JVC AV-28RT4BU/A, AV-28RT4BU/B, AV-28RT4BU/C, AV-28RT4SU/A, AV-28RT4SU/B Service Manual
...
SERVICE MANUAL
COLOUR TELEVISION
YA07920052
AV-28RT4BU/A, AV-28RT4BU/B,
AV-28RT4BU
AV-28RT4SU
RM-C1100
TV
STEREO
/C, AV-28RT4SU/A,
/B, AV-28RT4SU/C
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.YA079
2005/2
SPECIFICATION
Item Content
Dimensions ( W × H × D ) 76.5cm × 58.5cm × 48.6cm
Mass 33.8kg
TV RF System B/G, D/K, L/L'
Colour System TV Mode PAL / SECAM
Video Mode PAL / SECAM / NTSC 3.58 / NTSC 4.43
Sound System A2 (B/G, D/K), NICAM (B/G, D/K, L/L')
Teletext System Fastext / TOP / WST
Tuning System Frequency synthesizer tuning system
Receiving Frequency VHF(VL)
VHF(VH)
Intermediate Frequency VIF
Colour Sub Carrier Frequency PAL
SECAM
Power Input AC220V - AC240V, 50Hz
Power Consumption 120W (Max) / 3W (Standby)
Aerial Input Terminal 75Ω unbalanced, coaxial
Picture Tube Size Visible size : 66cm (28”), Measured diagonally (H: 58.3cm × V: 33.0cm)
High Voltage 29kV (at zero bean current)
Speaker 5.7cm × 12.6cm, Oval type × 2
Audio Output 10W + 10W (THD10%)
EXT-1 Input / Output 21-pin Euro connector (SCRAT socket) × 1
EXT-2 Input / Output 21-pin Euro connector (SCRAT socket) × 1
EXT-3 Input Video
Audio (L/R)
Headphone jack Stereo mini jack 3.5mm
Remote Control Unit VE-30017763 (RM-C1100), (AA/R06 dry battery × 2)
Design & specifications are subject to change without notice.
46.25MHz - 168.25MHz
175.25MHz - 463.25MHz
UHF
471.25MHz - 863.25MHz
CATV
S01 - S41 & S75 - S79
38.9MHz (B/G, D/K, L) / 33.9MHz (L')
SIF
33.4MHz (5.5MHz:B/G) / 32.9MHz (6.0MHz:D/K) /
32.4MHz (6.5MHz:L) / 40.4MHz (6.5MHz:L')
4.43MHz
4.40625MHz / 4.43MHz
NTSC
3.58MHz / 4.43MHz
1V(p-p) 75Ω, RCA pin jack × 1
500mV(rms) (-4dBs), High Impedance, RCA pin jack × 2
1-2 (No.YA079)
21-PIN EURO CONNECTOR (SCRAT) : EXT-1 / EXT-2
Pin No. Signal designation Matching value EXT-1 EXT-2
1 AUDIO R output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)
2 AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2)
3 AUDIO L output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)
4 AUDIO GND --- Used Used
5 GND (B) --- Used Used
6 AUDIO L input 500mV(rms) (Nominal), High impedance Used (L1) Used (L2)
7 B input 700mV
8 FUNCTION SW (SLOW SW) Low : 0V-3V
, 75 Ω Used Not used
(B-W)
Used Used
High : 8V-12V, High impedance
9 GND (G) --- Used Used
10 SCL / T-V LINK --- Not used Used
(SCL / T-V LINK)
11 G input 700mV(B-W), 75 Ω Used Not used
12 SDA3 --- Not used Used
13 GND (R) --- Used Used
14 GND (YS) --- Used Not used
15 R / C input R : 700mV
C : 300mV
(B-W)
(P-P)
, 75 Ω
, 75 Ω
16 Ys input (FAST SW) Low : 0V-0.4V, 75 Ω
Used (R) Used (C)
Used Not used
High : 1V-3V, 75 Ω
17 GND (VIDEO output) --- Used Used
18 GND (VIDEO input) --- Used Used
19 VIDEO output 1V
20 VIDEO / Y input 1V
(Negative sync),75 Ω Used (TV OUT) Used (LINE OUT)
(P-P)
(Negative sync), 75 Ω Used Used
(P-P)
21 COMMON GND --- Used Used
(P-P= Peak to Peak, B-W= Blanking to white peak)
[Pin assignment]
20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
(No.YA079)1-3
SECTION 1
PRECAUTION
1.1 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 identical to
those used in the original circuits. Service should be
performed by qualified personnel only.
(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.
(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 which
have these special safety 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 use of a substitute replacement which does
not have the same safety characteristics as the
recommended replacement part shown in the parts list of
Service manual may cause shock, fire, or other hazards.
(4) Don't short between the LIVE side ground and
ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing.
Some model's power circuit is partly different in the GND.
The difference 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 the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.). 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).
(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 severe arcing
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, components in the high voltage circuitry
including the picture tube must be the exact replacements
or alternatives approved by the manufacturer of the
complete product.
(7) Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM.
Discharge the picture tube before attempting meter
connection, by connecting a clip lead to the ground frame
and connecting 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 precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer's replacement components.
(9) Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling 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, screw heads, earphone jack,
control shafts, etc.) to be sure the product is safe to operate
without danger of electrical shock.
a) Dielectric Strength Test
The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand 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
appliance 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 service trade.
b) Leakage Current Check
Plug the AC line cord 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 exposed 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 tropical area, this must not exceed 0.2mA AC
(r.m.s.).
Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not
use a line isolation transformer during this check.). Use
an AC voltmeter having 1000Ω per volt or more
sensitivity in the following manner. Connect a 1500Ω
10W resistor paralleled by a 0.15µF AC-type capacitor
between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part,
particularly any exposed metal part having a return path
to the chassis, and measure the AC voltage across the
resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Any voltage measured must
not exceed 0.75V AC (r.m.s.). This corresponds to
0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)
0.15 F AC-TYPE
PLACE THIS PROBE
1500 10W
GOOD EARTH GROUND
ON EACH EXPOSED
ME TAL PAR T
1-4 (No.YA079)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
• It is a remote controlled colour television.
• Controlling the TV is very easy by its menu driven system.
• It has 2 Euroconnector sockets for external device (such as
video recorder, video games, audio set, etc.)
• Stereo sound systems (A2 / Nicam) are available.
• Full function Teletext (Fastext, Toptext, WST).
• It is possible to connect headphone.
• Direct channel access.
• APS (Automatic Programming System).
2.2 MAIN DIFFERENCE LIST
Items AV-28RT4BU AV-28RT4SU
CABINET COLOUR BLACK SILVER
• All programs can be named.
• Forward or backward automatic tuning.
• Sleep timer. / . Child Lock. / . T-V Link
• Blue Background / . NTSC Playback.
• Automatic sound mute when no transmission.
• 5 minutes after the broadcasting (close down), the TV switches
itself automatically to stand-by mode.
• WSS (Wide Screen Signaling)
Items
MAIN PWB VE-20160397 VE-20160371 VE-20160393
IC500 (MI-COM) VE-30029564 VE-30029565 VE-20173330
IC502 (MEMORY) VE-20120610 VE-20134092 VE-20126318
English, German, French, Italian,
OSD LANGUAGES
Spanish, Dutch, Portuguese,
Turkish
AV-28RT4BU/A
AV-28RT4SU/A
English, German, French,
Swedish, norwegian, Danish,
Finnish, greek
AV-28RT4BU/B
AV-28RT4SU/B
AV-28RT4BU/C
AV-28RT4SU/C
English, German, Czech, Polish,
Hungarian, Bulgarian,
Romanian, Croatian
(No.YA079)1-5
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE
3.1.1 REMOVING THE REAR COVER
(1) Unplug the power cord.
(2) Remove the 10 screws [A].
(3) Remove the 4 screws [B].
(4) Withdraw the REAR COVER toward you.
3.1.2 REMOVING THE BACK DOOR
• Remove the REAR COVER.
(1) Remove the 2 screws [C].
(2) Withdraw the BACK DOOR toward you.
3.1.3 REMOVING THE MAIN PWB
• Remove the REAR COVER.
(1) Remove the 4 screws [D].
(2) Slightly raise the both sides of the MAIN PWB by hand and
withdraw the MAIN PWB backward.
[CAUTION]
If necessary, take off the wire clamp, connectors etc.
Be careful enough when developing a MAIN PWB.
3.1.4 REMOVING THE CHASSIS BASE
• Remove the REAR COVER.
(1) Remove the 2 screws [E].
(2) Remove the CHASSIS BASE.
3.1.10 CHECKING THE PW BOARD
• To check the back side of the PW Board.
(1) Pull out the PW Board. (Refer to REMOVING THE MAIN
PWB).
(2) Erect the PW Board vertically so that you can easily check
the back side of the PWB.
[CAUTION]
• When erecting the PW Board, be careful so that there will be
no contacting with other PW Board.
• Before turning on power, make sure that the wire connector
is properly connected.
• When conducting a check with power supplied, be sure to
confirm that the CRT EARTH WIRE (BRAIDED ASS'Y) is
connected to the CRT SOCKET PWB.
3.1.11 WIRE CLAMPING AND CABLE TYING
(1) Be sure to clamp the wire.
(2) Never remove the cable tie used for tying the wires
together.
Should it be inadvertently removed, be sure to tie the wires
with a new cable tie.
3.1.5 REMOVING THE AV & HEADPHONE PWB
• Remove the REAR COVER.
• Remove the MAIN PWB.
(1) Remove the 2 screws [F].
(2) Remove the AV & HEADPHONE PWB.
3.1.6 REMOVING THE FRONT CONTROL PWB
• Remove the REAR COVER.
• Remove the CHASSIS BASE.
(1) Remove the 3 screws [G], and remove the FRONT
CONTROL PWB.
3.1.7 REMOVING THE POWER SWITCH PWB
• Remove the REAR COVER.
• Remove the CHASSIS BASE.
(1) Remove the 2 screws [H], and remove the POWER
SWITCH PWB.
3.1.8 REMOVING THE LED PWB
• Remove the REAR COVER.
• Remove the CHASSIS BASE.
(1) Remove the 2 screws [I], and remove the LED PWB.
3.1.9 REMOVING THE SPEAKER
• Remove the REAR COVER.
(1) Remove the 4 screws [J], and remove the SPEAKER.
(2) Remove the opposite side similarly.
1-6 (No.YA079)
A
(x10)
CRT SOCKET
PWB
REAR COVER
B
(x4)
C
(x2)
BACK DOOR
CHASSIS FRAME
CHASSIS BASE
E
(x2)
D
(x4)
MAIN PWB
SPEAKER
G
(x3)
H
(x2)
POWER SWITCH
PWB
PICTURE TUBE
J
(x4)
FRONT CONTROL
PWB
F
(x2)
AV &
HEADPHONE
PWB
I
(x2)
LED PWB
FRONT CABINET
Fig.1
(No.YA079)1-7
3.2 SETTING OF THE LAST MEMORY FOR SHIPMENT
3.2.1 USER SETTING VALUES
Setting item Setting value Setting item Setting value
PICTURE MENU INSTALL. MENU
BRIGHTNESS
CONTRAST BAND
COLOUR CHANNEL
SHARPNESS STANDARD
HUE (only NTSC) COLOUR SYSTEM
PICTURE MODE USER DECODER (EXT-2)
COLOUR TEMP NORMAL FINE TUNING
ZOOM AUTO SEARCH
SOUND MENU FEATURE MENU
BALANCE Center SLEEP TIMER OFF
BASS Center CHILD LOCK OFF
TREBLE Center LANGUAGE ENGLISH
HYPER SOUND OFF EXT-2 OUTPUT TV
These adjust are automatically
restored when A.P.S. bit in
Service menu is set.
The procedure for setting APS
bit is described bellow.
PROGRAMME
Refer to instruction book
STORE
BLUE BACKGROUND ON
3.2.2 SETTING A.P.S. (AUTO STORE)
(1) Press [MENU] key on the remote control unit to display the main menu.
(2) Press []/[] keys to select "PROGRAM" item, them []/[] keys to display the "PROGRAM" menu.
(3) Press the [BLUE] key to enter the AUTOSTORE mode.
(4) Press []/[] keys to choose the "COUNTRY", then press []/[] keys the choose country you are nou located.
(5) Press []/[] keys to choose the "CONTINUE", then press [] key to start A.P.S. The following message appears.
NOTE :
To cancel the A.P.S., press the [STANDARD] key.
(6) After A.P.S. is finalized, the PROGRAM menu appears again.
(7) Press [STANDARD] key to exit main menu.
1-8 (No.YA079)
3.3 REPLACEMENT OF CHIP COMPONENT
3.3.1 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 chip part, melt the solder adequately.
(4) Do not reuse a chip part after removing it.
3.3.2 SOLDERING IRON
(1) Use a high insulation soldering iron with a thin pointed end of it.
(2) A 30w soldering iron is recommended for easily removing parts.
3.3.3 REPLACEMENT STEPS
1. How to remove Chip parts
2. How to install Chip parts
[Resistors, capacitors, etc.]
(1) As shown in the figure, push the part with tweezers and
alternately melt the solder at each end.
(2) Shift with the tweezers and remove the chip part.
[Transistors, diodes, variable resistors, etc.]
(1) Apply extra solder to each lead.
SOLDER
SOLDER
[Resistors, capacitors, 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. Then heat and melt the solder at both ends of the
chip part.
[Transistors, diodes, variable resistors, 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.
(3) First solder lead A as indicated in the figure.
(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.
NOTE :
After removing the part, remove remaining solder from the
pattern.
A
B
C
(4) Then solder leads B and C.
A
B
C
(No.YA079)1-9
SECTION 4
ADJUSTMENT
4.1 ADJUSTMENT PREPARATION
(1) You can make the necessary adjustments for this unit with
either the Remote Control Unit or with the adjustment tools
and parts as given below.
(2) Adjustment with the Remote Control Unit is made on the
basis of the initial setting values, however, the new setting
values which set the screen to its optimum condition may
differ from the initial settings.
(3) Make sure that AC power is turned on correctly.
(4) Turn on the power for set and test equipment before use,
and start the adjustment procedures after waiting at least
30 minutes.
(5) Unless otherwise specified, prepare the most suitable
reception or input signal for adjustment.
(6) Never touch any adjustment parts which are not specified
in the list for this adjustment - variable resistors,
transformers, condensers, etc.
(7) Presetting before adjustment.
Unless otherwise specified in the adjustment instructions,
preset the following functions with the remote control unit:
4.4 ADJUSTMENT LOCATIONS
Setting item Setting value
BRIGHTNESS
CONTRAST
COLOUR
Center
SHARPNESS
COLOUR TEMP NORMAL
ZOOM AUTO
4.2 MEASURING EQUIPMENT
(1) DC voltmeter (or digital voltmeter)
(2) Signal generator (Pattern generator)
: [PAL / SECAM / NTSC]
(3) Remote control unit
4.3 ADJUSTMENT ITEM
• FOCUS ADJUSTMENT
• SCREEN ADJUSTMENT
• DEFLECTION CIRCUIT ADJUSTMENT
• VIDEO CIRCUIT ADJUSTMENT
FRONT CONTROL PWB
TOP
VOLUME
TOP
VIDEO
HEADPHONE
PLOGRAM
FRONT
LED PWB
TOP
LED
IC
MENU(+)(-) (+)(-)
IC500 (MI-COM)
FUSE
PWB
FRONT
FRONT
IC502 (MEMORY)
POWER SWITCH
AV-1(SCART)
AV-2(SCART)
FBT
AV &HEADPHONE
1-10 (No.YA079)
PWB
TUNER
TU200
MAIN PWB
UPPER : FOCUS
LOWER : SCREEN
4.5 BASIC OPERATION OF SERVICE MODE
4.5.1 HOW TO ENTER THE SERVICE MODE
(1) Press the [INFORMATION] key and [MUTING] key
simultaneously in the main menu, and the SERVICE
MENU screen (Fig.1) will be displayed.
SERVICE MENU
REMOTE CONTROL UNIT key NAME
SERVICE
ADJUST...
OPTIONS...
Select for adjustment Do not adjust except "002"
*********
*********
Fig.1
(2) While the SERVICE MENU screen is displayed, press the
[]/[] and []/[] key and select the "ADJUST...", then
ADJUST MENU screen (Fig.2) will be displayed.
ADJUST MENU
ADJUST...
000
***
001
***
002
***
003
***
004
***
005
***
006
***
007
***
008
***
009
***
MUTING key
INFORMATION key
MENU key
UP / DOWN
[ ]/[ ] key
LEFT / RIGHT
[ ]/[ ] key
SETTING ITEM No. SETTING VALUE
Fig.2
4.5.2 SELECTION OF ADJUSTMENT ITEMS
(1) Enter the SERVICE MODE.
(2) Press the FUNCTION []/[] key to select the adjustment
item.
(3) Press the FUNCTION []/[] key to set the setting value.
(4) The setting value will be stored auto matically when
release the REMOTE CONTROL UNIT keys.
4.5.3 HOW TO EXIT SERVICE MODE
(1) Press the [MENU] key.
(No.YA079)1-11
4.5.4 SERVICE MENU SCREEN
SERVICE MENU
SERVICE
ADJUST...
OPTIONS...
*********
*********
ADJUST MENU
ADJUST...
000
***
001
***
002
***
003
***
004
***
005
***
006
***
007
***
008
***
009
***
SETTING ITEM No. SETTING VALUE
Do Not Adjust
OPTIONS MENU
OPTIONS..
000
********
**
001
********
**
002
********
**
003
********
**
004
********
**
005
********
**
006
********
**
007
********
**
008
********
**
009
********
**
SETTING ITEM No. SETTING VALUE
NOTE:
Do not adjust the OPTIONS MENU. If you change the setting value, the set will not function correctly.
1-12 (No.YA079)
4.6 ADJUSTMENTS PROCEDURE
4.6.1 FOCUS ADJUSTMENT
Item
FOCUS
adjustment
4.6.2 SCREEN ADJUSTMENT
Measuring
instrument
Signal
generator
Remote
control unit
Test point Adjustment part Description
FOCUS VR
[On the FBT]
(1) Receive a PAL crosshatch signal.
(2) Adjust FOCUS VR on the FBT as thin as possible.
FOCUS VR
SCREEN VR
FBT
Item
SCREEN
adjustment
4.6.3 AGC ADJUSTMENT
Item
AGC
adjustment
Measuring
instrument
Remote
control unit
Measuring
instrument
Signal
generator
Remote
control unit
Volt meter
Test point Adjustment part Description
002
[OPTIONS MENU]
SCREEN VR
[On the FBT]
Test point Adjustment part Description
003 (1) Receive a PAL signal at 60dBµV RF signal level.
(1) Enter the OPTIONS MENU.
(2) Select option No.002 and change bit 6 from 0 to 1
disabling vertical scan. Then horizontal line appears.
(3) Adjust horizontal line as thin as possible via screen
adjust pot.
(4) Press number 0 key to leave service menu.
(2) Enter the SERVICE MENU.
(3) Select ADJUST MENU.
(4) Select 003.
(5) Adjust 003 by pressing until voltage at pin 1 of
TUNER is equal to 3.0V.
(No.YA079)1-13
4.6.4 DEFLECTION CIRCUIT ADJUSTMENT
Item
VERTICAL
POSITION
Measuring
instrument
Signal
generator
Test point Adjustment part Description
adjustment
Remote
control unit
030
110 (FULL mode)
A
B
(1) Receive a PAL circle pattern signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 030.
(5) Adjust 030 to make A=B.
(6) Check and readjust 030 item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Select 110 (FULL mode).
(8) Adjust 110 in the same procedure.
VERTICAL
SIZE
adjustment
Screen
size
VERTICAL
S-CORRECTION
& LINEARITY
adjustment
Signal
generator
Remote
control unit
Very close
Very close
Signal
generator
Remote
control unit
031
111 (FULL mode)
Picture
size
100%
032
033
112 (FULL mode)
113 (FULL mode)
UPPER
CENTER
LOWER
(1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 031.
(5) Adjust 031 until horizontal black lines on both the
upper and lower part of the cross-hatch pattern
become very closeted the upper and lower
horizontal sides of picture size and nearly about to
disappear.
(6) Check and readjust 031 item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Select 111 (FULL mode).
(8) Adjust 111 in the same procedure.
(1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 032.
(5) Adjust 032 until the size of squares on both the
upper and lower part of crosshatch pattern become
equal to the squares laying on the vertical center of
the crosshatch pattern.
(6) Check and readjust 032 item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Select 033.
(8) Adjust 033 until all the size of squares of the
crosshatch pattern become in equal size from the
top of the screen to its bottom of the whole screen.
(9) Check and readjust 033 item if the adjustment
becomes improper after some other geometric
adjustments (especially after than S-COR
adjustment) are done.
(10) Select 112 (FULL mode).
(11) Adjust 112 in the same procedure as 5.
(12) Select 113 (FULL mode).
(13) Adjust 113 in the same procedure as 8.
1-14 (No.YA079)
Item
HORIZONTAL
POSITION
adjustment
Measuring
instrument
Signal
Test point Adjustment part Description
038
generator
118 (FULL mode)
Remote
control unit
CD
(1) Receive a PAL circle pattern signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 038.
(5) Adjust 038 to make C=D.
(6) Check and readjust 038 item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Select 118 (FULL mode).
(8) Adjust 118 in the same procedure.
HORIZONTAL
SIZE
adjustment
ANGLE
adjustment
Very
close
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Screen size
Picture size 100%
039
(1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
119 (FULL mode)
(3) Select ADJUST MENU.
(4) Select 039.
(5) Adjust 039 until vertical lines on both the left and
Very
close
right part of the crosshatch will be visible nor screen
will be so wide.
(6) Check and readjust 039 item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Select 119 (FULL mode).
(8) Adjust 119 in the same procedure.
016 (1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 016.
(5) Adjust 016 until the vertical lines of the crosshatch
pattern become straight.
(6) Check and readjust 016 item if the adjustment
becomes improper after some other geometric
adjustments are done.
(No.YA079)1-15
Item
BOW
adjustment
Measuring
instrument
Signal
generator
Remote
control unit
Test point Adjustment part Description
017 (1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 017.
(5) Adjust 017 until the vertical lines become straight.
(6) Check and readjust 017 item if the adjustment
becomes improper after some other geometric
adjustments are done.
NOTE:
In case where there is a bow-shaped distortion of
images on the screen. (Figure)
TRAPEZIUM
adjustment
SIDE PIN
adjustment
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Parallel
Parallel
034
114 (FULL mode)
035
115 (FULL mode)
(1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 034.
(5) Adjust 034 until vertical lines, especially lines at the
sides of the picture frame become parallel to the
both sides of picture tubes as close as possible.
(6) Check and readjust 034 item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Select 114 (FULL mode).
(8) Adjust 114 in the same procedure.
(1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 035.
(5) Adjust 035 until vertical lines close to the both sides
of the picture frame become parallel to vertical sides
of picture tube without any bending to left or to right
side of the screen.
(6) Check and readjust 035 item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Select 115 (FULL mode).
(8) Adjust 115 in the same procedure.
1-16 (No.YA079)
Item
CORNER
adjustment
ROTATION
adjustment
Measuring
instrument
Test point Adjustment part Description
Signal
generator
Remote
control unit
Straight Straight
Signal
generator
Remote
control unit
036
(1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
037
(3) Select ADJUST MENU.
(4) Select 036.
116 (FULL mode)
(5) Adjust 036 until vertical lines at the upper corners of
the picture frame become vertical and parallel to
117 (FULL mode)
vertical corner sides of picture tube.
(6) Check and readjust 036 item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Select 037.
(8) Adjust 037 until vertical lines at the lower corners of
the picture frame become vertical and parallel to
vertical corner sides of picture tube.
(9) Check and readjust 037 item if the adjustment
becomes improper after some other geometric
adjustments are done.
(10) Select 116 (FULL mode).
(11) Adjust 116 in the same procedure as 5.
(12) Select 113 (FULL mode).
(13) Adjust 113 in the same procedure as 8.
083 (1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 083.
(5) Adjust 083 to rotate the complete master clockwise
and counter clockwise depending on the CRT.
(6) Check and readjust 083 item if the adjustment
becomes improper after some other geometric
adjustments are done.
NTSC
HORIZONTAL
SIZE
adjustment
Very
close
Signal
generator
Remote
control unit
Screen size
Picture size 100%
135
142 (FULL mode)
Very
close
(1) Receive a NTSC crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 135.
(5) Adjust 135 until vertical lines on both the left and
right part of the cross-hatch will be visible nor screen
will be so wide.
(6) Check and readjust TRAPEZ item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Select 142 (FULL mode).
(8) Adjust 142 in the same procedure.
(No.YA079)1-17
Item
NTSC
SIDE PIN
adjustment
Measuring
instrument
Signal
generator
Remote
control unit
Test point Adjustment part Description
136 (1) Receive a NTSC crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 136.
(5) Adjust 136 until vertical lines close to the both sides
of the picture frame become parallel to vertical sides
Parallel
of picture tube without any bending to left or to right
side of the screen.
(6) Check and readjust 136 item if the adjustment
becomes improper after some other geometric
adjustments are done.
TELETEXT
SCREEN SIZE
adjustment
Signal
generator
Remote
control unit
143 (1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 143.
(5) Adjust 143 to adjust the proper vertical size of
Teletext screen.
(6) Check and readjust 143 item if the adjustment be-
comes improper after some other geometric adjustments are done.
1-18 (No.YA079)
4.6.5 VIDEO CIRCUIT
Item
WHITE
BALANCE
adjustment
COLOUR
CUTOFF
LEVEL
adjustment
PAL
Y DELAY
adjustment
SECAM
Y DELAY
adjustment
NTSC
Y DELAY
adjustment
Measuring
instrument
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Test point Adjustment part Description
023
024
025
026
027
028
006 (1) Receive a PAL colour bar signal.
007 (1) Receive a SECAM colour bar signal.
008 (1) Receive a NTSC colour bar signal from an external
(1) Receive a PAL black & white signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 023, 024 and 025 respectively.
(5) Adjust 023, 024 and 025 respectively, until the white
part turns to pure white without any other colour.
(1) Receive a PAL crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 026, 027 and 028 respectively.
(5) Adjust 026, 027 and 028 respectively, until the black
part turns to pure black without any other colour.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 006.
(5) Adjust 006 until the colour transients on the colour
bar pattern becomes as sharper and possible as
colours between transients do not mix with each
other.
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 007.
(5) Adjust 007 by pressing until the colour transients on
the colour bar pattern becomes as sharper and
possible as colours between transients do not mix
with each other.
source (e.g. FRONT AV : EXT-3).
(2) Enter the SERVICE MODE.
(3) Select ADJUST MENU.
(4) Select 008.
(5) Adjust 008 by pressing until the colour transients on
the colour bar pattern becomes as sharper and
possible as colours between transients do not mix
with each other.
(No.YA079)1-19
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.
1-20 (No.YA079)
Victor Company of Japan, Limited
AV & MULTIMEDIA COMPANY VIDEO DISPLAY CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan
(No.YA079)
Printed in Japan
VPT
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