JVC AV-28KH1BUF User manual

SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED No.52139
2003/9
COLOUR TELEVISION
5213920039AV-28KH1BUF,
AV-28KH1SUF
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

1-2 (No.52139)
SPECIFICATION
Design & specifications are subject to change without notice.
Items Contents
Dimensions ( W ×H ×D ) 76cm ×57cm ×47.3cm
Mass 33kg
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 NICAM / A2 (Germany system)
Teletext System FLOF (Fastext) / TOP (German system)
Tuning System Frequency synthesizer tuning system
Number of CH memory position 100 ch
Receiving
Frequency VHF Low 46.25MHz ~ 168.25MHz
VHF High 175.25MHz ~ 463.25MHz
UHF 471.25MHz ~ 863.25MHz
CATV S01-S04 & S75-S79
Intermediate
Frequency VIF 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')
Colour Sub Carrier Frequency PAL (4.43MHz), SECAM (4.43MHz), NTSC (3.58MHz/4.43MHz)
Power Input AC220V ~ AC240V, 50Hz
Power Consumption 151W(Max), 3W(Standby)
Aerial Input Terminal 75Ωunbalanced, coaxial
Picture Tube Visible size : 66cm (Measured diagonally)
High Voltage 30kV
Speaker Main:5.7cm ×16cm oval type ×2 / Tweeter: 8W,15W ×2
Audio Output 10W + 10W
Input Video 1V(p-p) 75Ω
S-Video Y : 1V(p-p) positive
C : 0.286V(p-p)
Audio (L/R) 500mV(rms) (-4dBs), High impedance (RCA pin jack ×2)
Output Video 1V(p-p) 75Ω
Audio (L/R) 500mV(rms), Low Impedance
Input Terminal Rear Side EXT-1 (Video / Audio / RGB)
EXT-2 (Video / Audio / RGB / S-VHS)
Right Side EXT-3 (Video / Audio)
Output Terminal Rear Side EXT-1 (Video / Audio)Headphone Jack (Stereo mini jack Ø3.5mm ×1)
EXT-2 (Video / Audio)
EXT-3 (Video / Audio)
Right Side Headphone Jack (Stereo mini jack O3.5mm ×1)
Remote Control Unit VE-30021286 (RM-C1512B), (AA/R06 dry battery ×2) : AV-28KH1BUF
VE-30021287 (RM-C1512S), (AA/R06 dry battery ×2) : AV-28KH1SUF

(No.52139)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 B1 POWER SUPPLY check).
(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 1000Ωper 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)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500 10W
0.15 F AC-TYPE
GOOD EARTH GROUND

1-4 (No.52139)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 21-pin Euro connector (SCART) : EXT-1 / EXT-2 / EXT-3
(P-P= Peak to Peak, B-W= Blanking to white peak)
Pin No. Signal Designation Matching Value EXT-1 EXT-2
1 AUDIO R output 500mV(rms) (Nominal), Low impedance Used Used
2 AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2)
3 AUDIO L output 500mV(rms) (Nominal), Low impedance Used Used
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(B-W), 75 ΩUsed Used
8 FUNCTION SW
(SLOW SW) Low : 0V-3V, High : 8V-12V, High impedance Used Used
9 GND (G) --- Used Used
10 SCL / T-V LINK --- Not used Used (SCL / TV-LINK)
11 G input 700mV(B-W), 75 ΩUsed Used
12 SDA3 --- Not used Not used
13 GND (R) --- Used Used
14 GND (YS) --- Used Used
15 R / C input R : 700mV(B-W), 75 Ω
C : 300mV(P-P), 75 ΩUsed (R) Used (C2/R)
16 Ys input
(FAST SW) Low : 0V-0.4V, 75 Ω High : 1V-3V, 75 ΩUsed Used
17 GND (VIDEO output) --- Used Used
18 GND (VIDEO input) --- Used Used
19 VIDEO output 1V(P-P) (Negative sync), 75 ΩUsed Used
20 VIDEO / Y input 1V(P-P) (Negative sync), 75 ΩUsed Used
21 COMMON GND --- Used Used
20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
[Pin assignment]

(No.52139)1-5
2.2 FEATURES
• It is a remote controlled color television.
• 100 programs from VHF, UHF bands or cable channels can be
preset.
• It can tune cable channels.
• Controlling the TV is very easy by its menu driven system.
• It has two Euroconnector sockets for external device (such as
video recorder, video games, audio set, etc.)
• Side AV Input (EXT-3) available.
• Stereo sound systems (German + Nicam) are available.
• Full function Teletext (Fastext, Toptext).
• It is possible to connect headphone.
• Direct channel access.
• APS (Automatic Programming System).
• All programs can be named.
• Forward or backward automatic tuning.
• Sleep timer.
• Child Lock.
• Blue Background
• Comb Filter
•CTI
•T-VLink
• 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.
2.3 MAIN DIFFERENCE LIST
Part Name AV-28KH1BUF AV-28KH1SUF
FRONT CABINET VE-201279210 VE-20111863
BACK COVER VE-20121494 VE-20120043
BACK DOOR VE-20108124 VE-20120043
FUNCTION BUTTON VE-20091798 VE-20096498
POWER BUTTON VE-20111864 VE-20120046
REMOTE CONTROL UNIT VE-30021286 (RM-C1512B) VE-30021287 (RM-C1512S)

1-6 (No.52139)
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDULE
3.1.1 REMOVING THE REAR COVER
(1) Unplug the power cord.
(2) Remove the 8 screws [A] as shown in the Fig. 1.
(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.
• Remove the BACK DOOR.
(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 FEATURE BOX PWB
• Remove the REAR COVER.
• Remove the BACK DOOR.
(1) Disconnect the connector PL423 and PL424 on the MAIN
PWB.
(2) Raise up the both sides and disconnect the FEATURE
BOX PWB.
3.1.5 REMOVING THE SIDE CONTROL PWB
• Remove the REAR COVER.
(1) Remove the 4 screws [E].
(2) Remove the SIDE PWB.
3.1.6 REMOVING THE BASE
• Remove the REAR COVER.
(1) Remove the 2 screws [F].
(2) Remove the BASE.
NOTE:
Work after fixing so that a CRT screen may be placed upside
down or it may not fall.
3.1.7 REMOVING THE POWER SWITCH PWB
• Remove the REAR COVER.
(1) Remove the 2 screws [G], and remove the POWER
SWITCH PWB.
3.1.8 REMOVING THE LED PWB
• Remove the REAR COVER.
• Remove the POWER SWITCH PWB.
(1) Remove the 2 screws [H], and remove the LED PWB.
3.1.9 REMOVING THE SPEAKER and TWEETER
• Remove the REAR COVER.
(1) Remove the 4 screws [I], and remove the SPEAKER.
(2) Remove the other hand SPEAKER in the same steps.
(3) Remove the 2 screws [J], and remove the TWEETER.
(4) Remove the other hand TWEETER in the same steps.
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 PW Board.
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 PW board.
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.

(No.52139)1-7
Fig.1
x4
x2
x4
x4 x4
x2
x2
x2
x2
x8
LED PWB
POWER SWITCH PWB
TWEETER
MAIN PWB
BASE
FEATURE BOX
PWB
REAR COVER
BACK DOOR
CRT SOCKET PWB
SPEAKER
SIDE CONTROL
PWB
B
A
C
D
E
F
H
G
IJ

1-8 (No.52139)
3.2 REPLACEMENT OF CHIP COMPONENT
3.2.1 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.
3.2.2 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.
3.2.3 REPLACEMENT STEPS
1. How to remove 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.
(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.
2. How to install Chip parts
[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 Aas indicated in the figure.
(4) Then solder leads Band C.
SOLDER SOLDER
A
B
C
A
B
C

(No.52139)1-9
3.3 SETTING OF THE LAST MEMORY FOR SHIPMENT
3.3.1 USER SETTING VALUES
3.3.2 SETTING APS BIT IN SERVICE MENU
(1) Enter service menu in TV mode by pressing [INFORMATION] and [MUTING] keys simultaneously. Service Menu will appear.
(2) Select VIDEO by pressing [GREEN] key on the remote control unit.
(3) Select APS items by pressing the [/] keys on the remote control unit.
(4) Change the value to [ON] by pressing [/] keys on the remote control unit.
(5) Store the change by pressing [INFORMATION] key.
(6) Press [MENU] key on the remote control unit to exit service mode.
Setting Item Setting Value Setting Item Setting Value
SOUND MENU FEATURE MENU
BALANCE CENTER SLEEP TIMER OFF
BASS CENTER CHILD LOCK OFF
TREBLE CENTER
HYPER SOUND OFF
PICTURE MENU INSTALL
BRIGHTNESS These adjust are automatically
restored when APS bit in Service
menu is set.
Theprocedurefor setting APS bit
is described bellow.
LANGUAGE ENGLISH
CONTRAST COUNTRY Other
COLOUR EXT-2 OUTPUT TV
SHARPNESS
COLOUR TEMP
ZOOM
HUE (only NTSC)

1-10 (No.52139)
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:
4.2 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
4.4 ADJUSTMENT LOCATIONS
Setting Item Setting value
BRIGHTNESS CENTER
CONTRAST
COLOUR
SHARPNESS
COLOUR TEMP
ZOOM FULL
VIDEO
HEADPHONE
MENU
P/Ch
SIDE CONTROL PWB
TUNER
TU200
FEATURE BOX PWB
IC720 (MEMORY)
IC721 (MI-COM)
PL424
PL423
MAIN PWB
FBT
UPPER : FOCUS
LOWER : SCREEN

(No.52139)1-11
4.5 BASIC OPERATION OF SERVICE MENU
4.5.1 HOW TO ENTER THE SERVICE MENU
(1) Press the [INFORMATION] key and [MUTING] key
simultaneously, and the SERVICE MENU screen (Fig.1)
will be displayed.
Fig.1
(2) While the SERVICE MENU screen is displayed, press the
[BLUE] key for access to the SERVICEMENU 2 (Fig.2).
Fig.2
4.5.2 SELECTION OF ADJUSTMENT ITEMS
(1) Enter the SERVICE MENU
(2) Press the [COLOUR (RED,GREEN,YELLOW or BLUE)] key
and select the service menu section. (refer to next page.)
(3) Press the FUNCTION [5]/[6] key and select the
ADJUSTMENT ITEM.
(4) Press the FUNCTION [3]/[4] key and set the SETTING
VALUE.
(5) Press the [INFORMATION] key to STORE.
4.5.3 HOW TO EXIT SERVICE MODE
(1) Press the [MENU] key.
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
YDP
AGC
APSW
APS
T_T
T_P
YDS
YDN
DVD
C.M
4:3
SERVICE
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SERVICE MENU
PRODUCTION i >STORE MENU>EXIT
ADJUSTMENTS
PIP CNTRST
PIP YDelay
PIP Frame
EHTHP
EHTH TC
EHTH
EHTV
EHTV TC
SVDEL
BCLTHR(mA)
OSD CONT
OSD BRI
TEXT BRI
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. DPL
8. VD
9. BCL
: . CTI
B. AVL
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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.
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SERVICE MENU 2
MUTE key
REMOTE CONTROL UNIT key NAME
colour key
RED
GREEN
YELLOW
BLUE
INFORMATION key
UP / DOWN
[ ] key
MENU key
LEFT / RIGHT
[ ] key

1-12 (No.52139)
4.5.4 COLOUR KEY FUNCTION AND SCREEN SIDPLAY
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
YDP
AGC
APSW
APS
T_T
T_P
YDS
YDN
DVD
C.M
4:3
SERVICE
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PRODUCTION i >STORE MENU>EXIT
ADJUSTMENTS
PIP CNTRST
PIP YDelay
PIP Frame
EHTHP
EHTH TC
EHTH
EHTV
EHTV TC
SVDEL
BCLTHR(mA)
OSD CONT
OSD BRI
TEXT BRI
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. DPL
8. VD
9. BCL
: . CTI
B. AVL
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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.
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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
PANO1
PANO2
USER
USER
USER
BRIGHT
BRIGHT
BRIGHT
STANDARD
STANDARD
STANDARD
SOFT
SOFT
SOFT
WARM
WARM
WARM
COOL
COOL
COOL
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FACTORY SETTINGS
PICTURE MODE SET MENU MENU> SERVICE
PICTURE MODE SETTINGS
V-SHIFT
V-SIZE
H-SHIFT
H-SIZE
S-COR
LINRT
ANGLE
BOW
TRPEZ
PARAB
U.COR
L.COR
VBST
VBSO
HBST
HBSO
PANORAMA
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PICTURE MODE SETTINGS
SERVICE MENU
Colour key function in the SERVICE MENU
SERVICE MENU 2
RED key
select H/V
GREEN key
select VIDEO
GREEN key twice
access FACTRY SETTINGS
YELLOW key twice
access PICTURE MODE SETTINGS
RED key
select ADJUSTMENT
GREEN key
select Prescaler
BLUE key
select SERVICE
BLUE key
select OPTIONS
YELLOW key
select SYSTEM
ZOOM (RED) key
select picture modes
Do Not Adjust
colour key press time
RED
GREEN
YELLOW
BLUE
onece
twice
onece
twice
onece
twice
onece
twice
select menu
H/V
VIDEO
FACTRY SETTINGS
SERVICE (SERVICE MENU 2)
PICTURE MODE SETTINGS
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colour key location
BLUE
YELLOW
GREEN
RED

(No.52139)1-13
4.6 ADJUSTMENT PROCEDURE
4.6.1 FOCUS / SCREEN ADJUSTMENT
4.6.2 AGC ADJUSTMENT
Item Measuring
instrument Test point Adjustment part Description
FOCUS
adjustment Signal generator
Remote
control unit
FOCUS VR
[On the FBT] (1) Receive a cross-hatch signal. (2) Adjust FOCUS VR on the FBT as thin as possible.
SCREEN
adjustment Signal generator
Remote
control unit
1pin (GND)
RGB cathodes
[CRT PWB]
SCREEN VR
[On the FBT] (1) Receive a colour-bar signal. (2) Ground pin of probe will be connected to 1pin (GND)
of the CRT socket.
(3) 1/100 oscilloscope probe to RGB cathodes on CRT
PWB.
(4) Adjust all control functions (brightness, colour and
contrast) to minimum settings.
(5) Adjust the SCREEN VR until acthode voltage
becomes 150V.
Item Measuring
instrument Test point Adjustment part Description
AGC
adjustment Signal generator
Remote
control unit
Volt meter
AGC (1) Receive a PAL BG signal at 60dBmV RF signal
level.
(2) Enter the SERVICE MENU.
(3) Press the [GREEN] key, then enter the VIDEO
adjustment group.
(4) Select AGC.
(5) Adjust AGC by pressing till voltage at pin 1 of
TUNER is equal to 3.0V.
(6) Press the [INFORMATION] key and memorize the
set value.
FBT
FOCUS VR
SCREEN VR
FBT
FOCUS VR
SCREEN VR

1-14 (No.52139)
4.6.3 DEFLECTION CIRCUIT ADJUSTMENT
Item Measuring
instrument Test point Adjustment part Description
VERTICAL
SHIFT
adjustment
Signal
generator
Remote
control unit
V-SHIFT (1) Receive a circle pattern signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then 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
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key and memorize the
set value.
VERTICAL SIZE
adjustment Signal generator
Remote
control unit
V-SIZE (1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then 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 cross-hatch pattern
become very closeted the upper and lower
horizontal sides of picture size and nearly about to
disappear.
(6) Check and readjust V-SIZE item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key and memorize the
set value.
A
B
Screen
size
Very close
Very close
Picture
size
100%

(No.52139)1-15
VERTICAL
S-CORRECTION
& LINEARITY
adjustment
Signal
generator
Remote
control unit
S-COR
LINRT
(1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then enter the H/V adjustment
group.
(4) Select S-COR.
(5) Adjust S-COR till the size of squares on both the
upper and lower part of cross-hatch 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
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key and memorize the
set value.
(8) Select LINRT.
(9) Adjust LINRT till 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.
(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 and memorize the
set value.
HORIZONTAL
SHIFT
adjustment
Signal
generator
Remote
control unit
H-SHIFT (1) Receive a circle pattern signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then 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 and memorize the
set value.
Item Measuring
instrument Test point Adjustment part Description
UPPER
CENTER
LOWER
CD

1-16 (No.52139)
HORIZONTAL
SIZE
adjustment
Signal
generator
Remote
control unit
H-SIZE (1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then enter the H/V adjustment
group.
(4) Select H-SIZE.
(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 and memorize the
set value.
ANGLE
adjustment Signal generator
Remote
control unit
ANGLE (1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then enter the H/V adjustment
group.
(4) Select ANGLE.
(5) Adjust ANGLE till the vertical lines of the cross-hatch
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 and memorize the
set value.
BOW
adjustment Signal generator
Remote
control unit
BOW (1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then enter the H/V adjustment
group.
(4) Select BOW.
(5) Adjust BOW till 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 and memorize the
set value.
NOTE:
In case where there is a bow-shaped distortion of
images on the screen. (Figure)
Item Measuring
instrument Test point Adjustment part Description
Screen size
Very
close
Very
close
Picture size 100%

(No.52139)1-17
TRAPEZIUM
adjustment Signal generator
Remote
control unit
TRAPEZ (1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then enter the H/V adjustment
group.
(4) Select TRAPEZ.
(5) Adjust TRAPEZ till 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 TRAPEZ item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [INFORMATION] key and memorize the
set value.
SIDE PIN
adjustment Signal generator
Remote
control unit
PARAB (1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then enter the H/V adjustment
group.
(4) Select PARAB.
(5) Adjust PARAB till 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 and memorize the
set value.
Item Measuring
instrument Test point Adjustment part Description
Parallel
Parallel

1-18 (No.52139)
CORNER
adjustment Signal generator
Remote
control unit
U.COR
L.COR
(1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then enter the H/V adjustment
group.
(4) Select U.COR.
(5) Adjust U.COR till 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 till 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 and memorize the
set value.
ROTATION
adjustment Signal generator
Remote
control unit
TILT (1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then enter the H/V adjustment
group.
(4) Select TILT.
(5) Adjust TILT to rotate the complete master clock-wise
and counter clock-wise 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 and memorize the
set value.
Item Measuring
instrument Test point Adjustment part Description
Straight Straight

(No.52139)1-19
NTSC
HORIZONTAL
SIZE
adjustment
Signal
generator
Remote
control unit
NTSCHS (1) Receive a NTSC cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then enter the H/V adjustment
group.
(4) Select NTSCHS.
(5) Adjust NTSCHS till 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) Press the [INFORMATION] key and memorize the
set value.
TELETEXT
SCREEN
adjustment
Signal
generator
Remote
control unit
TXTV (1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then 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 and memorize the
set value.
4:3 TUBE
adjustment Signal generator
Remote
control unit
HS04_3 (1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [RED] key, then 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.
Item Measuring
instrument Test point Adjustment part Description
Screen size
Very
close
Very
close
Picture size 100%

1-20 (No.52139)
4.6.4 VIDEO CIRCUIT
Item Measuring
instrument Test point Adjustment part Description
WHITE
BALANCE
adjustment
Signal
generator
Remote
control unit
WdR
WdG
WdB
(1) Receive a black & white signal.
(2) Enter the SERVICE MENU.
(3) Press the [GREEN] key, then enter the VIDEO
adjustment group.
(4) Select WdR, WdG and WdB respectively.
(5) Adjust WdR, WdG and WdB respectively, until the
white part turns to pure white without any other
colour.
(6) Press the [INFORMATION] key and memorize the
set value.
COLOUR
CUTOFF LEVEL
adjustment
Signal
generator
Remote
control unit
CuR
CuG
CuB
(1) Receive a cross-hatch signal.
(2) Enter the SERVICE MENU.
(3) Press the [GREEN] key, then enter the VIDEO
adjustment group.
(4) Select CuR, CuG and CuB respectively.
(5) Adjust CuR, CuG and CUB respectively, and set the
values of these items as 64 (contrast).
(6) Press the [INFORMATION] key and memorize the
set value.
PAL
Y DELAY
adjustment
Signal
generator
Remote
control unit
YDP (1) Receive a PAL colour bar signal.
(2) Enter the SERVICE MENU.
(3) Press the [GREEN] key, then enter the VIDEO
adjustment group.
(4) Select YDP.
(5) Adjust YDP till the colour transients on the colour bar
pattern becomes as sharper and possible as colours
between transients do not mix with each other.
(6) Press the [INFORMATION] key and memorize the
set value.
SECAM
Y DELAY
adjustment
Signal
generator
Remote
control unit
YDS (1) Receive a SECAM colour bar signal.
(2) Enter the SERVICE MENU.
(3) Press the [GREEN] key, then enter the VIDEO
adjustment group.
(4) Select YDS.
(5) Adjust YDS by pressing till the colour transients on
the colour bar pattern becomes as sharper and
possible as colouers between transients do not mix
with each other.
(6) Press the [INFORMATION] key and memorize the
set value.
NTSC
Y DELAY
adjustment
Signal
generator
Remote
control unit
YDN (1) Receive a NTSC colour bar signal from an external
source (e.g. FRONT AV : EXT 4).
(2) Enter the SERVICE MENU.
(3) Press the [GREEN] key, then enter the VIDEO
adjustment group.
(4) Select YDN.
(5) Adjust YDN by pressing till the colour transients on
the colour bar pattern becomes as sharper and
possible as colouers between transients do not mix
with each other.
(6) Press the [INFORMATION] key and memorize the
set value.