JVC AV 20N3 User Manual

AV-20N3  
AV-20NMG3  
AV-20NMG3B  
SERVICE MANUAL  
COLOUR TELEVISION  
BASIC CHASSIS  
/D  
AV-20N3/AV-20N3  
CG  
AV-20NMG3/AV-20NMG3B  
/AV-20NMG3/-A  
[
RM-C364GY ]  
[ RM-C364 ]  
CONTENTS  
!
!
・  
SPECIFICATIONS  
2
SAFETY PRECAUTIONS ・・3  
! FEATURES4  
! FUNCTIONS・・5  
!
MAIN DIFFERENCE LIST ・・7  
! SPECIFIC SERVICE INSTRUCTIONS ・・8  
!
!
・  
15  
SERVICE ADJUSTMENTS  
PARTS LIST ・・33  
OPERATING INSTRUCTIONS  
STANDARD CIRCUIT DIAGRAM ・・2-1  
1
No. 52025  
Jun. 2002  
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
SAFETY PRECAUTIONS  
1. The design of this product contains special hardware, many  
circuits and components specially for safety purposes. For  
continued protection, no changes should be made to the original  
design unless authorized in writing by the manufacturer.  
Replacement parts must be identic al to thos e used in the original  
circuits. Service should be performed by qualified pers onnel  
only.  
9. Isolation Check  
(Safety for Electrical Shock Hazard)  
After re-ass embling the product, always perform an isolation  
check on the exposed metal parts of the cabinet (antenna  
terminals, video/audio input and output terminals, Control knobs,  
metal cabinet, screwheads, earphone jack, control shafts, etc.)  
to be sure the product is s afe to operate without danger of  
electrical shoc k.  
2. Alterations of the design or circuitry of the products should not be  
made. Any design alterations or additions will void the  
manufacturer's warranty and will further relieve the manufacturer  
of responsibility for personal injury or property damage resulting  
therefrom.  
(1) Dielectric Strength Test  
The isolation between the AC primary circuit and all metal parts  
exposed to the us er, particularly any expos ed metal part having a  
return path to the chass is should withs tand a voltage of 3000V  
AC (r.m.s.) for a period of one second.  
(. . . . Withstand a voltage of 1100V AC (r.m. s.) to an applianc e  
rated up to 120V, and 3000V AC (r.m. s.) to an appliance rated  
200V or more, for a period of one second.)  
This method of test requires a test equipment not generally found  
in the servic e trade.  
3. Many electrical and mechanical parts in the products have  
special safety-related characteristics. These characteristics are  
often not evident from visual inspection nor can the protection  
afforded by them necessarily be obtained by using replacement  
components rated for higher voltage, wattage, etc. Replacement  
parts whic h have these special s afety characteristics are  
identified in the parts list of Service manual. Electrical  
components having such features are identified by shading  
on the schematics and by (!) on the parts list in Service  
manual. The us e of a substitute replacement which does not  
have the same safety characteristics as the recommended  
replac ement part shown in the parts list of Service manual may  
cause shock, fire, or other hazards.  
(2) Leakage Current Check  
Plug the AC line c ord directly into the AC outlet (do not use a line  
isolation transformer during this check.). Using a " Leakage  
Current Tester", measure the leakage current from each exposed  
metal part of the cabinet, particularly any expos ed metal part  
having a return path to the chassis , to a known good earth  
ground (water pipe, etc.). Any leakage current must not exceed  
0.5mA AC (r.m.s.).  
However, in tropic al area, this must not exceed 0.2mA AC  
(r.m.s.).  
4. Don't short between the LIVE side ground and ISOLATED  
(NEUTRAL) side ground or EARTH side ground when  
repairing.  
" Alternate Check Method  
Plug the AC line c ord directly into the AC outlet (do not use a line  
isolation transformer during this check.). Use an AC voltmeter  
having 1000 ohms per volt or more sens itivity in the following  
manner. Connec t a 150010W res istor paralleled by a 0.15µF  
AC-type c apacitor between an exposed metal part and a known  
good earth ground (water pipe, etc.). Meas ure the AC voltage  
across the res istor with the AC voltmeter. Move the resistor  
connec tion to each exposed metal part, particularly any exposed  
metal part having a return path to the chassis, and measure the  
AC voltage ac ross the res istor. Now, reverse the plug in the AC  
outlet and repeat eac h measurement. Any voltage measured  
must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA  
AC (r.m.s.).  
Some model's power circuit is partly different in the GND. The  
differenc e of the GND is shown by the LIVE : (") side GND, the  
ISOLATED(NEUTRAL) : (#) side GND and EARTH : ($) side  
GND. Don't short between the LIVE side GND and  
ISOLATED(NEUTRAL) side GND or EARTH side GND and  
never measure with a measuring apparatus (oscilloscope etc.)  
the LIVE side GND and ISOLATED(NEUTRAL) side GND or  
EARTH side GND at the same time.  
If above note will not be kept, a fuse or any parts will be broken.  
5. If any repair has been made to the chassis, it is recommended  
that the B1 setting should be checked or adjusted (See  
ADJUSTMENT OF B1 POWER SUPPLY).  
However, in tropical area, this must not exceed 0.3V AC ( r.m.s.).  
This corresponds to 0.2mA AC (r.m.s.).  
6. The high voltage applied to the picture tube must conform with  
that specified in Service manual. Excessive high voltage can  
cause an increase in X-Ray emission, arcing and possible  
component damage, therefore operation under excessive high  
voltage conditions should be kept to a minimum, or should be  
prevented. If s evere arc ing occurs, remove the AC power  
immediately and determine the cause by visual inspection  
(incorrect installation, cracked or melted high voltage harness,  
poor soldering, etc.). To maintain the proper minimum level of  
soft X-Ray emission, c omponents in the high voltage circuitry  
including the picture tube must be the exact replacements or  
alternatives approved by the manufacturer of the c omplete  
product.  
ACVOLTMETER  
(HAVING 1000 /V,  
OR MORE SENSITIVITY)  
0.15μF AC-TYPE  
PLACE THIS PROBE  
ON EACH EXPO SED  
MET AL PART  
1500 10W  
GOODEARTH GROUND  
7. Do not c hec k high voltage by drawing an arc. Use a high voltage  
meter or a high v oltage probe with a VTVM. Discharge the  
picture tube before attempting meter connection, by connecting  
a clip lead to the ground frame and c onnecting the other end of  
the lead through a 10k2W resistor to the anode button.  
8. When service is required, observe the original lead dress. Extra  
prec aution should be given to assure correct lead dress in the  
high voltage circuit area. W here a s hort circuit has occurred,  
those components that indicate evidence of overheating should  
be replaced. Always use the manufacturer's replacement  
components.  
No.52025  
3
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
FEATURES  
"
"
New chassis design enables us e of an interactive on-screen c ontrol.  
Wide range voltage (110V240V) AC power input.  
" With AUDIO / VIDEO INPUT & OUTPUT terminal.  
"
MUTING button can reduce the audio level to zero instantly.  
" Functional remote control to operate T V set (for channel select, volume c ontrol, power ON/OFF, etc. ) from a distanc e.  
I2C bus control utilizes single chip ICs for IF, V/C, DEF. VSM PRESET, PRESET & SETUP TOUR.  
"
" By means of AUTO PROGRAM, the TV s tations c an be s elected automatically and the TV channels can also be rearranged automatically.  
" Built-in ECO MODE (ECONOMY, ECOLOGY)  
In accordanc e with the brightness in a room, the brightness and / of contrast of the picture can be adjusted automatic ally to make the  
optimum picture which is eas y on the eye.  
"
Built – in ON TIMER, RETURN + & CHILD LOCK.  
SYSTEM BLOCK DIAGRAM  
IC301  
VIDEO/CHROMA  
DECORDER  
TU001  
TUNER  
IC702  
MEMORY  
IC701  
SCL1/SDA1  
MICRO  
COMPUTER  
SCL2/SDA2  
4
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
FUNCTIONS  
FRONT PANEL  
MENU buttons  
1
2
3
4
5
6
7
8
9
- +  
/
CHANNEL  
VOLUME  
buttons  
buttons  
- +  
/
AI ECO sensor  
REMOTE CONTROL s ens or  
ON TIMER lamp  
POWER lamp  
MAIN POWER button  
A/V INPUT terminal  
10 HEADPHONE jack  
7
10  
9
1
2
3
4
5
6
8
REAR TERMINAL  
ANT Terminal  
1
2
3
4
5
2
3
VIDEO INPUT Terminal  
VIDEO OUTPUT Terminal  
AUDIO INPUT T erminal  
AUDIO OUT PUT Terminal  
1
4
5
No. 52025  
5
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
REMOTE CONTROL UNIT  
/D  
/-A  
RM-C364GY : AV-20N3 / AV-20N3 / AV-20NMG3 / AV-20NMG3  
RM-C364 : AV-20NMG3B  
ECO SENSOR key  
SOUND SYSTEM key  
COLOUR SYSTEM key  
TV/VIDEO key  
1
2
1
2
10  
11  
3
4
3
4
OFF TIMER key  
5
6
12  
5
CHANNEL SCAN k ey  
RETURNkey  
7
8
6
7
8
DISPLAY key  
13  
14  
15  
CHANNEL key  
9
10 POWER key  
PICTURE MODE key  
Number (CH.) key  
11  
12  
16  
9
13 /--key  
14 MUTING key  
MENU key  
15  
MENU /key  
MENU /key  
16 VOLUME/key  
Except for difference in body colour, the Remote Control  
Unit RM-C364GY and RM-C364 have exactly the same  
Func tions.  
6
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
MAIN DIFFERENCE LIST  
Part Name  
Main PWB  
Remote Control Unit  
Front Cabinet  
Rating Label  
LC20377-010B-H  
Model Name  
AV-20N3  
SCG-1403A-H2  
SCG-1425A-H2  
RM-C364GY-1H  
LC10438-027A-H  
/D  
AV-20N3  
AV-20NMG3  
SCG-1422A-H2  
LC10438-029A-H  
LC10438-033A-H  
LC10438-029A-H  
AV-20NMG3B  
RM-C364-1H  
/-A  
AV-20NMG3  
RM-C364GY-1H  
LC20413-002B-H  
Part Name  
Picture Tube  
A48LWX10X  
Inst Book  
Digest Manual  
Model Name  
AV-20N3  
LCT1188-001A-H  
LCT1189-001A-H  
AV-20N3/D  
AV-20NMG3  
AV-20NMG3B  
A48LDD095X  
LCT1196-001A-H  
LCT1197-001A-H  
/-A  
AV-20NMG3  
Intermediate  
Frequency  
[SIF Carrier ]  
Item  
Col our Sy st em  
[RF Mode]  
TV RF System  
B/G, I, D/K  
OSD Language  
Model Name  
AV-20N3  
32.5MHz (5.5MHz)  
31.5MHz (6.5MHz)  
PAL / SECAM  
E / R  
32.0MHz (6.0MHz)  
AV-20N3/D  
E / C / M / I  
32.5MHz (5.5MHz)  
33.5MHz (4.5MHz)  
31.5MHz (6.5MHz)  
32.0MHz (6.0MHz)  
PAL / SECAM  
AV-20NMG3  
B/G, I, D/K,M  
E / R / A / P  
NTSC3.58 / NTSC4.43  
AV-20NMG3B  
/-A  
AV-20NMG3  
No. 52025  
7
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
SPECIFIC SERVICE INSTRUCTIONS  
DISASSEMBLY PROCEDURE  
REMOVING THE REAR COVER  
1. Unplug the power plug.  
!
2. As shown in figure, remove the 6 screws marked  
and a  
screw marked ".  
3. Withdraw the rear cover toward you.  
REMOVING THE MAIN PW BOARD  
"
After removing the rear cover.  
1. Slightly raise the both sides of the MAIN PW BOARD by hand.  
2. Withdraw the MAIN PW BOARD backward.  
(If necess ary, take off the wire clamp, c onnectors etc. )  
REMOVING THE SPEAKER  
"
After removing the rear cover.  
#
1. As shown in figure, remove the 2screws marked  
.
2. Follow the s ame steps when removing the other hand speak er.  
CHECKING THE MAIN PW BOARD  
1. To check the back side of the PW Board.  
1) Pull out the MAIN PW Board. (Refer to REMOVING THE MAIN  
PW Board)  
2) Erect the PW Board vertic ally so that you can easily check the  
back side of the PW Board.  
[CAUTION]  
"
"
When erecting the PW Board, be careful s o that there will be no  
contacting with other PW Board.  
Before turning on power, make sure that the CRT earth wire and  
other connector are properly c onnected.  
WIRE CLAMPING AND CABLE TYING  
1. Be sure to clamp the wire.  
2. Never remove the c able tie used for tying the wires together.  
Should it be inadvertently removed, be sure to tie the wires with a  
new cable tie.  
8
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
FRONT CABI.  
SPEAKER  
CRT SOCKET  
PWB  
C
(×2)  
MAIN PWB  
SPEAKER  
C
(×2)  
POWER  
CORD  
REAR  
COVER  
B
(×1)  
A
(×6)  
No. 52025  
9
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
REPLACEMENT OF MEMORY ICs  
1. MEMORY ICs  
This model uses memory ICs. This memory IC data are for proper operation of the video and deflection circuits.  
When replacing memory ICs, be sure to us e ICs written with the initial values of data.  
2. PROCEDURE FOR REPLACING MEMORY ICs  
SERVICE MENU  
(1) Power off  
1.IF  
2.V/C  
Switch the power off and disconnect the power plug from the wall outlet.  
(2) Replace ICs  
3.DEF  
5.PRESET  
6.SETUP TOUR OFF  
4.VSM PRESET  
Be sure to use memory ICs written with the initial data values.  
(3) Power on  
1-6 SELECT  
****** *****  
DISP :EXIT  
** ***  
.
*** ** ** ** ***  
Connect the power plug into the wall outlet and switch the power on.  
(4) Check and set SYSTEM CONSTANT SET  
It must not adjust without adjustment signals.  
Fig.1  
1) Press the DISPLAY key and the PICTURE MODE key of the REMOTE  
CONTROL UNIT simultaneously.  
2) The SERVICE MENU screen of Fig. 1 will be displayed.  
3) While the SERVICE MENU is displayed, again press the DISPLAY key and  
PICTURE MODE key simultaneously, and the SYSTEM CONSTANT SET  
screen of Fig. 2 will be displayed.  
SYSTEM CONSTANT-  
SYSTEM CONSTANT SET  
1
4) Check the setting values of the SYSTEM CONSTANT SET of T able 1 If the  
value is different, select the setting item with the MENU /key, and set  
***  
COLOUR  
:
BILINGUAL  
TUNE R  
ECO SENSOR  
LANGUAGE  
: NO  
: MU  
: YES  
the correct value with the MENU- / + key.  
5) Press the DISPLAY key twice, and return to the normal screen.  
(5) Receive channel of setting  
:
***  
Refer to the OPERATING INST RUCTIONS and set the receive channels  
(channels preset) as described  
/
:SELECT  
- / + : OPERATE  
DISP : EXIT  
(6) User Setting  
SYSTEM CONSTANT-  
Check the us er s etting value of Table 2, and if setting value is different, set  
the correct value.  
For setting, refer to the OPERATING INSTRUCTIONS.  
(7) Setting of SERVICE MENU  
SYSTEM CONSTANT SET  
2
B/B SOUND  
LOCK  
COLOUR AUTO  
QSS  
:
***  
: 180  
:
: MINT  
: NO  
Verify the setting items of the SERVICE MENU, and reset where necessary.  
For setting, refer to the SERVICE ADJUSTMENTS.  
***  
ALC  
TEXT RATE  
:SELECT  
- / + : OPERATE  
: 20  
KEY ASSIGNMENT OF REMOTE CONTROL UNIT  
/
DISP : EXIT  
SYSTEM CONSTANT-Ⅲ  
PICTURE  
MO DE key  
SYSTEMCONSTANT SET  
3
AMP TUNER  
VNR  
TEXT TABLE  
VOLUM PWM  
: NO  
: YES  
: CYL  
: POS  
NUMBERS  
key  
:SELECT  
- / + : OPERATE  
/
DISP: EXIT  
DISPLAY  
key  
MENU  
key  
/
▼ ▲  
MENU  
- +  
/
key  
Fig.2  
Except for difference in body colour, the Remote Control  
Unit RM-C364GY and RM-C364 have exactly the same  
Func tions  
10  
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
SETTING OF SYSTEM CONSTANT SET  
Setting item Setting contents  
Setting value  
AV-20NMG3  
AV-20N3  
TRIPLE  
NO  
AV-20N3/D  
AV-20NMG3B AV-20NMG3/-A  
MULTI.  
YES  
TRIPLE  
NO  
PAL  
MULTI.  
COLOUR  
BILINGUAL  
TUNER  
MA  
MU  
MU  
YES  
NO  
E/R  
YES  
AI ECO SENSOR  
LA NG UA GE  
E/R/A/P  
ON  
E/C/M/I  
E/C/M/I  
E/R/A/P  
E/R  
OFF  
20  
ON  
OFF  
B/B SOUND  
YES  
10  
230  
240  
180  
NO  
LOCK  
250  
YES  
MI NT  
YES  
NO  
YES  
COLOUR AUTO  
QSS  
MQ SS  
NO  
MI NT  
NO  
20  
ALC  
10  
20  
YES  
40  
80  
TEXT RATE  
AMP TUNER  
NO  
NO  
YES  
CYL  
YES  
ARA  
POS  
NO  
VNR  
CYL  
NEG  
TEXT TABLE  
VOLUM PW M  
POS  
Table 1  
USER SETTING VALUES  
Setting item  
Setting value  
Setting item  
Setting value  
SUB POWER  
ON  
LANGUAGE  
ENGLISH  
CHANNEL POSITION  
1 POSITION  
CHANNEL PRESET  
AI ECO SENSOR  
VNR  
Refer to OPERATING INSTRUCTION  
VOLUME  
About 10  
OFF  
OFF  
OFF  
TV/VIDEO  
TV  
ON SCREEN DISPLAY  
POSITION INDICATION  
AUTO SHUTOFF  
ON TIMER  
COLOUR SYSTEM  
SOUND SYSTEM  
OFF TIMER  
PAL  
PR1  
OFF  
OFF  
0:00  
B / G  
BLUE BACK  
OFF OSD.Shows 00  
BRIGHT  
CHILD LOCK  
PICTURE MODE (VSM)  
Table 2  
No. 52025  
11  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
INITIAL SETTING VALUE OF SERVICE MENU  
1. Ad justment of the SERVICE MENU is m ade on the basis of the initial setting values ; however, the new setting values which  
set the screen in its optimum condition may differ from the initial setting.  
2. Do not change the initial Setting Values of the Setting (Adjustment) items not listed In “ADJUSTMENT.  
2. V/C  
Initial setting value  
Colour system  
Variable  
range  
Setting item  
PAL  
SE CAM  
NT SC 3.58  
NT SC 4.4 3  
RED  
-128+127  
1. CUT OFF  
2. DRIVE  
GREEN  
BL UE  
RED  
-50  
+ 0  
-128+127  
BL UE  
-127+127  
3. BRIG HT  
4. CONT .  
+ 0  
+ 0  
+ 0  
-63+63  
-63 +63  
5. COLOUR  
+ 0  
+0  
+ 0  
- 2  
TV  
AV-20N3  
AV-20N3  
/D  
-63+63  
6. TINT  
VIDEO  
AV-20NMG 3  
AV-20NMG 3B  
AV-20NMG 3  
+8  
- 2  
/-A  
-31 +31  
+ 0  
7. SECAM BL ADJ.  
8. SHARP Do Not Adj.  
TV  
- 8(Fixed)  
-32 +31  
VIDEO  
+15(Fixed)  
3. DEFLECTION  
Initial setting value  
Setting item  
Variable range  
fv : 50Hz MODE  
fv : 60Hz MODE  
1. VER. POSITION  
2. HOR. POSITION  
3. VER. HEIGHT  
-04 +03  
-16 +15  
-64 +63  
-32 +31  
-32 +31  
-63 +62  
- 2  
- 3  
+ 4  
+ 0  
- 3  
+1  
-40  
+13  
-32  
+ 0  
4. VER. L INE ARITY  
5. VER. SWCURVE  
6. HOR. VCO ADJUST  
+ 0  
+ 0  
Do Not Adj.  
4.VSM PRESET  
VSM pr eset  
mode  
VSM  
BRIGHT  
STANDARD  
SOFT  
Setting item  
TINT SETTING VALUE  
+15  
+15  
+15  
+30  
+15  
COLOUR SETTING VALUE  
BRIG HT SETTING VALUE  
CONT. SETTING VALUE  
SHARP SETTING VALUE  
+15  
+11  
+12  
12  
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
5. PRESET  
The items in the following table, it is no requirement for adjustment.  
If values had changed by the miss operation, set the initial setting values in the following table.  
Colour System Do Not Adjust  
Initial setting value (Fixed value)  
Setting item  
PAL  
SE CAM  
NT SC 3.58  
NT SC 4.43  
1. C TRAP FIX  
1
0
1
0
1
0
1
0
2. SHARP PEAK  
3. ABL  
1
0
1
0
1
0
1
0
4. GAMMA  
TV  
0
2
2
3
5. Y. DELAY TIME  
6. BL ACK EXP START  
7. C-BPF  
VIDEO  
0
2
0
2
3  
3  
3  
3  
TV  
1
1
1
1
0
1
0
1
VIDEO  
8. CW / SCP  
0
0
0
0
9. VIF DET LEVEL  
11. IF AGC MIN  
12. VIF AGC  
0
0
0
0
0
0
0
0
0
0
0
0
13. VIF PMOD  
0
0
0
0
19. VNR  
15  
1
15  
1
15  
1
15  
1
20. RGB LIM  
21. RGB LIMIT LEVEL  
23. TEXT H. POSITION  
24. READ DATA  
2
2
2
2
-3  
-3  
-3  
-3  
Sound System Do Not Adjust  
Setting item  
10. SIF DET LEVEL  
14. SIF BPF BW ADJUST  
15. SIF TRAP FO ADJUST  
16. SIF TRAP FO ADJUST 2  
17. SIF -TRAP  
B/G  
I
D/K  
M
0  
0  
0  
0  
0
0
0
0
0  
0  
0
0  
0  
0
0  
0  
0
0  
0  
0
18. SIF -BPF  
1
0
0
0
22. SIF SW  
0
1
1
1
No. 52025  
13  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
REPLACEMENT OF IC301 (IF V/C DECODER)  
"
For the IC301(IF V/C DECODER) of this model, all data are written in the micro-computer. So, write the data in the micro-  
computer in accordance with the following procedures before starting adjustment.  
PROCEDURES  
(1) Turn the POWER OFF.  
(2) Replace the IC301 with a new one.  
(3) While pressing MENU button and VOL+ button ON the FRONT CABINET s imultaneous ly, turn the POW ER ON. When the POWER is  
turned ON, the data is written in the micro-computer immediately.  
LOCATIONS OF FRONT PANEL BUTTONS AND LAMPS  
1
2
MENU buttons  
CHANNEL /buttons
(MENU /buttons)
- +  
/
VOLUME  
(MENU  
buttons  
3
- +  
/
buttons)  
AI ECO sensor  
4
5
REMOTE CONTROL sensor  
ON TIMER lamp  
6
7
8
POWERlamp  
MAIN POW ER button  
14  
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
SERVICE ADJUSTMENTS  
BEFORE STARTING SERVICE ADJUSTMENT  
1. There ar e 2 way of adjusting this TV: One is with the  
REMOTE CONTROL UNIT and the other is the conventional  
method using adjustment parts and components.  
2. The adjustment with the REMOTE CONTROL UNIT is made  
on the basis of the initial setting values. The setting values  
which adjust the screen to its optimum condition may differ  
from the initial setting values.  
6. Never touch any adjustment parts, which ar e not specified  
in the list for this adjustment VRs, transfor ms, condenser s,  
etc.  
7. Preparation for adjustment  
Unless otherwise specified in the adjustment instructions, preset  
the following functions with the REMOTE CONTROL UNIT.  
User mode position  
3. Make s ure that connection is c orrectly made to AC power  
source.  
PICTURE MODE (VSM)  
VNR  
BRIGHT  
OFF  
4. Turn on the power of the set and equipment before us e, and  
start the adjustment proc edures after waiting at least 30 minutes.  
5. Unless otherwise spec ified, prepare the most suitable rec eption  
or input signal for adjustment.  
TINT / COLOUR / BRIGHT  
CONT. / SHARP  
CENTER  
BLUE BACK  
OFF  
OFF  
OFF  
OFF  
OFF TIMER  
AI ECO SENSOR  
AUTO SHUT OFF  
MEASURING INSTRUMENT AND FIXTURES  
1.DC voltmeter (or digital voltmeter)  
2.Oscilloscope  
3. Signal generator (Pattern generator) [PAL / SECAM / NTSC]  
4.Remote control unit  
ADJUSTMENT ITEMS  
Ad justment item  
B1 POWER SUPPLY  
Ad justment item  
DEFLECTIONcircuit adjustment  
VSM PRESET setting  
FOCUS adjustment  
IF circuit adjustment  
PURITY/ CONVERGENCE adjus tment  
V/C (Video / Chroma) circuit adjustment  
No. 52025  
15  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
BASIC OPERATION OF SERVICE MENU  
"
The adjustment using SERVICE MENU  
The following adjus tment items use the SERVICE MENU in the series of the adjustment. The adjustments are made on the bas is of the  
initial setting values. The adjustment values which adjust the screen to the optimum condition c an be different from the initial setting values.  
With the SERVICE MENU, various s ettings c an be made, and they are broadly classified in the following items of s ettings.  
1.IF ・・・・・・・・・・・・・・・・・・・ Adjustment of the IF circuits.  
2.V/C ・・・・・・・・・・・・・・・・・Adjustment of the VIDEO/CHROMA circuit.  
3.DEF ・・・・・・・・・・・・・・・・・Adjustment of the DEFLECTION circuit.  
4.VSM PRESET ・・・・・・・・・・ Adjustment of the initial setting values of VSM condition as STANDARD, SOFT and BRIGHT.  
(VSM : Video Status Memory)  
・・・・・・・・・・・・・・・  
5.PRESET  
Adjustment of the RF circuit [Do not adjust].  
6. SETUP TOUR OFF ・・・・・・・ It s hould be able to select mode (LANGUAGE and AUTO CH PRESET)..  
[Should be OFF].  
"
Key operation of the SERVICE MENU  
[Enter to SERVICE MENU]  
SERVICE MENU  
Press the DISPLAY key and the PICTURE MODE key of the REMOTE CONTROL  
S
E
R
V
I
C
E M
E
N
U  
UNIT simultaneously. Then enter the SERVICE MENU mode as shown in Fig.1.  
1.IF  
2.V/C  
3.DEF  
5.PRESET  
4.VSM PRESET  
[Exit from SERVICE MENU]  
6.SETUP TOUR OFF  
When complete the adjustment work, press the DISPLAY key to return to the  
SERVICE MENU.  
1-6 SELECT  
***********  
DISP :EXIT  
** ***  
And then press the DISPLAY key again, return to the normal screen.  
.
*** ** **** ***  
[Select from SERVICE MENU]  
Fig.1  
In SERVICE MENU, press the number (16) key of the remote c ontrol unit, to select  
any of the adjustment items.  
The colours which selected item characters are changed.  
KEY ASSIGNMENT OF REMOTE CONTROL UNIT  
PICTURE  
MO DE key  
NUMBERS  
key  
DISPLAY k ey  
MENU  
/key  
MENU  
- +  
/
key  
Except for differenc e in body colour, the Remote Control Unit  
RM-C364GY and RM-C364 have exactly the same Functions.  
16  
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
[Method of setting]  
1. IF  
[1. VCO]  
1 Key ・・・・・・・・・・・・・・・・・・・・・ Select 1.IF.  
1 Key ・・・・・・・・・・・・・・・・・・・・・ Select 1.VCO  
The VCO (CW) screen will be displayed a allow mark when the AFC voltage is at a certain level.  
DISPLAY Key・・・・・・・・・・・・・・・・ As you press this key twice, you will return to the SERVICE MENU.  
[2. DELAY POINT]  
1 Key・・・・・・・・・・・・・・・・・・・・・ Select 1.IF.  
2 Key・・・・・・・・・・・・・・・・・・・・・ Select 2.DELAY POINT.  
MENU -/+ Key ・・・・・・・・・・・・・・・ Set (adjust) the setting values of the setting items.  
DISPLAYKey・・・・・・・・・・・・・・・・ When this is pressed twice, you will return to the SERVICE MENU.  
2.V/C, 3.DEF and 4.VSM PRESET  
2~4Key ・・・・・・・・・・・・・・・・・・・ Select one from 2. V/C, 3. DEF and 4. VSM PRESET.  
MENU /Key ・・・・・・・・・・・・ Select setting items.  
MENU-/+ Key ・・・・・・・・・・・・・・・ Adjust the values of the items.  
DISPLAY Key ・・・・・・・・・・・・・・・・ When this is pressed, return to the SERVICE MENU.  
6.SETUP TOUR  
By pressing the 6 key, you can change the ON or OFF ( should be OFF).  
(Should be OFF)  
%・  
If it is ON, then you turn the TV power off, when you are turn the TV power on again.  
The JVC’s logo will be shown about 15 seconds automatically.  
MENU -/+Key ・・・・・・・・・・・・・・・ Select Language.  
MENU Key・・・・・・・・・・・・・・・ Auto Search.  
No. 52025  
17  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
SERVICE MENU FLOW CHART  
SERVICE MENU  
SUB ME NU 1. I F  
***.**  
VCO(CW)  
TOOHIGH  
MH z  
SERVICE MENU  
IF  
ABOVE REFERENCE  
JUSTREFERENCE  
BELOW REFERENCE  
TOOLOW  
1.IF  
3.DEF  
2.V/C  
4.VSM PRESET  
5.PRESET  
6.SETUP TOUR OFF  
1. VCO  
2. DELAY POINT  
***(**)  
***(**)  
AFT ADJUST  
VCO ADJUST  
FINE  
1-6 SELECT  
****** *****  
DISP :EXIT  
** ***  
1-2 :SELECT  
DISP: EXIT  
.
*** ** ** ** ***  
DISP: EXIT  
OFF  
6.SETUP TOUR  
DELAYPOINT UHF  
SUB ME NU 2. V /C  
OFF  
(Bypressing 6-key)  
ON /  
**  
AGCTAKE-OVER  
V/C  
1. CUTOFF  
PAL  
- / + : OPERATE DISP: EXIT  
* **  
* **  
(R)  
(G)  
(B)* **  
50Hz  
/
:SELECT  
- / + : OPERATE  
DISP :EXIT  
SUB ME NU 3. DEF  
DEF  
PAL  
***  
1. VER. POSITION  
50Hz  
/
:SELECT  
- / + : OPERATE  
DISP :EXIT  
SUB MENU 4. VSM PRESET  
BRIGHT  
**  
TINT  
COLOUR  
BRIGHT  
CONT.  
**  
**  
**  
**  
SHARP  
/
:SELECT  
- / + : OPERATE  
DISP :EXIT  
SUB MENU 5. PRESET  
PRESET  
PAL  
1. C-TRAP FIX  
***  
50Hz  
:SELECT  
- / + : OPERATE  
B/G  
DISP :EXIT  
/
18  
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
ADJUSTMENT LOCATIONS  
(SOLDER SIDE)  
CRT SOCKET PWB  
TOP  
U
TP-47R/G  
TP-47G/R  
TP-47B  
TP-E  
E1  
T
CRT EARTH WIRE  
(BRAIDED ASS'Y)  
MAIN PWB  
FRONT  
F9 01  
IC702  
IC701  
M EM ORY IC  
PW  
DEG  
S
1
S
IC301  
HV  
TU001  
T
U
HVT  
1Pin TP-91(B1)  
2Pin NC  
3Pin X-ray1  
4Pin X-ray2  
UPPER:FOCUS  
LOWER:SCREEN  
5Pin TP-E(  
)
No. 52025  
19  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
ADJUSTMENTS  
B1 POWER SUPPLY  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
Description  
Check of  
B1 Power  
Supply  
Signal  
generator  
TP-91 ( B1)  
1. Input a whole black signal.  
TP-E (#)  
2. Connect a DC voltmeter to TP-91(B1) and TP-E (#).  
3. Make sure that the voltage is DC116. 5±2.0V.  
DC Volt-  
meter  
FOCUS ADJUSTMENT  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
Description  
Ad justment  
of FOCUS  
Signal  
generator  
FOCUS VR  
[In HVT]  
1. Input a cross-hatch signal.  
2. While watching the s creen, adjust the FOCUS VR to make the  
vertical and horizontal lines as fine and sharp as possible.  
3. Make sure that when the screen is darkened, the lines remain in  
good focus.  
IF CIRCUIT ADJUSTMENT  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
1. VCO  
Description  
Ad justment  
of VCO(CW)  
Signal  
generator  
Please use signal generator which is correct proof about the  
sending frequency.  
Remote  
control unit  
1. Input the PAL full colour bar (210.25MHz) signal.  
2. Enter the SERVICE MENU.  
3. Select 1.IF from the SERVICE MENU.  
4. Press 1 key and s elect 1. VCO.  
VCO (CW) ***.** MHz  
5. Select VCO ADJUST with MENU /key.  
6. Press MENU -/+ k ey until the colour of the c haracters TOO  
HIGH changes blue to yellow. Then gradually press the MENU  
-/+ key until the TOO LOW changes yellow. At this time, confirm  
that the value of VCO ADJUST is near +00.  
TOOHIGH  
ABOVE REFERENCE  
JUST REFERENCE  
BELOW REFERENCE  
TOOLOW  
AFT ADJUST  
VCO ADJUST  
FINE  
YELLOW  
***(**)  
***(**)  
7. Select AFT ADJUST with MENU /key.  
8. Press MENU -/+ key until the characters JUST REFERENCE  
changes blue to yellow.  
Do not adjust  
DISP :EXIT  
9. Press the DISPLAY key three times to return to normal screen.  
TOO HIGH  
ABOVEREFERENCE  
J US T R EFE RE NC E  
B ELO W RE FE RE NC E  
TOO LOW  
ADJUSTMENTATTHIS POINTISUSELESS  
ADJUSTMENTPOINT  
20  
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
Description  
Signal  
generator  
Ad justment  
of DELAY  
POINT  
DELAY POINT  
1. Input a blac k and white signal (colour off).  
2. Enter the SERVICE MENU.  
(AGC TAKE-OVER)  
3. Select 1. IF from the SERVICE MENU.  
Remote  
(AGC)  
control unit  
4. Select 2. DELAY POINT by pressing the 2 key on the remote  
control unit.  
5. Set the setting v alues of the setting items as shown bellow  
table.  
6. Then adjust the MENU - or + key until video noise disappears.  
7. Turn to other channels and make sure that there are no  
irregularities.  
DELAY POINT UHF  
AGC TAKE-OVER **  
- / + :OPERATE  
DISP : EXIT  
Setting Item  
Variable range  
Initial setting value  
MATSUSHITA  
(QAU0287-001)  
MURATA  
(QAU0185-004)  
ALPS  
(QAU0282-001)  
NT SC 3.58  
OTHER  
DELAY POINT  
(AGC TAKE OVER)  
45  
35  
45  
45  
45  
35  
0
127  
No. 52025  
21  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
VIDEO / CHROMA CIRCUIT ADJUSTMENT  
The setting (adjustment) usingthe REMOTE CONTROL UNIT is made on the basis of the initial setting values.  
The setting values which adjust the screen to the optimum condition can be different from the initial setting values.  
Do not change the initial setting values of the setting items not listed in “ADJUSTMENT”.  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
Description  
Signal  
generator  
Ad justment  
of WHITE  
1. CUT OFF (R)  
CUT OFF (G)  
CUT OFF (B)  
1. Input a blac k and white signal (colour off).  
2. Enter the SERVICE MENU.  
BALANCE  
(Low light)  
3. Select 2. V/C from the SERVICE MENU, then select 1. CUT OFF  
(R), (G) and (B) .  
Remote  
control unit  
4. Set each value to initial setting value with 49 keys of the  
SCREENVR  
[IN HVT]  
remote control unit.  
5. Press the 1 key of the remote control unit to show the single  
horizontal line on screen.  
6. Turn the SCREENVR fully counter-clockwise, then slowly turn it  
clockwis e to where one of a red, blue or green colour is faintly  
visible.  
V/C  
PAL  
1. C UTOFF  
* **  
(R)  
7. Use keys 49 of the remote control unit and adjust the other 2  
(G) * **  
* **  
(B)  
colours which except the appeared colour to where the single  
horizontal line appears white.  
50Hz  
:SELECT  
/
8. Turn the SCREEN VR to where the single horizontal line glows  
faintly.  
- / + : OPERATE  
DISP: EXIT  
9. Press the 2 key to turn off the single horizontal line.  
10.Press the DISPLAY key twice to return to the normal screen.  
KEY ASSIGNMENT OF REMOTE CONTROL UNIT  
CU TOFF OFF  
(H.LINE OFF)  
1
2
5
3
6
9
CU TOFF ON  
(H.LINE ON)  
G.C UTOFF(  
B. CUTOFF(  
)
)
4
Variable  
range  
Initial setting  
value  
R. CUTOFF(  
R. DRIVE(  
)
)
)
Ad justment item  
B. DRIV E(  
8
7
-128+127  
R
G
B
-50  
-50  
-50  
R. CUTOFF(  
R. DRIVE(  
)
)
B. CUTOFF(  
B. DRIV E(  
)
)
-128+127  
1. CUT OFF  
G.C UTOFF(  
)
-128 +127  
R
G
B
Signal  
generator  
Ad justment  
of WHITE  
2. DRIVE R  
1. Input a blac k and white signal (colour off).  
2. Enter the SERVICE MENU.  
(
)
DRIVE (B)  
BALANCE  
(High light)  
3. Select 2. V/C from the SERVICE MENU.  
Remote  
control unit  
4. Select 2. DRIVE (R) / (B) with MENU /key, and set each  
value to initial s etting value with 4 and 7 or 6 and 9 keys of the  
remote control unit.  
4
7
6
9
5. Use the keys and or and to produc e a white screen  
6. Press the DISPLAY key twice to return to the nomal screen.  
V/C  
PAL  
(R)* **  
2. DRIVE  
* **  
(B)  
Variable  
range  
Initial setting  
value  
Ad justment item  
50Hz  
/
:SELECT  
-128 +127  
R
B
+0  
+0  
2. DRIVE  
- / + : OPERATE  
DISP : EXIT  
-128+127  
22  
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
3. BRIG HT  
Description  
Remote  
control unit  
Ad justment  
of  
1. Receive any broadc ast.  
2. Enter the SERVICE MENU.  
SUB BRIGHT  
3. Select 2. V/C from SERVICE MENU.  
4. Select 3. BRIGHT with the MENU /key.  
5. Set the initial setting value with the MENU - / + key.  
6. If the brightness is not the best with the initial set value, make  
fine adjustment until you get the best brightness.  
Remote  
control unit  
Ad justment  
of  
4. CONT .  
1. Receive any broadc ast.  
2. Enter the SERVICE MENU.  
SUB CONT.  
3. Select 2. V/C from SERVICE MENU.  
4. Select 4. CONT. with the MENU /key.  
5. Set the initial setting value with the MENU - / + key.  
6. If the contrast is not the best with the initial s et value, make fine  
adjustment until you get the best contrast.  
Ad justment  
Remote  
5. COLOUR  
[Method of adjustment without measuring instrument]  
control unit  
of  
SUB  
COLOUR  
PAL COLOUR  
1. Receive a PAL broadc ast.  
2. Enter the SERVICE MENU.  
3. Select 2. V/C from the SERVICE MENU.  
▼ ▲  
/ key.  
4. Select 5. COLOUR with the MENU  
5. Set the initial setting value for PAL COLOUR with the MENU  
- / + key.  
6. If the colour is not the best with the initial set value, make fine  
adjustment until you get the best colour.  
SECAM COLOUR  
1. Receive a SECAM broadc ast.  
2. Make fine adjustment of SECAM COLOUR as previously.  
NTSC 3.58COLOUR  
1. Receive a NTSC 3.58MHz broadcast.  
2. Make similar fine adjustment of NTSC 3. 58 COLOUR as  
previously.  
NTSC 4.43 COLOUR  
When NTSC 3.58 adjustment completed, NTSC 4.43 will be  
automatically set at the respective values.  
No. 52025  
23  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
Description  
Ad justment  
of SUB  
Signal  
generator  
TP-47G/R  
5. COLOUR  
[Method of adjustment using measuring instrument]  
PAL COLOUR  
1. Input a PAL full field colour bar signal (75% white).  
2. Enter the SERVICE MENU.  
COLOUR  
TP-E (#)  
[CRT SOCKET  
PWB]  
Oscillo-  
scope  
3. Select 2. V/C from SERVICE MENU.  
Remote  
control unit  
▼ ▲  
key.  
4. Select 5. COLOUR with the MENU  
/
5. Set the initial setting value of PAL COLOUR with the MENU  
- / + key.  
6. Connect the osc illosc ope between TP-47G and TP-E (#).  
7. Adjust PAL COLOUR to bring the value of (A) in the illustration  
to the voltage as shown given billow.  
B
R
Mg  
(Voltage differenc e between (W) and (G))  
Model  
AV-20N3  
Voltage(W-G)  
+14V  
()  
0V  
/D  
AV-20N3  
W
Y
(A)  
AV-20NMG 3  
AV-20NMG 3B  
AV-20NMG 3/-A  
()  
Cy  
+10V  
G
SECAM COLOUR  
1. Input a SECAM full field colour bar signal (75% white).  
2. Set the initial setting value of SECAM COLOUR with the MENU  
- or + key.  
3. Adjust SECAM COLOUR to bring the value of (A) in the  
illustration to the voltage as shown given billow.  
(Voltage differenc e between (W) and (G))  
Model  
AV-20N3  
Voltage(W-G)  
+8V  
/D  
AV-20N3  
AV-20NMG3  
AV-20NMGB  
+10V  
/-A  
AV-20NMG3  
NTSC 3.58 COLOUR  
1. Input a NTSC 3.58 full field colour bar signal (75% white).  
2. Set the initial setting value of NTSC 3.58 COLOUR with the  
MENU - / + key.  
3. Adjust NTSC 3.58 COLOUR to bring the value of (A) in the  
illustration to the voltage as shown given billow.  
(Voltage differenc e between (W) and (G))  
Model  
AV-20N3  
Voltage(W-G)  
+11V  
/D  
AV-20N3  
AV-20NMG3  
+10V  
AV-20NMG3B  
/-A  
AV-20NMG3  
NTSC 4.43 COLOUR  
When NTSC 3.58 is set, NTSC 4.43 willbe automatically set at the  
respective values .  
24  
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
6. TINT  
Description  
Signal  
generator  
Ad justment  
[Method of adjustment without measuring instrument]  
of TINT  
NTSC 3.58TINT  
Remote  
control unit  
1. Input a NTSC 3.58 full field colour bar signal (75% white).  
2. Enter the SERVICE MENU.  
3. Select 2. V/C from SERVICE MENU.  
4. Select 6. TINT with the MENU /key.  
5. Set the initial setting value of NTSC 3. 58 with the MENU - / +  
key.  
6. If you cannot get the best tint with the initial setting value, make  
fine adjustment until you get the best tint.  
NTSC 4.43 TINT  
When NTSC 3.58 is set, NTSC 4.43 willbe automatically set at the  
respective values .  
Signal  
generator  
Ad justment  
TP-47G/R  
6. TINT  
[Method of adjustment using measuring instrument]  
of TINTⅡ  
TP-E (#)  
[CRT  
SOCKET  
PWB]  
NTSC 3.58TINT  
1. Input a NTSC 3.58 full field colour bar signal (75% white).  
2. Enter the SERVICE MENU.  
Oscillo-  
scope  
3. Select 2. V/C from SERVICE MENU.  
Remote  
control unit  
4. Select 6. TINT with the MENU /key.  
5. Set the initial setting value of NTSC 3. 58 with the MENU - / +  
key.  
6. Connect the osc illosc ope between TP-47G/R and TP-E.  
7. Adjust NTSC 3.58 TINT to bring the value of (B) in the  
illustration to the voltage as shown given billow.  
(Voltage differenc e between (W) and (Cy))  
B
R
Mg  
Model  
AV-20N3  
Voltage(W- Cy)  
+9V  
()  
/D  
AV-20N3  
0V  
W
(B)  
AV-20NMG3  
Y
()  
AV-20NMG3B  
+9V  
Cy  
G
/-A  
AV-20NMG3  
NTSC 4.43 TINT  
When NTSC 3.58 is set, NTSC 4.43 willbe automatically set at the  
respective values .  
No. 52025  
25  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
Description  
Remote  
control unit  
Ad justment  
of SECAM  
BL ACK  
7.SECAM  
[Method of adjustment using measuring instrument]  
BL ADJUST  
1. Input a SECAM full field c olour bar signal.  
2. Enter the SERVICE MENU.  
Signal  
generator  
OFFSET  
3. Select 2. V/C from SERVICE MENU.  
▼ ▲  
/ MENU key.  
4. Select 7. SECAM BL ADJUST with  
5. Set the initial setting value with the – or + MENU key.  
key (c olour OFF) and key (c olour ON) on the  
6. Switch the  
remote control and make sure that there is no colour on the  
blac k and white screen.  
7. If the black and white s creen is not bes t with the initial setting  
value, make fine adjustment until you get the best black and  
white screen.  
8. While watching the screen, adjust the value to be the same  
colour between ON & OFF by ten key on the remote c ontrol  
unit.  
KEY ASSIGNMENT OF REMOTE CONTROL UNIT  
9. Press the DISPLAY key twice to return to the normal screen.  
COLOUR  
ON  
1
4
7
2
5
3
COLOUR  
OFF  
6
9
8
26  
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
DEFLECTION CIRCUIT ADJUSTMENT  
"
There are 2 modes of adjustment (s etting value) ------  
(vertic al frequency 50Hz / 60Hz).  
50Hz mode and  
60Hz mode ----- depending upon the kind of s ignals  
"
When adjusted in mode , mode will be automatically set.  
The setting (adjustment) usingthe REMOTE CONTROL UNIT is made on the basis of the initial setting values.  
The setting values which adjust the screen to the optimum condition can be different from the initial settingvalues.  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
Description  
Ad justment  
of V.HEIGHT  
&
Signal  
generator  
1. VER. POSITION 1. Input a circle pattern signal.  
3. VE R. HE IG HT  
2. Enter the SERVICE MENU.  
3. Select 3. DEF. from SERVICE MENU.  
4. Select 1. VER. POSITION with the MENU  
Remote  
control unit  
▼ ▲  
/ key.  
V.POSITION  
5. Set the initial setting value with the MENU - / + key.  
6. Adjust V and V’ to be equal with the MENU - / + key as s hown in  
Fig.2.  
SUB ME NU 3. DEF  
7. Input a cross -hatch signal.  
DEF  
▼ ▲  
key.  
PAL  
***  
8. Select 3. V. HEIGHT with the MENU  
/
1. VER. POSITION  
9. Set the initial setting value with the MENU - / + key.  
10. As s hown in Fig.1, adjust VE R. HE IGHT and mak e the vertical  
screen size 92% of the picture size with the MENU - / + keys of  
remote control unit.  
50Hz  
/
:SELECT  
- / + : OPERATE  
DISP :EXIT  
Screen size  
Screen  
size  
Picture  
size  
100%  
92%  
Picture size 100%  
Fig.1  
Ad justment  
of HOR.  
Signal  
generator  
2.HOR. POSITION  
11.Input a circle pattern signal.  
▼ ▲  
/ key.  
12.Select 2. HOR POSITION with the MENU  
POSITION  
13. Set the initial setting value of 2. HOR. POSITION with the  
MENU - / + key.  
Remote  
control unit  
14.Adjust 2. HOR. POSITION to make H=H" as shown in Fig. 2  
with the MENU - / + key.  
H
H"  
V
V'  
Fig.2  
No. 52025  
27  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
Measuring  
instrument  
Item  
Test point  
Adjustment part  
Description  
Signal  
generator  
When the vertical linearity has been deteriorated  
Ad justment  
of VER. LIN.  
& VER.  
4. VER. L IN.  
5. VER. SCURVE  
remarkably, perform the following steps.  
Remote  
control unit  
15. Input a cross -hatch signal.  
SCURVE  
▼ ▲  
/ key.  
16.Select 4. VER. LIN. with the MENU  
17.Set the initial setting value of 4. VER LIN. with the MENU - / +  
key.  
TOP  
▼ ▲  
/ key.  
18.Select 5. VER. SCURVE with the MENU  
19.Set the initial setting value of 5. VER. SCURVE wit h the ME NU  
- / + key.  
20.Adjust 4. VER. LIN. and 5. VER. SCURVE so that the spaces  
of each line as shown in Fig. 3 on TOP, CENTER and  
BOTTOM become uniform.  
CENTER  
BOTTOM  
Make sure that the adjustment is properly done on the screen of  
60Hz mode.  
Fig.3  
[NOTE]  
" Adjust to make both 50Hz & 60Hz are the same v. size and  
fine straight line.  
" When adjust again, adjust 50Hz mode first.  
" When adjust in 60Hz mode, only 60Hz mode is adjust.  
VSM PRESET SETTING  
Measuring  
Item  
Test point  
Adjustment part  
Description  
instrument  
Setting of  
VSM  
Remote  
TINT  
1. Enter the SERVICE MENU.  
control unit  
COLOUR  
BRIG HT  
CONT.  
SHARP  
2. Select 4. VSM PRESET from the SERVICE MENU.  
3. Select BRIGHT with the PICTURE MODE key.  
▼ ▲  
PRESET  
4. Adjust the MENU  
/
and MENU - / + key to bring the set  
values of TINT  
SHARP to the values shown in the below  
table.  
5. Respectively s elect the VSM PRESET mode for SOFT and  
STANDARD, and make similar adjustment as in 3 above.  
VSM PRESET  
BRIGHT  
VSM  
Setting Item  
**  
**  
**  
**  
**  
BRIGHT  
STANDARD  
SOFT  
TINT  
COLOUR  
BRIGHT  
CONT.  
TINT  
+15  
+15  
+15  
SHARP  
COLOUR  
/
:SELECT  
BRIGHT  
CONT  
+15  
+11  
- / + : OPERATE  
DISP :EXIT  
+30  
+15  
SHARP  
+12  
28  
No. 52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
PURITY / CONVERGENCE ADJUSTMENT  
PURITY ADJUSTMENT  
1. Demagnetize CRT with the demagnetizer.  
2. Loosen the retainer screw of the deflec tion yoke.  
3. Remove the wedges.  
W EDGE  
DEFLECTION  
YOKE  
P
CRT  
4. Input a green raster signal from the signal generator, and turn  
the screen to green raster.  
4 6  
P / C  
MAGNETS  
5. Move the deflection yoke backward.  
#
P/C MAGNETS  
6. Bring the long lug of the purity magnets on the short lug and  
position them horizontally. (Fig. 2)  
P : PURITY MAGNET  
4 : 4 POLES (convergence magnets)  
6 : 6 POLES (convergence magnets)  
7. Adjust the gap between two lugs so that the GREEN RASTER  
will come into the center of the screen. (Fig.3)  
Fig.1  
8. Move the deflection yoke forward, and fix the pos ition of the  
deflection yoke so that the whole screen will become green.  
9. Ins ert the wedge to the top side of the deflection yoke so that it  
will not move.  
PURITY MAGNETS  
Long lug  
Shortlug  
10. Input a cross hatch signal.  
11. Verify that the screen is horizontal.  
12. Input red and blue raster signals, and make sure that purity is  
properly adjusted.  
Bring the long lug over the short lug  
andposition them horizontally.  
Fig.2  
(FRONT VIEW )  
GREEN RASTER  
CENTER  
Fig.3  
No. 52025  
29  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
STATIC CONVERGENCE ADJUSTMENT  
1. Input a cross hatch signal.  
2. Using 4-pole convergence magnets , overlap the red and blue  
lines in the center of the screen (Fig. 1) and turn them to  
magenta (red/blue).  
(FRONT VIEW )  
3. Using  
6-pole  
convergence  
magnets,  
overlap  
the  
magenta(red/blue) and green lines in the center of the screen  
and turn them to white.  
4. Repeat 2 and 3 above, and make best c onvergence.  
Fig.1  
(FRONT VIEW )  
DYNAMIC CONVERGENCE ADJUSTMENT  
1. Move the deflec tion yok e up and down and overlap the lines in  
the periphery. (Fig. 2)  
RED  
GREEN BLUE  
BLUE  
GREEN  
RED  
RED  
2. Move the deflection yoke left to right and overlap the lines in the  
periphery. (Fig. 3)  
GREEN  
BLUE  
3. Repeat 1 and 2 above, and make best c onvergence.  
BLUE GREEN  
RED  
Fig.2  
After adjustment, fix the wedge at the original position.  
Fasten the retainer screw of the deflection yoke.  
Fix the 6 magnets with glue.  
(FRONT VIEW )  
GREEN  
GREEN  
BLUE  
RED  
RED  
BLUE  
RED  
GREEN  
BLUE  
BLUE  
GREEN  
RED  
Fig.3  
30  
No.52025  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
REPLACEMENT OF CHIP COMPONENT  
!
CAUTIONS  
1. Avoid heating for more than 3 seconds.  
2. Do not rub the electrodes and the resist parts of the pattern.  
3. When removing a c hip part, melt the s older adequately.  
4. Do not reuse a chip part after removing it.  
! SOLDERING IRON  
1. Use a high ins ulation s oldering iron with a thin pointed end of it.  
2. A 30w s oldering iron is rec ommended for easily removing parts.  
! REPLACEMENT STEPS  
2. How to install Chip parts  
1. How to remove Chip parts  
$
$ Resistors, capacitors, etc  
Resistors, capacitors, etc  
(1) Apply solder to the pattern as indicated in the figure.  
(1) As shown in the figure, push the part with tweezers and  
alternately melt the solder at each end.  
(2) Grasp the chip part with tweezers and plac e it on the s older.  
Then heat and melt the solder at both ends of the chip part.  
(2) Shift with tweezers and remove the chip part.  
$ Transistors, diodes, variable r esistor s, etc  
$ Transistors, diodes, variable r esistor s, etc  
(1) Apply solder to the pattern as indicated in the figure.  
(2) Grasp the chip part with tweezers and place it on the solder.  
(1) Apply extra solder to each lead.  
A
(3) First solder lead as indicated in the figure.  
SOLDER  
SOLDER  
A
(2) As shown in the figure, push the part with tweezers and  
alternately melt the solder at each lead. Shift and remove the  
chip part.  
B
C
(4) Then solder leads B and C.  
A
B
C
Note : After removing the part, remove remaining solder from the  
pattern.  
No.52025  
31  
AV-20N3  
AV-20NMG3  
AV-20NMG3B  
32  
No.52025  

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