Page 1
SERVICE MANUAL
COLOUR TELEVISION
YA07720052
AV-28RH4BU,
AV-28RH4SU
RM-C1100 TV
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
STEREO
TABLE OF CONTENTS
No.YA077
2005/2
Page 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 30kV (at zero bean current)
Speaker 5.7cm × 12.6cm, Oval type × 2 / 8.0cm Round type (tweeter) × 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.YA077)
Page 3
21-PIN EURO CONNECTOR (SCART) : 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.YA077)1-3
Page 4
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.YA077)
Page 5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
• It is a remote controlled color 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.)
• Front AV Input (EXT-3) available.
• 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).
• All programs can be named.
• Forward or backward automatic tuning.
2.2 MAIN DIFFERENCE LIST
Part name AV-28RH4BU AV-28RH4SU
CABINET COLOUR BLACK SILVER
• Sleep timer.
• Child Lock.
• Blue Background
• Comb Filter
•CTI
•T-V Link
• 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)
• NTSC Playback.
(No.YA077)1-5
Page 6
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.
SECTION 3
DISASSEMBLY
3.1.10 REMOVING THE WOOFER & TWEETER
• Remove the REAR COVER.
(1) Remove the 4 screws [J], and remove the WOOFER.
(2) Remove the 2 screws [K], and remove the TWEETER.
(3) Remove the opposite side similarly.
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 FEATURE BOX PWB
• Removing the REAR COVER.
(1) Disconnect the connector PL409 and PL410 on the MAIN
PWB.
(2) Raise up the both sides and disconnect the FEATURE
BOX PWB.
3.1.4 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.
3.1.5 REMOVING THE CHASSIS BASE
• Remove the REAR COVER.
(1) Remove the 2 screws [E].
(2) Remove the CHASSIS BASE.
3.1.6 REMOVING THE AV & HEADPHONE JACK PWB
• Remove the REAR COVER.
• Remove the MAIN PWB.
(1) Remove the 2 screws [F].
(2) Remove the FRONT AV & HEADPHONE JACK PWB.
3.1.11 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.
3.1.12 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.
3.1.7 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.
3.1.8 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.
3.1.9 REMOVING THE LED PWB
• Remove the REAR COVER.
• Remove the CHASSIS BASE.
(1) Remove the 2 screws [I], and remove the LED PWB.
1-6 (No.YA077)
Page 7
A
(x10)
CRT SOCKET
PWB
REAR COVER
B
(x4)
PICTURE TUBE
C
(x2)
BACK DOOR
CHASSIS FRAME
CHASSIS BASE
E
(x2)
D
(x4)
FEATURE BOX
PWB
MAIN PWB
J
SPEAKE
(WOOFER)
G
(x3)
H
(x2)
POWER SWITCH
PWB
(x4)
Fig.1
FRONT CONTROL
PWB
I
(x2)
LED PWB
SPEAKE
K
(x2)
(TWEETER)
F
(x2)
AV &
HEADPHONE
PWB
FRONT CABINET
(No.YA077)1-7
Page 8
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
BRIGHTNESS
CONTRAST COUNTRY Other
COLOUR EXT-2 OUTPUT TV
SHARPNESS
COLOUR TEMP
ZOOM
HUE (only NTSC)
SOUND MENU FEATURE MENU
BALANCE Center SLEEP TIMER OFF
BASS Center CHILD LOCK OFF
TREBLE Center
HYPER SOUND OFF
3.2.2 SETTING APS BIT IN SERVICE MENU
(1) Press [INFORMATION] and [MUTING] keys to enter the service menu.
(2) Press [GREEN] key to select the VIDEO.
(3) Press FUNCTION []/[] keys to select the APS items.
(4) Press FUNCTION []/[] keys to change the value to "ON".
(5) Press [INFORMATION] key to store the change value.
(6) Press [MENU] key to exit the service mode.
These adjust are automatically
restored when APS bit in
Service menu is set.
The procedure for setting APS
bit is described bellow.
LANGUAGE ENGLISH
1-8 (No.YA077)
Page 9
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.YA077)1-9
Page 10
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
• SCREEN ADJUSTMENT
• DEFLECTION CIRCUIT ADJUSTMENT
• GEOMETRY MENU ADJUSTMENT
• WHITE BALANCE ADJUSTMENT
FRONT CONTROL PWB
TOP
VOLUME
TOP
VIDEO
HEADPHONE
PLOGRAM
FRONT
LED PWB
TOP
LED
IC
MENU(+)(-) (+)(-)
FUSE
PWB
FRONT
IC752 (MI-COM)
IC750 (MEMORY)
POWER SWITCH
AV-1(SCART)
AV-2(SCART)
FBT
AV &HEADPHONE
1-10 (No.YA077)
PWB
TUNER
TU200
MAIN PWB
FEATURE BOX PWB
UPPER : FOCUS
LOWER : SCREEN
Page 11
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, and the SERVICE MENU 1 screen (Fig.1)
will be displayed.
SERVICE MENU 1
PRODUCTION i >STORE MENU>EXIT
H/V (FULL MODE)
V-SHIFT
V-SIZE
H-SHIFT
H-SIZE
S-COR
LINRT
ANGLE
BOW
TRAPEZ
PARAB
U.COR
L.COR
TILT
TRPZD
NTSCHS
TXTV
HS04_3
JVC52 ****
**.**.****
****
****
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
VIDEO
WdR
WdG
WdB
CuR
CuG
CuB
G2Cu
YDP
AGC
APSW
APS
T_T
T_P
YDS
YDN
EXT3
DVD
C.M
4:3
SERVICE
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
Fig.1
REMOTE CONTROL UNIT key NAME
MUTING key
INFORMATION key
colour key
RED
GREEN
YELLOW
BLUE
(2) While the SERVICE MENU 1 screen is displayed, press
the BLUE key for access to the SERVICE MENU 2 (Fig.2).
SERVICE MENU 2
PRODUCTION i >STORE MENU>EXIT
ADJUSTMENTS
PIP CNTRST
PIP YDelay
PIP Frame
EHTH SA1
EHTV SA1
EHTH SA2
EHTV SA2
EHTV THRS
SVDEL
OSD CONT
OSD BRI
TEXT BRI
TXTCONT
INIT NVM
Prescaler
FM
NICAM
I2S
SCART
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
OPTIONS
0. HPHONE
1. CRT
2. S-VHS
3. f(IF)
4. Turk
5. RF
6. FRONT
7. MLAN
8. VD
9. CTI
: . AVL
SYSTEM
0. PAL B/G
1. PAL D/K
2. PAL I
3. SECAM B/G
4. SECAM D/K
5. SECAM L/L
6. AUST.
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
Fig.2
4.5.2 SELECTION OF ADJUSTMENT ITEMS
(1) Enter the SERVICE MODE.
(2) Press the COLOUR (RED, GREEN, YELLOW or BLUE)
key and select the SERVICE MENU 1 section. (refer to
next page.)
(3) Press the FUNCTION []/[] key to select the adjustment
item.
(4) Press the FUNCTION []/[] key to set the setting value.
(5) Press the [INFORMATION] key to store the setting value.
UP / DOWN
[ ]/[ ] key
LEFT / RIGHT
[ ]/[ ] key
TEXT key
MENU key
4.5.3 HOW TO EXIT SERVICE MODE
(1) Press the [MENU] key.
(No.YA077)1-11
Page 12
4.5.4 COLOUR KEY FUNCTION AND SCREEN DISPLAY
Colour key function in the SERVICE MENU
colour key
RED
GREEN
YELLOW
BLUE
press time
onece
twice
onece
twice
onece
twice
onece
twice
select menu
H/V
---
VIDEO
---
---
---
SERVICE (SERVICE MENU 2)
---
SERVICE MENU 1
PRODUCTION i >STORE MENU>EXIT
RED key
select H/V
H/V (FULL MODE)
V-SHIFT
V-SIZE
H-SHIFT
H-SIZE
S-COR
LINRT
ANGLE
BOW
TRAPEZ
PARAB
U.COR
L.COR
TILT
TRPZD
NTSCHS
TXTV
HS04_3
JVC*******
*******
****
colour key location
BLUE
YELLOW
GREEN
RED
***
****
***
***
***
***
***
***
***
***
***
***
***
***
***
***
VIDEO
WdR
WdG
WdB
CuR
CuG
CuB
G2Cu
YDP
AGC
APSW
APS
T_T
T_P
YDS
YDN
EXT3
DVD
C.M
4:3
SERVICE
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
GREEN key
select VIDEO
GREEN key twice
access FACTRY SETTINGS
BLUE key
select SERVICE
Do Not Adjust
RED key
select ADJUSTMENT
GREEN key
select Prescaler
SERVICE MENU 2
PRODUCTION i >STORE MENU>EXIT
ADJUSTMENTS
PIP CNTRST
PIP YDelay
PIP Frame
EHTH SA1
EHTV SA1
EHTH SA2
EHTV SA2
EHTV THRS
SVDEL
TU TYPE
OSD CONT
OSD BRI
TEXT BRI
TXTCONT
INIT NVM
Prescaler
FM
NICAM
I2S
SCART
***
***
***
***
***
***
***
*
***
***
***
***
***
***
***
***
***
***
***
***
OPTIONS
0. HPHONE
1. CRT
2. S-VHS
3. f(IF)
4. Turk
5. RF
6. FRONT
7. MLAH
8. VD
9. CTI
: . AVL
SYSTEM
0. PAL B/G
1. PAL D/K
2. PAL I
3. SECAM B/G
4. SECAM D/K
5. SECAM L/L
6. AUST.
FACTORY SETTINGS
P.M. FACTORY SET MENU> SERVICE
FATORY SETTINGS
Brightness
Contrast
Colour
Brightness
Contrast
Colour
Brightness
Contrast
Colour
Brightness
Contrast
Colour
WdR
WdG
WdB
WdR
WdG
WdB
USER
USER
USER
BRIGHT
BRIGHT
BRIGHT
STANDARD
STANDARD
STANDARD
SOFT
SOFT
SOFT
WARM
WARM
WARM
COOL
COOL
COOL
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***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
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BLUE key
select OPTIONS
YELLOW key
select SYSTEM
1-12 (No.YA077)
Page 13
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 crosshatch signal.
(2) Adjust FOCUS VR on the FBT as thin as possible.
FOCUS VR
SCREEN VR
FBT
Item
SCREEN
adjustment
Measuring
instrument
Remote
control unit
Test point Adjustment part Description
SCREEN VR
[On the FBT]
(1) Press [MUTING] and [INFORMATION] key at the
sametime. And then press [BLUE] and [TELETEXT]
key respectively.
Enter screen adjustment from the service mode.
(2) Adjust the SCREEN VR until the "G2 ADJUST OK"
sign appears.
(No.YA077)1-13
Page 14
4.6.3 DEFLECTION CIRCUIT ADJUSTMENT
Item
VERTICAL
SHIFT
Measuring
instrument
Signal
generator
Test point Adjustment part Description
adjustment
Remote
control unit
V-SHIFT (1) Receive a circle pattern signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select V-SHIFT.
(5) Adjust V-SHIFT to make A=B.
(6) Check and readjust V-SHIFT item if the adjustment
A
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
B
VERTICAL
SIZE
adjustment
Very close
Screen
Very close
VERTICAL
S-CORRECTION
& LINEARITY
adjustment
Signal
generator
Remote
control unit
size
Signal
generator
Remote
control unit
V-SIZE (1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select V-SIZE.
(5) Adjust V-SIZE until horizontal black lines on both the
upper and lower part of the crosshatch pattern
become very closeted the upper and lower
horizontal sides of picture size and nearly about to
disappear.
Picture
size
100%
(6) Check and readjust V-SIZE item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
S-COR
(1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
LINRT
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select S-COR.
(5) Adjust S-COR 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 cross-hatch pattern.
(6) Check and readjust S-COR item if the adjustment
UPPER
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
CENTER
(8) Select LINRT.
(9) Adjust LINRT until all the size of squares of the
cross-hatch pattern become in equal size from the
top of the screen to its bottom of the whole screen.
LOWER
(10) Check and readjust LINRT item if the adjustment
becomes improper after some other geometric
adjustments (especially after than S-COR
adjustment) are done.
(11) Press the [INFORMATION] key to memorize the set
value.
1-14 (No.YA077)
Page 15
Item
HORIZONTAL
SHIFT
adjustment
Measuring
instrument
Signal
Test point Adjustment part Description
H-SHIFT (1) Receive a circle pattern signal.
generator
Remote
control unit
CD
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select H-SHIFT.
(5) Adjust H-SHIFT to make C=D.
(6) Check and readjust H-SHIFT item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
HORIZONTAL
SIZE
adjustment
ANGLE
adjustment
Very
close
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Screen size
Picture size 100%
H-SIZE (1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select H-SIZE.
Very
close
(5) Adjust H-SIZE 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 H-SIZE item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
ANGLE (1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select ANGLE.
(5) Adjust ANGLE until the vertical lines of the
crossatch pattern become straight.
(6) Check and readjust ANGLE item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
(No.YA077)1-15
Page 16
Item
BOW
adjustment
TRAPEZIUM
adjustment
Measuring
instrument
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Test point Adjustment part Description
BOW (1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select BOW.
(5) Adjust BOW until the vertical lines become straight.
(6) Check and readjust BOW item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
NOTE :
In case where there is a bow-shaped distortion of
images on the screen. (Figure)
TRAPEZ (1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select TRAPEZ.
(5) Adjust TRAPEZ until vertical lines, especially lines at
Parallel
the sides of the picture frame become parallel to the
both sides of picture tubes as close as possible.
(6) Check and readjust TRAPEZ item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
SIDE PIN
adjustment
Signal
generator
Remote
control unit
Parallel
PARAB (1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select PARAB.
(5) Adjust PARAB 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 PARAB item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
1-16 (No.YA077)
Page 17
Item
CORNER
adjustment
Measuring
instrument
Signal
Test point Adjustment part Description
U.COR
generator
L.COR
Remote
control unit
Straight Straight
(1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select U.COR.
(5) Adjust U.COR until vertical lines at the upper corners
of the picture frame become vertical and parallel to
vertical corner sides of picture tube.
(6) Check and readjust U.COR item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Select L.COR.
(8) Adjust L.COR 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 L.COR item if the adjustment
becomes improper after some other geometric
adjustments are done.
(10) Press the [INFORMATION] key to memorize the set
value.
ROTATION
adjustment
NTSC
HORIZONTAL
SIZE
adjustment
Very
close
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Screen size
TILT (1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select TILT.
(5) Adjust TILT to rotate the complete master clockwise
and counter clockwise depending on the CRT.
(6) Check and readjust TRAPEZ item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
NTSCHS (1) Receive a NTSC crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select NTSCHS.
(5) Adjust NTSCHS until vertical lines on both the left
Very
close
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) Press the [INFORMATION] key to memorize the set
value.
Picture size 100%
(No.YA077)1-17
Page 18
Item
TELETEXT
SCREEN
adjustment
4:3 TUBE
adjustment
Measuring
instrument
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Test point Adjustment part Description
TXTV (1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select TXTV.
(5) Adjust TXTV to adjust the proper vertical size of
Teletext screen.
(6) Check and readjust TRAPEZ item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key to memorize the set
value.
HS04_3 (1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [RED] key to enter the H/V adjustment
group.
(4) Select HS04_3.
(5) Adjust HS04_3 to adjust the proper horizontal size of
4:3 tube.
(6) Press the INFORMATION key and memorize the set
value.
1-18 (No.YA077)
Page 19
4.6.4 VIDEO CIRCUIT
Item
WHITE
BALANCE
adjustment
COLOUR
CUTOFF
LEVEL
adjustment
PAL
Y DELAY
adjustment
AGC
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
Volt meter
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Test point Adjustment part Description
WdR
WdG
WdB
CuR
CuG
CuB
YDP (1) Receive a PAL colour bar signal.
AGC (1) Receive a PAL BG signal at 60dBµV RF signal level.
YDS (1) Receive a SECAM colour bar signal.
YDN (1) Receive a NTSC colour bar signal from an external
(1) Receive a black & white signal.
(2) Enter the SERVICE MODE.
(3) Press the [GREEN] key to enter the VIDEO
adjustment group.
(4) Select WdR, WdG and WdB respectively.
Adjust
(5)
(6) Press the [INFORMATION] key to memorize the set
(1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [GREEN] key to enter the VIDEO
(4) Select CuR, CuG and CuB respectively.
(5) Adjust CuR, CuG and CuB respectively, and set the
(6) Press the [INFORMATION] key to memorize the set
(2) Enter the SERVICE MODE.
(3) Press the [GREEN] key to enter the VIDEO
(4) Select YDP.
(5)
(6) Press the [INFORMATION] key to memorize the set
(2) Enter the SERVICE MODE.
(3) Press the [GREEN] key to enter the VIDEO
(4) Select AGC.
(5) Adjust AGC by pressing until voltage at pin 1 of
(6) Press the [INFORMATION] key to memorize the set
(2) Enter the SERVICE MODE.
(3) Press the [GREEN] key to enter the VIDEO
(4) Select YDS.
(5) Adjust YDS by pressing until the colour transients on
(6) Press the [INFORMATION] key to memorize the set
(2) Enter the SERVICE MODE.
(3) Press the [GREEN] key to enter the VIDEO
(4) Select YDN.
(5) Adjust YDN by pressing until the colour transients on
(6)
WdR, WdG
white part turns to pure white without any other colour.
value.
adjustment group.
values of these items as 64 (contrast).
value.
adjustment group.
Adjust
YDP
until the colour transients on the colour bar
pattern becomes as sharper and possible as colours
between transients do not mix with each other.
value.
adjustment group.
TUNER is equal to 3.0V.
value.
adjustment group.
the colour bar pattern becomes as sharper and
possible as colours between transients do not mix
with each other.
value.
source (e.g. FRONT AV : EXT 3).
adjustment group.
the colour bar pattern becomes as sharper and
possible as colours between transients do not mix
with each other.
Press the [
INFORMATION
and
WdB
] key to memorize the set value.
respectively, until the
(No.YA077)1-19
Page 20
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.
1-20 (No.YA077)
Page 21
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.YA077)
Printed in Japan
VPT
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