JVC AV-30W475/S, AV-30W475/Y Service Manual

SERVICE MANUAL

COLOR TELEVISION

YA09520047

AV-30W475 /S,

AV-30W475

/Y

BASIC CHASSIS

GW

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

COPYRIGHT © 2004 Victor Company of Japan, Limited

No.YA095

2004/7

SPECIFICATION

Items Contents

Dimensions (W × H × D) 83.8cm × 59.6cm × 55.4cm (33-1/8" × 23-1/2" × 21-7/8")

Mass 52.2kg (115.1Ibs)

TV RF System CCIR (M)

Color System NTSC

Sound System BTSC (Multi Channel Sound)

Teletext System Closed caption (T1-T4 / CC1-CC4)

TV Receiving Channels
and Frequency

TV / CATV Total Channel 181 Channels

Intermediate Frequency Video IF

Color Sub Carrier 3.58 MHz

Power Input AC120V, 60Hz

Power Consumption 140W

Picture Tube (Visible size) 76cm (30”) Measured diagonally (H: 67.4cm × V: 38.4cm)

High Voltage 31.3kV ±1.3kV [at Zero beam current]

Speaker 6.5cm × 13cm (2-1/2" × 5"), Oval type × 2

Audio Power Output 9W + 9W

Antenna Terminal (VHF / UHF) F-type connector, 75 Ω unbalanced

Video / Audio input
[INPUT-1/2/3]

Audio Output (Fix) 500mV(rms)(-4dBs), low Impedance, (400kHz when modulated 100%), RCA pin jack × 2
Remote Control Unit RM-C1258G (AA/R6/UM-3 battery × 2)

Component Video

VHF low

VHF high

UHF

CATV

Sound IF

[Input-2]

S-video

[Input-1]

Video
Audio

02ch to 06ch : 54MHz to 88MHz
07ch to 13ch : 174MHz to 216MHz
14ch to 69ch : 470MHz to 806MHz
54MHz to 804MHz
Low Band : 02 to 06, A-8 by 02 to 06 & 01
High Band : 07 to 13 by 07 to 13
Mid Band : A to I by 14 to 22
Super Band : J to W by 23 to 36
Hyper Band : W+1 to W+28 by 37 to 64
Ultra Band : W+29 to W+84 by 65 to 125
Sub Mid Band : A8, A4 to A1 by 01, 96 to 99

45.75 MHz

41.25 MHz (4.5MHz)

RCA pin jack × 3
Y : 1V(p-p), negative sync, 75 Ω
Pb/Pr : 0.7V(p-p), 75 Ω
Mini DIN 4-pin × 1
Y : 1V(p-p), negative sync, 75 Ω
C : 0.286V(p-p)(burst signal), 75 Ω
1V(p-p), negative sync, 75 Ω, RCA pin jack × 3
500mV(rms)(-4dBs), high impedance, RCA pin jack × 6

Design & specifications are subject to change without notice.

1-2 (No.YA095)

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) Use isolation transformer when hot chassis.

The chassis and any sub-chassis contained in some products are
connected to one side of the AC power line. An isolation
transformer of adequate capacity should be inserted between the
product and the AC power supply point while performing any
service on some products when the HOT chassis is exposed.

(5) Don't short between the LIVE side ground and ISOLATED (NEU-

TRAL) 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.

(6) 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).

(7) 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.

(8) 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.

(9) 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.

(10) 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 1100V AC
(r.m.s.) for a period of one second.

(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance rat-

ed 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

(11) High voltage hold down circuit check.

GOOD EARTH GROUND

ON EACH EXPOSED
ME TAL PAR T

After repair of the high voltage hold down circuit, this circuit shall
be checked to operate correctly.See item "How to check the high
voltage hold down circuit".

This mark shows a fast
operating fuse, the
letters indicated below
show the rating.

A V

POWER CORD
REPLACEMENT WARNING.

Connecting the white line side of power
cord to "WHT" character side.

PWB

White line side

WHT

PW

(No.YA095)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

SMART CAPTION

Smart caption will appear when you press the MUTING button,
only on channels where the broadcast contains CLOSED
CAPTION information.

SMART SOUND

Decreases high sound levels, giving a regulated sound level.

FLAT SQUARE CRT

It became legible from any position by CRT with few reflection
and reflect lumps on the flat screen.

DIGITAL COMB FILTER

By the 3 line digital comb filter, the refreshed image can be
seen.

VIDEO STATUS

Expression of a favorite screen can be chosen by the VIDEO
STATUS function.

[STANDARD ↔ DYNAMIC ↔ THEATER ↔ GAME]

COMPONENT INPUT

Since the component signal input terminal is equipped, it
reappears direct without deteriorating the signal from DVD.

V-CHIP

Since the V-CHIP is built in, it can choose, view and listen to a
healthy program.

MTS STEREO

The voice multiplex function of the MTS system is built in.
(MTS = Multi channel Television Sound system)

RETURN PLUS

You program a specific channel to return to while scanning
through the channels using the CH+ and CH - keys.

VIDEO INPUT LABEL

This function is used to label video input connections for the
onscreen displays.

WORLD CLOCK

The world clock feature provides time differences for some of
the major cities around the world in real time.

BBE

High definition audio adds natural, clear and extraordinary
sound quality to any program.

A.H.S.

Adds a more spacious surround sound. Music gives basic
effect and Movie for more effect.

2.2 HOW TO IDENTIFY MODELS

How to recognize from the appearance of the model concerned is written below. Please distinguish from several contents currently
printed on the rating label

MODEL NAME

AV-30W475

MODEL NO.

AC 120V 60Hz

TV SCREEN SIZE : DIAGONAL

CHASSIS NO.
MANUFACTURED
SERIAL NO.

W

INCHES

ME

VIDEO EQUIPMENT

4C43

DISTINGUISH NAME

S

Y

2.3 MAIN DIFFERENCE LIST

The difference between S models and Y models are in the PICTURE TUBE.

Item AV-30W475/S AV-30W475/Y

PICTURE TUBE (ITC) W76QEN693X002 CHXJIM00032

1-4 (No.YA095)

2.4 TECHNICAL INFORMATION

2.4.1 MAIN MI-COM (CPU) PIN FUNCTION

Pin

Pin name I/O Function

No.

1 MTS_ADJ I Not used 29 YC_GND - GND

2 AFT1 I AFT voltage for tuner (Tuning frequency control) 30 V1_IN I Not used

3 KEY I Key scan for front control [No signal : H] 31 ABCL I Current for automatic beam (brightness)/contrast limit

4 uP_DVss - GND 32

5 Reset I CPU reset [Reset : L] 33 BLACK_DET - Black level detection filter

6 8MHz_OUT O CPU system clock : 8MHz oscillation 34 SVM_OUT O Y signal for scan velocity modulation

7 8MHz_IN I CPU system clock : 8MHz oscillation 35 APL_FIL - Average picture level filter

8 TEST - GND 36 APC_FIL - Automatic phase control filter

9 uP_DVD D I 5V 37 fsc_OUT O Color sub carrier (3.58MHz) for 3-line digital comb filter [IC5201]

10 AGC_MUTE O AGC muting for tuner (when channel select) [Muting : H] 38 YC_Vcc I 5V (for video process circuit)

11 uP_VVSS - GND 39 R_OUT O R signal for CRT output

12 TV_HGND - GND 40 G_OUT O G signal for CRT output

13 FBP_SCP I Flyback pulse (H. pulse) 41 B_OUT O B signal for CRT output

14 HOUT O H. drive (oscillation) 42 RGB_Vcc I 9V (for RGB process circuit)

15 H_Vcc I 9V (for H. oscillation start) 43 IK_IN I Not used

16 HAFC_1 - H. AFC filter 44 TV_DGND - GND

17 Vsaw - V. saw filter 45 uP_AGND - GND

18 VOUT O V. drive 46 uP_AVdd - 5V

19 EW_OUT O Parabola waveform (for sidepin correection) 47 MAIN_POWER O Power on/off switching control [Powen on : L]

20 X-RAY I X-ray detection (for protection) [Detection : H] 48 PANORAMA I Aspect size control [PANORAMA : L]

21 Ys I Not used 49 SDA0 I/O Data for Inter IC control bus (for various devices)

22 Cb_IN I Cb (external) signal 50 SCL0 O Clock for Inter IC control bus (for various devices)

23 Y_IN I Y (external) signal 51 SDA1 I/O Data for Inter IC control bus (for main memory)

24 Cr_IN I Cr (external) signal 52 A_MUTING O Audio muting [Muting : H]

25 TV_DVcc I 3.3V 53 SCL1 O Clock for Inter IC control bus (for main memory)

26 V3IN/CIN I Chroma signal (for YC separation output) 54 LED O POWER / ON TIMER LED lndication [lighting : L]

27 EHT_IN I Not used 55 REMOCON I Remote control sensor input [No input : H]

28 V2_IN/Y_IN I Y signal (for YC separation output) 56 ASP_ABL I Not used

Pin

Pin name I/O Function

No.

MONITOR_OUT

O Not used

(No.YA095)1-5

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

(1) Disconnect the power plug.
(2) Remove the 10 screws [A].
(3) Withdraw the REAR COVER backward.

3.1.2 REMOVING THE AV TERMINAL BOARD

• Remove the REAR COVER.
(1) Remove the 4 screws [B].
(2) Withdraw the AV TERMINAL BOARD toward you.

3.1.3 REMOVING THE CHASSIS

• Remove the REAR COVER.

• Remove the AV TERMINAL BOARD.
(1) Slightly raise the both sides of CHASSIS by hand.
(2) Remove the 2 claws under the both side of the CHASSIS

from the front cabinet.

(3) Withdraw the CHASSIS backward.

(If necessary, remove the wire clamp, connectors etc.)

3.1.7 CHECKING THE CHASSIS

To check the PW Board from back side.

(1) Pull out the CHASSIS (refer to REMOVING THE CHASSIS).
(2) Erect the CHASSIS vertically with the rear side facing up so

that you can easily check the back side of the PW board.

CAUTION :

• When erecting the CHASSIS, 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.

3.1.8 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.

3.1.4 REMOVING THE SPEAKER

• Remove the REAR COVER.
(1) Remove the 2 screws [C] and remove the SPEAKER.
(2) Follow the same steps when removing the other hand

SPEAKER.

3.1.5 REMOVING THE FRONT CONTROL PWB

• Remove the REAR COVER.
(1) Remove the 2 screws [D].
(2) Withdraw the FRONT CONTROL PWB toward you.

*If necessary, remove the wire clamp, connector etc.

3.1.6 REMOVING THE SIDE CONTROL PWB

• Remove the REAR COVER.
(1) Remove the 1 screw [E] and remove the CONTROL

BASE.

(2) Remove the 2 screws [F] and remove the SIDE CONTROL

PWB.

*If necessary, remove the wire clamp, connector etc.

1-6 (No.YA095)

FRONT CABINET

CRT SOCKET PWB

SPEAKER

C

MAIN PWB

D

FRONT CONTROL
PWB

CLAW

F

REAR COVER

E

SIDE CONTROL
PWB

SPEAKER

C

CLAW

AV SELECTOR
PWB

POWER CORD

AV TERMINAL
BOARD

B

Fig.1

A

(No.YA095)1-7

3.1.9 REMOVING THE CRT

NOTE:

• Replacement of the CRT should be performed by 2 or more

persons.

• After removing the REAR COVER, CHASSIS etc.,
(1) Putting the CRT change table on soft cloth, the CRT

change table should also be covered with such soft cloth
(shown in Fig. 3).

(2) While keeping the surface of CRT down, mount the TV set

on the CRT change table balanced will as shown in Fig. 3.

(3) Remove 4 screws marked by arrows with a box type

screwdriver as shown in Fig. 4.

NOTE:

Since the cabinet will drop when screws have been
removed, be sure to support the cabinet with hands.

(4) After 4 screws have been removed, put the cabinet slowly

on cloth (At this time, be carefully so as not to damage the
front
surface of the cabinet) shown in Fig. 5.

NOTE:

• The CRT should be assembled according to the
opposite sequence of its dismounting steps.

• The CRT change table should preferably be smaller
that the CRT surface, and its height be about 35cm.

CRT CHANGE TABLE

CLOTH

CRT
CHANGE
TABLE

Fig.3

CRT

Fig.4

APPROX.
35cm

BOX
TYPE
SCREW
DRIVER

CRT

CABINET

CRT
CHANGE TABLE

Fig.5

COATING OF SILICON GREASE FOR ELECTRICAL INSULATION ON THE CRT ANODE CAP SECTION.

Subsequent to replacement of the CRT and HV transformer or repair of the anode cap, etc. by dismounting them, be sure to coat
silicon grease for electrical insulation as shown in Fig.6.Wipe around the anode button with clean and dry cloth. (Fig.6)Coat silicon
grease on the section around the anode button. At this time, take care so that any silicon greases dose not sticks to the anode
button. (Fig.7)

Silicon grease product No. KS - 650N

CRT

Anode button

Approx.
20mm (Do not
coat grease on
this section

Silicon grease
should be coated
by 5mm or more
from the outside
diameter of anode
cap.

1-8 (No.YA095)

Silicon grease

coating

Fig.6

Anode button
(No sticking of
silicon grease)

Fig.7

Coating position
of silicon grease

Anode cap

3.2 MEMORY IC REPLACEMENT

• This model uses the memory IC.

• This memory IC stores data for proper operation of the video and drive circuits.

• When replacing, be sure to use an IC containing this (initial value) data.

3.2.1 MEMORY IC REPLACEMENT PROCEDURE

1. Power off

Switch off the power and disconnect the power plug.

2. Replace the memory IC

Be sure to use a memory IC written with the initial setting data.

3. Power on

Connect the power cord to the wall outlet and switch on the
power.

4. Receiving channel setting

Refer to the OPERATING INSTRUCTIONS (USER'S GUIDE)
and set the receive channels (Channels Preset) as described.

5. User settings

Check the user setting items according to the "FACTORY
SETTING ITEM" table.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS (USER'S GUIDE) and set the items as
described.

6. SERVICE MODE setting

Verify what to set in the SERVICE MODE, and set whatever is
necessary(Fig.1) .
Refer to the SERVICE ADJUSTMENT for setting.

3.2.2 SERVICE MODE SETTING ITEMS

SERVICE MENU

SERV ICE MENU

1.

V/C(S)

3.

SOUND(A)

5.

3L Y/C(LYC)

7.

LOW LIGHT

9.

VCO

11.

I2C BUS

SELECT BY
OPERATE BY

2.

DEF(D)

4.

OTHERS(F)

8.

HIGH LIGHT

12.

SYSTEM(SYS)

EXIT BY

Fig.1

Setting items Settings Item No.

1. V/C(S)

(Video setting)

2. DEF(D)

(Deflection setting)

3. SOUND(A)
(Audio setting)

4. OTHERS [Do not adjust]
(Factory setting)

5. 3L Y/C(LYC) [Do not adjust]
(Y/C Separate setting)

7. LOW LIGHT

(White balance setting)

8. HIGH LIGHT
(White balance setting)

9. VCO

(VCO setting)

11. I2C BUS [Do not adjust]

2

C BUS setting)

(I

12.SYSTEM (SYS)

(System constant setting)

Adjust S01~S48

Adjust D01~D33

Adjust A01~A08

Fixed F01~F18

Fixed LYC01~LYC12

Adjust ---

Adjust ---

Adjust ---

Fixed ---

Fixed SYS01~SYS26

EXIT

(No.YA095)1-9

3.2.3 SETTINGS OF FACTORY SHIPMENT

3.2.3.1 BUTTON OPERATION 3.2.3.2 REMOTE CONTROL DIRECT OPERATION

Setting item Setting position

POWER Off

CHANNEL CH-02

VOLUME 10

3.2.3.3 REMOTE CONTROL MENU OPERATION

(1) PICTURE ADJUST

Setting item Setting position

TINT 0

COLOR 0

PICTURE +8

BRIGHT 0

DETAIL +8

COLOR TEMPERATURE HIGH

NOISE MUTING ON

VSM ON

(2) SOUND ADJUST

Setting item Setting position

BASS Center

TREBLE Center

BALANCE Center

MTS STEREO

SMART SOUND OFF

INPUT TV

CHANNEL CH-02

VOLUME 10

MUTING OFF

DISPLAY OFF

SLEEP TIMER OFF

THEATER PRO OFF

VIDEO STATUS DYNAMIC

ASPECT REGULAR

SOUND

(3) CLOCK / TIMERS

SET CLOCK OFF

ON / OFF TIMER OFF

WORLD CLOCK Refer to OPERATING

(4) INITIAL SETUP

LANGUAGE ENG.

CLOSED CAPTION OFF (CC1 / T1)

FRONT PANEL LOCK OFF

AUTO SHUT OFF OFF

XDS ID ON

VIDEO INPUT LEVEL ON

AUTO TUNER SETUP CABLE

CHANNEL SUMMARY Refer to OPERATING

V-CHIP OFF

TILT CORRECTION Center

Setting item Setting position

A.H.S OFF

BBE ON

Setting item Setting position

INSTRUCTIONS

Setting item Setting position

INSTRUCTIONS

1-10 (No.YA095)

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.YA095)1-11

SECTION 4

ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) There are 2 ways of adjusting this TV : One is with the

REMOTE CONTROL UNIT and the other is the
conventional method using adjustment parts and
components.

(2) The adjustment using the REMOTE CONTROL UNIT is

made on the basis of the initial setting values. The
setting values which adjust the screen to the optimum
condition can be different from the initial setting
values.

(3) Make sure that connection is correctly made AC to AC

power source.

(4) Turn on the power of the TV and measuring instruments for

warming up for at least 30 minutes before starting
adjustments.

(5) If the receive or input signal is not specified, use the most

appropriate signal for adjustment.

(6) Never touch the parts (such as variable resistors,

transformers and condensers) not shown in the adjustment
items of this service adjustment.

4.2 PRESET SETTING BEFORE ADJUSTMENTS

Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT.

Item Preset value

VIDEO STATUS STANDARD

TINT / COLOR / PICTURE / BRIGHT / DETAIL 0

COLOR TEMPERATURE LOW

VSM OFF

BASS / TREBLE / BALANCE 0

MTS STEREO

BBE OFF

A.H.S OFF

ASPECT FULL

4.3 MEASURING INSTRUMENT AND FIXTURES

• DC voltmeter (or digital voltmeter)

• Oscilloscope

• Signal generator (Pattern generator) [NTSC]

• TV audio multiplex signal generator

• Remote control unit

4.4 ADJUSTMENT ITEMS

CHECK ITEM

• B1 VOLTAGE check

• HIGH VOLTAGE HOLD DOWN check

TUNER / IF CIRCUIT

• IF VCO adjustment

FOCUS

• FOCUS adjustment

DEFLECTION CIRCUIT

• V. SIZE / V. POSITION adjustment

• H. POSITION / H. SIZE / SIDE PIN adjustment

VIDEO CIRCUIT

• WHITE BALANCE (LOW LIGHT) adjustment

• WHITE BALANCE (HIGH LIGHT) adjustment

• SUB BRIGHT adjustment

• SUB CONTRAST adjustment

MTS CIRCUIT

• MTS INPUT LEVEL adjustment

• MTS SEPARATION adjustment

1-12 (No.YA095)

4.5 ADJUSTMENT LOCATIONS

HVT

V C ENT ER SW

VCO

TOP

SIDE CONTROL PWB

FRONT

INPUT 3

FRONT

FRONT CONTROL PWB

CN6006

B

SPEAKER

CN5006

B

SS

MEMORY IC

IC702

CN007

IC201

CN004

PW

CN7007

POWER CORD

F901

5A

POWER SW

POWER LED

FRONT

MAIN PWB

DEG

DEG COIL

CN001

AV SELECTOR
PWB

T111

VCO

TUNER

TOP

V CENTER SW

S421

DOWN

1 : TP-E
2 : X-RAY2
3 : X-RAY1
4 : NC
5 : TP-91

E1

S1

UP

5

1

( )

CRT SOCKET PWB

TP-E

CN3004 CN3005

HV

CN005

TP-R

( )

DEF. YOKE

CRT EARTH

(BRAIDED ASS'Y)

(SOLDER SIDE)

TP-B

HVT

UPPER : FOCUS

LOWER

: SCREEN

(No.YA095)1-13

4.6 BASIC OPERATION OF SERVICE MODE

MAIN MENU

SERVICE MENU

1.V/C(S) 2.DEF(D)

3.SOUND(A) 4.OTHERS(F)

5.3L Y/C(LYC)

7.LOW LIGHT 8.HIGH LIGHT

9.VCO

11.I2C BUS 12.SYSTEM(SYS)

SELECT BY
OPERATE BY EXIT BY

RF 4 : 3 STD LOW

S01 BRIGHT

RF 4 : 3 STD LOW

D01 V FREQ

EXIT

1.V/C(S)

2.DEF(D)

SUB MENU

7.LOW LIGHT

BRIGHT

8.HIGH LIGHT

9.VCO

TOO HIGH GOOD TOO LOW

SYNC: YES
AFC ON
FINE 0

3.SOUND(A)

A01 IN LEVEL

4.OTHERS(F) [Fixed value]

F01

5.3L Y/C(LYC) [Fixed value]

LYC01

11.I2C BUS [Fixed value]

I2C BUS ON

12.SYSTEM(SYS) [Fixed value]

SYS01 VIDEO IN

1-14 (No.YA095)

4.6.1 TOOL OF SERVICE MODE OPERATION

Operate the SERVICE MODE with the REMOTE CONTROL UNIT.

4.6.2 SERVICE MODE ITEMS

In general, basic setting (adjustments) items or verifications are performed in the SERVICE MODE.

1. V/C (S) This sets the setting values of the VIDEO circuit.

2. DEF (D) This sets the setting values of the DEFLECTION circuit.

3. SOUND (A) This sets the setting values of the AUDIO circuit.

4. OTHERS (F) This sets the setting values of the factory settings. [Do not adjust]

6. 3L Y/C(LYC) This sets the setting values of the 3 line YC separation control circuit. [Do not adjust]

7. LOW LIGHT This sets the setting values of the WHITE BALANCE (LOW LIGHT) control circuit.

8. HIGH LIGHT This sets the setting values of the WHITE BALANCE (HIGH LIGHT) control circuit.

9. VCO This sets the setting values of the VCO control circuit.

2

11. I2C BUS This sets the setting values of the I

C BUS control circuit. [Do not adjust]

12. SYSTEM(SYS) This sets the setting values of the system control circuit. [Do not adjust]

4.6.3 HOW TO ENTER THE SERVICE MODE

(1) Set to 0 minutes using the [SLEEP TIMER] key.
(2) Press the [VIDEO STATUS] key and [DISPLAY] key

SERVICE MODE SELECT KEY

simultaneously, then enter the SERVICE MODE.

NOTE:

Before entering the SERVICE MODE, confirm that the setting
of TV / CATV switch of the REMOTE CONTROL UNIT is at the

TV/CATV
switch

"TV" side and the setting of VCR / DVD switch is at the "VCR"
side. If the switches have not been properly set, you cannot
enter the SERVICE MODE.

DISPLAY

SLEEP
TIMER

VCR/DVD
switch

POWER

NUMBER

4.6.4 HOW TO STORE OF SETTING VALUE

The setting value will be stored automatically when release the
REMOTE CONTROL UNIT keys

4.6.5 HOW TO EXIT THE SERVICE MODE

Press the [EXIT] key to exit the SERVICE MODE.

VIDEO
STATUS

VOL -

MENU

ASPECT

RM-C1258G

CH +

VOL +

EXIT

CH -

(No.YA095)1-15

4.6.6 SERVICE MODE SETTING

A

1. V/C, 2. DEF

• Press [CH+] / [CH-] key
For scrolling up/down the adjustment item.

• Press [VOL+] / [VOL-] key
For scrolling up/down the data values.

NOTE:

The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.

INPUT
SIGNAL

RF FULL STD LOW

SPECT

COLOR
TEMPERATURE

VIDEO
STATUS

7. LOW LIGHT

The setting for the WHITE BALANCE (LOW LIGHT) control
circuit.

NOTE:

The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.

SETTING
ITEM

BRIGHT

SETTING
VALUE

SETTING ITEM

SETTING NO.

SETTING VALUE

(1) INPUT SIGANL

RF : Antenna input
COMP : External (Component) input
EXT : External (S / Composite) input

(2) ASPECT

FULL : FULL screen mode
REGU : REGULAR screen mode
CINE : CINEMA screen mode
PANO : PANORAMA screen mode

(3) VIDEO STATUS

STD : STANDARD
THEA : THEATER

(4) COLOR TEMPERATURE

HIGH : White balance high mode
LOW : White balance low mode

R CUTOFF

G CUTOFF B CUTOFF

SETTING VALUE

8. HIGH LIGHT

The setting for the WHITE BALANCE (HIGH LIGHT) control
circuit.

NOTE:

The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.

SETTING VALUE

B DRIVER DRIVE

9. VCO

The setting for the VCO control circuit.

VCO adjustment status (AFC level)

3. SOUND (A)

1-16 (No.YA095)

• Press [CH+] / [CH-] key
For scrolling up/down the adjustment item.

• Press [VOL+] / [VOL-] key
For scrolling up/down the data values.

NOTE:

The setting value will be stored automatically when release
the REMOTE CONTROL UNIT keys.

A01 IN LEVEL

SETTING ITEM

SETTING NO.

SETTING VALUE

SYNC INPUT

AFC SW

TOO HIGH GOOD TOO LOW

SYNC: YES
AFC OFF
FINE 0

Setting value

4.7 INITIAL SETTING VALUE OF SERVICE MODE

(1) Adjustment of the SERVICE MODE is made on the basis of the initial setting values ; however, the new setting values which set

the screen in its optimum condition may differ from the initial setting.
(2) Do not change the initial setting values of the setting items NOT LISTED IN ADJUSTMENT PROCEDURE.
(3) --- : This mark described in each table shows "Cannot adjust it."

4.7.1 [1.V/C(S)]

Initial setting value

No.

S01 BRIGHT 0 to 127 64 --- --- --- --- --- --- ---

S02 PICTURE 0 to 127 55 --- --- --- --- --- --- ---

S03 COLOR 0 to 127 45 --- --- --- --- --- --- ---

S04 TINT 0 to 127 58 --- --- --- --- --- --- ---

S05 DETAIL 0 to 63 35 --- --- --- --- --- --- ---

S06 BRIGHT+- -32 to +32 --- ±0 ±0 ±0 +3 --- --- ---

S07 PICT+- -32 to +32 --- +3 +3 +3 -7 --- --- ---

S08 COLOR+- -32 to +32 --- ±0 ±0 ±0 -3 --- --- ---

S09 TINT+- -32 to +32 --- ±0 ±0 ±0 -3 --- --- ---

S10 DETAIL+- -32 to +32 --- --- --- --- ±0 --- --- ---

Setting

item

Variable

range

REGULAR

STANDARD THEATER

PANORAMA

CINEMA FULL

RF

REGULAR

PANORAMA

CINEMA FULL

No.

S01 BRIGHT 0 to 127 --- ---

S02 PICTURE 0 to 127 --- ---

S03 COLOR 0 to 127 --- 43

S04 TINT 0 to 127 --- 70

S05 DETAIL 0 to 63 40 40

S06 BRIGHT+- -32 to +32 -2 -2

S07 PICT+- -32 to +32 +2 +2

S08 COLOR+- -32 to +32 ±0 ---

S09 TINT+- -32 to +32 +6 ---

S10 DETAIL+- -32 to +32 --- ---

No.

S11 R CUT OFF 0 to 255 60 --- --- --- --- --- --- ---

S12 G CUT OFF 0 to 255 60 --- --- --- --- --- --- ---

S13 B CUT OFF 0 to 255 60 --- --- --- --- --- --- ---

S14 R DRIVE 0 to 127 64 --- --- --- --- --- --- ---

S15 B DRIVE 0 to 127 64 --- --- --- --- --- --- ---

S16 R CUT +- -128 to +127 --- ±0 ±0 ±0 ±0 --- --- ---

S17 G CUT +- -128 to +127 --- ±0 ±0 ±0 ±0 --- --- ---

S18 B CUT +- -128 to +127 --- ±0 ±0 ±0 ±0 --- --- ---

S19 R DRV +- -128 to +127 --- +5 +13 +7 ±0 --- --- ---

S20 B DRV +- -128 to +127 --- +6 -25 -9 ±0 --- --- ---

Setting

item

Setting

item

Variable

range

Variable

range

EXTERNAL

S / COMPOSITE

(

RF / EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT)

STANDARD THEATER STANDARD THEATER

LOW HIGH LOW HIGH LOW HIGH LOW HIGH

Initial setting value

EXTERNAL

)

(COMPONENT)

Initial setting value

(No.YA095)1-17

Initial setting value

No.

S21NTSC MAT0 to 333112211

S22 BLACK ST 0 to 3 3 --- 2 --- --- --- --- ---

S23 DC REST 0 to 1 1 --- 1 --- --- --- --- ---

S24 DCRSW 0 to 1 0 --- 0 --- --- --- --- ---

Setting

item

Variable

range

RF / EXTERNAL (S / COMPOSITE) EXTERNAL (COMPONENT)

STANDARD THEATER STANDARD THEATER

LOW HIGH LOW HIGH LOW HIGH LOW HIGH

No.

S25 ASSY SHRP 0 to 7 4 4 4

S26 BPF FO 0 to 1 0 0 ---

S27 KILR OFF 0 to 1 0 0 ---

S28 KILR SEN 0 to 1 1 1 ---

No.

S29 RGB MUTE 0 to 1 0

S30 BLUE B 0 to 1 0

S31 VIDEO SW 0 to 3 3

S32 CMP ABCL 0 to 1 0

S33 OSD ABL 0 to 1 0

S34 OSD CONT 0 to 63 7

S35 SUB CONT 0 to 15 5

S36 ABL GAIN 0 to 3 0

S37 ABL PNT 0 to 3 3

S38 Y GAMMA 0 to 3 1

S39 Y MUTE 0 to 1 0

S40 SVM GAIN 0 to 3 3

S41 SVM PH 0 to 3 2

S42 WPL 0 to 1 0

S43 COL GMM 0 to 1 0

S44 V1 GAIN 0 to 7 4

S46 VMOFF DE -128 to +127 +3

S47 APC CLK 0 to 1 1

S48 PIP ADJ 0 to 15 8

Setting

item

Setting

item

Variable

range

Variable

range

RF

Initial setting value

Initial setting value

EXTERNAL (S / COMPOSITE)

EXTERNAL (COMPONENT)

1-18 (No.YA095)

4.7.2 [2. DEF (D)]

No.

D01 V FREQ 0 to 3 0 0 0 0 3 3 3 3

D02 AFC GAIN 0 to 3 0 0 0 0 2 2 2 2

D03 H POSI 0 to 31 27 --- --- --- 27 --- --- ---

D04 H POSI+- -128 to +127 --- -1 0 0 --- -1 0 0

D05 V PHASE 0 to 7 0 --- --- --- 0 --- --- ---

D06 V PH+- -128 to +127 --- 0 0 0 --- 0 0 0

D07 V SIZE 0 to 127 28 --- --- --- 28 --- --- ---

D08 V SIZE+- -128 to +127 --- +13 +7 +2 - +13 +7 +2

D09 V CENTER 0 to 63 32 --- --- --- 32 --- --- ---

D10 V CENT+- -128 to +127 --- 0 0 0 - 0 0 0

D11 V S CORR 0 to 15 6 --- --- --- 6 --- --- ---

D12 V S CO+- -128 to +127 --- 0 0 0 --- 0 0 0

D13 V LIN 0 to 15 11 --- --- --- 11 --- --- ---

D14 V LIN+- -128 to +127 --- 0 0 0 - 0 0 0

D15 H SIZE 0 to 63 21 --- --- --- 21 --- --- ---

D16 H SIZE+- -128 to +127 --- -1 -5 +17 - -1 -5 +17

D17

D18

D19

D20 EWCR T+- -128 to +127 --- -2 -1 -3 --- -2 -1 -3

D21

D22 EWCR B+- -128 to +127 --- 0 +3 -2 --- 0 +3 -2

D23 EW PARA 0 to 63 14 --- --- --- 14 --- --- ---

D24

D25 V EHT 0 to 7 0 --- --- --- 0 --- --- ---

D26 V EHT+- -128 to +127 --- 0 0 0 --- 0 0 0

D27 H EHT 0 to 7 0 --- --- --- 0 --- --- ---

D28 H EHT+- -128 to +127 --- 0 0 0 --- 0 0 0

D29 TRAPEZ 0 to 63 30 --- --- --- 30 --- --- ---

D30 TRAPEZ+- -128 to +127 --- 0 +1 -2 --- 0 +1 -2

D31 V AGC 0 to 1 0 0 0 0 0 0 0 0

D32 BLANK SW 0 to 1 0 0 - 0 0 0 --- 0

D33 VRMP BI 0 to 1 0 0 0 0 0 0 0 0

Setting

item

WVMT TOP

WVMT BTM

EWCR TOP

EWCR BTM

EW PARA+-

Variable

range

FULL CINEMA

0 to 3 0 0 --- --- 0 0 --- ---

0 to 3 0 0 --- --- 0 0 --- ---

0 to 31 19 --- --- --- 19 --- --- ---

0 to 31 15 --- --- --- 15 --- --- ---

-128 to +127 --- +6 +4 1 --- +6 +4 +1

RF EXTERNAL

PANORAMA

Initial setting value

REGULAR

FULL CINEMA

PANORAMA

REGULAR

(No.YA095)1-19

4.7.3 [3. SOUND(A)]

No.

A01 IN LEVEL 0 to 15 9

A02 LOW SEP 0 to 63 41

A03 HI SEP 0 to 63 36

A04 SAPC 0 to 1 0

A05 BBE BASS -128 to +127 -2

A06 BBE TRE -128 to +127 -2

A07 AHS MVE -128 to +127 ±0

A08 AHS MSC -128 to +127 ±0

4.7.4 [4. OTHERS(F)] [Do not adjust : All fixed]

No.

F01 OSD POSI 0 to 255 42

F02 OSD FREQ 0 to 255 90

F03 CCD POSI 0 to 255 50

F04 CCD FREQ 0 to 255 93

F05 CCD CONT 0 to 63 4

F06 PUR WBCK 0 to 1 0

F07 PUR CONT 0 to 63 2

F08 CCD PCHK 0 to 1 1

F09 VMOFF 0 to 1 0

F10 VNR CHK 0 to 255 3

F11 VCSN TM 0 to 255 5

F12 VM DAT A -128 to +127 +8

F13 VM DAT B -128 to +127 -8

F14 VM DAT C -128 to +127 -20

F15 VM DAT D -128 to +127 -32

F16 VM DAT E 0 to 1 1

F17 XDSID TM 0 to 255 15

F18 FM TRAP 0 to 1 0

Setting

item

Setting

item

Variable

range

Variable

range

Initial setting value

Initial setting value

4.7.5 [5. 3L Y/C(LYC)] [Do not adjust : All fixed]

No.

LYC01 MODE 0 to 7 4

LYC02 VENH 0 to 7 1

LYC03 PDSOFF 0 to 1 0

LYC04 CB 0 to 1 0

LYC05 VNLR 0 to 15 2

LYC06 GSEL0 0 to 1 0

LYC07 GSEL1 0 to 1 1

LYC08 COR 0 to 3 0

LYC09 TRAP 0 to 1 1

LYC10 CHTRAP 0 to 1 0

LYC11 CBPF 0 to 1 0

LYC12 ENHOFF 0 to 1 0

4.7.6 [12. SYSTEM(SYS)] [Do not adjust : All fixed]

No.

SYS01 VIDEO IN 0 to 4 3

SYS02 VSM 0 to 1 1

SYS03 CLR TEMP 0 to 1 1

SYS04 THEATER 0 to 1 1

SYS05 THEA PRO 0 to 1 1

SYS06 GAME MD 0 to 1 0

SYS07 AHS 0 to 1 1

SYS08 HYPER SR 0 to 1 0

SYS09 BBE 0 to 1 1

SYS10 S SOUND 0 to 1 1

SYS11 16:9 MD 0 to 3 0

SYS12 S CCD 0 to 1 1

SYS13 ID DISP 0 to 1 1

SYS14 CH LAB 0 to 1 1

SYS15 V LAB 0 to 1 1

SYS16 W CLOCK 0 to 1 1

SYS17 PIM 0 to 1 1

SYS18 PURITY 0 to 1 0

SYS19 VOL MUTE 0 to 1 1

SYS20 VCHIP 0 to 1 1

SYS21 VCHIP CA 0 to 1 1

SYS22 CCD 0 to 1 1

SYS23 HYPSCAN 0 to 1 1

SYS24 JVC LOGO 0 to 1 1

SYS25 ASPECT 0 to 1 1

SYS26

Setting

item

Setting

item

PANORAMA

Variable

range

Variable

range

0 to 1 1

Initial setting value

Initial setting value

1-20 (No.YA095)

4.8 ADJUSTMENT PROCEDURE

4.8.1 CHECK ITEM

Item

Measuring

instrument

Test point Adjustment part Description

B1 VOLTAGE DC voltmeter S1 Connector

1-pin : TP-E
5-pin : TP-91
[MAIN PWB]

HIGH VOLTAGE
HOLD DOWN

Resistor
(22kΩ, 1/4W)

S1 connector
2-pin : X-RAY2
3-pin : X-RAY1
[MAIN PWB]

22k

B1

45

1/4W

3 2 1

CONNECTOR

S1

HEATER

HVT

(1) Receive the black and white signal. (color off)
(2) Connect the DC voltmeter to the TP-E and TP-

91(B1) of S1 connector.

(3) Confirm that the voltage is DC134.5V±2V.

• After repairing the high voltage hold down circuit. This
circuit shall be checked to operate correctly.
(1) Turn the power switch to on.
(2) Refer to the figure, connect the resistor between S1

connector 2-pin and 3-pin.
(3) Make sure that the screen picture disappeares.
(4) Disconnect the power plug.
(5) Remove the resistor.
(6) Again connect the power plug.
(7) Turn the power switch to on.
(8) Make sure that the normal picture is displayed on the

screen.

4.8.2 TUNER / IF CIRCUIT

Item

Measuring

instrument

IF VCO Remote

control unit

TOO HIGH GOOD TOO LOW

SYNC: YES
AFC ON
FINE 0

4.8.3 FOCUS

Item

Measuring

instrument

FOCUS Signal

generator

4

Test point Adjustment part Description

[9.VCO]

• It must not adjust without inputting the RF signal.
(1) Receive any broadcast.

MAIN VCO (T111)
[MAIN PWB]

(2) Select 9.VCO from the SERVICE MODE.
(3) Set "AFC" to "OFF" and "FINE" to "0".
(4) Confirm that the color change from "TOO HIGH" to

AFC STATUS
(Turn to green)

"TOO LOW" by CW transf. and check the "SYNC" is
"YES".

(5) Adjust CW transf. until "GOOD" letters turns green.

And then confirm that the "SYNC" is "YES" again.

Adjustment can be done in this statement.
(6) It return "AFC" to "ON".
(7) Push the [EXIT] key to exit the 9.VCO.

Test point Adjustment part Description

FOCUS VR
[In HVT]

(1) Receive the crosshatch signal.
(2) While watching at the screen, adjust FOCUS VR to

the vertical and horizontal lines will be thinnest and

sharpest center horizontal line.
(3) Make sure that the picture is in focus even when the

screen gets darkened.

(No.YA095)1-21

4.8.4 DEFLECTION CIRCUIT

Item

V. SIZE /
V. POSITION

Measuring

instrument

Signal
generator

Remote
control unit

(A)

FULL REGULAR

Test point Adjustment part Description

[2.DEF (D)]
D05: V PHASE
D07: V SIZE
D08: V SIZE+­D14: V LIN+-

(1) Receive the crosshatch signal.
(2) Set the ASPECT to FULL mode.
(3) Select 2.DEF(D) from the SERVICE MODE.
(4) Select < D05 > (V PHASE) and set the value is 0.
(5) Adjust < D07 > and V. CENTER SW so that the

vertical screen size (A) become setting value as
V. CENTER SW (S421)
[MAIN PWB]

shown in the table given left.

(6) Set the ASPECT to REGULAR mode.
(7) Adjust < D08 > (V SIZE+-) and < D14 > (V LIN+-) so

that the vertical screen size (A) become setting value

as shown in the table given left.

(8) Set the ASPECT to PANORAMA mode.

Picture

size

100%

(9) Repeat the step 7 as above.
(10) Set the ASPECT to CINEMA mode.
(11) Repeat the step 7 as above.

NOTE :

• Bottom is to be located within 85% - 95% range.

• If the vertical upper and bottom corner line is not straight,
adjust the upper and bottom corner pin by < D19 >

PANORAMA

CINEMA

(EWCR TOP) and < D21 > (EWCR BTM).

(A)

H. SIZE /
H. POSITION /
SIDE PIN

(B)

92% 92% 85% 80%

Signal
generator

[2.DEF (D)]
D03: H POSI

D04: H POSI+­Remote
control unit

D15: H SIZE

D16: H SIZE+-

D23: EW PARA

D19: EWCR TOP

D21: EWCR BTM

(B)

Picture size 100%

FULL REGULAR

92% 92% 93% 92%

CINEMA

PANORAMA

• V. SIZE / V. POSITION adjustment should be finished.
(1) Receive the crosshatch signal.
(2) Set the ASPECT to FULL mode.
(3) Select 2.DEF(D) from the SERVICE MODE.
(4) Adjust < D03 > (H POSI) and < D15 > (H SIZE) so

that the horizontal screen size become setting value
as shown in the table given left.

(5) Adjust the vertical line at both side to become linear

line by < D23 > (EW PARA).

(6) Confirm the linearity of vertical line and horizontal

size and If it is necessary, readjust steps 4 to 5.
(7) Set the ASPECT to CINEMA mode.
(8) Adjust < D04 > (H POSI+-) and < D16 > (H SIZE+-)

so that the horizontal screen size become setting

value as shown in the table given left.
(9) Adjust the vertical line at both side to become linear

line by < D23 > (EW PARA).

(10) Set the ASPECT to PANORAMA mode.
(11) Repeat the steps 8 to 9 as above.
(12) Set the ASPECT to REGULAR mode.
(13) Repeat the steps 8 to 9 as above.
(14) Adjust the < D16 > (H SIZE+-) so that the screen size

(C) become setting value as 497mm.

NOTE :

• If it is not straight the vertical upper and bottom

corner line adjustment the upper and bottom corner
pin by < D19 > (EWCR TOP) and < D21 > (EWCR
BTM).

1-22 (No.YA095)

(C)

4.8.5 VIDEO CIRCUIT

Item

WHITE
BALANCE

Measuring

instrument

Signal
generator

(LOW LIGHT)

Remote
control unit

Test point Adjustment part Description

LOW LIGHT adjustment mode

SETTING VALUESETTING ITEM

BRIGHT

R CUTOFF

SINGLE HORIZONTAL LINE

G CUTOFF B CUTOFF

SETTING VALUE

[1.V/C (S)]
S01: BRIGHT
S11: R CUTOFF
S12: G CUTOFF
S13: B CUTOFF

[7.LOW LIGHT]

SCREEN VR
[in HVT]

(1) Receive the black and white signal ( color off ).
(2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Confirm the initial setting value of < S11 > (R

CUTOFF), < S12 > (G CUTOFF), < S13 > (B

CUTOFF) and < S01 > (BRIGHT).
(4) Return to the main menu in SERVICE MODE.
(5) Select the 7.LOW LIGHT from the SERVICE MODE.
(6) Display a single horizontal line by pressing the [1]

key.
(7) Turn the SCREEN VR all the way to the left.
(8) Turn the SCREEN VR gradually to the right from the

left until either one of the red, blue or green colors

appears faintly.
(9) Adjust the two colors which did not appear until the

single horizontal line that is displayed becomes

white using the [4] to [9] keys.

(10) Turn the SCREEN VR until the single horizontal line

is displayed faintly.

(11) Press the [2] key to cancel the single horizontal line

mode.

(12) Return to the main menu in SERVICE MODE.
(13) Select the 1.V/C (S) from the SERVICE MODE.
(14) Adjust the BRIGHT level to become the black

component shines white slightly by < S01 >.

(15) Confirm that whether the color ingredient of R, G, or

B is visible to the black component, which shines

white slightly.

(16) When the color ingredient can be seen, two colors

other than a visible color are adjusted, and it is made

to look white.

(17) Return the value of < S01 > to initial setting value.

S

etting

item

S01: BRIGHT 64

S11: R CUT OFF

S12: G CUT OFF 60

S13: B CUT OFF 60

Initial setting value

60

• The [3] (EXIT) key is the cancel key for the WHITE
BALANCE.

REMOTE CONTROL UNIT

H.LINE ON

R CUTOFF B CUTOFF

R CUTOFF B CUTOFF

H.LINE OFF EXIT

G CUTOFF

G CUTOFF

(No.YA095)1-23

Item

WHITE
BALANCE
(HIGH LIGHT)

Measuring

instrument

Test point Adjustment part Description

Signal
generator

Remote
control unit

HIGH LIGHT adjustment mode

[1.V/C (S)]
S14: R DRIVE
S15: B DRIVE

[8.HIGH LIHGT]

(1) Receive the black and white signal (color off).
(2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Set the initial setting value of < S14 > (R DRIVE) and

< S15 > (B DRIVE).
(4) Return to the main menu in SERVICE MODE.
(5) Select the 8.HIGH LIGHT from the SERVICE

MODE.

Adjust the screen until it becomes white using the [4] ,

(6)

[6], [7] and [9] keys.

• The [3] (EXIT) key is the cancel key for the WHITE
BALANCE.

REMOTE CONTROL UNIT

S

etting

S14: R DRIVE

S15: B DRIVE 64

SUB BRIGHT Remote

control unit

S

etting

S01:

BRIGHT

SUB
CONTRAST

Remote
control unit

S

etting

S02:

PICTURE

SETTING VALUE

item

B DRIVER DRIVE

Initial setting value

64

[1.V/C (S)]
S01: BRIGHT

item Initial setting value

64

[1.V/C (S)]
S02: PICTURE

item Initial setting value

55

EXIT

R DRIVE

R DRIVE

B DRIVE

B DRIVE

(1) Receive any broadcast.
(2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Select < S01 > (BRIGHT).
(4) Set the initial setting value of < S01 >.
(5) If the brightness is not the best with the initial setting

value, make fine adjustment of < S01 > until you get
the optimum brightness.

(1) Receive any broadcast.
(2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Select < S02 > (PICTURE).
(4) Set the initial setting value of < S02 >.
(5) If the contrast is not the best with the initial setting

value, make fine adjustment of < S02 > until you get
the optimum contrast.

1-24 (No.YA095)

4.8.6 MTS CIRCUIT

Item

MTS INPUT
LEVEL

Remote
control unit

Measuring

instrument

Test point Adjustment part Description

[3.SOUND (A)]
A01: IN LEVEL

(1) Receive any broadcast.
(2) Select the 3.SOUND (A) from the SERVICE MODE.
(3) Select < A01 > (IN LEVEL).
(4) Set the intal setting value of < A01 >.

S

etting

item

Initial setting value

MTS
SEPARATION

1 cycle

TV audio
multiplex
signal
generator

Oscilloscope

L-Channel
signal waveform

R OUT
L OUT
[AUDIO OUT]

R-Channel
crosstalk portion

Minimum

[3.SOUND (A)]
A02: LOW SEP.
A03: HI SEP.

A01: IN LEVEL

9

(1) Input a stereo L signal (300Hz) from a TV audio

multiplex signal generator to the antenna terminal.

(2) Connect an oscilloscope to R OUT pin of the AUDIO

OUT, and display one cycle portion of the 300Hz

signal.
(3) Select the 3.SOUND (A) from the SERVICE MODE.
(4) Select < A02 > (LOW SEP.).
(5) Set the initial setting value of < A02 >.
(6) Adjust < A02 > so that the stroke element of the

300Hz signal will become minimum.
(7) Change the connection of the oscilloscope to L OUT

pin of the AUDIO OUT, and enlarge the voltage axis.
(8) Change the signal to 3kHz, and similarly adjust

< A03 > (HI SEP.).

etting

item Initial setting value

S

A02: LOW SEP

A03: HI SEP

41

36

(No.YA095)1-25

SECTION 5

TROUBLESHOOTING

This service manual does not describe TROUBLESHOOTING.

1-26 (No.YA095)

JVC SERVICE & ENGINEERING COMPANY OF AMERICA

DIVISION OF JVC AMERICAS CORP.

www.jvcservice.com(US Only)

JVC CANADA INC.

Head office : 21 Finchdene Square Scarborough, Ontario M1X 1A7 [phone]

(No.YA095)

Printed in Japan

WPC