JVC AV-20FA44/SA, AV-N21A44/SA Service Manual

SERVICE MANUAL

COLOR TELEVISION

5216620039

AV-20FA44/SA,

AV-N21A44

/SA

BASIC CHASSIS

FJ

POWER

TV

DVD

CATVVCR

INPUT

DISPLAY

1

3

2

SLEEP TIMER

4

6

5

SOUND

7

9

8

RETURN+

100+

VIDEO STATUS

0

THEATER PRO

LIGHT

ASPECT

MUTING

C.C.

CH +

VOL

VOL

+

Ð

CH Ð

EXIT

MENU

VCR/DVD

VCR CHANNEL

TV/VCR

POWER

PREV NEXT

PLAY FFREW

REC

STOP PAUSE

OPEN/CLOSE

STILL/PAUSE

------------------

TV

TABLE OF CONTENTS

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

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

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

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

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED

No.52166

2003/9

SPECIFICATION

Items Contents

Dimensions ( W × H × D ) 66.7cm × 47.7cm × 50.5cm (26-1/4" × 18-13/16" × 19-7/8")
Mass 25kg (55lbs)
TV RF System CCIR(M)
Color System NTSC
Sound System BTSC (Multi Channel Sound)
TV Receiving Channels

and Frequency

TV / CATV Total Channel 180 Channels
Intermediate Frequency Video IF

Color Sub Carrier 3.58 MHz
Power Input AC120V , 60Hz
Power Consumption 75W
Picture Tube 20" (51cm) Measured diagonally, full square (H:40.6cm × V:30.5cm)
High Voltage 26.0kV ±1.3kV (at zero beam current)
Speaker 6.5cm × 13cm (2-1/2" × 5"), Oval type × 2
Audio Output 3W + 3W
Antenna Terminal (VHF/UHF) F-type connector, 75Ω unbalanced, coaxial
Video / Audio Input (1/2/3) Video

Component video

Audio Output (Fix) 0.5V(rms)(-4dBs), low impedance (400Hz when modulated 100%)

Headphone Jack 3.5mm mini jack × 1
Remote Control Unit RM-C1251G (AA/R06 dry battery × 2)

Design & specifications are subject to change without notice.

VHF Low

VHF High

UHF

CATV

Sound IF

Audio

S-Video

[INPUT-1]

[INPUT-2]

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

45.75 MHz

41.25 MHz (4.5MHz)

1V(p-p), 75Ω (RCA pin jack × 3)

0.5V(rms) (-4dBs), high impedance (RCA pin jack × 6)
Mini-DIN 4pin× 1
Y : 1V(p-p) positive (negative sync), 75Ω
C : 0.286V(p-p) (burst signal), 75Ω
RCA pin jack × 3
Y : 1V(p-p) positive (negative sync), 75Ω
PB/PR : 0.7V(p-p), 75Ω

(RCA pin jack × 2)

1-2 (No.52166)

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 cir cuitry of the pr oducts shou ld n ot 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 me chanical 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 w hich 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 part s 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

(NEUTRAL) side ground or EARTH side ground whe n 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 measu re 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 lea d 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 fo r 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

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, particu larly any ex posed meta l 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
METAL PART

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.52166)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES 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 three-line digital comb filter, the refreshed image can be seen.

VIDEO STATUS

Expression of a favorite screen can be choosen by the VIDEO STATUS function. (STANDARD, THEATER, DYNAMIC, GAME)

COMPONENT VIDEO INPUT TERMINAL

Since the component video input terminal is equipped, it reappears direct without deterriorating the signal from DVD or Video player.

BBE

Because build in the BBE circuit, improved the sound of conversation.

MTS STEREO SYSTEM

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

TELETEXT (CLOSED CAPTION)

Title TELETEXT broadcast of C1~C4 and T1~T4 formula is receivable.

V-CHIP

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

ON / OFF TIMER

The on/off timer lets you program your television to turn itself on or off. You can use it as an alarm to wake up, to help you remember
important programs, or as a decoy when you're not home.

HYPER SCAN

A quick favorite program can be looked for by the HYPER-SCAN function.

2.2 MAIN DIFFERENCE LIST Item AV-20FA44/SA AV-N21A44/SA

MAIN PWB SFJ-1001A-M2 SFJ-1002A-M2
FRONT CABI ASSY GQ10063-001B-A GQ10063-002B-A
RATING LABEL GQ30032-001A-A GQ20001-001A-A
A.H.S Available --­V-CHIP Available ---

1-4 (No.52166)

2.3 FUNCTIONS

 FRONT PANEL

 REAR TERMINAL

INPUT 3

VIDEO L MONO AUDIO R

INPUT 1 INPUT 2

MENU CHANNEL VOLUME

OPERATE

INPUT-3 VIDEO
INPUT-3 AUDIO L
INPUT-3 AUDIO R
MENU key
CHANNEL-/+, OPERATE / keys
VOLUME -/+ keys

AUDIO

L/MONOL/MONO

COMPONENT

VIDEO

VIDEO/Y

P

B

PR

S-VIDEO

OVER

VIDEO

AUDIO OUT

L

RRR

 REMOTE CONTROL UNIT (RM-C1251)

TV

CATV VCR

INPUT

DISPLAY

SLEEP TIMER

SOUND

VIDEO STATUS

THEATER PRO

MUTING

VOL

-

MENU

VCR CHANNEL

PREV NEXT

REC

OPEN/CLOSE

ASPECT

POWER

DVD

1

2

4

5

7

8

100+

0

CH +

CH -

VCR/DVD

POWER

PLAY FFREW

STOP PAUSE

STILL/PAUSE

LIGHT

C.C.

VOL

EXIT

TV/VCR

3

6

9

RETURN+

+

75

(VHF/UHF)

AUDIO OUTPUT (L, R)
INPUT-1 (VIDEO, L/MONO, R)
INPUT-1 (S-VIDEO)
INPUT-2 (L/MONO, R)
INPUT-2 (VIDEO/Y, PB, PR)
Antenna terminal (VHF/UHF)

TV/CATV switch
VCR/DVD switch
INPUT key
DISPLAY key
SLEEP TIMER key
SOUND key
VIDEO STATUS key
THEATER PRO key
ASPECT key
MUTING key
VOLUME(-/+) keys
MENU key
POWER key
Channel number keys
LIGHT key
C.C. key
CHANNEL(-/+) keys
EXIT key
VCR/DVD operate keys

RM-C1251G

TV

(No.52166)1-5

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

(1) Unplug the power plug.
(2) Remove the 7 screws [A] as shown in the Fig.1.
(3) Remove the 4 screws [B] as shown in the Fig.1.
(4) Withdraw the REAR COVER toward you.

3.1.2 REMOVING THE MAIN PWB

• Remove the REAR COVER.

(1) Raise the backside of the MAIN PWB, and remove the

PWB STOPPER [C] from the cabinet.

(2) Withdraw the MAIN PWB backward. (If necessary, remove

the wire clamp, connectors etc.)

3.1.3 REMOVING THE SPEAKER

• Remove the REAR COVER.

(1) Remove the 2 screws [D], then remove the SPEAKER with

spacer, as shown in Fig.1.

(2) Remove the 4 screws [E] to detach the SPEAKER from

spacer.

(3) Follow the same steps when remove the other hand

SPEAKER.

NOTE:

When removing the 2 screws [D] of the SPEAKER, remove the
lower side screw first, and then remove the upper one.

3.1.4 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.

3.1.5 CAUTION

(1) When erecting the PW Board, be careful so that there will

be no contacting with other PW Board.

(2) Before turning on power, make sure that the wire connector

is properly connected.

(3) 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.

3.1.6 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.

1-6 (No.52166)

FRONT CABINET

E

SPEAKER

SPEAKER
HOLDER

CRT SOCKET PWB

SPACER

D

HVT

REAR COVER

MAIN PWB

C

(PWB STOPPER)

POWER CORD

Fig.1

B

A

(No.52166)1-7

3.2 REPLACEMENT OF MEMORY IC

3.2.1 MEMORY IC

This model use a memory IC. This memory IC stores data for proper operation of the video and de flection circuits.
When replacing, be sure to use an IC containing this (initial value) data.

3.2.2 PROCEDURE FOR REPLACING MEMORY IC

1. Power off

Switch the power off and unplug the power cord from the

SERVICE MENU

outlet

2. Replace IC.

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

3. Power on

Plug the power cord into the outlet and switch the power on.

1.V/C(S)

3.SOUND(A)

7.LOW LIGHT

9.VCO

11.I2C BUS

2.DEF(D)

4.OT HERS(F)

8.HIGH LIGHT

4. User settings

Check the user setting items according to after page.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS (USER'S GUIDE) and set the items as
described.

5. Receive channel setting

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

6.SERVICE MENU setting

Verify what to set in the SERVICE MENU, and set whatever
is necessary. Refer to the ADJUSTMENT for setting.
Before entering the SERVICE MENU, confirm that the
setting of TV / CATV SW of the REMOTE CONTROL UNIT
is at the "TV" side and the setting of VCR / DVD SW is at the
"VCR" side. If the switches have not been properly set, you
cannot enter the SERVICE MENU.

(1) Press [SLEEP TIMER] key and while the indication of

SLEEP TIMER 0 MIN is being displayed, press
[DISPLAY] key and [VIDEO STATUS] key on the
remote control unit (Fig.2) simultaneously.

(2) The SERVICE MENU screen as shown in Fig.1 is

displayed.

(3) Verify what to set in the SERVICE MENU, and set

whatever is necessary (Fig.1).
Refer to the SERVICE ADJUSTMENT for setting.

(4) Press the [EXIT] key twice to return normal screen.

SELECT BY
OPERATE BY

TV/CATV SW

DISPLAY

SLEEP TIMER

VIDEO STATUS

VOLUME - / +

TV

CATV VCR

INPUT

DISPLAY

SLEEP TIMER

SOUND

VIDEO STATUS

THEATER PRO

MUTING

VOL

MENU

-

Fig.1

DVD

1

4

7

100+

ASPECT

CH +

CH -

Fig.2

POWER

2

5

8

0

RETURN+

LIGHT

C.C.

VOL

+

EXIT

EXIT BY

3

6

9

EX IT

VCR/DVD SW

CHANNEL - / +

EXIT

1-8 (No.52166)

3.3 FACTORY SHIPPING VALUES

3.3.1 SETTING OF REMOTE CONTROL UNIT
Setting item Setting value Setting item Setting value

POWER Off DISPLAY ON
CHANNEL CH - 02 VIDEO STATUS DYNAMIC
VOLUME 10 ASPECT 4:3
TV / VIDEO TV

3.3.2 SETTING OF MENU SCREEN
Setting item Setting value Setting item Setting value

PICTURE MODE CLOCK / TIMER MODE

TINT Center SET CLOCK OFF
COLOR Center ON TIME 7:00 PM
PICTURE Center OFF TIME 10:00 PM
BRIGHT Center CHANNEL 02
DETAIL Center ON VOLUME CURRENT
COLOR TEMPERATURE HIGH MODE EVERY DAY
NOISE MUTING ON ON/OFF TIMER OFF
VSM OFF INITIAL SETUP MODE

SOUND MODE LANGUAGE ENG [AV-20FA44]
BASS Center SPA [AV-N21A44]
TREBLE Center FRONT PANEL LOCK OFF
BALANCE Center AUTO SHUT OFF OFF
MTS STEREO CLOSED CAPTION OFF
A.H.S [AV-20FA44] OFF AUTO TUNER SETUP CABLE
BBE ON V - CHIP [AV-20FA44] OFF

SET LOCK CODE (0000)
XDS ID [AV-20FA44] ON

(No.52166)1-9

3.3.3 SERVICE MENU SETTING ITEMS
Setting item Setting value Setting item Setting value

1.V/C BRIGHT
PICTURE
COLOR
TINT
DETAIL
BRIGHT+­PICT+­COLOR+­TINT+­DETAIL+­R CUTOFF
G CUTOFF
B CUTOFF
R DRIVE
B DRIVE
R CUT+­G CUT+­B CUT+­R DRV+­B DRV+­AGC ADJUST

2.DEF AFC GAIN
H POSI
H.POSI+­V. SIZE
V. SIZE+­V. S CORR
V. S CO+­V. LIN
V. LIN+­H. SIZE
WVMT TOP
WVMT BTM
EWCR TOP
EWCR T+­EWCR BTM
EWCR B+­EW PARA
RE PARA+­BLANK SW

3.SOUND IN LEVEL
FH MON
ST VCO
PIL CAN
FILTER
LOW SEP
HI SEP
5FH MON
SAP VCO

4.OTHERS OSD POSI
OSD FREQ
CCD POSI
CCD FREQ
CCD CONT
PUR CONT
VNR CHK
VCSN TM
CCD PCHK

7. LOW LIGHT ---

8. HIGH LIGHT ---

9. VCO ---

11. I2C BUS VIDEO IN
VM
NOISE CR
CLR TEMP
THEATER
THEA PRO
BBE
SOUND
16:9 MD
HYP SCAN
ID DISP
CCD
V CHIP
V CHIP CAN
JVC LOGO
PIM
COMP

1-10 (No.52166)

3.4 REPLACEMENT OF CHIP COMPONENT

3.4.1 CAUTIONS

(1) Avoid heating for more than 3 seconds.
(2) Do not rub the electrodes and th e 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.

3.4.2 SOLDERING IRON

(1) Use a high insulation soldering iron with a thin pointed end of it.
(2) A 30w soldering iron is recommended for easil y removing parts.

3.4.3 REPLACEMENT STEPS

1. How to remove Chip parts

2. How to install Chip parts

[Resistors, capacitors, etc.]

(1) As shown in the figu re, 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 figu re, 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.52166)1-11

SECTION 4

ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) There are 2 ways of adjusting this T V : One is with the REMOTE CONTROL UNIT and the other is the conventi onal

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 warning 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.

(7) Preparation for adjustment. Unless otherwise specified in the adjustment items, preset the following functions with the REMOTE

CONTROL UNIT.

Item Preset value

VIDEO STATUS STANDARD
TINT/COLOR/BRIGHT/PICTURE/DETAIL Center
COLOR TEMPERATURE HIGH
VSM OFF
BASS/TREBLE/BALANCE Center
MTS STEREO
BBE OFF
A.H.S OFF
ASPECT 4:03
NOISE MUTING OFF

4.2 MESURING INSTRUMENT AND FIXTURES

(1) DC voltmeter (or digital voltmeter)
(2) Oscilloscope
(3) Frequency counter
(4) Signal generator (Pattern generator : NTSC)
(5) TV audio multiplex signal generator
(6) Remote control unit

4.3 ADJUSTMENT ITEM

• B1 POWER SUPPLY

•IF VCO

•RF AGC

• HIGH VOLTAGE HOLD DOWN CIRCUIT

• FOCUS

• V. SIZE AND V. CENTER (4:3)

• V. SIZE AND V. LINEARITY (16:9)

• H. POSITION, H. SIZE AND EW PARA (4:3)

• H. POSITION AND H. SIZE (16:9)

• WHITE BALANCE (LOW LIGHT)

• WHITE BALANCE (HIGH LIGHT)

• SUB BRIGHT

• SUB CONTRAST

• MTS INPUT LEVEL

• MTS STEREO VCO

• MTS SAP VCO

• MTS FILTER

• MTS SEPARATION

• PURITY AND CONVERGENCE

1-12 (No.52166)

4.4 ADJUSTMENT LOCATIONS

CRT SOCKET PWB

(SOLDER SIDE)

T

MAIN PWB

POWER SW

PW

TO MAIN PWB

TP-E

TP-B

U

E1

TO MAIN PWB

CRT EARTH
(BRAIDED ASS'Y)

FRONT

VOL+

VOL-

TO CRT SOCKET PWB

CH+

TOP

)

(

CH- MENU

S

AC

F1901

FUSE

DEG

DEG. COIL

1 : B1

2 : NC
3 : GND

IC1201

IC1851

V CENTER SW

TUNER

CB1

TO SPEAKER

TO CRT SOCKET PWB

HV

S1401

1, 3 : HIGH VOLTAGE
HOLD DOWN

U X

UPPER : FOCUS

LOWER : SCREEN

(No.52166)1-13

4.4.1 TOOL OF SERVICE MENU OPERATION

Operate the SERVICE MENU with the REMOTE CONTROL UNIT.

4.4.2 SERVICE MENU ITEMS

With the SERVICE MENU, various adjustment can be made, and they are broadly classified in the following items of settings.

(1) V/C(S) This mode adjusts the VIDEO circuit.
(2) DEF(D) This mode adjusts the DEFLECTION circuit.
(3) SOUND(A) This mode adjusts the AUDIO circuit.
(4) OTHERS(F) This mode adjusts the various settings except V/C, DEF and SOUND(Do not change the values).
(7) LOE LIGHT This mode adjusts the WHITE BALANCE (LOW LIGHT)
(8) HIGH LIGHT This mode adjusts the WHITE BALANCE (HIGH LIGHT)
(9) VCO This mode adjusts the VCO

2

(11) I2C BUS This mode adjusts the I

C BUS (They are fixed).

4.4.3 BASIC OPERATION IN SERVICE MENU

4.4.3.1 HOW TO ENTER THE SERVICE MENU

Before entering the SERVICE MENU, confirm that the setting of
TV / CATV SW of the REMOTE CONTROL UNIT is at the "TV"

SERVICE MENU

side and the setting of VCR / DVD SW is at the "VCR" side.
If the switches have not been properly set, you cannot enter the
SERVICE MENU.
Press the [SLEEP TIMER] key and set the SLEEP TIMER for "0
MIN".
Then press the [DISPLAY] key and [VIDEO STATUS] key of the
remote control unit at the sama time to enter the SERVICE

1.V/C(S)

3.SOUND(A)

7.LOW LIGHT

9.VCO

11.I2C BUS

2.DEF(D)

4.OT HERS(F)

8.HIGH LIGHT

MENU.

4.4.3.2 SUB MENU SCREEN SELECTION

Press [CHANNEL (-/+)] keys of the remote control unit, and

SELECT BY
OPERATE BY

EXIT BY

EX IT

select the SUB MENU SCREEN from SERVICE MENU.
To select any of the SUB MENU items. The letter of the selected
item is displayed in yellow.

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

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

7. LOW LIGHT 8. HIGH LIGHT

9. VCO

11. I2C BUS

4.4.3.3 SETTING METHOD
[1.V/C(S), 2.DEF(D) AND 3.SOUND(A) ADJUSTMENT MODE]

Press the [CHANNEL (-/+)] keys to select the one of setting
item from S01 BRIGHT to S21 AGC ADJ.
Press the [VOLUME (-/+)] keys to change the setting value.
The setting value will be stored automatically when release the
REMOTE CONTROL UNIT keys.
It can adjust the items 2.DEF(D) and 3.SOUND(A) in the same
procedure.

[7.LOW LIGHT, 8.HIGH LIGHT AND 9.VCO ADJUSTMENT
MODE]

Since the key operation in this mode is peculiar, please refer
to the clause of the "ADJUSTMENT PROCEDURE".

[4.OTHERS AND 11.I2C BUS ADJUSTMENT MODE]

These are no requirement for adjustment. Don't change these
values.

4.4.3.4 RELEASE OF SERVICE MENU

When adjustment is completed, press the [EXIT] key twice. Then
return to the normal screen.

DISPLAY

SLEEP TIMER

VIDEO STATUS

VOLUME - / +

TV

CATV VCR

INPUT

DISPLAY

SLEEP TIMER

SOUND

VIDEO STATUS

THEATER PRO

MUTING

VOL

MENU

POWER

DVD

1

3

2

4

6

5

7

9

8

RETURN+

100+

0

LIGHT

ASPECT

C.C.

CH +

-

VOL

+

CH -

EXIT

CHANNEL - / +

EXIT

1-14 (No.52166)

4.4.4 SERVICE MENU FLOW CHART

MAIN MENU

SERVICE MENU

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

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

7.LOW LIGHT 8.HIGH LIGHT

9.VCO

11.12C BUS

SELECT BY
OPERATE BY EXIT BY

EXIT

1.V/C(S)

RF 4 : 3 STD LOW

S01 BRIGHT

2.DEF(D)

RF 4 : 3 STD LOW

D02 H. POSI

3.SOUND(A)

7.LOW LIGHT

8.HIGH LIGHT

9.VCO

Do not adjust

A01 IN LEVEL

4.OTHERS(F)

F01 OSD POSI

TOO HIGH GOOD TOO LOW

SYNC: YES

AFC ON

FINE 0

11.I2C BUS

Do not adjust

I2C BUS ON

(No.52166)1-15

4.5 INITIAL SETTING VALUE OF SERVICE MENU

(1) Adjustment of the SERVICE MENU is made on the basi s of the initial setting values. Ho wever, the new setting values which

displays on the screen in its optimum condition may differ from the initial setting value.
(2) Do not change the initial setting values of the items not listed in "ADJUSTMENT PROCEDURE".
(3) "---" is impossible to adjust or not requirement to adjustment.

4.5.1 [1. V/C]
Initial setting value

No. Setting item Variable range

STANDARD THEATER STANDARD THEATER STANDARD THEATER

S01 BRIGHT 0~127 64 --- --- --- --- --­S02 PICTURE 0~127 65 --- --- --- --- --­S03 COLOR 0~127 41 --- --- --- 56 --­S04 TINT 0~127 63 --- --- --- 64 --­S05 DETAIL 0~63 30 --- 35 --- 40 --­S06 BRIGHT +- -127~+128 --- 0 1 --- 1 --­S07 PICT +- -127~+128 --- -15 0 --- 0 --­S08 COLOR +- -127~+128 --- -3 0 --- --- --­S09 TINT +- -127~+128 --- -6 -4 --- --- --­S10 DETAIL +- -127~+128 --- 3 --- --- --- ---

RF EXTERNAL (S, CV) EXTERNAL (COMPONENT)

Initial setting value

No. Setting item Variable range

LOW HIGH LOW HIGH LOW HIGH LOW HIGH

S11 R CUTOFF 0~255 30 --- --- --- --- --- --- --­S12 G CUTOFF 0~255 30 --- --- --- --- --- --- --­S13 B CUTOFF 0~255 30 --- --- --- --- --- --- --­S14 R DRIVE 0~127 64 --- --- --- --- --- --- --­S15 B DRIVE 0~127 64 --- --- --- --- --- --- --­S16 R CUT +- -127~+128 --- 0 0 0 0 --- --- --­S17 G CUT +- -127~+128 --- 0 0 0 0 --- --- --­S18 B CUT +- -127~+128 --- 0 0 0 0 --- --- --­S19 R DRV +- -127~+128 --- 5 13 7 0 --- --- --­S20 B DRV +- -127~+128 --- 6 -25 -9 0 --- --- ---

No. Setting item Variable range Initial setting value

S21 AGC ADJUST 0~127 80

RF/EXTERNAL(S, CV) EXTERNAL(COMPONENT)

STANDARD THEATER STANDARD THEATER

1-16 (No.52166)

4.5.2 [2. DEF]

No. Setting item Variable range

D01 AFC GAIN 0~3 0 0 2
D02 H. POSI 0~31 13 --- 13
D03 H. POSI +- -127~+128 --- 0 --­D04 V. SIZE 0~125 65 --- 65
D05 V. SIZE +- -127~+128 --- -30 --­D06 V. S CORR 0~15 0 --- 0
D07 V. S CO +- -127~+128 --- 0 --­D08 V. LIN 0~15 8 --- 8
D09 V. LIN +- -127~+128 --- 0 --­D10 H. SIZE 0~63 32 --- 32
D11 H. SIZE +- -127~+128 --- 0 --­D12 WVMT TOP 0~3 0 0 0
D13 WVMT BTM 0~3 0 0 0
D14 EWCR TOP 0~31 16 --- 16
D15 EWCR T +- -127~+128 --- 0 --­D16 EWCR BTM 0~31 16 --- 16
D17 EWCR B +- -127~+128 --- 0 --­D18 EW PARA 0~63 26 --- 26
D19 EW PARA +- -127~+128 --- 0 --­D20 BLANK SW 0~1 0 0 0

RF(4:3) RF(16:9) EXTERNAL(4:3)

Initial setting value

4.5.3 [3. SOUND]
No. Setting item Variable range Initial setting value

A01 IN LEVEL 0~63 17
A02 FH MON 0~1 0
A03 ST VCO 0~63 36
A04 PIL CAN 0~1 0
A05 FILTER 0~63 35
A06 LOW SEP 0~63 7
A07 HI SEP 0~63 18
A08 5FH MON 0~1 0
A09 SAP VCO 0~63 37

4.5.4 [4. OTHERS]
No. Setting item Variable range Initial setting value

F01 OSD POSI 0~255 28
F02 OSD FREQ 0~255 85
F03 CCD POSI 0~255 47
F04 CCD FREQ 0~255 94
F05 CCD CONT 0~63 11
F06 PUR CONT 0~63 62
F07 VNR CHK 0~255 3
F08 VCSN TM 0~255 5
F09 CCD PCHK 0~1 1

(No.52166)1-17

4.5.5 [11. I2C BUS]
No. Setting item Variable range Initial setting value

SYS01 VIDEO IN 0~4 3
SYS02 VM 0~1 1
SYS03 NOISE CR 0~1 0
SYS04 CLR TEMP 0~1 1
SYS05 THEATER 0~1 1
SYS06 THEA PRO 0~1 1
SYS07 BBE 0~1 1
SYS08 SOUND 0~1 1
SYS09 16:9 MD 0~1 1
SYS10 HYP SCAN 0~1 1
SYS11 ID DISP 0~1 1
SYS12 CCD 0~1 1
SYS13 V CHIP 0~1 1
SYS14 V CHIP CA 0~1 1
SYS15 JVC LOGO 0~1 1
SYS16 PIM 0~1 1
SYS17 COMP 0~1 1

1-18 (No.52166)

4.6 ADJUSTMENT PROCEDURE

4.6.1 CHECK ITEM

Item

B1 POWER
SUPPLY
check

HIGH VOLTAGE
HOLD DOWN
check

Measuring

instrument

DC voltmeter
Signal

generator
Resistor

(18.0kΩ,
1/4W)

RESISTOR

18.00 k 1%

B1 Connector
TP-91
TP-E
[MAIN PWB]

X connector
(1-pin, 3-pin)
[MAIN PWB]

X3 2 1

Test point Adjustment part Description

(1) Receive the black and white signal (color off).
(2) Connect the DC voltmeter to TP-91 (B1 connector 1

pin) and TP-E (B1 connector 3 pin).

(3) Confirm that the voltage is DC134V±2V.

• After reparing 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 be tween X

connector 3-pin and 4-pin.

(3) Make sure that the screen picture disappeares.

HEATER

(4) Disconnect the power plug.
(5) Remove the resistor.
(6) Again connect the power plug.

T521

CONNECTOR

(7) Turn the power switch to on.
(8) Make sure that the normal picture is displayed on the

screen.

4

4.6.2 TUNER / IF CIRCUIT

Item

Measuring

instrument

IF VCO Remote

control unit

TOO HIGH GOOD TOO LOW

SYNC: YES
AFC ON
FINE 0

RF AGC Signal

generator
Remote

control unit

No

S21

Setting item

AGC ADJ

Test point Adjustment part Description

[9. VCO]

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

CW transf.(T111)
[MAIN PWB]

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

"TOO LOW" by CW transf. on MAIN PWB, and
check the "SYNC" is "YES".

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

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

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

[1.V/C(S)]
S21:AGC ADJ

(1) Receive the black and white signal (color off).
(2) Select 1.V/C(S).
(3) Select < S21 >(AGC ADJ).
(4) With the [VOLUME (-)] key to get the noise in the

screen picture (zero side of setting value).
(5) Press the [VOLUME (+)] key several times and step

Initial Setting value

when noise disappeares from the screen (at this

time, not to increase the value too much).
(6) Change to other channel and make sure that there is

80

no irregularity.

(No.52166)1-19

4.6.3 FOCUS

Item

FOCUS Signal

Measuring

instrument

generator

Test point Adjustment part Description

FOCUS VR
[In HVT]

FOCUS POINT

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

to the vertical and horizontal lines will be clear and in
fine detail.

(3) Make sure that the picture is in focus even when the

screen gets darkened.

1-20 (No.52166)

4.6.4 DEFLECTION CIRCUIT

Item

4:3
V. SIZE /

Measuring

instrument

Signal
generator

V. CENTER

Remote
control unit

Test point Adjustment part Description

[2.DEF(D)]
D04:V. SIZE

(1) Receive the crosshatch signal.
(2) Select the ASPECT to 4:3.
(3) Select 2.DEF(D).

V.CENTER SW
(S1401)
[MAIN PWB]

(4) Select < D04 >(V. SIZE).
(5) Adjust < D04 > so that the vertical screen size

become 90%.
(6) Switch the V. CENTER SW to agree the vertical

center with display center.

Screen

size
90%

No

D04

16:9
V. SIZE /
V. LINEARITY

Signal
generator

Remote
control unit

Picture

size

100%

Initial setting valueSetting item

65V. SIZE

[2.DEF(D)]
D05:V. SIZE+­D09:V. LIN +-

(1) Receive the crosshatch signal.
(2) Select the ASPECT to 16:9.
(3) Select 2.DEF(D).
(4) Select < D05 >(V. SIZE +-).
(5) Adjust < D05 > so that the amplitude of the upper

and lower side of the raster may become the same.
(6) Select < D09 >(V. LIN+-).

Blanking

(7) Adjust < D09 > so that the width of the blanking may

become the same at the upper and lower sides.

No

D05

D09

Setting item

Blanking

Initial setting value

-30V. SIZE+-

0V. LIN+-

(No.52166)1-21

Item

4:3
H. POSITION /
H. SIZE /
SIDE PIN

Measuring

instrument

Signal
generator

Remote
control unit

Test point Adjustment part Description

[2.DEF(D)]
D02:H. POSI
D10:H. SIZE
D18:EW PARA
D14:EWCR TOP
D16:EWCR BTM

(1) Receive the crosshatch signal.
(2) Select the ASPECT to 4:3.
(3) Select 2.DEF(D).
(4) Select < D02 >(H. POSI).
(5) Adjust < D02 > so that left width and right width of the

crosshatch screen become equal.

(6) Select < D10 >(H. SIZE).

Screen size 90%

(7) Adjust < D10 > so that the h orizontal screen width

become 90%.
(8) Select < D18 >(EW PARA).
(9) Adjust < D18 > so that the vertical line become

straight at both side of top and bottom.

(10) If the vertical lines are not straight at the top and

bottom on the screen, select < D14 >(EWCR TOP)

and < D16 >(EWCR BTM).

(11) Adjust < D14 > and < D16 > so that the vertical lines

become straight.

No Initial seting valueSetting item

16:9
H. POSITION /
H. SIZE

Signal
generator

Remote
control unit

Picture size 100%

Screen size 90%

[2.DEF(D)]
D03:H. POSI+­D11:H. SIZE+­D15:EWCR T+­D17:EWCR B+­D19:EW PARA+-

D02

D10

D18

D14

D16

H. POSI

H. SIZE

EW PARA

EW PARA

EW PARA

13

32

26

16

16

(1) Receive the crosshatch signal.
(2) Select the ASPECT to 16:9.
(3) Select < D03 >(H. POSI+-).
(4) Adjust < D03 > so that left and right width of the

crosshatch screen become equal.
(5) Select < D11 >(H. SIZE+-).
(6) Adjust < D11 > so that the h orizontal screen width

become 90%.
(7) Select < D19 >(EW PARA+-), < D15 >(EW CR T+-)

and < D17 >(EW CR B+-).
(8) Adjust < D19 >, < D15 > and < D17 > so that second

vertical line from lenft and right edges become

straight at top and bottom.

No

D03

Setting item

H. POSI+-

Initial setting value

0

1-22 (No.52166)

Picture size 100%

D11

D15

D17

D19

H. SIZE+-

EWCR T+-

EWCR B+-

EW PARA+-

0

0

0

0

4.6.5 VIDEO CIRCUIT

Item

WHITE
BALANCE

Measuring

instrument

Signal
generator

(LOW LIGHT)

Remote
control unit

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

H LINE ON

DISPLAY

SLEEP TIMER

SOUND

VIDEO STATUS

THEATER PRO

MUTING

VOL

-

1

4

7

100+

ASPECT

CH +

Test point Adjustment part Description

[7.LOW LIGHT]

(1) Receive the black and white signal (color off).

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

(3) Set the initial setting value of < S11 >(R CU TOFF),

< S12 >(G CUTOFF), < S13 >(B CUTOFF) and
< S01 >(BRIGHT).

(4) At this time, once exit 1.V/C(S) to SERVICE MAIN

MENU by pressing the [EXIT] key.

(5) Select 7.LOW LIGHT.
SCREEN VR
[In HVT]

(6) Display the single horizonta l 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 color

R CUTOFF

H LINE OFF

G CUTOFF

apperares faintly.
(9) Adjust the two colors which did not ap pear until the

single horizontal line that is dsiplayed become white

using the [4] to [9] keys.

2

5

8

0

RETURN+

LIGHT

C.C.

3

6

9

EXIT

B CUTOFF

B CUTOFF

G CUTOFF

R CUTOFF

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

is displayed faitly.

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

mode.

(12) Adjust < S01 > to become the black component

shines white slightly by [VOLUME] key.

(13) Confirm th at whether the color ingredient of R, G or

B is visible to the black component, which shines

white slightly.

(14) When the color ingredient can be see n, two colors

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

VOL

BRIGHT

+

to look white.

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

NOTE:

If the [3] key is pressed, it can escape from WHITE
BALANCE adjustment mode.

CUTOFF ADJUSTMENT SCREEN

7.LOW LIGHT

BRIGHT

(S01, VOLUME KEY)

G CUTOFF

(S12, 5/8KEY)

R CUTOFF

(S11, 4/7KEY)

B CUTOFF

(S13, 6/9KEY)

No

S11

S12

S13

S01

Initial setting valueSetting item

30R CUTOFF

30G CUTOFF

30B CUTOFF

64BRIGHT

(No.52166)1-23

Item

WHITE
BALANCE
(HIGH LIGHT)

Measuring

instrument

Signal

Test point Adjustment part Description

[8.HIGH LIGHT]

generator

[1.V/C(S)]
Remote
control unit

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

R DRIVE

DISPLAY

SLEEP TIMER

SOUND

VIDEO STATUS

THEATER PRO

100+

ASPECT

1

4

7

2

5

8

0

3

6

9

RETURN+

LIGHT

S14:R DRIVE

S15:B DRIVE

EXIT

B DRIVE

B DRIVE

R DRIVE

(1) Receive the black and white signal (color off).
(2) Select 1.V/C(S).
(3) Select < S14 >(R DRIVE) and < S15 >(B DRIVE).
(4) Set the initial setting value of < S14 >(R DRIVE) and

< S15 >(B DRIVE) with the [4], [6], [7] and [9] keys.

(5) At this time, once exit 1.V/C(S) to SERVICE MAIN

MENU by pressing the [EXIT] key.
(6) Select 8.HIGH LIGHT.
(7) Adjust the screen until it becomes white by using the

[4], [6], [7] and [9] keys.

NOTE:

If the [3] key is pressed, it can escape form WHITE
BALANCE adjustment mode.

DRIVE ADJUSTMENT SCREEN

R DRIVE

(S14, 4/7KEY)

No

S14

S15

R DRIVE

G DRIVE

SUB BRIGHT Remote

control unit

No

S01

BRIGHT

8.HIGH LIGHT

Initial setting valueSetting item

Initial setting valueSetting item

B DRIVE

(S15, 6/9KEY)

64

64

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

64

(1) Receive the broadcast.
(2) Select 1.V/C(S).
(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.

1-24 (No.52166)

Item

SUB
CONTRAST

No

S02

Remote
control unit

Setting item

4.6.6 MTS CIRCUIT

Measuring

instrument

PICTURE

Test point Adjustment part Description

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

(1) Receive the broadcast.
(2) Select 1.V/C(S).
(3) Select < S02 >(PICTURE).

Initial setting value

(4) Set the initial setting value of < S02 > with the

[VOLUME (-/+)] key.

(5) If the contrast is not the best wi th the initial setting

65

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

Item

MTS INPUT
LEVEL
check

No

A01

MTS STEREO
VCO

No

A02

A03

Measuring

instrument

Remote
control unit

Setting item

IN LEVEL

Frequency
counter

Remote
control unit

Setting item

FH MON

ST VCO

Test point Adjustment part Description

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

(1) Select 3.SOUND(A).
(2) Select < A01 >(IN LEVEL).
(3) Verify that < A01 > is set at its initial setting value.

Initial setting value

17

R OUT
[AUDIO OUT]

[3.SOUND(A)]
A02:FH MON
A03:ST VCO

(1) Receive the RF signal ( no modulated sound signal)

from the antenna terminal.
(2) Select 3.SOUND(S).
(3) Select < A02 >(FH MON) and change the setting

value from 0 to 1.
(4) Connect the frequency counter to R OUT of the

Initial setting value

AUDIO OUT.
(5) Select < A03 >(ST VCO).
(6) Set the initial setting value of < A03 >.

0

(7) Adjust < A03 > so that the frequency counter display

15.73kHz ±0.1kHz.

36

(8) Select < A02 >, and reset the setting value from 1 to 0.

MTS SAP VCO Frequency

counter
Remote

control unit

No

A08

A09

Setting item

5FH MON

SAP VCO

R OUT
[AUDIO OUT]

Initial setting value

[3.SOUND(A)]
A08:5FH MON
A09:SAP VCO

0

37

(1) Receive the RF signal ( no modulated sound signal)

from the antenna terminal.
(2) Select 3.SOUND(S).
(3) Select < A08 >(5FH MON) and reset the setting

value from 0 to 1.
(4) Connect the frequency counter to R OUT of the

AUDIO OUT.
(5) Select < A09 >(SAP VCO).
(6) Set the initial setting value of < A09 >.
(7) Adjust < A09 > so that the frequency counter display

78.67kHz ±0.5kHz.

(8) Select < A08 >, and reset the setting value from 1 to 0.

(No.52166)1-25

Item

Measuring

instrument

MTS FILTER Remote

control unit

No

Setting item

Test point Adjustment part Description

[3.SOUND(A)]
A04:PIL CAN
A05:FILTER

(1) Select 3.SOUND(A).
(2) Select < A04 >(PIL CAN) and < A05 >(FILTER).
(3) Verify that < A04 > and < A05 > are set at initial

setting value.

Initial setting value

A04

A05

MTS
SEPARATION

1 cycle

No

PIL CAN

FILTER

TV audio
multiplex
signal
generator

Oscilloscope
Remote

control unit

L-Channel
signal waveform

R OUT
L OUT
[AUDIO OUT]

R-Channel
crosstalk portion

Minimum

Initial setting valueSetting item

0

35

[3.SOUND(A)]
A06:LOW SEP
A07:HI SEP

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

multiplex signal generator to the antenna terminal.

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

OUT, and display one cycle portion of the 300Hz

signal.
(3) Select 3.SOUND(A).
(4) Select < A06 >(LOW SEP).
(5) Set the initial setting value of < A06 >.
(6) Adjust < A06 > so that the stroke element of the

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

pin of the AUDIO OUT, and enlarge the voltage axis.
(8) Select < A07 >(HI SEP).
(9)Change the signal to 3k Hz, and similarly adjust

< A07 >.

A06

A07

LOW SEP

HI SEP

7

18

1-26 (No.52166)

4.6.7 PURITY AND CONVERGENCE
 PURITY ADJUSTMENT

(1) Demagnetize CRT with the demagnetizer.

(2) Loosen the retainer screw of the deflection yoke.

(3) Remove the wedges.

(4) Input a green raster signal from the sign al generator, and

turn the screen to green raster.

(5) Move the deflection yoke backward.

(6) Bring the long lug of the purity magnets on the short lug and

position them horizontally. (Fig.2)

(7) Adjust the gap between two lugs so that the GREEN

RASTER will come into the center of the screen. (Fig.3)

WEDGE

CRT

P/C MAGNETS

P : PURITY MAGNET
4 : 4 POLES (convergence magnets)
6 : 6 POLES (convergence magnets)

DEFLECTION

YOKE

P

46

P / C

MAGNETS

Fig.1

(8) Move the deflection yoke forward, and fix the position of the

deflection yoke so that the whole screen will become green.

(9) Insert the wedge to the top side of the deflection yoke so that

it will not move.

(10) Input a crosshatch signal.

(11) Verify that the screen is horizontal.

(12) Input red and blue raster signals, and make sure th at p urity

is properly adjusted.

Long lug

Short lug

(FRONT VIEW)

PURITY MAGNETS

Bring the long lug over the short lug
and position them horizontally.

Fig.2

GREEN RASTER

CENTER

Fig.3

(No.52166)1-27

 STATIC CONVERGENCE ADJUSTMENT

(1) Input a crosshatch signal.

(2) Using 4-pole convergence magnets, overlap the red and

blue lines in the center of the screen (Fig.1) and turn them
to magenta (red/blue).

(3) Using 6-pole convergence ma gnets, overlap the magenta

(red/blue) and green lines in the center of the scre en and
turn them to white.

(4) Repeat 2 and 3 above, and make best convergence.

 DYNAMIC CONVERGENCE ADJUSTMENT

(1) Move the deflection yoke up and down and overlap the lines

in the periphery. (Fig. 2)

(FRONT VIEW)

(FRONT VIEW)

BLUE

RED

Fig.1

GREEN

BLUE

RED

(2) Move the deflection yoke left to right and overlap the lines in

the periphery. (Fig. 3)

(3) Repeat 1 and 2 above, and make best convergence.

• After adjustment, fix the wedge at the original position. Fasten
the retainer screw of the deflection yoke. Fix the 6 magnets with
glue.

GREEN

RED

(FRONT VIEW)

GREEN

RED

BLUE

BLUE

GREEN RED

Fig.2

BLUE

Fig.3

GREEN

RED

GREEN

BLUE

RED
GREEN
BLUE

BLUE
GREEN

RED

1-28 (No.52166)

SECTION 5

TROUBLESHOOTING

This service manual does not describe TROUBLESHOOTING.

(No.52166)1-29

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.52166)

Printed in Japan

WPC