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
! FEATURES･･･････････････････････････････････････････････････････････････････ 4
! 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 1500Ω 10W 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 Ω/V,
OR MORE SENSITIVITY)
0.15μF AC-TYPE
PLACE THIS PROBE
ON EACH EXPO SED
MET AL PART
1500 Ω 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 10kΩ 2W 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 (110V～240V) 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
RETURN＋key
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.
Ⅰ
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-Ⅱ
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
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
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 (1～6) 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 1 Key ･････････････････････････ Select 1.IF.
② 1 Key ･････････････････････････ Select 1.VCO
③ The VCO (CW) screen will be displayed a allow mark when the AFC voltage is at a certain level.
④ DISPLAY Key･･････････････････ As you press this key twice, you will return to the SERVICE MENU.
[2. DELAY POINT]
① 1 Key･････････････････････････ Select 1.IF.
② 2 Key･････････････････････････ Select 2.DELAY POINT.
③ MENU -/+ Key ･････････････････ Set (adjust) the setting values of the setting items.
④ DISPLAYKey･･････････････････ When this is pressed twice, you will return to the SERVICE MENU.
2.V/C, 3.DEF and 4.VSM PRESET
① 2~4Key ･･･････････････････････ Select one from 2. V/C, 3. DEF and 4. VSM PRESET.
② MENU ▼/▲ Key ･･････････････ Select setting items.
③ MENU-/+ Key ･････････････････ Adjust the values of the items.
④ DISPLAY Key ･･････････････････ When this is pressed, return to the SERVICE MENU.
6.SETUP TOUR
① 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.
② MENU -/+Key ･････････････････ Select Language.
③ 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 4～9 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 4～9 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
Ⅰ
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.
Ⅱ
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 TINTⅠ
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.
①
②
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
"
①
②
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 ① , mode ② 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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