEX COMMUNICATIONS,
INC. (the “COMPANY”) OFFERS TO LICENSE THE INSTALLED SOFTWARE OR PROGRAM (the “SOFT-
WARE”) FOR USE WITH THE PRODUCT IN WHICH IT WAS INSTALLED. YOU ARE AGREEING TO
BECOME BOUND BY THE TERMS OF THIS AGREEMENT. IF YOU DO NOT AGREE TO THE TERMS OF
THIS AGREEMENT, DO NOT USE THIS PRODUCT. PROMPTLY RETURN THE PRODUCT TO THE
PLACE WHERE YOU OBTAINED IT FOR A FULL REFUND.
The installed software as supplied by the Company is licensed, not sold, to you for use only under the terms of this
license, and the Company reserves all rights not expressly granted to you. You own the product or other media on or
in which the Software is originally or subsequently recorded or fixed, but the Company retains ownership of all
copies of the Software itself.
1. License: This license allows you to use the Software for internal purposes only on a single product in which it
was installed.
2. Restrictions: (a) You may not market, distribute or transfer copies of the Software to others or electronically
transfer or duplicate the Software. YOU MAY NOT REVERSE ENGINEER, DECOMPILE, DISASSEMBLE,
MODIFY, ADAPT, TRANSLATE, RENT, LEASE OR LOAN THE SOFTWARE OR CREATE DERIVATIVE
WORKS BASED ON THE SOFTWARE OR ANY ACCOMPANYING WRITTEN MATERIALS. (b) The Soft-
ware and the accompanying written materials are copyrighted. Unauthorized copying of the Software, including
portions thereof or the written materials, is expressly forbidden. (c) You understand that the Company may update
or revise the Software and in so doing incurs no obligation to furnish such updates to you.
3. Limited Warranty: The Company does not warrant that the operation of the Software will meet your require-
ments or operate free from error. The Company DISCLAIMS ALL OTHER WARRANTIES AND CONDITIONS
EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS.
4. Limited Liability: The liability of the Company for any claims arising out of this License based upon the Soft-
ware, regardless of the form of action, shall not exceed the greater of the license fee for the Software or $50.
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TABLE OF CONTENTS
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Front Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Channel Selector and Operation Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Volume Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Sidetone Nulling Trimmers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Connections, Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Panel Microphone Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Rear Panel Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Intercom Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
External Program Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Speaker Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Auxiliary Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Mounting Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
MCE325 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Microphone Preamplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Headphone Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Speaker Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Power and Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
MCS325 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Internal Programming and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Intercom Line-Channel Configurations (DS1-DS3, J6, J7, J19 & J20) . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Front Panel Setup Mode Lock-out (DS4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
ISO (DS5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Remote Talk-off (DS7). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
VOX (DS8). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Program Assignment – IFB Option (J4, J5, J16-J18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Balanced/Unbalanced Dynamic Microphone Selection (J24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Headphone Sidetone Trimmer Adjustment (R37) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Speaker Dim Adjustment (R157) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
AC Power and Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Intercom Lines J8, J9, and J10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Connector Pin-outs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Four-wire Output Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Program Inputs, J14 and J15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
External Speaker, J27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Auxiliary Connector, J22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Four-Wire Channel A and B Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Key outputs – Expanded IFB Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Remote Microphone Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
ISO Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
External Headset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
External Electret Microphone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
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Unswitched Microphone Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
External DC Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Remote Speaker Mute Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Front Panel Headset Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Headset Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Headset Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Momentary/Latching Button action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Channel Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Panel Mic/Headset Mic Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Microphone On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Speaker On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Volume Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Front Panel Sidetone Nulling Trimmer Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Sending and Receiving Call Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Using the Talk-Off Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Front Panel Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Activating Setup Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Menu Selection/Ending Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Submenus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Channel ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Four-channel Listen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Call Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Button Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Latch Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Instant Mic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Factory Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Corrective Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Front Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Test and Adjustment Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Power Supply Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Initial Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Keying Output Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
USMB (Un-Switched Microphone Balanced) Frequency Response and Level Check . . . . . . . . . . . . . . . . . .4-4
Frequency Response and Level Check, Mic to Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Four-Channel, Two-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Two-Channel, Four-Wire Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Sidetone Null Test and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
True Sidetone Adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6
Level and Frequency Response Check, Intercom Channel to Headphone . . . . . . . . . . . . . . . . . . . . . . . .4-6
Level and Frequency Response Check, Intercom Channel to Speaker. . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Level and Frequency Response, Program to Headphones and Speaker . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Program A to Left Headphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Program B to Right Headphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
Program to Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
IFB Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
IFB B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
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IFB A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Level and Frequency Response Check, Four-Wire Input to Headphone . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Four-Wire A Input to Left Headphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Four-Wire B input to Right Headphone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Panel Mic to Channel Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Carbon Mic to Channel Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
VOX Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Mic Kill Receive Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Mic Kill Transmit Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Call Transmit Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Call Receive Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
ISO Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Remote Mic Switch Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Program Lockout Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Noise Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Packaging Assembly (9000-6464-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Final Assembly, MCE325 (9010-6464-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Front Panel Assembly (9020-6261-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Back Panel Assembly (9020-6262-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Heatsink Assembly (9020-6324-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Main PC Board Assembly (9030-6245-01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
PC Board Assembly, Front Panel (9030-6246-00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
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S E C T I O N
C
HAPTER1
DESCRIPTION & SPECIFICATIONS
Description
General
The MCE325 is a four-channel, programmable intercom station. It may be used as a headset
station or, with the addition of the MCS325 Modular Speaker, as a speaker station. It may be
mounted in a console or equipment rack via optional mounting kits.
The MCE325 can be used with either two-wire or four-wire intercom lines, or a combination of
both. In this manual and in the labeling on the MCE325, references to channels 1, 2, 3, and 4
indicate two-wire lines; references to four-wire A and four-wire B indicate four-wire lines.
The MCE325 can be interfaced to a variety of external devices including external program
sources, two-way radios, paging systems, and satellite circuits. Some typical applications are
Features
Features of the MCE325 include:
• Call Signaling: Call signaling is accomplished using an inaudible (20 kHz) signal to activate a
call indicator LED.
• Remote “talk-off”: Active, unattended remote station microphones may be deactivated by
momentarily injecting an inaudible (24 kHz) signal into the corresponding intercom line. The
MCE325 can send and receive “talk-off” signals.
• VOX circuit: The MCE325 may be programmed for voice activation of the microphone.
• Simple IFB: Program audio assigned to a channel is interrupted during talk.
• External device keying: External devices, such as two-way radios, speaker mute relays, or
paging systems may be activated through key outputs at the auxiliary connector on the rear
panel. The key outputs may also be used to expand the simple IFB function, allowing any one
of a number of MCE325 stations to interrupt the program source and talk on the line.
• Microphone limiter: The microphone preamplifier circuit contains a limiter, which helps to
equalize voice levels.
• Fully programmable: Retains programming even when power is shut off.
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Front Panel Features
Channel Selector and Operation Buttons
These buttons have two modes of operation: standard operating mode and program, or setup,
mode. The printing on the face of each button indicates its function in standard operating mode;
printing under each button indicates its setup mode function. (See Section 3 for operation and
programming instructions.) An LED located above each button provides status information.
The MCE325 is factory pre-programmed for two-channel operation, with each channel having
one talk and one listen button. However, the MCE325 may also be programmed so that each
channel selector button controls both talk and listen for a single channel, permitting operation of
up to four intercom channels. Additionally, users may wish to customize the identification of
channels. With this in mind, a button kit has been supplied with the MCE325 to allow you to
button caps as well as some typical button configurations.
NOTE The standard buttons are opaque. As a result, the front panel LED’s may not be visible when
viewing the MCE325 from a low angle (such as when it is mounted high in an equipment rack).
As a remedy for this problem, clear buttons are available that allow the LED light to pass through.
(Order RTS™ part no. 9000-2698-800)
Volume Controls
CH1 (VOL 1): This control adjusts the volume of channels 1 and/or 3 to the left headphone when
stereo headphones are used. It adjusts the mono mix level of these channels when monaural
headphones or an external speaker is used.
CH2 (VOL 2): This control adjusts the volume of channels 2 and/or 4 to the right headphone
when stereo headphones are used. It adjusts the mono mix level of these channels when monaural
headphones or an external speaker is used.
PGM VOL: This control adjusts the mono mix of program A and program B (input at the rear
panel and assigned via internal programming) to the headphones and external speaker.
Sidetone Nulling Trimmers
These trimmers are adjusted to prevent acoustic feedback when using a panel microphone along
with an external speaker.
Connections, Inputs and Outputs
Front Panel
DYNamic MIC HEADSET: This connector accepts a stereo-earphone, dynamic-microphone
headset (with or without a mic on/off switch).
CARBon MIC HEADSET: This connector accepts a standard 3-conductor, ¼-inch phone plug.
The necessary phantom power is provided to power a carbon microphone or its electronic
equivalent.
Panel Microphone Jack
The MCE325 may be optionally fitted with a gooseneck panel microphone by removing the
blanking plug located in the upper-right corner of the front panel. The panel microphone jack
accepts specially made gooseneck microphones (MCP-90 series), which are available from RTS.
1-2 M C E 3 2 5 U s e r I n s t r u c t i o n s
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Figure 1.1 MCE325 front and rear panel features.
Rear Panel Features
Intercom Lines
Connectors J8 and J9 are parallel-wired for loop-through connection to additional stations. These
connectors are used either for two-wire channels 1 and 2 input/output, or four-wire channel A
output. (The four-wire channel A input is connected at the auxiliary connector.)
Connector J10 is used for two-wire channel 3 and 4 input/output, or four-wire channel B output,
but no loop-through connector is provided for these channels. (The four-wire channel B input is
connected at the auxiliary connector.)
The MCE325 presents a bridging impedance of 10,000 ohms to the intercom line, and is designed
for use with intercom lines having a 200-ohm line terminating impedance. A 200 ohm termination
plug is supplied (connected to J10) to prevent channels three and four from oscillating when the
MCE325 is in two-channel mode.
External Program Input
Two ¼-inch phone jacks are provided for external program input. The station accepts line-level,
balanced input. The two program inputs are mixed internally, and may be assigned (through
internal programming) to right headphone, left headphone, external speaker, or any combination
of these. In addition, program A may be assigned (through internal programming) to two-wire
channel 3 or four-wire channel A; program B may be assigned to two-wire channel 4, but cannot
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be assigned to a four-wire channel. The program assigned to channels is interrupted during talk
output.
Speaker Output
A ¼-inch phone jack is provided for connection of an external speaker (8-ohms minimum
impedance). The speaker output is compatible with the MCS325 speaker.
Auxiliary Connector
Standard Options on the 25-pin, female, D-Sub connector are:
1 Unswitched microphone output
2 ISO connection to a VCP6A/VCP12A/VCP12B
3 Microphone on/off switch
4 Remote headset
5 Remote panel microphone
6 Separate inputs for +10 to +15 volts DC, and +17 to +24 volts DC
7 Common/ground circuit
8 Four-wire channel A and B inputs
9 Remote speaker mute
10Key outputs
Programming
Three methods of programming are used:
1 Front panel programming via the channel selector and operation buttons.
2 Internal programming via circuit board DIP switches.
3 Internal programming via circuit board jumpers.
The most commonly programmed options are assigned to the front panel for convenience.
Detailed information on internal programming is provided in Section 2, Installation. Detailed
information on front panel programming is provided in Section 3, Operation.
Power
The MCE325 is designed for local powering, and is supplied ready for use with either 115 or 230
VAC (but not both). The unit may also be powered from an external DC source connected at the
Auxiliary (J22) connector on the rear panel. For information on changing the AC supply voltage
configuration, or using DC power, see Section 2.
Mounting Configuration
Mounting configurations are illustrated in Figure 2.3 and include rack mount speaker station,
console mount headset station, rack mount headset station, desk top headset station, and portable
speaker station. Some mounting configurations may require a remotely located microphone or
headset. These may be connected to the Auxiliary connector (J22) on the back of the unit.
1-4 M C E 3 2 5 U s e r I n s t r u c t i o n s
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MCE325 Specifications
General
Bridging Impedance (to line)
Noise Contribution to 200-ohm Line
Call Signal Frequency
10,000 ohms typical
-90 dBu
20 kHz, crystal controlled
24 kHz, crystal controlled
Talk-off Frequency
Microphone Preamplifier
Maximum Voltage Gain
Frequency Response
Input Impedance
54 dB
100 Hz to 8,000 Hz, 3 dB
1,000 ohms
Limiter Range
30 dB
Headphone Amplifier
Maximum Voltage Gain
Frequency Response
Headphone Impedance
Output Power
30 dB
100 Hz to 8,000 Hz, 3 dB
50 to 600 ohms
150 mW into 50 ohms
8 Vp-p
Output Voltage Level
Speaker Amplifier
Maximum Voltage Gain
Frequency Response
30 dB
100 Hz to 8,000 Hz, 3 dB
8 to 16 ohms
5W into 8 ohms
16 Vp-p
Speaker Impedance
Output Power per Amplifier
Output Voltage Level
Power and Mechanical
Power Requirements
115 to 230 VAC, 20 VA max,
12 to 25 VDC, 100 to 125 mA quiescent, 900 mA max
Dimensions
Weight
1.72” H x 8.2” W x 8” D (44 mm x 208 mm x 203 mm)
4.25 lbs (1.93kg)
Material/Finish
finish
Thermo-plastic front panel, aluminum case, light gray
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Connectors
Intercom Line Connector
XLR type, 3-pin (male-female loop through on two-wire
channel 1 and 2, or four-wire channel A; Female only on
two-wire channel 3 and 4, or four-wire channel B
Dynamic Mic
Carbon Mic
XLR type, 6-pin female
¼-inch phone jack, 3-circuit
25-pin, female, D-Sub
Auxiliary Connector
Program Inputs
Speaker Output
Panel Mic
¼-inch phone jack, 3-circuit
¼-inch phone jack, 3-circuit
¼-inch phone jack, metal busing, 3-circuit
MCS325 Specifications
The MCS325 is designed for use with MCE325, but may also be used as a general-purpose
monitor for program material.
Impedance
Power Rating
Sensitivity
8 ohms (DCR5.5 to 7 ohms)
5W RMS continuous
90 dB 2 dB/2.83 volts/one meter on axis averaged over
one octave bands centered at 250 Hz, 500 Hz, 1 kHz,
2 kHz, 4 kHz, and 8 kHz when enclosed in a sealed box
of 1.3 liters volume.
Frequency Response
200 Hz to 10 kHz 4 dB on 1/10 octave measurement in
1.3 liter sealed box.
Free Air Resonance
Distortion
200 Hz to 250 Hz
Less than 10% @ 5W at resonance.
Less than 1 gauss at 1 cm from chassis.
Stray Magnetic Field
Mechanical Noise
Unit to be free of buzzes and rattles at 5 W sine wave
input from 100 Hz to 10 kHz.
Figure 1.2 Standard two-channel, two-wire configuration.
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Figure 1.3 Standard four-channel, two-wire configuration.
Figure 1.4 A four-channel, two-wire configuration with two channels used for IFB’s.
Figure 1.5 Configuration for one or two two-wire channels and one four-wire channel.
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Figure 1.6 Standard two-channel, four wire configuration.
Figure 1.7 Multiple interconnected stations in four-channel, two-wire configuration with two channels
used for IFB’s.
1-8 M C E 3 2 5 U s e r I n s t r u c t i o n s
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Figure 1.8 Multiple interconnected stations using one four-wire intercom channel and two two-wire
channels for IFB’s.
Figure 1.9 A four-channel, two-wire configuration with two channels used for IFB’s (shown with TELCO
interface).
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1-12 M C E 3 2 5 U s e r I n s t r u c t i o n s
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S E C T I O N
C
HAPTER2
INSTALLATION
Internal Programming and Adjustments
WARNING
Hazardous voltages exist inside this equipment. Disconnect the AC line cord before
opening the equipment or attempting any internal programming or adjusting.
General
Prior to installing the MCE325, it may be necessary to change some of the internal programming
to suit your particular application. Table 2.1 and Table 2.2 list the functions for the DIP switches
and jumpers which are used for internal programming. Also shown are the default settings that
were pre-programmed at the factory.
If your application requires settings that are different from the defaults, you will have to remove
internal programming, it may be useful to note the changes for future reference.
programming is accomplished by setting switches to the “off” or “on” positions. Jumper
programming is accomplished using shorting jumpers. By inserting the jumpers to short the
appropriate pins, a function is either assigned or not assigned. Pin 1 of each jumper is indicated by
trimmers for adjusting the sidetone and speaker dimming levels. Usage of the DIP switches,
jumpers, and level trimmers is described in the following paragraphs.
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Figure 2.1 Top cover removal.
Intercom Line-Channel Configurations (DS1-DS3, J6, J7, J19 & J20)
The four channels of the MCE325 may be assigned to intercom lines in a variety of ways.
Channel assignment is determined by the settings of DIP switches DS1 through DS3 and jumpers
J6, J7, J19, and J20. There are six possible intercom line configurations. These are listed in Table
2.3 together with the proper DIP switch and jumper settings for each.
Table 2.1 DIP switch functions and default settings.
Switch Number Switch Function
Default Setting
DS1
four-wire CH A output not installed (off), four-wire CH A output installed Off
(on)
DS2
four-wire CH B output not installed (off), four-wire CH B output installed Off
(on)
DS3
DS4
two-channel mode (off)*, four-channel mode (on)
Off
Off
Front panel setup lock-out disabled (off), Front panel setup lock-out
enabled (on)
DS5
DS6
DS7
DS8
Listen and talk muted during ISO (off), Talk only muted during ISO (on) Off
Not used
Off
On
Off
Talk-off transmit disabled (off), Talk-off transmit enabled (on)
VOX disabled (off), VOX enabled (on)
NOTE The terms “two-channel mode” and “four-channel mode” apply only to two-wire lines. In two-
channel mode, each two-wire line uses two channel selector buttons: one for talk and one for
listen. In four-channel mode, each two-wire line uses one channel selector button for both talk and
listen.
The two-channel mode should be selected under only two circumstances:
1 When only one or two two-wire lines are connected to channels one and two only.
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2 When a two-wire line is connected to channel one and a four-wire line is connected to channel
B.
For all other intercom line configurations that use two-wire lines, DS3 must be set to the “on”
position for four-channel operation.
Table 2.2 Jumper functions and default settings.
Jumper Number Jumper Function
Default Setting
J4
J5
J6
Assigns PROGRAM A input to two-wire CH 3 or four-wire CH B. Not assigned
Not assigned: pins 2 & 3 shorted.
Assigned: pins 1 & 2 shorted (IFB to CH 3).
Assigns PROGRAM B input to two-wire CH 4.
Not assigned: pins 2 & 3 shorted.
Not assigned
Assigned: pins 1 & 2 shorted (IFB to CH 4).
Selects two-wire CH1 and CH 2, or four-wire CH A output. (See J19 Two-wire operation
for CH A input.)
CH1 and CH 2 selected: pins 2 & 3 shorted.
Four-wire CH A output selected: pins 1 & 2 shorted.
J7
Selects two-wire CH 3 and CH 4, or four-wire CH B output. (See J20 Two-wire operation
for Ch B input.)
CH 3 and CH 4 selected: pins 2 & 3 shorted.
Four-wire CH B output selected: pins 1 & 2 shorted.
J16
J17
Assigns mono mix of the PROGRAM A and B inputs to the left
headphone.
Not assigned: pins 2 & 3 shorted.
Assigned: pins 1 & 2 shorted.
Assigned
Assigned
Assigns mono mix of the PROGRAM A and B inputs to the right
headphone.
Not assigned: pins 2 & 3 shorted.
Assigned: pins 1 & 2 shorted.
J18
J19
J20
J24
Assigns mono mix of the PROGRAM A and B inputs to the speaker. Assigned
Not assigned: pins 2 & 3 shorted.
Assigned: pins 1 & 2 shorted.
Selects four-wire CH A input. Off (not used): pins 2 & 3 shorted.* Off
On when LISTEN 1 button is on: pins 1 & 2 shorted.
Always on: pins 3 & 4 shorted.
Selects four-wire CH B input. Off (not used): pins 2 & 3 shorted.*
On when LISTEN 2 button is on: pins 1 & 2 shorted.
Always on: pins 3 & 4 shorted.
Off
Selects unbalanced or balanced dynamic mic input.
Unbalanced: pins 2 & 3 shorted.
Unbalanced mic input
Balanced: pins 1 & 2 shorted.
NOTE *J19 and J20 jumpers should be in “off” positions when two-wire lines are used.
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Table 2.3 Internal programming for the various intercom line configurations.
DIP SWITCHES JUMPERS
DS1 DS2 DS3 J6
Configuration 1: Two 2-wire lines (CH 1& CH 2). (Default configuration.)
Off Off Off Pins 2 & 3 shorted Pins 2 & 3 shorted Pins 2 & 3 shorted Pins 2 & 3 shorted
Configuration 2: Three or four 2-wire lines (CH 1, CH 2, CH 3, CH 4).
Off Off On Pins 2 & 3 shorted Pins 2 & 3 shorted Pins 2 & 3 shorted Pins 2 & 3 shorted
Configuration 3: One 2-wire line (CH 1); One 4-wire line (CH B).
Off On Off Pins 2 & 3 shorted Pins 1 & 2 shorted Pins 2 & 3 shorted Pins 1 & 2 shorted
Configuration 4: Two 2-wire lines (CH1 & CH2); One 4-wire line (CH B).
Off On On Pins 2 & 3 shorted Pins 1 & 2 shorted Pins 2 & 3 shorted Pins 1 & 2 shorted
Configuration 5: Two 2-wire lines (CH 3 & CH4); One 4-wire line (CH A).
On Off On Pins 1 & 2 shorted Pins 2 & 3 shorted Pins 1 & 2 shorted Pins 2 & 3 shorted
Configuration 6: Two 4-wire lines (CH A & CH B).
On On On Pins 1 & 2 shorted Pins 1 & 2 shorted Pins 1 & 2 shorted Pins 1 & 2 shorted
J7
J19
J20
NOTE See Table 3.1for a summary of how the channel selector buttons work for the various
configurations. The MCE325 is typically supplied with a termination plug inserted into J10. This
plug terminates CH 3 and CH 4 with 200 ohms to prevent oscillation when these channels are not
used. When the channels are used, this termination plug should be removed.
Front Panel Setup Mode Lock-out (DS4)
DIP switch DS4 may be set to lock out the front panel programming and prevent changes. Front
panel programming is described in Section 3, Operation.
ISO (DS5)
The MCE325 may be used with an RTS Model VCP6A, VCP12A, or VCP12B Control Station to
permit private conversation between the MCE325 operator and a camera operator. When ISO
mode is engaged, either talk, or talk and listen (depending on the setting of DS5) for all other
channels connected to the MCE325 will be muted, and a private line will be established between
the MCE325 operator and the camera operator. See “ISO Connection” for wiring information.
Remote Talk-off (DS7)
The MCE325 is capable of generating and transmitting an inaudible, 24 kHz signal on an
intercom channel. This signal is used to turn off the microphones on any remote stations on the
channel (stations with remote talk-off feature only). This feature is useful when an unattended
user station with an activated microphone is introducing unnecessary noise into a line. DIP switch
DS7 enables/disables this feature. When remote talk off is enabled, the talk-off signal is activated
using the CALL button on the front panel. (for Operation see “Using the Talk-Off Feature”.)
VOX (DS8)
DIP switch DS8 turns the voice activated microphone circuit on or off. Voice activation can be
used with the panel microphone, a headset, or a remote microphone connected at the rear panel.
(There is no adjustment for VOX sensitivity.)
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Program Assignment – IFB Option (J4, J5, J16-J18)
Jumper J4 assigns PROGRAM A to two-wire CH 3 or four-wire CH B with interrupt during talk
(IFB A). Jumper J5 assigns PROGRAM B to CH 4 with interrupt during talk (IFB B).
(PROGRAM B is not used in four-wire mode.)
Jumpers J16, J17, and J18 assign the mono mix of both program inputs to the left headphone,
right headphone, and speaker respectively. Program volume to the headphones and speaker is
controlled by the PGM VOL control on the front panel.
Balanced/Unbalanced Dynamic Microphone Selection (J24)
The MCE 325 may be used with headsets having either a balanced or unbalanced dynamic
microphone. The MCE325 is pre-programmed for use with an unbalanced microphone by
shorting J24 pins 2 and 3. For balanced microphones, remove the shorting jumper and reinstall it
to short pins 1 and 2.
Headphone Sidetone Trimmer Adjustment (R37)
The headphone sidetone trimmer (R37) adjusts the loudness of your own voice heard in your
headset when the microphone is on and the speaker is off. (It does not affect the actual level heard
on the intercom lines.) This trimmer is preset so that your voice level in the headphones will be
approximately ¾ of the intercom line level. To prevent feedback, this signal is automatically
turned off when the external speaker is turned on with the SPKR ON switch.
Speaker Dim Adjustment (R157)
When an external speaker is used, switching the microphone on will cause the speaker level to
attenuate. The level of attenuation may be adjusted with the speaker dim trimmer (R157). The
minimum attenuation of 6 dB is preset at the factory (R157 fully clockwise). The range of
adjustment is –6 dB to –40 dB.
Mechanical Installation
Dimensional requirements for the various mounting configurations are illustrated in Section 6.
Also allow an additional 4.0 inches (102 mm) of rear panel clearance for connectors.
If the headset connector is remotely located (See “External Headset”), allow space between the
cable and interfering sources such as TV monitors, power supplies and equipment with internal
power supplies. The MCE325 has no special ventilation space requirements.
Assembly of optional mounting components is shown in Figure 2.3.
2-6 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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Electrical Installation
AC Power and Fuse
The Model MCE325 is pre-wired for either 115 or 230 VAC operation, and the appropriate fuse is
already installed. The MCE325 uses a 0.5A Slo-Blo fuse for 115 volt operation, or a 0.25A Slo-
Blo fuse for 230 volt operation. (A fused external DC source may be used instead of AC power if
desired. (See “External DC Power Source”.)
Intercom Lines J8, J9, and J10
General
Intercom line connectors J8 and J9 are parallel-wired for loop-through connection to other
intercom stations. These connectors are used for connection of two-wire lines to channels one and
two (full-duplex operation), or for connection of four-wire channel A output (channel A input is
connected at the auxiliary connector).
Intercom line connector J10 is used for connection of two-wire lines to channels three and four
(full-duplex operation), or for connection of four-wire channel B output (channel B input is
connected at the auxiliary connector).
Connector Pin-outs
Table 2.4 Connectors J8 and J9.
PIN # FUNCTION
1
2
3
Common (low side of line)
Two-wire CH 1 or four-wire CH A high output
Two-wire CH 2 or four-wire CH A low output
Table 2.5 Connection J10
PIN # FUNCTION
1
2
3
Common (low side of line)
Two-wire CH 3 or four-wire CH B high output
Two-wire CH 4 or four-wire CH B low output
Four-wire Output Termination
Figure 2.4 4-wire output terminations.
When four-wire outputs are used, termination resistors must be installed for proper operation. The
output amplifiers are current sources, and the output level is determined by the terminating
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resistor values. These resistors would normally be installed in the cable connector, but may be
placed at any point in the signal path. Recommended values are shown in X.
Program Inputs, J14 and J15
The PROGRAM A and B inputs accept line-level (0 dBu nominal), balanced audio. The program
inputs are connected using ¼-inch stereo phone plugs.
Figure 2.5 Connectors J14 and J15.
SECTION
FUNCTION
Tip
Program high
Program low
Common
Ring
Sleeve
The MCE325 must be internally programmed to assign the program inputs to the intercom lines,
headphones, or speaker output (see “Program Assignment”). Program volume to the headphones
and speaker is controlled by the PGM VOL control on the front panel.
External Speaker, J27
The SPEAKER OUTPUT jack provides a bridging-type output for an external speaker (8 ohms
minimum). The external speaker is connected using a ¼-inch phone plug.
Figure 2.6 Connector J27.
SECTION
FUNCTION
Tip
Speaker plus
Speaker minus
No connection
Ring
Sleeve
CAUTION The MCE325 provides a bridging-type speaker output. DO NOT LET EITHER SPEAKER
LEAD CONTACT GROUND.
The external speaker is turned on and off by the front panel SPKR ON switch.
Auxiliary Connector, J22
Four-Wire Channel A and B Input
The four-wire channel A and channel B inputs are connected at the auxiliary connector as
follows:
Table 2.6 Auxiliary connector, J22.
PIN # FUNCTION
8
Four-wire channel A high
Four-wire channel A low
Four-wire channel B high
Four-wire channel B low
21
9
22
The four-wire inputs must be assigned, using internal programming jumpers J19 and J20, before
they can be used (as previously described in “Intercom Line-Channel Configurations (DS1-DS3,
J6, J7, J19 & J20).”
2-9
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Key outputs – Expanded IFB Option
Four logic-type outputs are available at pins 6, 7, 19, and 20 of the auxiliary connector:
Table 2.7 Auxiliary connector, J22.
PIN # FUNCTION
6
CH 1 or four wire CH A key output
CH 3 or four-wire CH B key output
CH 2 key output
7
19
20
CH 4 key output
There are internal pull-up resistors on the CH 3 and CH 4 key outputs. Pressing the CH 3 or CH 4
talk button will result in a logic high to low transition at the corresponding key output. (Logic
high is approximately 13 VDC; Logic low is less than 2 VDC.) There are no internal pull-up
resistors on the CH 1 and CH 2 key outputs. These outputs will “float” until externally loaded.
The channel three and four key outputs may also be used to expand the IFB function, allowing
any one of several MCE325 User Stations to interrupt a single-point program source and talk on
the interrupted channel. For example, if one MCE325 is operating with PROGRAM A assigned to
channel three, the channel three key output of a second MCE325 User Station (with no program
connected) can be directly connected to the channel three key output of the first MCE325;
activating channel three for talk from either station will now interrupt the program source and
permit that station to talk on channel three.
Remote Microphone Switch
A remote microphone switch may be connected at the auxiliary connector. Connect mic switch
high to pin 25; connect mic switch low to pin 10 or 11. When the switch is closed, the microphone
will turn on, and the front panel MIC ON LED will illuminate. When the remote switch is off, the
microphone may be turned on from the front panel. When the remote switch is on however, the
microphone cannot be turned off from the front panel.
ISO Connection
To connect an RTS Model VCP6A, VCP12A, or VCP12B ISO Control Panel to the MCE325,
connect the unswitched microphone output of the MCE325 (pins 1 and 14 of the auxiliary
connector) to the four-wire input of the VCP Control Panel; connect the four-wire output of the
VCP Control Panel to either a four-wire input or a program input of the MCE325; connect the
logic contact output of the VCP Control Station to the ISO input of the MCE325 (pin 12 of the
auxiliary connector); connect VCP common to pin 11 of the auxiliary connector.
External Headset
An external headset may be connected to the auxiliary connector. (See “Headset Requirements”.)
Connect headphone left to pin 5, headphone right to pin 18, and headphone common to pin 17.
Connect microphone high to pin 4; connect microphone low to pin 16. The external headset
connections are wired in parallel with the front panel dynamic headset connector; therefore, use
only one at a time.
In the headset connecting cable, prevent coupling between the microphone and headphone leads
by using a shielded twisted pair for the microphone, and a separate shielded twisted pair for the
headphones. Do not allow headphone common to contact microphone low. Tie the headphone
shield to headphone common. The headset cable can be made longer when the microphone and
headphone pairs are physically separated. The wider the separation, the longer the allowable cable
length. Estimated maximum usable headphone cable lengths are as follows:
Single cable, two shielded twisted pairs: 10 feet (3.05 m). Dual-ribbed cable, two shielded twisted
pairs: 30 feet (9.14 m).
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Separate shielded twisted pair cables: 50 feet (15.24 m). Balanced microphone input: up to 100
feet (30.48 m).
External Electret Microphone
An external electret microphone may be connected at the auxiliary connector and used in place of
a front-panel gooseneck microphone. Connect microphone high/bias to pin 15 and connect
microphone low to pin 2. When using an external microphone, do not connect a front-panel
gooseneck microphone.
Unswitched Microphone Output
The microphone audio is provided as an unswitched, balanced output at the auxiliary connector.
The in-phase signal is available at pin 1; the inverted-phase is available at pin 14.
External DC Power Source
The MCE325 may be powered from an external DC power supply in the 10 to 25 volt range (500
mA minimum).
If the external supply is in the 10 to 15 volt range, connect the positive lead to pin 13 of the
auxiliary connector and connect the minus lead to pin 10 or 11. A 0.5 Amp slo-blo fuse should be
connected in-line for 17 to 24 volt operation.
Remote Speaker Mute Control
When the MCE325 is used with an external speaker, the speaker may be muted from a remote
location. Applying a logic low signal to pin 25 of the auxiliary connector will cause muting.
Connect circuit common to pin 11.
Front Panel Headset Connections
Headset Requirements
Use headphones with an impedance of 25 ohms or greater. Low impedance 8 ohm headphones are
not recommended. Headphones with good acoustic isolation (20 to 40 dB) improve
communication in high ambient noise environments, and allow the user to use the headphones at a
less tiring, lower volume.
Headset Connections
Dynamic-microphone headset connector: XLR-6 type receptacle.
Table 2.8 Dynamic-microphone headset connector.
PIN # FUNCTION
1
2
3
4
5
6
Balanced mic low/unbalanced mic common
Balanced/unbalanced mic high
Headphone/mic switch common
Headphone left
Headphone right
Mic Switch high
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Carbon-microphone headset connector: ¼-inch, tip-ring-sleeve phone jack.
Table 2.9 Carbon-microphone headset connector.
SECTION FUNCTION
Tip
Carbon microphone
Headphone
Ring
Sleeve
Common/ground
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S E C T I O N
C
HAPTER3
OPERATION
General
The front panel buttons have different functions when the MCE325 is switched from operating
mode to setup mode. Legends on the buttons indicate their operating mode functions; legends
under the buttons indicate their setup mode functions. All of the front panel buttons were pre-
programmed for a certain type of operation. This is the default configuration. Operation for the
default configuration is described first, and is then followed by front panel programming
instructions to alter the operation.
Operating Instructions
Momentary/Latching Button action
The channel selector buttons and the MIC ON button feature a special momentary/latching dual-
action: if a button is pressed and released quickly it will “latch” (turning “on” if off or turning
“off” if on); if the button is pressed and held slightly longer, the action will be momentary and the
button will turn off when released. All other buttons are latching-only (press to activate, press to
release).
NOTE The latching action can be disabled through the front panel programming.
LED Indicators
LED indicators are provided for each button to indicate current status. The LED can provide up to
four indications: continuously off, continuously on, short blink (50% on, 50% off) and long blink
(90% on, 10% off).
Channel Selection
Table 3.1 summarizes the operation of the channel selector buttons for the various intercom line
configurations. Basically, four-wire intercom lines always use one TALK and one LISTEN
button for intercom communication, as do two-wire lines when the station has been programmed
for two-channel operation.
When the station is operated in four-channel mode, however, each two-wire intercom line uses
only one channel selector button to control both talk and listen, and the MCE325 is pre-
programmed so that a channel is activated for both talk and listen when the button is pressed. The
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button action can be changed, via the front panel programming, so that the button controls talk
only, with listen either always on or always off.
Panel Mic/Headset Mic Selection
The PANEL MIC button selects either panel microphone (LED on) or headset microphone (LED
off).
Microphone On/Off
The MIC ON button turns the microphone on (LED on) or off (LED off).
NOTE The MCE325 can be programmed, via the front panel, so that the microphone will automatically
turn on whenever a channel is activated for talk. The MCE325 may also be internally
programmed for voice-activated microphone (VOX) as previously described in Section 2.
Speaker On/Off
The SPKR ON button turns the external speaker on (LED on) or off (LED off).
Volume Adjustment
Table 3.1 summarizes the operation of the volume controls for the various intercom line
configurations. The MCE325 is pre-programmed for stereo operation; CH 1 (VOL 1) adjusts the
level to the left headphone and CH 2 (VOL 2) adjusts the level to the right.
NOTE The MCE325 can be programmed, via the front panel, for monaural operation if desired.
The PGM VOL control adjusts the monaural mix of both program inputs to both headphones and
to the external speaker. It does not affect the program volume on the intercom lines.
Front Panel Sidetone Nulling Trimmer Adjustment
When the MCE325 is used with two-wire lines, the station operator’s voice signal is not only
transmitted onto the intercom lines, but also echoed back into the MCE325 receive circuits. This
can result in acoustic feedback when the MCE325 is used with an external speaker. The sidetone
nulling trimmers are used to null, or subtract, the station operator’s voice signal from the rest of
the received signal to prevent this feedback. (NOTE: This is not necessary in four-wire systems
since transmit and receive use separate circuits.) A trimmer is provided for each of the four
channels. The trimmers are factory-preset for maximum nulling of the microphone signal when
an ideal 200-ohm resistance terminates each intercom channel; however, the trimmers may
require slight readjustment after the MCE325 has been installed to compensate for variations
from the ideal.
To adjust the sidetone nulling trimmers:
1 Turn the speaker switch on (even if an external speaker is not connected). This will turn off the
internal, true sidetone trimmer (see note below).
2 Turn on the microphone.
3 Activate one talk button at a time, and speak into the microphone. Slowly increase the volume,
and note the level of your voice in the headphones or speaker. Adjust the corresponding
sidetone nulling trimmer to minimize your voice signal. Repeat for each channel being used,
making sure that only one channel is activated at a time.
NOTE There is also an internal, true sidetone trimmer, which allows the station operator to hear his or
her voice when using headphones. This sidetone signal is turned off when the speaker switch is
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turned on to prevent feedback. See “Headphone Sidetone Trimmer Adjustment (R37)” for further
details.
Sending and Receiving Call Signals
To call a channel:
1 Press the CALL button; the CALL LED’s will flash to indicate “call signal ready”.
2 Press and hold the talk button for the channel to be called; the call signal will be transmitted as
long as the talk button is held.
3 When a response is received, release the talk button to turn off the call signal.
Receiving a call:
When there is an incoming call, the indicator LED above the appropriate channel selector button
will flash.
Using the Talk-Off Feature
The talk-off feature deactivates the mic switches of all remote user stations on a selected channel.
To use talk-off:
1 Press and release the CALL button three times in rapid succession; the CALL LED’s will turn
on to indicate “talk-off signal ready”.
2 Momentarily press the talk button for the channel to be deactivated. This will cause the talk-off
signal to be transmitted.
3 Release the talk button to end the talk-off signal transmission.
Front Panel Programming
Activating Setup Mode
Press and hold the CALL button for 5 seconds: the TALK 1, LISTEN 1, TALK 2, LISTEN 2,
PANEL MIC, SPKR ON, and MIC ON LED’s will begin to flash. This is the main menu.
Menu Selection/Ending Setup
The submenu names are listed under the switches. Press the desired switch to access the submenu
for that switch. Press the CALL button from a submenu to return to the main menu; press the
CALL button again to exit from the main menu to the operating mode.
NOTE If no submenu is selected from the main menu within 12 seconds after program mode activation,
the programming mode will time out, and the MCE325 will return to normal operation. If a
submenu is selected, however, the unit will remain in programming mode until intentionally
exited.
Submenus
The following paragraphs describe each of the submenus. The default, or factory pre-programmed
setting, is also indicated for each submenu.
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Channel ID
The MCE325 can be programmed so that when someone is talking on an intercom channel, the
corresponding listen button LED will flicker as they talk to provide a visual indication of which
channel is talking. With the Channel ID submenu selected, press each TALK button to select or
deselect Channel ID. The button’s LED will indicate the Selected mode as follows:
Short LED blink: Channel ID disabled. (default).
Long LED blink: Channel ID enabled.
Four-channel Listen
When the MCE325 is operating in four-channel mode, each channel selector button may be
individually programmed for one of three types of operation. With the Four-channel Listen
submenu activated, press each channel selector button one or more times to select the desired type
of operation as follows:
Short LED blink (90% on, 10% off): Button must be pressed to talk or listen (default).
Long LED blink (50% on, 50 % off): Listen will always be on; button must be pressed to talk.
LED off: listen will always be off; button must be pressed to talk.
Mono
The headphone output may be configured for either monaural or stereo operation. With the Mono
submenu selected, press the Mono button one or more times to select the type of headphone
output as follows:
Long LED blink: (50% on, 50 % off): Stereo (default).
Short LED blink: (90% on, 10 % off): Monaural.
Call Disable
Call disable prohibits incoming or outgoing call indication and signaling on selected channels.
With the Call Disable submenu selected, press each talk button to select the desired operation as
follows:
Short LED blink (90% on, 10 % off): Call function enabled (default).
Long LED blink (50% on, 50% off): Call function disabled.
Button Lock
Button lock permits all buttons (except CALL) to be individually programmed for one of three
types of operation. With the Button Lock submenu selected, press each button one or more times
to select the desired type of operation as follows:
Short LED blink (90% on, 10% off): No button lock (default).
Long LED blink (50% on, 50% off): Button locked in the “on” position.
LED off: Button locked in the “off” position.
Latch Disable
Latch disable may be used to prohibit latching action for individual channel selector buttons and
the MIC ON button. With the Latch Disable submenu selected, press each channel selector button
or the MIC ON button one or more times to select the desired type of operation as follows:
Short LED blink (90% on, 10% off): Latching enabled (default).
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Long LED blink (50% on, 50% off): Latching disabled.
Instant Mic
Talk buttons may be individually programmed to automatically activate the microphone when
pressed. With the Instant Mic submenu selected, press each talk button one or more times to select
the desired type of operation as follows:
Short LED blink (90% on, 10% off): Instant mic off (default).
Long LED blink (50% on, 50% off): Instant mic on.
Reset
To restore the original programming, hold down the CH 1 talk button for about two seconds while
powering up the MCE325.
Table 3.1 Front panel control usage for the various intercom line configurations.
VOLUME CONTROL USAGE CHANNEL SELECTOR BUTTON USAGE
CH 1 (VOL 1) CH 2 (VOL 2) 1 TALK
Configuration 1: Two -2wire lines (CH 1 & CH 2). (Default configuration.)
CH 1 CH 2 CH 1 TALK CH1 LISTEN
Configuration 2: Three or four 2-wire lines (CH 1, CH 2, CH 3, CH 4).
1 LISTEN
2 TALK
2 LISTEN
CH 2 TALK
CH 2 LISTEN
CH 1 & CH 3
CH 2 & CH4
CH 1 TALK &
LISTEN
CH 2 TALK &
LISTEN
CH 3 TALK &
LISTEN
CH 4 TALK &
LISTEN
Configuration 3: One 2-wire line (CH 1); One 4-wire line (CH B).
CH 1 CH B CH 1 TALK CH 1 LISTEN
Configuration 4: Two 2-wire lines (CH 1 & CH 2); One 4-wire line (CH B).
CH B TALK
CH B TALK
CH B LISTEN
CH B LISTEN
CH 1
CH 2 & CH B
CH 1 TALK &
LISTEN
CH 2 TALK &
LISTEN
Configuration 5: Two 2-wire lines (CH 3 & CH 4); One 4-wire line (CH A).
CH A & CH 3
CH 4
CH A TALK
CH A LISTEN
CH 3 TALK &
LISTEN
CH 4 TALK &
LISTEN
Configuration 6: Two 4-wire lines (CH A & CH B).
CH A CH B CH A TALK
CH A LISTEN
CH B TALK
CH B LISTEN
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S E C T I O N
C
HAPTER4
MAINTENANCE
Preventive Maintenance
Clean the unit and verify its performance periodically.
Factory Support Information
Factory support information is located on the first page of this manual.
Corrective Maintenance
WARNING: Hazardous voltages exist inside the MCE325. Attempting diagnosis, repair,
or adjustment with the AC line connected could result in serious injury or death. These
servicing instructions are for qualified personnel only.
Access
1 Reference the AS6464 drawing in section 6. Remove the four long screws (item 4) and the two
short screws (item 5).
2 Lift off the top cover.
3 Pull the front panel slightly forward to clear the carbon mic jack on the main circuit board. Lift
the front panel slightly while sliding the back panel toward the rear and out of the lower case.
The MCE325 may now be operated for troubleshooting.
NOTE when reassembling the bottom cover, make sure the rubber button on the inside of the bottom
cover (item 7) is toward the front of the unit.
Front Panel Removal
1 Unplug the panel mic (J1) and dynamic-mic headset (J2) connectors from the main circuit
board.
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2 The ribbon connector from the front panel board to the main board is attached at both ends with
locking connectors. To unlock the connector, pull the outer shell away from the circuit board.
Then, pull the ribbon cable out.
Cleaning
Clean the front panel and case with alcohol or a mild solution of detergent and water, and then
wipe off detergent residue with a damp rag. Clean the circuit board (if necessary) with a
tetraflouroethane product such as Flux-Off® CZ by Chemtronics®. Use eye protection and avoid
breathing the vapors with these solvents. Also, avoid getting the solvent in any of the
potentiometers.
Test and Adjustment Procedures
Notes
• All AC voltages are RMS unless otherwise specified.
• All input and output levels were measured using an AC voltmeter calibrated for
1 mW = 0.775V at 600 ohms, but with the 600 ohms in the circuit (0 dBu).
• The following procedures involve changing the MCE325 programming. It may be useful to
note the current positions of all jumpers and DIP switches so that they can be returned to their
proper positions after testing.
• The inside of the top cover contains a location diagram for the programming jumpers and DIP
switches. Place it next to the MCE325 during testing for convenient reference.
• Test procedures are written to be performed in the order presented.
Test Equipment
• Variac
• 15 MHz Oscilloscope
• AC Voltmeter
• Frequency Counter
• DC Voltmeter
• Balanced Audio Generator
• 400 Hz to 30 kHz bandpass filter with +40 dB of gain
Power Supply Test
1 Set a variac to 117 VAC, 60 Hz, and connect the MCE325 to the variac. Observe that each
LED blinks on in sequence, and then all LED’s are off.
2 Measure the voltage across the secondary of T1 (between test points E7 and E8 on the main
circuit board).
V
= 18 1.8 VAC
sec
3 Measure the DC voltage across the “+” and “-“ terminals of bridge rectifier CR1.
= 23 2.3 VDC
V
CR1
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4 Measure the ripple.
= 140 mVp-p
V
ripple
5 Measure the regulated DC voltage at U26 pin 2. (There should be no ripple.)
= 13.85 0.3 VDC
V
U26-2
6 Measure the mid-voltage source at U17 pin 7.
= 6.93 0.3 VDC
V
U17-7
7 Measure the +5 V source at the output of U27 pin 2.
= 5.0 0.3 VDC
V
U27-2
Initial Configuration
1 Set all internal jumpers and DIP switches as follows:
DIP Switches: Set all DIP switches, except DS3, to the default settings listed in Table 2.1. Set
DS3 to on. (This places the MCE325 in four-channel mode. Refer to Figure 1.11 for names of
buttons in standard four-channel mode.)
Jumpers: Set all jumpers, except J24, to the default settings listed in Table 2.2. Set J24 to the
balanced mic position (pins 1 and 2 shorted).
2 Connect a 200-ohm termination resistor across each of the four intercom channels:
CH 1: J8 pins 1 and 2
CH 2: J8 pins 1 and 3
CH 3: J10 pins 1 and 2
CH 4: J10 pins 1 and 3
3 Set all front panel buttons to off.
4 Set all volume controls to minimum.
Keying Output Test
1 Connect two 47 k ohm resistors: one from the key 1 output (J22 pin 6) to the +14 VDC supply;
and one from the key 2 output (J22 pin 19) to the +14 VDC supply.
NOTE
The cathode of D22 serves as a convenient connection point for the +14 VDC supply. (Refer to
the AS6245 drawing in Section 6 for the location of D22.) The key 1 and key 2 outputs require
external pull-up resistors. The key 3 and key 4 outputs have internal pull-up resistors (RP2B
and RP2D respectively) and do not require external pull-ups.
Figure 4.1 Auxiliary connector, J22.
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2 Set the MIC ON button to on. Set all other front panel buttons to off.
3 Check for 13 VDC minimum at the key 1 output.
4 Turn CH 1 TALK on and check for less than 2 VDC at the key 1 output.
5 Repeat steps 3 and 4 for the other channels:
CH2 TALK: key 2 out (J22 pin 19)
CH3 TALK: key 3 out (J22 pin 7)
CH4 TALK: key 4 out (J22 pin 20)
6 Remove the 47 kohm pull-up resistors when finished.
USMB (Un-Switched Microphone Balanced) Frequency Response
and Level Check
1 Set all front panel buttons to off.
2 Connect a signal generator to the DYN MIC HEADSET jack mic input (J2 pins 1 & 2).
3 Connect a 600 ohm resistor across the USMB output (J22, pins 1 and 14).
4 Connect an AC voltmeter across the 600 ohm resistor.
6 Remove the 600 ohm resistor across the USMB output.
Frequency Response and Level Check, Mic to Line
Four-Channel, Two-Wire Mode
1 Activate the MIC ON button. (All other front panel buttons should be off.)
2 Connect an AC voltmeter across the channel 1 output. The signal generator should still be
connected to the dynamic mic input.
3 Activate the CH 1 TALK button.
5 Repeat for channels 2 through 4 by connecting the AC voltmeter across the appropriate output,
activating the appropriate TALK button, and measuring the output level:
Table 4.1 Talk button vs. output.
TALK BUTTON
OUTPUT
CH 2
CH 3
CH 4
J8, pins 1 and 3
J10, pins 1 and 2
J10, pins 1 and 3
Table 4.2 USMB frequency response and level check.
INPUT
FREQUENCY INPUT LEVEL
OUTPUT LEVEL
1 kHz
-55 dBu (1.4 mV)
–45 dBu (4.35 mV)
–25 dBu (43.5 mV)
-1 3 dBu (0.49 – 0.98 VAC)
2.5 2 dBu (0.83 – 1.32 VAC)
2
2 dBu (0.75 – 1.2 VAC)
100 Hz
-55 dBu (1.4 mV)
–45 dBu (4.35 mV)
–25 dBu (43.5 mV)
-0.5 3 dBu (0.51 – 1.03 VAC)
4.2 2 dBu (0.98 – 1.55 VAC)
4.2 2 dBu (0.98 – 1.55 VAC)
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Table 4.2 USMB frequency response and level check.
10 kHz
-55 dBu (1.4 mV)
–45 dBu (4.35 mV)
–25 dBu (43.5 mV)
-5.7 3 dBu (0.28 – 0.57 VAC)
2.2 2 dBu (0.79 – 1.26 VAC)
2.5 2dBu (0.83 – 1.32 VAC)
Table 4.3 Mic to line response; 4-channel, 2-wire mode.
INPUT
INPUT
FREQUENCY LEVEL
OUTPUT LEVEL
1 kHz
-45 dBu
-45 dBu
-45 dBu
-0.8 2 dBu (0.56 – 0.89 VAC)
-0.8 2 dBu (0.56 – 0.89 VAC)
0.8 2 dBu (0.56 – 0.89 VAC)
100 Hz
100 kHz
Two-Channel, Four-Wire Mode
1 Remove the 200 ohm terminations from intercom channels 1 through 4.
2 Program the MCE325 to be in two-channel, four-wire mode. (See Table 2.3, configuration 6
for switch settings. See Figure 1.11 for names of buttons in standard two-channel mode.)
3 Connect 200 ohm termination resistors across the four-wire A and four-wire B channels:
Four-Wire A: J8 pins 2 and 3
Four-Wire B: J10 pins 2 and 3
NOTE
Normally, the four-wire outputs would be terminated with 600 ohms for four-wire operation,
but 200 ohms are used for testing purposes.
4 Set the MIC ON button to on. Set all other front panel buttons to off.
5 Connect an AC voltmeter across the Four-Wire A output.
6 The signal generator should still be connected to the mic input. Set it to 1 kHz, -45 dBu.
7 Activate CH 1 TALK.
8 The output level should read –0.8 dBu 2 dBu (0.56 – 0.89 VAC)
9 Connect the AC voltmeter across the Four-Wire B output.
10Turn off CH 1 TALK and activate CH 2 TALK.
11The output level should read –0.8 dBu 2 dBu (0.56 – 0.89 VAC)
12Remove the 200 ohm termination resistors.
Sidetone Null Test and Adjustment
NOTE This procedure verifies sidetone null operation and optimizes nulling for an ideal 200 ohm line
termination. Since actual intercom line impedance may vary from the ideal, the MCE325 may
have to be readjusted slightly during actual use.
1 Reprogram the MCE325 to be in four-channel, two-wire mode (Table 2.3, configuration 2).
2 Reconnect 200 ohm termination resistors across each of the four intercom channels.
3 Set the MIC ON button to on. Set all other front panel buttons to off.
4 The signal generator should still be connected to the mic input. Set it to 1 kHz, -45 dBu.
5 Activate the CH 1 TALK button.
6 Monitor the AC signal level at U5 pin 7.
7 Adjust R57 (Sidetone 1 on front panel) for maximum null (minimum signal level) at U5 pin 7.
The signal should be 0.025 VAC or less.
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8 Repeat for channels 2 through 4 by activating the TALK buttons, connecting to the test points
and adjusting the potentiometers as indicated in Table 4.4.
True Sidetone Adjust
1 Configure the DYN MIC HEADSET jack for stereo mode (See Section 3, “MONO”)
2 Set all front panel buttons to off.
3 Connect 51 ohm load resistors across the left headphone output (J2 pins 3 and 4) and right
headphone output (J2 pins 3 and 5).
4 Connect an AC voltmeter across the left headphone output.
5 Remove the signal generator from the mic input, and connect it across intercom channel 1.
Adjust the generator output to –1 dBu (0.69 VAC), 1 kHz.
6 Activate the CH 1 TALK button, and adjust the CH 1-3 volume control (R1) until you measure
11.2 dBu (2.82 VAC) across the left headphone output.
7 Disconnect the signal generator from intercom channel 1. Adjust the generator for minimum
output, and reconnect it across the DYN MIC HEADSET jack mic input (J2 pins 1 & 2).
Readjust the generator output level to –45 dBu, 1 kHz.
8 Turn on the MIC ON button.
9 Adjust R37 (sidetone) on the MCE325 main board to obtain 8.7 dBu (2.1 VAC) at the left
headphone output.
Level and Frequency Response Check, Intercom Channel to
Headphone
1 Set all front panel buttons to off.
2 Remove the signal generator from the mic input, and reconnect it across intercom channel 1.
3 Adjust the signal generator output to –1 dBu, 1 kHz.
4 Preset the CH 1-3 volume control to the 2 o’clock position.
5 Activate the CH 1 TALK button. The left headphone output level should be 11.2 2 dBu (2.2
to 3.6 VAC).
6 Adjust the CH 1-3 volume control to measure 11.2 dBu (2.8 VAC) at the left headphone
output. Check for no distortion or clipping in the output.
7 Adjust the signal generator output to –1 dBu, 100 Hz. The left headphone output should read
10.2 dBu 2 dBu (1.9 to 3.2 VAC)
8 Adjust the signal generator output to –1 dBu, 10 kHz. The left headphone output should read
7.8 dBu 2 dBu (1.5 to 2.4 VAC).
9 Repeat the test for channels 2 through 4. For channel 3, continue to use the CH 1-3 volume
control and monitor the left headphone output. For channels 2 and 4, use the CH2-4 volume
control and monitor the right headphone output.
Table 4.4 Channel 1-4 sidetone trimmer adjust.
TALK BUTTON TEST POINT POTENTIOMETER
CH 1
CH 2
CH 3
CH 4
U5 pin 7
U5 pin 1
U7 pin 1
U7 pin 7
R57 (Sidetone 1)
R73 (Sidetone 2)
R88 (Sidetone 3)
R104 (Sidetone 4)
4-6 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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Level and Frequency Response Check, Intercom Channel to Speaker
1 Set all front panel buttons to off. Set all volume controls to minimum.
2 Connect an 8 ohm load across the speaker output (J27, tip and ring)
3 Connect an AC voltmeter and an oscilloscope across the speaker output.
4 Connect the signal generator to intercom channel 1, and adjust the generator output to –1 dBu,
1 kHz.
5 Set the SPKR ON and CH 1 TALK buttons to on.
6 Rotate the CH 1-3 volume control (R1), and check that the speaker output level reaches +18
dBu (17.4 Vp-p) before clipping.
7 Set the CH 1-3 volume control to get +15 dBu (4.4 VAC) at the speaker output. The volume
control should be approximately at the 2 o’clock position.
8 Activate speaker muting by grounding J22 pin 25 to pin 10. The speaker output level should
drop to 5 mV or less, and the SPKR LED should turn off. Remove the ground connection.
9 Activate speaker dim by grounding U15 pin 9.
10Adjust R157 to the maximum clockwise position. The speaker output should be –5.5dB 1 dB
below the level set in step 7.
11Adjust R157 to the maximum counter-clockwise position. The speaker output should be –39.5
dB 2 dB below the reference level set in step 7.
12Reset R157 to the maximum clockwise position, and remove the speaker dim ground (U15 pin
9).
13Set the signal generator to –1 dBu, 100 Hz. The speaker output should be 10.8 dBu 2 dBu.
14Set the signal generator to –1 dBu, 10 kHz. The speaker output should be 17.5 dBu 2 dBu.
Level and Frequency Response, Program to Headphones and
Speaker
Program A to Left Headphone
1 Set all front panel buttons to off. Set all volume controls to minimum.
2 Set program jumpers J16, J17 and J18 to assign PROGRAM A and PROGRAM B inputs to the
headphones and speaker (pins 1 & 2 shorted on all three jumpers).
3 Remove the signal generator from channel 1, and reconnect it to the PROGRAM A input (J14
tip and ring).
4 Set the signal generator to 0 dBu, 1 kHz.
5 Set the PGM VOL control to maximum.
6 Measure the level at the left headphone output. It should be 1.3 dBu 2 dBu.
7 Set the signal generator to 0 dBu, 100 Hz. The left headphone output should be 0.8 dBu 2
dBu.
8 Set the signal generator to 0 dBu, 10 kHz. The left headphone output should be –3.8 dBu 2
dBu.
9 Reset the generator to 0 dBu, 1 kHz.
10Remove jumper J16 (program not assigned to left headphone). Verify that the signal level
drops at least 35 dB from the reference level in step 9.
4-7
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11Restore jumper J16 to short pins 1 & 2.
Program B to Right Headphone
1 Remove the signal from the PROGRAM A input, and connect it to the PROGRAM B input.
2 Measure the level at the right headphone output (J2, 3 & 5). It should be 1.3 dBu 2 dBu.
(Program volume at maximum.)
3 Set the signal generator to 0 dBu, 100 Hz. The right headphone output should be 0.8 dBu 2
dBu.
4 Set the signal generator to 0 dBu, 10 kHz. The right headphone output should be –3.8 dBu 2
dBu.
5 Reset the generator to 0 dBu, 1 kHz.
6 Remove jumper J17 (program not assigned to right headphone). Verify that the signal level
drops at least 35 dB from the reference level in step 2.
7 Restore jumper J17 to short pins 1 & 2.
Program to Speaker
1 Connect the AC voltmeter across the 8 ohm load at the speaker output
2 Set the SPKR ON button to the on position.
3 Measure the level at he speaker output. It should be 6 dBu 2 dBu. (Program volume at
maximum.)
4 Set the signal generator to 0 dBu, 100 Hz. The speaker output should be 1.3 dBu 2 dBu.
5 Set the signal generator to 0 dBu, 10 kHz. The speaker output should be 7.3 dBu 2 dBu.
6 Reset the generator to 0 dBu, 1 kHz.
7 Remove jumper J18 (program not assigned to speaker). Verify that the signal level drops at
least 35 dB from the reference level in step 3.
8 Restore jumper J18 to short pins 1 & 2.
IFB Test
IFB B
1 Set all front panel buttons to off. Set all volume controls to minimum.
2 Move the J5 jumper to short pins 1 and 2 (IFB B assigned to channel 4).
3 Check the output level across intercom channel 4. It should be –9.8 dBu 2 dBu.
4 Turn on the CH 4 TALK and MIC ON buttons. The channel 4 output should drop at least 45
dB from the reference level in step 3.
5 Turn off the CH 4 TALK and MIC ON buttons.
6 Ground the Key 4 input (short J22 pin 20 to pin 10). The channel 4 output should drop at least
45 dB from the reference level in step 3.
7 Remove the Key 4 ground.
8 Move the J5 jumper to short pins 2 and 3.
4-8 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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IFB A
1 Move the J4 jumper to short pins 1 and 2 (IFB A assigned to channel 3).
2 Remove the signal from PROGRAM B input, and connect it to the PROGRAM A input. Set
the signal generator to 0 dBu, 1 kHz.
3 Check the output level across intercom channel 3. It should be –9.8 dBu 2 dBu.
4 Turn on the CH 3 TALK and MIC ON buttons. The channel 3 output should drop at least 45
dB from the reference level in step 3.
5 Turn off the CH 3 TALK and MIC ON buttons.
6 Ground the Key 3 input (short J22 pin 7 to pin 10). The channel 3 output should drop at least
45 dB from the reference level in step 3.
7 Remove the Key 3 ground.
8 Move the J4 jumper to short pins 2 and 3.
Level and Frequency Response Check, Four-Wire Input to
Headphone
Four-Wire A Input to Left Headphone
1 Set all front panel buttons to off. Set all volume controls to minimum.
2 Remove the signal generator from the Program A input, and connect it to the Four-Wire A
input (AUXILIARY connector J22, pins 8 and 21). Set the generator to 0 dBu, 1 kHz.
3 Move jumper J19 to short pins 3 & 4 (Four-Wire A input always on).
4 Set the CH 1-3 volume control to measure 0 dBu at the left headphone output. (The control
should be at about the 2 o’clock position.)
5 Set the signal generator to 0 dBu, 100 Hz. The left headphone output should be –0.9 dBu 2
dBu.
6 Set the signal generator to 0 dBu, 10 kHz. The left headphone output should be –4.7 dBu 2
dBu.
7 Move jumper J19 to short pins 2 & 3 (Four-Wire A input off).
Four-Wire B input to Right Headphone
1 Remove the signal from the Four-Wire A input, and connect it to the Four-Wire B input (J22,
pins 9 & 22).
2 Move jumper J20 to short pins 3 & 4 (Four-Wire B input always on).
3 Set the CH 2-4 volume control to measure 0 dBu at the right headphone output. (The control
should be at about the 2 o’clock position.)
4 Set the signal generator to 0 dBu, 100 Hz. The right headphone output should be –0.9 dBu 2
dBu.
5 Set the signal generator to 0 dBu, 10 kHz. The right headphone output should be –4.7 dBu 2
dBu.
6 Move jumper J20 to short pins 2 &3 (Four-Wire B input off).
4-9
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Panel Mic to Channel Test
1 Turn all front panel buttons off. Set all volume controls to minimum.
2 Remove the signal from the Four-Wire B input and reconnect it to the panel mic input (J28 tip
and ring, it is easiest to connect to the back of the connector.).
3 Set the signal generator to –25 dBu, 1 kHz.
4 Turn on the CH 1 TALK, MIC ON and PANEL MIC buttons.
5 Check the channel 1 output. It should be –0.9 dBu 2 dBu.
Carbon Mic to Channel Test
1 Turn off the PANEL MIC and MIC ON buttons. (Only the CH 1 TALK LED should be on.)
2 Connect a 470 ohm resistor across the CARBON MIC HEADSET jack (J3 tip and ring). The
MIC ON LED should turn on.
3 Remove the signal from the panel mic input, and reconnect it to the CARBON MIC
HEADSET jack.
4 Set the signal generator to 11.2 dBu, 1 kHz.
5 Check the channel 1 output. It should be –0.9 dBu 2 dBu.
6 Remove the 470 ohm resistor from the carbon mic input.
VOX Test
1 Remove the signal from the CARBON MIC HEADSET jack, and reconnect it to the DYN
MIC HEADSET jack mic input (J2 pins 1 & 2).
2 Set the generator to –45 dBu, 1 kHz.
3 Set DIP switch DS8 to the on position (VOX enabled), and note that the MIC ON LED turns
on.
4 Adjust the signal generator output level to zero, and note that the MIC ON LED turns off.
5 Reset DS8 to off.
Mic Kill Receive Test
1 Set all buttons to off.
2 Remove the signal from the DYN MIC HEADSET jack mic input, and reconnect it to intercom
channel 1.
3 Adjust signal generator to –5 dBu, 24 kHz (check frequency with frequency counter).
4 Set the MIC ON button to on.
5 Activate the CH 1 TALK button. The MIC ON LED should turn off.
6 Attenuate the signal input by 20 dB. Try turning on the MIC ON button. It should not turn on.
7 Attenuate the signal an additional 10 dB. Try turning on the MIC ON button. It should turn on.
8 Adjust signal generator to –5 dBu at 22.320 kHz.
9 Try turning the MIC ON button on and off. It should turn on and off as usual.
10Adjust the signal generator to –5 dBu at 23.520 kHz.
4-10 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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11Try turning the MIC ON button on. It should not stay on.
12Adjust signal generator to –5 dBu at 25.680 kHz.
13Try turning the MIC ON button on and off. It should turn on and off as usual.
14Adjust signal generator to –5 dBu at 24.480 kHz.
15Try turning the MIC ON button on. It should not stay on.
16Remove the signal generator from channel 1.
Mic Kill Transmit Test
1 Set all front panel buttons to off.
2 Connect a frequency counter an AC meter to the intercom channel 1 output.
3 Transmit a mic kill signal on intercom channel 1 (tap the CALL button 3 times, then press and
hold the CH 1 TALK key).
4 Check that the signal on the channel 1 output is between 23.7 to 23.9 kHz at –9.8 dBu 2 dBu.
5 Release the CH 1 TALK button.
Call Transmit Test
1 Set all front panel buttons to off.
2 Transmit a call signal on intercom channel 1 (tap the CALL button, and while the call LED is
flashing, press and hold the CH 1 TALK key).
3 Check that the signal on the channel 1 output is between 19.9 to 20.1 kHz at –9.8 dBu 2 dBu.
4 Release the CH 1 TALK button.
Call Receive Test
1 Set all buttons to off.
2 Reconnect the signal generator to intercom channel 1.
3 Adjust signal generator to –5 dBu, 20 kHz (check frequency with frequency counter).
4 Check that the CALL and CH 1 TALK LED’s are flashing.
5 Attenuate the signal input by 20 dB, and check that the LED’s are still flashing.
6 Attenuate the signal an additional 10 dB. The LED’s should stop flashing.
7 Adjust signal generator to –5 dBu, 18.600 kHz.
8 Verify that the LED’s do not flash.
9 Adjust signal generator to –5 dBu, 21.400 kHz.
10Verify that the LED’s do not flash.
11Adjust signal generator to –5 dBu, 19.600 kHz.
12Verify that the LED’s do flash.
13Adjust signal generator to –5 dBu, 20.400 kHz.
14Verify that the LED’s do flash.
15Remove the signal generator and frequency counter.
4-11
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ISO Test
1 Set DIP switch DS3 to off (two-channel, two-wire mode).
2 Set DIP switch DS5 to on (talk muted during ISO).
3 Set all TALK and LISTEN buttons to on.
4 Connect a 100 ohm resistor from the ISO input (J22 pin 12) to circuit common (J22 pin 10).
Observe that the MIC ON LED turns on and the channel 1 and 2 TALK buttons turn off.
5 Remove the 100 ohm resistor across the ISO input.
6 Reset DIP switch DS3 to on and DS5 to off.
Remote Mic Switch Test
1 Set all buttons to off.
2 Connect a 100 ohm resistor from the remote mic switch input (J22 pin 25) to circuit common
(J22 pin 10), and observe that the MIC ON LED turns on.
3 Remove the 100 ohm resistor.
Program Lockout Test
1 Set DIP switch DS4 to on (front panel setup lockout enabled).
2 Press and hold the CALL button for ten seconds, and verify that the MCE325 does not enter
program mode.
3 Reset DS4 to off.
Noise Checks
1 Connect a 150 ohm load across the dynamic mic input (J2 pins 1 and 2).
2 Connect an 8 ohm load across the speaker output.
3 Connect 51 ohm loads across the left headphone output (J2 pins 3 & 4) and right headphone
output (J2 pins 3 &5).
4 Terminate each intercom channel into 200 ohms.
5 Set the MIC ON button to on.
6 Set the SPKR ON button to on.
7 Set all other front panel buttons to off.
8 Set all volume controls to minimum.
Note: Noise measurements in the following steps were made using a 30 kHz low pass filter
with +20 dB of gain inserted between the AC voltmeter and the MCE325.
9 Set the CH 1-3 volume control to maximum. Measure noise across the left headphone output. It
should measure -44 dBu or less.
10Set the CH 1-3 volume control to minimum and set the CH 2-4 volume control to maximum.
Measure noise across the right headphone output. It should measure –44 dBu or less.
11Set the CH 2-4 volume control to minimum. Measure noise across the speaker output. The
meter should read –44 dBu or less.
4-12 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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12Turn on the SPKR ON button. The meter should read –38 dBu or less. Turn off the SPKR ON
button.
NOTE
Noise measurements in the following steps were made using a 400 Hz to 30 kHz bandpass
filter with +40 dB of gain.
13Turn on the MIC ON switch. Measure noise at U1 pin 1 (mic preamp out). The voltmeter
should read –26 dBu or less.
14Turn on the PANEL MIC button. The meter should read –37 dBu or less.
15Turn all buttons off.
16Measure noise at U12 pin 7 (program A preamp out). The voltmeter should read –51 dBu or
less.
17Measure noise at U12 pin 1 (program B preamp out). The voltmeter should read –51 dBu or
less.
18Measure noise across intercom channels 1 through 4. All should measure –50 dBu or less.
4-13
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4-14 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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S E C T I O N
C
HAPTER5
PARTS LISTS
Packaging Assembly (9000-6464-00)
Table 5.1 Reference PD6464 Drawing, Section 6
Item No.
Description
User Manual, MCE325 User Station
Label, Warning
RTS Part No.
9350-6464-00
9170-6739-00
9010-6464-00
9020-6793-00
2705-0020-00
9150-6643-09
9150-6643-10
9150-6643-11
9150-6643-12
9150-6643-13
9150-6643-14
9150-6643-15
9150-6643-16
9150-6643-10
4501-0064-00
1
2
3
4
5
Final Assy, MCE325
Assy, 200-ohm Termination Plug
Keycap, Blank
Keycap, Printed (TALK 3)
Keycap, Printed (TALK 4)
Keycap, Printed (IFB 1)
Keycap, Printed (IFB 2)
Keycap, Printed (LISTEN 3)
Keycap, Printed (LISTEN 4)
Keycap, Printed (SSA 1)
Keycap, Printed (SSA 2)
Keycap, Printed (PAGE)
Keycap, Stem
6
Final Assembly, MCE325 (9010-6464-00)
Table 5.2 Reference AS6464 Drawing, Section 6
Item No.
Description
RTS Part No.
1
2
3
4
5
6
7
8
9
Front Panel Assy, MCE325
Back Panel Assy, MCE325
Case, MCE/MCS
9020-6261-00
9020-6262-00
9060-6260-00
9160-6305-00
1008-4081-00
N/A
MCE/MCS Case Screw
Screw, #4-40 x 1/4
Valox Film, 0.010” Thick
Rubber Stick-on Button
4501-5012-00
Label, Programming and FCC Notice 9170-6776-00
Lug, Solder, #16 1003-0003-00
5-1
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Front Panel Assembly (9020-6261-00)
Table 5.3 Reference AS6261 Drawing, Section 6
Item No. Description
RTS Part No.
1
Bezel, MCE325
9070-6261-00
2
PC Board Assy, Front Panel, MCE325 9030-6246-00
3
Bushing Adapter
9110-6273-00
4501-0064-00
2703-0033-00
2703-0034-00
4501-0061-00
2018-0077-00
4501-0063-00
4501-0062-00
51856-003
5
Keycap Stem
6
Knob, Channel Volume, MCE325
Knob, Program Volume, MCE325
Lightpipe, Button Indicator
Connector Insert, 6-pin Female (J2)
Plug, Panel Microphone
Lightpipe, Call Indicator
Screw, Thread Forming
7
8
9
10
11
12
13
14
15
16
17
20
21
22
23
24
25
26
27
Connector Housing, 3-pin (P1)
59958-003
Phone Jack with Metal Bushing (J28) 2013-0048-00
Connector Housing, 6-pin (P2)
Contact, Housing
59958-006
59958-200
Flex Cable, 0.050” Centers
Keycap, Printed (TALK 1)
Keycap, Printed (LISTEN 1)
Keycap, Printed (TALK 2)
Keycap, Printed (LISTEN 2)
Keycap, Printed (CALL)
Keycap, Printed (PANEL MIC)
Keycap, Printed (SPKR ON)
Keycap, Printed (MIC ON)
2515-0013-00
9150-6643-01
9150-6643-02
9150-6643-03
9150-6643-04
9150-6643-05
9150-6643-06
9150-6643-07
9150-6643-08
5-2 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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Back Panel Assembly (9020-6262-00)
Table 5.4 Reference AS6262 Drawing, Section 6
Item No.
Description
PC Board Assy, Main
RTS Part No.
1
2
9030-6245-00
9020-6324-00
9080-6262-00
Heatsink Assy
Panel, Rear
3
4
Jack, Phone, 3 conductor, double closed circuit (J27) 2013-0003-00
5
Connector Housing (P23)
cord, AC Power, Gray
Strain Relief, Flexible
Fuse, 0.5A, 250V Slo-blo
Fuse Cap
57767-203
6
2504-0004-00
2509-0025-00
50547-015
7
8
9
57074-006
10
11
12
13
15
16
17
Fuse Holder body w/mtg Nut
Terminal, Wire Joint, Nylong
Screw, #4-40 x ¼
2802-0003-00
2017-0013-00
1008-4023-00
1007-0001-00
1007-0002-00
51378-002
Nut, Hex Kep, #4-40
Nut, Hex Kep, #4-40
Lug, Solder, #16
Shrink Tubing
LP
Heatsink Assembly (9020-6324-00)
Table 5.5 Reference 9020-6324-00 Drawing, Section 6
Item No.
Description
RTS Part No.
1
2
3
4
5
6
7
8
9
Heatsink, Model MCE325
IC LM4752T
9180-6324-01
511386000S
Adj. Regulatro, 3 Terminal, LM317T 53290000
Insulator
57896000
1006004000
50013035
1006004100
51845040
51741000
Washer, Nylon Shoulder
Washer
Washer, Compression
Screw PH, Cross
Thermal Compound
Main PC Board Assembly (9030-6245-01)
Table 5.6 Reference 9027-6245-01 Drawing, Section 6
Ref No.
Description
Capacitor, EL, 100µF, 25V
RTS Part No.
C1
51821524
52676113
1514R1022L
52676113
52676113
51821110
C10 Capacitor, CM, 0.1µF, 50V
C100 Capacitor, Mylar, 1nF, 100V
C101 Capacitor, CM, 0.1µF, 50V
C102 Capacitor, CM, 0.1µF, 50V
C103 Capacitor, EL, 10µF, 50V
5-3
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Table 5.6 Reference 9027-6245-01 Drawing, Section 6
C104 Capacitor, CM, 0.1µF, 50V
C105 Capacitor, EL, 100µF, 25V
C106 Capacitor, EL, 4.7µf, 25V
C107 Capacitor, EL, 4.7µf, 25V
C108 Capacitor, EL, 100µF, 25V
C109 Capacitor, EL, 1000µF, 25V
C11 Capacitor, CM, 0.1µF, 50V
C110 Capacitor, CM, 0.1µF, 50V
C111 Capacitor, CM, 0.1µF, 50V
C112 Capacitor, EL, 220µF, 50V
C113 Capacitor, EL, 220µF, 50V
C115 Capacitor, CD, 10pF, 500V
C116 Capacitor, CD, 10pF, 500V
C117 Capacitor, CD, 10pF, 500V
C118 Capacitor, CM, 0.1µF, 50V
C119 Capacitor, Mylar, 0.01µF, 50V
C12 Capacitor, EL, 10µF, 50V
C120 Capacitor, CD, 100pF, 100V
C121 Capacitor, CD, 10pF, 500V
C122 Capacitor, CM, 0.1µF, 50V
C125 Capacitor, EL, 4700µF, 35V
C126 Capacitor, CD, 0.1µF, 500V
C127 Capacitor, EL, 10µF, 50V
C128 Capacitor, EL, 10µF, 50V
C129 Capacitor, EL, 100µF, 25V
C13 Capacitor, CM, 0.1µF, 50V
C130 Capacitor, CM, 0.1µF, 50V
C131 Capacitor, EL, 10µF, 50V
C132 Capacitor, CM, 0.1µF, 50V
C133 Capacitor, EL, 100µF, 25V
C134 Capacitor, CM, 0.1µF, 50V
C135 Capacitor, EL, 22µF, 50V
C136 Capacitor, CM, 0.1µF, 50V
C137 Capacitor, CM, 0.1µF, 50V
C138 Capacitor, CM, 0.1µF, 50V
C139 Capacitor, CM, 0.1µF, 50V
C14 Capacitor, EL, 100µF, 25V
C140 Capacitor, CM, 0.1µF, 50V
C141 Capacitor, CM, 0.1µF, 50V
C142 Capacitor, EL, 4.7µf, 25V
C143 Capacitor, EL, 4.7µf, 25V
C15 Capacitor, Mylar, 150pF, 100V
C16 Capacitor, CM, 0.1µF, 50V
C17 Capacitor, EL, 1µF, 50V
C18 Capacitor, CD, 100pF, 100V
C19 Capacitor, CD, 100pF, 100V
52676113
51821524
51821621
51821622
51821524
51821526
52676113
52676113
52676113
52157534
52157534
52157502
52157502
52157502
52676113
52719007
51821110
1501R1011L
52157502
52676113
1513R4784G
1510R1042Q
51821110
51821110
51821524
52676113
52676113
51821110
52676113
51821524
52676113
51821640
52676113
52676113
52676113
52676113
51821524
52676113
52676113
51821623
51821624
52157332
52676113
51821106
1501R1011L
1501R1011L
5-4 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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Table 5.6 Reference 9027-6245-01 Drawing, Section 6
C2 Capacitor, EL, 10µF, 50V
51821110
1501R1011L
1501R1011L
52676113
C20 Capacitor, CD, 100pF, 100V
C21 Capacitor, CD, 100pF, 100V
C22 Capacitor, CM, 0.1µF, 50V
C23 Capacitor, CD, 10pF, 500V
C24 Capacitor, CM, 0.1µF, 50V
C25 Capacitor, EL, 22µF, 50V
C26 Capacitor, EL, 47µF, 16V
C27 Capacitor, EL, 22µF, 50V
C28 Capacitor, CD, 100pF, 100V
C29 Capacitor, CD, 100pF, 100V
52157502
52676113
51821640
51821068
51821640
1501R1011L
1501R1011L
51821524
C3
Capacitor, EL, 100µF, 25V
C30 Capacitor, CD, 100pF, 100V
C31 Capacitor, CD, 100pF, 100V
C32 Capacitor, CM, 0.1µF, 50V
C33 Capacitor, CD, 10pF, 500V
C34 Capacitor, EL, 47µF, 16V
C35 Capacitor, EL, 22µF, 50V
C36 Capacitor, EL, 22µF, 50V
C37 Capacitor, CD, 100pF, 100V
C38 Capacitor, CD, 100pF, 100V
C39 Capacitor, CD, 100pF, 100V
1501R1011L
1501R1011L
52676113
52157502
51821068
51821640
51821640
1501R1011L
1501R1011L
1501R1011L
52676101
C4
Capacitor, CM, 1nF, 50V
C40 Capacitor, CD, 100pF, 100V
C41 Capacitor, CM, 0.1µF, 50V
C42 Capacitor, CD, 10pF, 500V
C43 Capacitor, CM, 0.1µF, 50V
C44 Capacitor, EL, 22µF, 50V
C45 Capacitor, EL, 47µF, 16V
C46 Capacitor, EL, 22µF, 50V
C47 Capacitor, CD, 100pF, 100V
C48 Capacitor, CD, 100pF, 100V
C49 Capacitor, CD, 100pF, 100V
1501R1011L
52676113
52157502
52676113
51821640
51821068
51821640
1501R1011L
1501R1011L
1501R1011L
51821524
C5
Capacitor, EL, 100µF, 25V
C50 Capacitor, CD, 100pF, 100V
C51 Capacitor, CM, 0.1µF, 50V
C52 Capacitor, CD, 10pF, 500V
C53 Capacitor, EL, 22µF, 50V
C54 Capacitor, EL, 47µF, 16V
C55 Capacitor, EL, 22µF, 50V
C56 Capacitor, CM, 0.1µF, 50V
C57 Capacitor, EL, 22µF, 50V
C58 Capacitor, CM, 0.1µF, 50V
C59 Capacitor, CD, 100pF, 100V
1501R1011L
52676113
52157502
51821640
51821068
51821640
52676113
51821640
52676113
1501R1011L
52676101
C6
Capacitor, CM, 1nF, 50V
C60 Capacitor, EL, 10µF, 50V
51821110
5-5
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Table 5.6 Reference 9027-6245-01 Drawing, Section 6
C61 Capacitor, Mylar, 1nF, 100V
C62 Capacitor, EL, 10µF, 50V
C63 Capacitor, CD, 100pF, 100V
C64 Capacitor, Mylar, 1nF, 100V
C65 Capacitor, CM, 0.1µF, 50V
C66 Capacitor, EL, 10µF, 50V
C67 Capacitor, Mylar, 1nF, 100V
C68 Capacitor, EL, 10µF, 50V
C69 Capacitor, CD, 100pF, 100V
1514R1022L
51821110
1501R1011L
1514R1022L
52676113
51821110
1514R1022L
51821110
1501R1011L
52676101
C7
Capacitor, CM, 1nF, 50V
C70 Capacitor, Mylar, 1nF, 100V
C71 Capacitor, EL, 10µF, 50V
C72 Capacitor, Mylar, 1nF, 100V
C73 Capacitor, EL, 10µF, 50V
C74 Capacitor, CD, 100pF, 100V
C75 Capacitor, Mylar, 1nF, 100V
C76 Capacitor, CM, 0.1µF, 50V
C77 Capacitor, EL, 10µF, 50V
C78 Capacitor, EL, 10µF, 50V
C79 Capacitor, CD, 100pF, 100V
1514R1022L
51821110
1514R1022L
51821110
1501R1011L
1514R1022L
52676113
51821110
51821110
1501R1011L
52676113
C8
Capacitor, CM, 0.1µF, 50V
C80 Capacitor, Mylar, 1nF, 100V
C81 Capacitor, Mylar, 1nF, 100V
C82 Capacitor, EL, 1µF, 50V
C83 Capacitor, EL, 10µF, 50V
C84 Capacitor, CD, 100pF, 100V
C84 500PF
1514R1022L
1514R1022L
51821106
51821110
1501R1011L
52157018
C85 Capacitor, CM, 0.1µF, 50V
C86 Capacitor, EL, 10µF, 50V
C87 Capacitor, EL, 10µF, 50V
C88 Capacitor, CM, 0.1µF, 50V
C89 Capacitor, EL, 10µF, 50V
52676113
51821110
51821110
52676113
51821110
C9
Capacitor, CM, 0.1µF, 50V
52676113
C90 Capacitor, EL, 10µF, 50V
C91 Capacitor, CM, 0.1µF, 50V
C92 Capacitor, Mylar, 1nF, 100V
C93 Capacitor, CM, 0.1µF, 50V
C94 Capacitor, CM, 0.1µF, 50V
C95 Capacitor, EL, 10µF, 50V
C96 Capacitor, CM, 0.1µF, 50V
C97 Capacitor, EL, 100µF, 25V
C98 Capacitor, CM, 0.1µF, 50V
C99 Capacitor, CM, 0.1µF, 50V
CR1 Bridge Rectifier, 4A, 50VRMS
51821110
52676113
1514R1022L
52676113
52676113
51821110
52676113
51821524
52676113
52676113
1601097000
50745005T
50745005T
D1
Diode, 1N4004
D10 Diode, 1N4004
5-6 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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Table 5.6 Reference 9027-6245-01 Drawing, Section 6
D11 Diode, 1N4004
D12 Diode, 1N4004
D13 Diode, 1N4004
D14 Diode, 1N914B
D15 Diode, 1N914B
D16 Diode, 1N914B
50745005T
50745005T
50745005T
160109140B
160109140B
160109140B
160109140B
50745005T
50745005T
50745005T
160109140B
160109140B
160109140B
50745005T
50745005T
50745005T
50745005T
2404000100
2404000100
2404000100
2404000100
59958103
D2
Diode, 1N914B
D20 Diode, 1N4004
D21 Diode, 1N4004
D22 Diode, 1N4004
D3
D4
D5
D6
D7
D8
D9
Diode, 1N914B
Diode, 1N914B
Diode, 1N914B
Diode, 1N4004
Diode, 1N4004
Diode, 1N4004
Diode, 1N4004
FB1 #73 SHIELD BEAD
FB2 #73 SHIELD BEAD
FB3 #73 SHIELD BEAD
FB4 #73 SHIELD BEAD
J1
J10
J14
J15
J16
J17
J18
J19
J2
Connector, 3-pin
Connector, Audio
Jack, PC Mt., 3/8
Jack, PC Mt., 3/8
Header, 3-pin
59893001
2013004900
2013004900
2007009900
2007009900
2007009900
2007013400
59958106
Header, 3-pin
Header, 3-pin
Header, 4-pin
Connector, 6-pin
Header, 4-pin
J20
J21
J22
J23
J24
J3
2007013400
2006009600
2004004000
2007011800
2007009900
2013004900
2007009900
2007009900
2007009900
2007009900
59893001
Connector
Connector, D-Sub, 25-pin
Header, 3-pin
Header, 3-pin
Jack, PC Mt., 3/8
Header, 3-pin
J4
J5
Header, 3-pin
J6
Header, 3-pin
J7
Header, 3-pin
J8
Connector, Audio
Connector, Audio
Transistor, 2N5087
J9
59892001
Q1
1602508700
1602546000
1602521000
1602548400
Q10 Transistor, 2N5460
Q2
Q3
Transistor, 2N5210
Transistor, 2N5484
5-7
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Table 5.6 Reference 9027-6245-01 Drawing, Section 6
Q4
Q5
R1
Transistor, 2N5210
1602521000
1602521000
52154060
54034301
524154028
52154036
1409006000
54035604
54035200
54035604
54035200
52154084
52154065
52154012
54035200
54035100
54035200
52154060
54035100
54035200
54035100
54035200
54035100
524154028
54035200
54035100
54035200
54035100
52154036
54035200
54035100
524154028
54035200
54035100
52154036
524154028
52154077
52154004
52154007
52154020
52154020
52154012
54035200
57148407
524154028
52154305
Transistor, 2N5210
Resistor, CF, 1K Ohm, 5%, 1/8W
R10 Resistor, MF, 3.01K Ohm, 1%, 1/8W
R100 Resistor, CF, 22K Ohm, 5%, 1/8W
R101 Resistor, CF, 10K Ohm, 5%, 1/8W
R104 Trimpot, 10K Ohm, Linear
R105 Resistor, MF, 60.4K Ohm, 1%, 1/8W
R106 Resistor, MF, 20K Ohm, 1%, 1/8W
R107 Resistor, MF, 60.4K Ohm, 1%, 1/8W
R108 Resistor, MF, 20K Ohm, 1%, 1/8W
R109 Resistor, CF, 100 Ohm, 5%, 1/8W
R11 Resistor, CF, 620 Ohm, 5%, 1/8W
R110 Resistor, CF, 100K Ohm, 5% 1/8W
R117 Resistor, MF, 20K Ohm, 1%, 1/8W
R118 Resistor, MF, 10K Ohm, 1%, 1/8W
R119 Resistor, MF, 20K Ohm, 1%, 1/8W
R12
Resistor, CF, 1K Ohm, 5%, 1/8W
R120 Resistor, MF, 10K Ohm, 1%, 1/8W
R124 Resistor, MF, 20K Ohm, 1%, 1/8W
R125 Resistor, MF, 10K Ohm, 1%, 1/8W
R126 Resistor, MF, 20K Ohm, 1%, 1/8W
R127 Resistor, MF, 10K Ohm, 1%, 1/8W
R13 Resistor, CF, 22K Ohm, 5%, 1/8W
R130 Resistor, MF, 20K Ohm, 1%, 1/8W
R131 Resistor, MF, 10K Ohm, 1%, 1/8W
R132 Resistor, MF, 20K Ohm, 1%, 1/8W
R133 Resistor, MF, 10K Ohm, 1%, 1/8W
R135 Resistor, CF, 10K Ohm, 5%, 1/8W
R138 Resistor, MF, 20K Ohm, 1%, 1/8W
R139 Resistor, MF, 10K Ohm, 1%, 1/8W
R14 Resistor, CF, 22K Ohm, 5%, 1/8W
R140 Resistor, MF, 20K Ohm, 1%, 1/8W
R141 Resistor, MF, 10K Ohm, 1%, 1/8W
R142 Resistor, CF, 10K Ohm, 5%, 1/8W
R15 Resistor, CF, 22K Ohm, 5%, 1/8W
R152 Resistor, CF, 200 Ohm, 5%, 1/8W
R153 Resistor, CF, 220K Ohm, 5%, 1/8W
R153 160K
R154 Resistor, CF, 47K Ohm, 5%, 1/8W
R155 Resistor, CF, 47K Ohm, 5%, 1/8W
R156 Resistor, CF, 100K Ohm, 5% 1/8W
R156 Resistor, MF, 20K Ohm, 1%, 1/8W
R157 Trimpot, 20K Ohm, Linear
R16 Resistor, CF, 22K Ohm, 5%, 1/8W
R17 Resistor, CF, 100 Ohm, 5%, 1/4W
5-8 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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Table 5.6 Reference 9027-6245-01 Drawing, Section 6
R170 Resistor, CF, 10K Ohm, 5%, 1/8W
R171 Resistor, CF, 10K Ohm, 5%, 1/8W
R172 Resistor, MF, 201 Ohm, 1%, 1/8W
R173 Resistor, CF, 100K Ohm, 5% 1/8W
R174 Resistor, MF, 201 Ohm, 1%, 1/8W
R175 Resistor, CF, 100K Ohm, 5% 1/8W
R176 Resistor, CF, 22K Ohm, 5%, 1/8W
R177 Resistor, CF, 100K Ohm, 5% 1/8W
R178 Resistor, CF, 1M Ohm, 5%, 1/8W
R18 Resistor, CF, 100 Ohm, 5%, 1/4W
R180 Resistor, CF, 1K Ohm, 5%, 1/8W
R181 Resistor, CF, 2.7 Ohm, 5%, 1/8W
R182 Resistor, CF, 22K Ohm, 5%, 1/8W
R183 Resistor, CF, 10 Ohm, 5%, 1/8W
R184 Resistor, CF, 22K Ohm, 5%, 1/8W
R185 Resistor, CF, 100K Ohm, 5% 1/8W
R186 Resistor, CF, 1K Ohm, 5%, 1/8W
R187 Resistor, CF, 2.7 Ohm, 5%, 1/8W
R188 Resistor, CF, 22K Ohm, 5%, 1/8W
R189 Resistor, CF, 10 Ohm, 5%, 1/8W
R19 Resistor, CF, 620 Ohm, 5%, 1/8W
R198 Resistor, CF, 270K Ohm, 5%, 1/8W
R199 Resistor, CF, 10K Ohm, 5%, 1/8W
52154036
52154036
54032301
52154012
54032301
52154012
524154028
52154012
52154988
52154305
52154060
52154122
524154028
52154108
524154028
52154012
52154060
52154122
524154028
52154108
52154065
52154002
52154036
52154053
52154012
52154980
54034301
52154012
52154036
52154060
52154020
524154028
52154002
52154002
52154036
52154012
524154028
524154028
52154012
52154698
524154028
54034301
54032301
52154004
52154004
54032909
R2
Resistor, Cf, 2K Ohm, 5%, 1/8W
R20 Resistor, CF, 100K Ohm, 5% 1/8W
R200 Resistor, CF, 2.2M Ohm, 5%, 1/8W
R201 Resistor, MF, 3.01K Ohm, 1%, 1/8W
R207 Resistor, CF, 100K Ohm, 5% 1/8W
R208 Resistor, CF, 10K Ohm, 5%, 1/8W
R209 Resistor, CF, 1K Ohm, 5%, 1/8W
R21 Resistor, CF, 47K Ohm, 5%, 1/8W
R211 Resistor, CF, 22K Ohm, 5%, 1/8W
R212 Resistor, CF, 270K Ohm, 5%, 1/8W
R213 Resistor, CF, 270K Ohm, 5%, 1/8W
R214 Resistor, CF, 10K Ohm, 5%, 1/8W
R215 Resistor, CF, 100K Ohm, 5% 1/8W
R22 Resistor, CF, 22K Ohm, 5%, 1/8W
R23 Resistor, CF, 22K Ohm, 5%, 1/8W
R24 Resistor, CF, 100K Ohm, 5% 1/8W
R26 Resistor, CF, 5.1M Ohm, 5%, 1/8W
R261 Resistor, CF, 22K Ohm, 5%, 1/8W
R262 Resistor, MF, 3.01K Ohm, 1%, 1/8W
R263 Resistor, MF, 201 Ohm, 1%, 1/8W
R264 Resistor, CF, 220K Ohm, 5%, 1/8W
R265 Resistor, CF, 220K Ohm, 5%, 1/8W
R266 Resistor, MF, 909 Ohm, 1%, 1/8W
5-9
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Table 5.6 Reference 9027-6245-01 Drawing, Section 6
R267 Resistor, MF, 201 Ohm, 1%, 1/8W
R268 Resistor, CF, 200 Ohm, 5%, 1/8W
R269 Resistor, CF, 10K Ohm, 5%, 1/8W
R27 Resistor, CF, 200 Ohm, 5%, 1/8W
R28 Resistor, CF, 22K Ohm, 5%, 1/8W
R29 Resistor, CF, 5.1M Ohm, 5%, 1/8W
54032301
52154077
52154036
52154077
52154010
52154698
52154084
52154012
52154698
52154012
52154032
524154028
52154012
52154036
57148406
52154084
52154053
52154012
52154025
52154996
52154012
54035200
52154122
52154122
54035200
54035200
52154036
524154028
52154012
52154036
524154028
52154020
524154028
54035200
524154028
1409006000
54035604
54035200
52154060
52154012
54035604
54035200
52154084
52154012
524154028
52154020
R3
Resistor, CF, 100 Ohm, 5%, 1/8W
R30 Resistor, CF, 100K Ohm, 5% 1/8W
R31 Resistor, CF, 5.1M Ohm, 5%, 1/8W
R32 Resistor, CF, 100K Ohm, 5% 1/8W
R33 Resistor, CF, 15K Ohm, 5%, 1/8W
R34 Resistor, CF, 22K Ohm, 5%, 1/8W
R35 Resistor, CF, 100K Ohm, 5% 1/8W
R36 Resistor, CF, 10K Ohm, 5%, 1/8W
R37 Trimpot, 10K Ohm, w/knob
R38 Resistor, CF, 100 Ohm, 5%, 1/8W
R39 Resistor, Cf, 2K Ohm, 5%, 1/8W
R4
Resistor, CF, 100K Ohm, 5% 1/8W
R40 Resistor, CF, 30K Ohm, 5%, 1/8W
R41 Resistor, CF, 470K Ohm, 5%, 1/8W
R42 Resistor, CF, 100K Ohm, 5% 1/8W
R43 Resistor, MF, 20K Ohm, 1%, 1/8W
R44 Resistor, CF, 2.7 Ohm, 5%, 1/8W
R45 Resistor, CF, 2.7 Ohm, 5%, 1/8W
R46 Resistor, MF, 20K Ohm, 1%, 1/8W
R47 Resistor, MF, 20K Ohm, 1%, 1/8W
R48 Resistor, CF, 10K Ohm, 5%, 1/8W
R49 Resistor, CF, 22K Ohm, 5%, 1/8W
R5
Resistor, CF, 100K Ohm, 5% 1/8W
R50 Resistor, CF, 10K Ohm, 5%, 1/8W
R51 Resistor, CF, 22K Ohm, 5%, 1/8W
R52 Resistor, CF, 47K Ohm, 5%, 1/8W
R53 Resistor, CF, 22K Ohm, 5%, 1/8W
R54 Resistor, MF, 20K Ohm, 1%, 1/8W
R55 Resistor, CF, 22K Ohm, 5%, 1/8W
R57 Trimpot, 10K Ohm, Linear
R58 Resistor, MF, 60.4K Ohm, 1%, 1/8W
R59 Resistor, MF, 20K Ohm, 1%, 1/8W
R6
Resistor, CF, 1K Ohm, 5%, 1/8W
R60 Resistor, CF, 100K Ohm, 5% 1/8W
R61 Resistor, MF, 60.4K Ohm, 1%, 1/8W
R62 Resistor, MF, 20K Ohm, 1%, 1/8W
R63 Resistor, CF, 100 Ohm, 5%, 1/8W
R64 Resistor, CF, 100K Ohm, 5% 1/8W
R65 Resistor, CF, 22K Ohm, 5%, 1/8W
R66 Resistor, CF, 47K Ohm, 5%, 1/8W
5-10 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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Table 5.6 Reference 9027-6245-01 Drawing, Section 6
R67 Resistor, CF, 22K Ohm, 5%, 1/8W
R68 Resistor, CF, 22K Ohm, 5%, 1/8W
R69 Resistor, CF, 22K Ohm, 5%, 1/8W
524154028
524154028
524154028
54034150
52154036
1409006000
54035604
54035200
54035604
54035200
52154084
52154012
54034150
524154028
52154020
524154028
524154028
524154028
52154036
1409006000
54035604
54034150
54035200
54035604
54035200
52154084
52154012
524154028
52154020
524154028
524154028
R7
Resistor, MF, 301 Ohm, 1%, 1/8W
R70 Resistor, CF, 10K Ohm, 5%, 1/8W
R73 Trimpot, 10K Ohm, Linear
R74 Resistor, MF, 60.4K Ohm, 1%, 1/8W
R75 Resistor, MF, 20K Ohm, 1%, 1/8W
R76 Resistor, MF, 60.4K Ohm, 1%, 1/8W
R77 Resistor, MF, 20K Ohm, 1%, 1/8W
R78 Resistor, CF, 100 Ohm, 5%, 1/8W
R79 Resistor, CF, 100K Ohm, 5% 1/8W
R8
Resistor, MF, 301 Ohm, 1%, 1/8W
R80 Resistor, CF, 22K Ohm, 5%, 1/8W
R81 Resistor, CF, 47K Ohm, 5%, 1/8W
R82 Resistor, CF, 22K Ohm, 5%, 1/8W
R83 Resistor, CF, 22K Ohm, 5%, 1/8W
R84 Resistor, CF, 22K Ohm, 5%, 1/8W
R85 Resistor, CF, 10K Ohm, 5%, 1/8W
R88 Trimpot, 10K Ohm, Linear
R89 Resistor, MF, 60.4K Ohm, 1%, 1/8W
R9
Resistor, MF, 301 Ohm, 1%, 1/8W
R90 Resistor, MF, 20K Ohm, 1%, 1/8W
R91 Resistor, MF, 60.4K Ohm, 1%, 1/8W
R92 Resistor, MF, 20K Ohm, 1%, 1/8W
R94 Resistor, CF, 100 Ohm, 5%, 1/8W
R95 Resistor, CF, 100K Ohm, 5% 1/8W
R96 Resistor, CF, 22K Ohm, 5%, 1/8W
R97 Resistor, CF, 47K Ohm, 5%, 1/8W
R98 Resistor, CF, 22K Ohm, 5%, 1/8W
R99 Resistor, CF, 22K Ohm, 5%, 1/8W
RP1 Resistor Network, 100K Ohm X4, No Common, 1.1W 1411100302
RP10 Resistor Network, 100K Ohm X4, No Common, 1.1W 1411100302
RP11 Resistor Network, 100K Ohm X4, No Common, 1.1W 1411100302
RP12 Resistor Network, 100K Ohm X4, No Common, 1.1W 1411100302
RP14 Resistor Network, 680 Ohm X 5, No Common, 1.5W
RP15 Resistor Network, 680 Ohm X 5, No Common, 1.5W
1411680000
1411680000
RP2 Resistor Network, 22K Ohm X 9, Pin 1 Common, 1.5W 1411220201
RP3 Resistor Network, 100K Ohm X4, No Common, 1.1W 1411100302
RP5 Resistor Network, 22K Ohm X 9, Pin 1 Common, 1.5W 1411220201
RP6 Resistor Network, 10K Ohm X 4, Pin 1 Common, 0.9W 1411100204
RP7 Resistor Network, 10K Ohm X 4, Pin 1 Common, 0.9W 1411100204
RP8 Resistor Network, 22K Ohm X 9, Pin 1 Common, 1.5W 1411220201
RP9 Resistor Network, 22K Ohm X 9, Pin 1 Common, 1.5W 1411220201
S1
T1
Switch, DIP, Low Profile
R-Core XFMR
1909000200
9020653400
5-11
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Table 5.6 Reference 9027-6245-01 Drawing, Section 6
U1 IC, Dual Low-noise Op-Amp, NE5532N
53295000
U10 IC, Dual Low-noise Op-Amp, NE5532N
U11 IC, Dual Low-noise Op-Amp, TLO76
U12 IC, Dual Low-noise Op-Amp, TLO77
U13 IC, Analog Switch, CD4053BE
U14 IC, Analog Switch, CD4053BE
U15 IC, Analog Switch, CD4053BE
U16 IC, Dual Low-noise Op-Amp, TLO78
U17 IC, Dual Low-noise Op-Amp, NE5532N
U18 IC, Audio Amp, LM386
53295000
1603013500
1603013500
46638P1
46638P1
46638P1
1603013500
53295000
53281000
U19 IC, Audio Amp, LM387
53281000
U2
IC, Analog Switch, CD4053BE
46638P1
U20 IC, Reference, LM833
1603083300
46638P1
U21 IC, Analog Switch, CD4053BE
U22 IC, Undervoltage Sense, MC33064P-5
U23 IC, UCN5821A
1603013700
160358210A
160358210A
160358210A
53290000
U24 IC, UCN5821A
U25 IC, UCN5821A
U27 IC, Voltage Regulator, LM317
U28 IC, EEPROM, 1024 Bit, 93C56AN NA
U29 Assy. Software, Version 1.6
1603013800
9020634816
46638P1
U3
IC, Analog Switch, CD4053BE
U30 IC, Quad 2-input NAND, 4093B
160340930B
46638P1
U4
U5
U6
U7
U8
U9
IC, Analog Switch, CD4053BE
IC, Dual Low-noise Op-Amp, TLO72
IC, Dual Low-noise Op-Amp, TLO73
IC, Dual Low-noise Op-Amp, TLO74
IC, Dual Low-noise Op-Amp, TLO75
IC, Dual Low-noise Op-Amp, NE5532N
1603013500
1603013500
1603013500
1603013500
53295000
XJ16 Jumper
XJ17 Jumper
XJ18 Jumper
XJ19 Jumper
XJ20 Jumper
XJ24 Jumper
XJ4 Jumper
2515001001
2515001001
2515001001
2515001001
2515001001
2515001001
2515001001
2515001001
2515001001
2515001001
53041002
XJ5 Jumper
XJ6 Jumper
XJ7 Jumper
XU1 IC Socket, 8-Pin
XU29 IC Socket, 40-Pin
53041308
Y1
Crystal, 4MHz, 20pF
WASHER FLAT
4-40X1/4
3301000700
52186006
1008402300
1008403500
4-40X3/8
5-12 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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PC Board Assembly, Front Panel (9030-6246-00)
Table 5.7 Reference AS6246 Drawing, Section 6
Ref No.
Description
RTS Part No.
R1-R3 Pot, 10K Ohm, Audio
DS9 LED, Super Bright, Red
1406003901
1801001900
DS1-DS8 LED, Super Bright, Yellow 1801002200
S1-S8 Keyswitch, No LED
J1 Connector
1911004300
2006009600
5-13
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5-14 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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6-2 C S I - 2 0 0 U s e r I n s t r u c t i o n s
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Date: 7/23/01
Time : 05:20:45 PM
DowTnloiatdlefro:mDWw:w\.TSoEmaMnuaPls.c\oAm.SAll6Ma2nu4al6s S_ea0rc1h ABnd.Dcoawnlload.
Date: 7/23/01
Time : 05:27:24 PM
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Title: D:\TEMP\AS6245_01D.cal
Date: 7/23/01
Time : 05:21:25 PM
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Title: D:\TEMP\AS6261_01C.cal
Date: 7/23/01
Time : 05:22:16 PM
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Title: D:\TEMP\AS6262_01C.cal
Date: 7/19/01
Time : 02:05:07 PM
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Title: C:\home\cms\benedil\view\9020-6324_01.DWG
Date: 7/23/01
Time : 05:23:05 PM
DoTwnilotaldefr:omDW:w\wT.SEomManuPals\.cAomS. A6ll M4an6ua4ls_Se0ar1chGAnd.dDowwngload.
Date: 7/23/01
Time : 05:23:33 PM
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Title: D:\TEMP\BD6464_01A.cal
Date: 7/23/01
Time : 05:24:13 PM
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Title: D:\TEMP\IS6718_01A.cal
Date: 7/23/01
Time : 05:24:51 PM
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Title: D:\TEMP\OD6355_01A.cal
Date: 7/23/01
Time : 05:25:30 PM
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Title: D:\TEMP\OD6355_02A.cal
Date: 7/23/01
Time : 05:26:07 PM
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Title: D:\TEMP\OD6355_03A.cal
Date: 7/23/01
Time : 05:26:42 PM
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Title: D:\TEMP\OD6355_04A.cal
Date: 7/23/01
Time : 05:03:09 PM
Title: c:\Dhoownmloadefr\ocmmWwsw.\Sbomeannuaels.dcoiml.\AvlliMeawnua\ls9S0ea0rch0A-n6d D4ow6n4loa_d.01.CAL
5
4
3
2
1
REVISIONS
LOC
REV
A
DESCRIPTION
ECO. NO DRFT CHKR APP DATE
CK 12/7/00
73521
RELEASE TO FACTORY
FRONT PANEL
R1
1K
+4.5V
CHANNEL 1
BILAT
+
C1
100/25
R51
22K
C18
R52
47K
D
C
B
A
R2
2K
R61
60.4K
R62
C25
+
J28
M-114B
CALL 1
(SHT3,5D)
+7V
+14V
+7V
C19
100pF
100pF
J1
R
1
20.0K
1%
U3
C20
22/50
P1
JST-B-3B-ZR
R3
100
C2
4053
1%
2
3
+14V
J8
NC3FDH
+
1
2
3
1
2
3
C24
.1/50
100pF
T
4
X0
X1
Y0
Y1
Z0
Z1
LISTEN BUFFER
CH.1
R53
R55
22K
12
13
2
C26
X
Y
Z
TALK CH.1/4W-A
+14V
S
10/25
R63
C27
5
14
15
4
3
2
1
2
3
+
COM
CH 1
CH 2
+
+
1
U9A
-
PANEL
(SHT2,6D)
LSN1
(SHT3,7D)
22K
TALK
BUFFER
CH.1
5
6
+
PM HI
(SHT2,1D)
MIC
100
22/50
47/16
7
NE5532
U5B
R64
JACK
TALK
CH.2
-
100K
+7V
C32
.1/50
1
TL072
RP2A
22K
J9
NC3MDH
RP2C
22K
-
R58
R59
2
3
(SHT2,1D)
(SHT2,1D)
(SHT2,1D)
REM MIC
MIC LO
MIC HI
R49
R50
10K
5
1
U6A
TALK
CH.3/
LOOP
THRU
+
J6
4WIRE A
PROGRAMMING
1
2
3
+7V
60.4K
1%
C23
10pF
20.0K
1%
D6
1N4004
D7
1N4004
3
(SHT2,2C)
HP L
HP R
4W-B
22K
C21
R57
TL072
(SHT2,2C)
RP1B
RP1C
RP1D
(SHT3,
2D)
(SHT3,
3
5
7
4
6
8
11
10
9
+14V
XX
YY
ZZ
DIFF MIC PRE AMP (+20dB)
TC1
TC2
3
2
1
J24
UNBAL/BAL
+14V
100pF
MIC PROGRAMMING
2D)
2WIRE
4WIRE
C7
10K TRIMPOT VM
LIN
1nF MONO
929647-01-03
UNBAL
1
2
3
100K
DYN
R7
R8
R65
C29
R66
HEADSET
CONN
BAL
CHANNEL 2
BILAT
D15
1N914
CALL 2
R76
R77
C36
929647-01-03
FB3
KEY1
3.01K
1%
J2
47K
+
(SHT3,5D)
C28 100pF
100pF
301
1%
22K
+7V
JST-B-6B-ZR
(SHT2,1D)
KEY2
FB4
#73
C3
+
20.0K
1%
60.4K
1%
C30
22/50
1
2
3
4
5
6
D16
1N914
(SHT2,1D)
R4
100K
100/25
C4
#73
R6
1K
100pF
R68
LISTEN
BUFFER
CH.2
-
R67
22K
6
5
+14V
C34
R78
C35
7
5
+
U1B
1nF MONO
+
+
+
7
U9B
R5
100K
22K
3
6
NE5532
+
U5A
-
(IFB-A)
FB2
#73
FB1
100
22/50
R9
47/16
1
NE5532
C5
LSN2
R79
C22
2
-
100K
(SHT2,6C)
(SHT3,7D)
+
.1/50
R12
1K
TL072
#73
100/25
301
1%
-
R74
R75
6
5
R10
3.01K
1%
R69
7
C6
1nF MONO
U6B
+14V
R13
+
+7V
TL072
60.4K
1%
C33
20.0K
1% 10pF
D8
1N4004
D9
1N4004
+14V
TALK
BUFFER
CH.2
22K
R73
22K
R11
620
Q1
R70
10K
C31
100pF
R80
2N5087
+7V
Q2
+14V
C57
+
10K TRIMPOT VM
LIN
R14
22K
+7V
(SHT3,1B)
CARB MIC
R18
22/50
100 1/4W
C38
100pF
R81
47K
2N5210
CARB
MIC
CONN
R19
620
R16
22K
CALL 3
CHANNEL 3
BILAT
R15
22K
CARBON MIC SENSE
(SHT3,5D)
C37
100pF
22K
R91
60.4K
R92
C44
+
+7V
R17
100 1/4W
J3
(SHT2,6B)
PGMA
SN37A-14B
20.0K
1%
C11
R21
12K
C39
22/50
C10
.1/50
R
1%
1
C41
.1/50
+14V
J10
NC3FDH
RB
2
J4
IFB A
C43
.1/50
100pF
.1/50
R20
100K
D1
1N4004
TB
R82
22K
R83
22K
3
4
5
+14V
1
C9
C45
T
S
(TO CH 3)
R94
C46
+
3
2
1
2
3
+
COM
CH 3
CH 4
.1/50
C12
10/25
+
(IFB-B)
+14V
LISTEN BUFFER
CH.3
1
+
U10A
-
1
2
3
ON
3
2
+
100
22/50
47/16
C56
.1/50
NE5532
LSN3
U7A
OFF
-
U4
R95
100K
(SHT2,6C)
(SHT3,7D)
+7V
C51
.1/50
929647-01-03
TL072
R84
4053
+7V
-
R89
R90
2
3
R85
10K
1
U8A
X0
X1
Y0
Y1
Z0
Z1
+
12
13
2
+7V
TALK
BUFFER
CH.3
60.4K
1%
C42
10pF
3Vpp
X
TALK CH.4
+14V
20.0K
1%
D10
1N4004
D11
1N4004
C136
14
15
4
TL072
(SHT2,7A)
PGMB
+7V
22K
R88
+7V
U2
R23
22K
C40
J5
+14V
4053
R22
22K
.1/50
14
IFB B
(TO CH 4)
J7
Y
4WIRE B
R24
100K
+14V
X0
PROGRAMMING
100pF
12
1
10K TRIMPOT VM
LIN
1
2
3
X
Y
Z
ON
3
2
1
X1
Y0
Y1
Z0
Z1
2WIRE
4WIRE
13
2
5
MIC PRE/LIMITER
OFF
Z
3
929647-01-03
+14V
+7V
5
15
4
929647-01-03
CHANNEL 4
BILAT
R38
100
RP3C
1
6
11
10
9
XX
YY
ZZ
C48
R97
47K
R107
60.4K
R108
C53
R96
22K
C8
.1/50
NE5532
+
RP3B
RP3D
5
3
7
4
8
+7V
CALL 4
C17
3
+
20.0K
1%
+
(SHT3,5D)
100pF
C49
22/50
3
1
U1A
1%
2
C47
100pF
-
TC3
(SHT3,2D)
100K
1/50
11
10
9
XX
YY
ZZ
HMS/PMS
(SHT3,2D)
100pF
R98
R99
22K
C54
LISTEN
BUFFER
CH.4
R109
C55
5
+
USM
+
+
7
U10B
-
(SHT2,4D)
RP2F
22K
TALK
BUFFER
CH.4
5
6
6
RP2I
22K
+
100
22/50
R26
5.1M
R27
200
Q3
J305
R28
RP2E
47/16
1
7
7
NE5532
+14V
LSN4
U7B
6
1
+14V
-
R110
100K
(SHT2,5C)
(SHT3,7D)
+7V
22K
D4
1N914
TL072
R100
TC4
22K
C15
22K
-
R105
R106
6
5
KEY4
(SHT3,2D)
+14V
R101
7
U8B
(SHT2,1D)
D5
1N914
+
+7V
60.4K
1%
C52
10pF
20.0K
1%
D12
1N4004
D13
1N4004
R30
TL072
R29
5.1M
1nF
22K
10K
R104
KEY3
+7V
+14V
C50
100K
(SHT2,1D)
+7V
RP2B
22K
RP2D
22K
+14V
D2
R31
5.1M
R37
(SHT2,6D)
SIDETONE
C16
.1/50
R42
100K
100pF
10K TRIMPOT VM
LIN
1N914
100K
NOTES: SEE SHEET 3 OF 3
+14V
C59
10K TRIMPOT
LIN
+14V
R32
+
D14
C13
.1/50
100pF
R41
VOX REC
(SHT3,1A)
+14V
R33
15K
C14
100/25
+7V
1N914
CHK.
DR.
APP.
Title
THESE DRAWINGS AND SPECIFICATIONS ARE THE
PRPOERTY OF TELEX COMMUINCATIONS, INC.AND
SHALL NOT BE REPRODUCED, COPIED, OR USED
FOR ANY PURPOSE WITHOUT EXPRESS WRITTEN
CONSENT.
470K
R35
100K
R39
2K
C58
CK
Q5
2N5210
R34
22K
D3
DATE
SCALE
SCHEMATIC DIAGRAM
.1/50
7/15/01
1N914
2N5210
MOTHERBOARD MCE325
R40
30K
R36
10K
DO NOT SCALE DRAWING
Q4
P/N
DWG. NO.
SIZE
9027624501
TELEX
D
Sheet
COMMUNICATIONS, INC.
of
1 3
ORCAD GENERATED DRAWING
FILE NAME: J/IC_GROUP/ECAD/SCHEMATIC/6245
PLANT DIST:
B.E.
BURNSVILLE, MINNESOTA
5
4
3
2
1
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5
4
3
2
1
+14V
+7V
C61
U13
4053
J22
745783-3
+14V
D
C
B
A
D
C
B
A
X0
X1
Y0
Y1
Z0
Z1
1nF
C60
+
R117
R118
RP6B
12
13
2
SIDETONE
X
Y
Z
USMB
14
15
4
3
2
4
1
13
25
12
24
11
23
10
22
9
21
8
20
7
19
6
18
5
17
4
16
3
15
2
14
1
4W-A LO
+14V IN
ISO
(SHT1,6A)
C88
.1/50
SPKR MUTE
REM MIC
+18V IN
4W-B LO
4W-A LO
KEY4
10.0K
1%
NE5532
10K
(1D)
10/25
20.0K
1%
4W-A LSN
RP6A
R172
C89
1
3
2
+7V
+
COM
+
1
1
U17A
-
4 WIRE A IN
10K
RP6C
COM
0dBu NOM
(-10dBu TO
+8dBu)
301
1%
C63
100pF
10/25
R173
100K
-
6
5
5
LSN1
(-6dBu NOM)
7
1
U11B
4W-B HI
4W-A HI
KEY3
(SHT1,4D)
(SHT3,7D)
-4dBu NOM
(+6dBu pK)
+
R170
10K
R171
10K
3
10K
TL072
(SHT1,6B)
C62
+
R119
RP6D
R174
C90
11
10
9
XX
YY
ZZ
STC
+
5
1
4W-A HI
USM
(SHT3,2D)
C87
+
KEY2
(1D)
10K
301
1%
R175
100K
10/25
20.0K
1%
10/25
10/25
KEY1
LIST1
J21
R120
10.0K
1%
C64
1nF
MOLEX FFC
39-51-3304
(SHT3,2D)
HP COM
MIC LO
PM HI
MIC HI
CHS GND
PM COM
RP5A
22K
30
29
28
27
26
25
24
23
22
21
22
RP5B
22K
RP5I
22K
(R1)
VOL 1
J19
929647-01-04
+7V
PGM L
C67
(6A)
R177
100K
TC2
1
2
3
4
(R3)
PGM
VOL
(1D)(SHT1,6D)
(SHT3,2D)
1nF
+14V
C66
+
R124
R125
C97
4W-B LO
R176
C91
LM386
5
100/25
+
10.0K
1%
(1D)
10/25
20.0K
1%
2
3
R183
10
+14V
C137
.1/50
(R2)
VOL 2
U18
U14
4053
.1/50
22K
R181
2.7
TL072
C93
.1/50
4 WIRE B IN
C65
+7V
C92
1nF
C94
C95
HP L
(SHT1,8D)
.1/50
0dBu NOM
(-10dBu TO
+8dBu)
(SEE SD6246)
10K AUDIO POT
3 REQD
C69
100pF
-
R182
22K
2
3
10/25
4W-B LSN
X0
1
12
13
2
+
U11A
LSN3
X
.1/50
+
14
(SHT1,4B)
(SHT3,7D)
X1
Y0
Y1
Z0
Z1
+14V
C96
.1/50
C68
+
R126
R180
1K
(-6dBu NOM)
+14V
4W-B HI
(SHT1,1C)
2N5460
Q10
Y
Z
MONO SW
15
4
(1D)
10/25
20.0K
1%
R178
1M
1
RP7A
C86
MONO
+
R127
10.0K
1%
C70
1nF
5
2
1
LSN2
(SHT3,5D)
10K
RP7B
(SHT1,4C)
(SHT3,7D)
10/25
3
C98
.1/50
11
10
9
3
4
5
1
XX
YY
ZZ
LIST3
(SHT3,2D)
+7V
10K
RP7C
PROGRAM A
1
LIST2
(SHT3,2D)
10K
C141
.1/50
+14V
C72
C105
100/25
+
J14
SN37A-14B
RP7D
R184
C99
RP5H
22K
RP5G
22K
RP5C
22K
LM386
U15
4053
R189
10
1
2
(1D)(SHT1,5A)
(SHT3,2D)
1nF
C71
+
R130
R131
5
U19
R
(SHT3,7D)
10K
22K
.1/50
C100
1nF
R185
100K
1
3
X0
X1
Y0
Y1
Z0
Z1
R187
2.7
RB
2
12
13
2
C101
.1/50
TC4
1
2
3
4
LSN4
10.0K
1%
X
10/25
+14V
TB
20.0K
1%
C103
10/25
3
4
5
14
15
4
C102
.1/50
HP R
(SHT1,4A)
T
S
R188
22K
PGMA
(SHT1,8C)
+
J20
(SHT1,5B)
+14V
Y
Z
+14V
929647-01-04
C104
.1/50
C74
100pF
-
R135
6
5
1
R186
1K
7
U12B
PGM R
+
5
RP5F
RP5E
22K
(6A)
RP5D
22K
10K
TL072
22K
+14V
C73
+
R132
3
+7V
(SHT3,2D)
+7V
11
10
9
XX
YY
ZZ
LIST4
R48
10K
10/25
20.0K
1%
U33B
(SHT3,2D)
SPKR ON
R133
10.0K
1%
C75
1nF
5
C107
4.7uF
+
-
7
C143
4.7uF
SPKR DIM
PROGRAM B
6
(SHT3,2D)
REAR PANEL
R43
20K
LM833
SPKR JACK
+7V
C81
J23
MLSS100-3
J27
J15
SN37A-14B
U34
C82
+
MN-114B
R
1nF
C77
+
R138
R139
P23
1
2
3
4
5
R
1
6
7
1
1
2
3
1
2
3
INA
INB
OUTA
OUTB
R157
R47
RB
1/50
2
2
5
3
T
S
10.0K 1%
20K
SPKR DIM
ADJUST
(MIN=6dB
MAX=26dB)
10/25
TB
20.0K
1%
3
4
5
T
S
C113
BIAS
VCC
LM4752/TO
20K TRIMPOT
LIN
R152
200
270pF
+14V
C76
.1/50
4
C79
100pF
-
R142
10K
2
3
1
U12A
+
TL072
C78
+
R140
C84
U31A
1
C109
1000uF
R153
160K
C142
4.7uF
PGMB
3
2
C106
4.7uF
+
-
500pF
20K
(SHT1,6B)
R44
10/25
20.0K
1%
E1
E2
R45
2.7
R156
+14V
R46
20K
2.7
R141
10.0K
1%
C80
1nF
R154
LM833
17-25VDC SOURCE
J16
929647-01-03
47K
R25
10K
ON
C83
10/25
+7V
+7V
R155
C108
100uF
C110
0.1uF
C111
0.1uF
1
2
3
PGM ASSIGN
TO HDST L
+
-
6
5
PGM L
7
U16B
OFF
(4D)
R54
+
47K
20K
TL072
C112
J17
929647-01-03
+7V
ON
270pF
1
2
3
PGM ASSIGN
TO HDST R
PGM R
(4B)
OFF
NOTES: SEE SHEET 3 OF 3
J18
929647-01-03
R56
0
1
2
3
PGM ASSIGN
TO SPEAKER
PAGE
Title
MOTHER BOARD MCE325 2
REV
DWG. NO.
A
9027624501
5
4
3
2
1
Download from Www.Somanuals.com. All Manuals Search And Download.
5
4
3
2
1
U23
1
2
6
7
16
15
14
13
12
11
10
9
(SHT1,6D)
(SHT1,6D)
(SHT1,6A)
(SHT1,5A)
(SHT2,6B)
(SHT1,8B)
(SHT2,6D)
TC1
TC2
TC3
TC4
SPKR ON
HMS/PMS
STC
CLK
DI
STR
EN
D0
D1
D2
D3
D4
D5
D6
D7
+5V
CALL LIGHT MUX
R198
270K
C134
.1/50
+5V
C139
5
DO
7
D
C
B
A
D
C
B
A
U30A
4093
SPKR DIM
(SHT2,6B)
C140
.1/50
40
+14V
U29
.1/50
2
1
U21
4053
3
3
8
4
+5V
.
VCC
3
39
38
VOX IN
VPP
OSC1
OSC2
Y1
4.00MHz
VDD
R200
2.2M
GND
X0
X1
Y0
Y1
Z0
Z1
(2A)
12
13
2
28
27
26
25
24
23
22
21
C115
10pF
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
X
14
UCN5821A
14
15
4
+5V
11
10
9
8
7
6
5
4
C116
10pF
(SHT2,3C)
(SHT1,4D)
(SHT1,4C)
(SHT1,4C)
(SHT1,4B)
MONO
CALL 1
CALL 2
CALL 3
CALL 4
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
U24
(SHT1,4D)
,(SHT2,5D)
LSN1
LSN2
LSN3
LSN4
Y
Z
1
2
6
7
16
15
14
13
12
11
10
9
(SHT2,6D)
LIST1
LIST2
LIST3
LIST4
CALL CTL1
CALL CTL2
CLK
DI
STR
D0
D1
D2
D3
D4
D5
D6
D7
1
(SHT1,4C),(SHT2,5C)
(SHT1,4B),(SHT2,6C)
(SHT1,4B),(SHT2,5C)
(SHT2,7C)
(SHT2,7C)
(SHT2,6B)
(7D)
5
EN
+5V
3
5
(7D)
DO
.
29
30
31
32
33
34
35
36
(2B)
DSW5
PD0/RDI
+14V
11
10
9
12
13
14
15
16
17
18
19
XX
YY
ZZ
(TO 2D)
CALL CTL1
CALL CTL2
PD1/TDO
PD2/MISO
PD3/MOSI
PD4/SCK
PD5/SS
TCMP
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
+14V
E16
R199
10K
3
8
4
(TO 2D)
+17-25VDC
VCC
E10
E11
E13
GND
E14
RP2G
22K
+5V
E15
(AUDIBLE)
RP2H
22K
UCN5821A
DSW7
PD7
J21
39-51-3304
MOLEX FFC
1
2
3
4
5
6
7
8
9
+5V
37
2
TCAP
IRQ
E12
U25
1
+5V
+
RESET
VSS
+14V
RP14A
RP14B
RP14C
RP14D
RP14E
RP15B
RP15C
RP15D
RP15E
680
680
680
680
680
680
680
680
680
1
16
1
3
5
7
9
3
5
7
9
2
4
6
8
C135
22/50
MIC ON
SPKR ON
PANEL MIC
CALL LIGHT
CH 4
CH 3
CH 2
CLK
2
D0
D1
D2
D3
D4
D5
D6
D7
C117
15
14
13
12
11
10
9
DI
6
STR
7
MC68HC7058
10pF
R207
EN
20
FRONT
PANEL
LEDS
10
5
4
6
8
DO
+5V
C118
.1/50
+5V
CH 1
CALL RED
100K
10
10
R201
3.01K
R212
270K
U30B
4093
3
.
4
+5V
VCC
C119
C85
.1/50
R208
5
6
1%
-
C120
R211
22K
2
3
4
8
GND
1
U16A
10K
R215
100K
.01/50
+
UCN5821A
TL072
100pF
MYLAR
U22
MC33064
C121
10pF
R214
R209
1K
+5V
2
1
R213
270K
+14V
IN
RSET
10K
+7V
J21
39-51-3304
MOLEX FFC
RP8A
22K
RP8B
22K
RP8C
22K
RP8D
22K
RP8E
22K
RP8F
22K
RP8G
22K
RP8H
22K
RP8I
22K
C122
.1/50
N.C.
11
12
13
14
15
16
17
18
19
20
RP10B
RP10A
RP10C
RP10D
RP11D
RP11C
RP11B
RP11A
100K
4
6
7
3
3
5
8
4
MIC ON
SPKR ON
PANEL MIC
CALL LIGHT
CH 4
CH 3
CH 2
CH 1
100K
1
8
5
1
2
+5V
100K
FRONT
PANEL
SWITCHES
C138
100K
7
100K
100K
6
.1/50
4
100K
100K
2
3
1
2
O
I
S
C
U30C
U28
8
9
93C56
10
+5V
RP9H
22K
RP9F
22K
RP9G
22K
RP9A
22K
RP9B
22K
RP9C
22K
RP9D
22K
RP9E
22K
4093
RP9I
22K
(SHT1,8D)
(SHT2,1D)
(SHT1,7C)
(SHT2,1D)
(SHT2,1D)
RP12A
RP12B
RP12C
RP12D
100K
100K
100K
100K
U30D
4093
1
3
5
7
2
4
6
8
REM MIC
CARB MIC
ISO
SPKR MUTE
S1
12
13
11
K40-8S
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
(5D)
(5D)
DSW5
ANALOG MID
VOLTAGE
DSW7
VOX IN
R264
220K
C129
100/25
(7D)
+
-
+
6
5
7
+7V
SOURCE
U17B
OFF
ON
17-25VDC SOURCE
R269
10K
NE5532
D21
REAR PANEL MOUNTED
R265
220K
+18V IN
(SHT2,1D)
E6
VOX REC
T1
TO-10R-RT
15VA
1N4004
D20
1N4004
(SHT1,1D)
+14V IN
(SHT1,4A)
CR1
KBL005
SOURCE
+14V
+5V
F1
R268
200
1
2
SOURCE
+4.5V
(TO ELECTRET PANEL
MIC VIA NETWORK)
50VRRM
4.0A
HOT
HEATSINK
D22
1N4004
0.5A SBLO
LM317T
U27
IN
15VAC
15VAC
LM317T
E7
U26
-
+
4
2
3
2
3
2
SOURCE
(TO DIGITAL IC'S)
+5V
IN
OUT
OUT
AC PLUG
EARTH
R263
301
1%
R267
301
1%
+
3
+
+
C133
100/25
C125
4700/35
C128
10/25
C130
.1/50
C132
.1/50
E8
+
+
909
1%
3.01K
1%
NEUTRAL
R262
C127
10/25
R266
C131
10/25
E9
GND TP
R261
22K
C126
.1/500
2. CAPACITANCE VALUES ARE SHOWN IN MICROFARADS/VOLTS.
1. ALL RESISTORS ARE CARBON FILM,1/8W,5%.
NOTES: UNLESS OTHERWISE SPECIFIED
PAGE
Title
MOTHER BOARD MCE325 3
REV
DWG. NO.
A
9027624501
5
4
3
2
1
Download from Www.Somanuals.com. All Manuals Search And Download.
Date: 7/23/01
Time : 05:19:08 PM
Download from Www.Somanuals.com. All Manuals Search And Download.
Title: D:\TEMP\SD6246_01A.cal
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