jvc AV-14AG16-U Service Manual

SERVICE MANUAL

COLOUR TELEVISION

YA39220066

AV-14AG16/U

BASIC CHASSIS

CG4

TABLE OF CONTENTS

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

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

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

COPYRIGHT © 2006 Victor Company of Japan, Limited

No.YA392

2006/6

SPECIFICATION

Items Contents

Dimensions (W × H × D) 36.4 cm × 33.4 cm × 37.4 cm

Mass 9 kg

TV RF System B/G, I, D/K, M

Colour System PAL

SECAM
NTSC 3.58 / NTSC 4.43

Receiving
Frequency

Intermediate Frequency VIF 38.0 MHz (B/G, I, D/K, M)

Colour Sub Carrier PAL

Power Input AC110 V to AC240 V, 50 Hz / 60Hz

Power Consumption 68 W (Max) / 47W(Avg)

Picture Tube Visible size: 34 cm measured diagonally ( H : 28.7 cm × V : 21.7 cm)

High Voltage 22.5 kV±1.5kV (at zero beam current)

Speaker 8 cm Round type × 1

Audio Power Output 3 W (monaural)

Aerial Input Terminal 75 Ω unbalanced, coaxial

Input Terminal
[Front / Rear]

Output Terminal
[Rear]

Headphone Jack 3.5 mm mini jack × 1
Remote Control Unit RM-C360GY (Battery size : AA / R6 / UM-3 × 2)

VHF Low

VHF High

SECAM

46.25 MHz to 140.25 MHz

147.25 MHz to 423.25 MHz

UHF

431.25 MHz to 863.25 MHz

CATV

Mid (X to Z+2, S1 to S10) / Super (S11 to S20) / Hyper (S21 to S41) bands

SIF 32.5 MHz (5.5 MHz: B/G)

32MHz (6.0 MHz: I)

31.5MHz (6.5 MHz: D/K)

33.5MHz (4.5 MHz: M)

4.43 MHz

4.40625 MHz / 4.25 MHz

NTSC

3.58 MHz / 4.43 MHz

Video

1 V(p-p), 75 Ω, RCA pin jack × 2

Audio

500 mV(rms) (-4 dBs), High impedance, RCA pin jack × 2

Video

1 V(p-p), 75Ω, RCA pin jack × 1

Audio

500 mV(rms) (-4 dBs), Low impedance, RCA pin jack × 1

Design and specifications are subject to change without notice.

1-2 (No.YA392)

SECTION 1

PRECAUTION

1.1 SAFETY PRECAUTIONS

(1) The design of this product contains special hardware,

many circuits and components specially for safety
purposes. For continued protection, no changes should be
made to the original design unless authorized in writing by
the manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be
performed by qualified personnel only.

(2) Alterations of the design or circuitry of the products should

not be made. Any design alterations or additions will void
the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or
property damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These
characteristics are often not evident from visual inspection
nor can the protection afforded by them necessarily be
obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in
the parts list of Service manual. Electrical components

having such features are identified by shading on the
schematics and by ( ) on the parts list in Service
manual. The use of a substitute replacement which does

not have the same safety characteristics as the
recommended replacement part shown in the parts list of
Service manual may cause shock, fire, or other hazards.

(4) Don't short between the LIVE side ground and

ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing.

Some model's power circuit is partly different in the GND.
The difference of the GND is shown by the LIVE : ( ) side
GND, the ISOLATED (NEUTRAL) : ( ) side GND and
EARTH : ( ) side GND.
Don't short between the LIVE side GND and ISOLATED
(NEUTRAL) side GND or EARTH side GND and never
measure the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.). If above note will
not be kept, a fuse or any parts will be broken.

(5) If any repair has been made to the chassis, it is

recommended that the B1 setting should be checked or
adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).

(6) The high voltage applied to the picture tube must conform

with that specified in Service manual. Excessive high
voltage can cause an increase in X-Ray emission, arcing
and possible component damage, therefore operation
under excessive high voltage conditions should be kept to
a minimum, or should be prevented. If severe arcing
occurs, remove the AC power immediately and determine
the cause by visual inspection (incorrect installation,
cracked or melted high voltage harness, poor soldering,
etc.). To maintain the proper minimum level of soft X-Ray
emission, components in the high voltage circuitry
including the picture tube must be the exact replacements
or alternatives approved by the manufacturer of the
complete product.

(7) Do not check high voltage by drawing an arc. Use a high

voltage meter or a high voltage probe with a VTVM.
Discharge the picture tube before attempting meter
connection, by connecting a clip lead to the ground frame

and connecting the other end of the lead through a 10kΩ

2W resistor to the anode button.

(8) When service is required, observe the original lead dress.

Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer's replacement components.

(9) Isolation Check (Safety for Electrical Shock Hazard)

After re-assembling the product, always perform an
isolation check on the exposed metal parts of the cabinet
(antenna terminals, video/audio input and output terminals,
Control knobs, metal cabinet, screw heads, earphone jack,
control shafts, etc.) to be sure the product is safe to operate
without danger of electrical shock.

a) Dielectric Strength Test

The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand a
voltage of 3000V AC (r.m.s.) for a period of one second. (.
. . . Withstand a voltage of 1100V AC (r.m.s.) to an
appliance rated up to 120V, and 3000V AC (r.m.s.) to an
appliance rated 200V or more, for a period of one second.)
This method of test requires a test equipment not generally
found in the service trade.

b) Leakage Current Check

Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer during this check.). Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal part of the cabinet, particularly
any exposed metal part having a return path to the chassis,
to a known good earth ground (water pipe, etc.). Any
leakage current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).

Alternate Check Method

Plug the AC line cord directly into the AC outlet (do not
use a line isolation transformer during this check.). Use

an AC voltmeter having 1000Ω per volt or more
sensitivity in the following manner. Connect a 1500Ω
10W resistor paralleled by a 0.15µF AC-type capacitor

between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part,
particularly any exposed metal part having a return path
to the chassis, and measure the AC voltage across the
resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Any voltage measured must
not exceed 0.75V AC (r.m.s.). This corresponds to

0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)

0.15 F AC-TYPE

PLACE THIS PROBE

1500 10W

GOOD EARTH GROUND

ON EACH EXPOSED
ME TAL PAR T

(No.YA392)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

PICTURE MODE

This function can adjust the picture settings automatically.
There are BRIGHT, STANDARD and SOFT in the PICTURE
MODE.

RETURN +

This function can set a channel you frequently view to the
Return Channel and you can view that channel at any time with
one-touch.

2.2 TECHNINAL INFORMATION

2.2.1 MAIN MI-COM (CPU) PIN FUNCTION

Pin
No.

Pin name I/O Function

1 REMOCON I Remote control 22 PROTECT I Low B protect detection [Detect: H]

2 SDA2 I/O Data for Inter IC control (For main memory) 23 P_ON/OFF I Main power control [ON : H]

3 SCL2 O Clock for Inter IC contorl (For main memory) 24 LOCK - Not used

4 BUS_FREE - Not used 25 3.58/OTH - Not used

5 NC - Not used 26 4.5/OTH - Not used

6 KEY1 I Key scan for front key (Menu CH -/+) 27 H_SYNC I Horizontal sync

7 KEY2 I Key scan for front key (Vol -/+) 28 I/II - Not used

8 ECO IN - Not used 29 OSD_Ys O Ys (blanking) for OSD

9 AFT I AFT voltage for tuner 30 OSD_B O Blue for OSD

10 LED[POW] - Not used 31 OSD_G O Green for OSD

11 LED[TIM] O Liting for timer [Liting : H] 32 OSD_R O Red for OSD

12 GND - GND 33 NC - Not used

13 NC - Not used 34 RST I CPU reset [Reset:L]

14 NC - Not used 35 V_SYNC I Vertical sync

15 TV/V - Not used 36 TCLOCK - Not used

16 TEXT RESET - Not used 37 SDA1 I/O Data for Inter IC control (For generally)

17 ACL ON/OFF - Not used 38 SCL1 O Clock for Inter IC contorl (For generally)

18 VOL O Volume control 39 VDD I 3.3V

19 A_MUTE O Aodio muting [Muting : H] 40 OSC1 I System clock oscillation (4MHz)

20 NC - Not used 41 OSC2 O System clock oscillation (4MHz)

21 TEXT/OTH - Not used 42 VSS - GND

CHILD LOCK

Use this function to prevent children from operating the TV
without parental consent.

VNR

This function can reduce the picture noise.

Pin
No.

Pin name I/O Function

1-4 (No.YA392)

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

• Unplug the power cord.
(1) Remove the 4 screws [A], 1 screw [B] and 1 screw [C] as

shown in Fig.1.

(2) Withdraw the REAR COVER toward you.

CAUTION:

When reinstalling the rear cover, carefully push it inward after
inserting the MAIN PWB into the REAR COVER groove.

3.1.2 REMOVING THE MAIN PW BOARD

• Remove the REAR COVER.
(1) Slightly raise the both sides of the MAIN PWB by hand.
(2) Withdraw the MAIN PWB backward.

(If necessary, take off the wire clamp and connectors, etc.)

3.1.3 REMOVING THE SPEAKER

• Remove the REAR COVER.

• Remove the MAIN PW BOARD.
(1) Raise the SPEAKER HOLDER claw [D] slightly, and

remove the SPEAKER HOLDER.

(2) Remove the SPEAKER.

3.1.4 CHECKING THE MAIN PW BOARD

• To check the back side of the MAIN PWB.
(1) Pull out the MAIN PWB. (Refer to REMOVING THE MAIN

PW BOARD).

(2) Erect the MAIN PWB vertically so that you can easily check

its back side.

CAUTIONS:

• Before turning on power, make sure that the CRT earth wire

and other connectors are properly connected.

• When repairing, connect the DEG. COIL to the DEG.

connector on the MAIN PWB.

3.1.5 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.YA392)1-5

FRONT CABINET

CRT SOCKET PWB

(Within MAIN PWB)

SPEAKER

SPEAKER HOLDER

D

REAR COVER

POWER CORD

MAIN PWB

C

1-6 (No.YA392)

B

A

Fig.1

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 from the
AC outlet.

2. Replace the memory IC

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

3. Power on

Connect the power plug to the AC outlet and switch on the
power.

4. System constant check and setting

• It must not adjust without adjustment signals.

(1) Press the [DISPLAY] key and the [PICTURE MODE]

key of the REMOTE CONTROL UNIT simultaneously.
(2) The SERVICE MENU screen of Fig. 1 will be displayed.
(3) While the SERVICE MENU is displayed, again press the

[DISPLAY] key and [PICTURE MODE] key

simultaneously, and the SYSTEM CONSTANT SET

screen of Fig. 2 will be displayed.
(4) Check the setting values of the SYSTEM CONSTANT

SETTING. If the value is different, select the setting item

with the [MENU /] key, and set the correct value with

the [MENU - / +] key.
(5) Press the [DISPLAY] key twice, and return to the normal

screen.

5. Receiving channel setting

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

6. User settings

Check the user setting items according to the given in page
later.
Where these do not agree, refer to the OPERATING
INSTRUCTIONS and set the items as described.

7. SERVICE MENU setting

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

SERVICE MENU

1.IF 2.V/C

3.DEF 4.VSM PRESET

5.PRESET

6.SETUP TOUR OFF

1-6 : SELECT DISP : EXIT

************ **.***
*** ** **** ***

Fig.1

SYSTEM CONSTANT- I

SYSTEM CONSTANT SET 1

COLOUR : MULTI
BILINGUAL : NO
TUNER : MU
ECO SENSOR
LANGUAGE : E/R/A/P

: SELECT

/

- / + : OPERATE DISP : EXIT

SYSTEM CONSTANT- II

SYSTEM CONSTANT SET 2

B/B SOUND : OFF
LOCK : 180
COLOUR AUTO
QSS
ALC : NO
TEXT RATE

: SEL - / + : OPE DISP : EXIT

/

SYSTEM CONSTANT- III

: NO

: NO
: MINT

: 20

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

POWER

SOUND

123

456

789

RETURN+

0

MENU

MENU

VOLUME

PICTURE

MODE

MUTING

PICTURE
MODE key

NUMBERS
key

-/--

MENU
/ key

DISPLAY key

MENU

- / + key

COLOUR

TV/VIDEO

OFF

TIMER

CHANNEL

SCAN

DISPLAY

CHANNEL

SYSTEM

SYSTEM CONSTANT SET 3

AMP TUNER : NO
VNR
TEXT TABLE : CYL
VOLUME PWM : POS

/

: SEL - / + : OPE DISP : EXIT

: YES

Fig.2

(No.YA392)1-7

3.2.2 SETTINGS OF FACTORY SHIPMENT

3.2.2.1 BUTTON OPERATION

Setting item Setting position

POWER Off

CHANNEL PR1

VOLUME 10

3.2.2.2 REMOTE CONTROL DIRECT OPERATION

Setting item Setting position

CHANNEL PR1

VOLUME 10

TV/VIDEO TV

PICTURE MODE BRIGHT

COLOUR SYSTEM PAL

SOUND SYSTEM B/G

3.2.2.3 REMOTE CONTROL MENU OPERATION

(1) MENU-1

Setting item Setting position

INPUT TV

ON TIMER PR1 0:00

VNR OFF

3.2.3 SYSTEM CONSTANT SETTING

Setting item Setting value

COLOUR MULTI

BILINGUAL NO

TUNER MU

ECO SENSOR NO

LANGUAGE E / R / A / P

B/B SOUND OFF

LOCK 180

COLOUR AUTO NO

QSS MINT

ALC NO

TEXT RATE 20

AMP TUNER NO

VNR YES

TEXT TABLE CYL

VOLUM PWM POS

(2) MENU-2

Setting item Setting position

AUTO SHUTOFF OFF

CHILD LOCK OFF

BLUE BACK OFF

(3) MENU-3

Setting item Setting position

SETUP TOUR ON

LANGUAGE ENGLISH

(4) MENU-4

Setting item

TINT 15 15 15

COLOUR

BRIGHT 15 15 15

CONT. 30 15 13

SHARP 151512

BRIGHT STANDARD SOFT

15 15 15

Setting position

1-8 (No.YA392)

3.2.4 SERVICE MENU SETTING ITEMS

Setting item Setting value Setting item Setting value

2. V/C 1.CUT OFF

2.DRIVE

3.BRIGHT

4.CONT.

5.COLOUR

6.TINT

7.SECAM BL ADJUST

8.SHARP [Do not adjust]

9.AMP T. SHARP [Do not adjust]

3. DEFLECTION 1. VER. POSITION

2. HOR. POSITION

3. VER. HEIGHT

4. VER. LINEARITY

5. VER. SCURVE

6. HOR. VCO ADJUST [Do not adjust]

4.VSM PRESET TINT
COLOUR
BRIGHT
CONT.
SHARP

5. PRESET

[Do not adjust]

Colour System 1. C-TRAP FIX

2. SHARP PEAK

3. ABL

4. GAMMA

5. Y. DELAY TIME

6. BLACK EXP START

7. C-BPF

8. CW / SCP

9. VIF DET LEVEL

11. IF AGC MIN

12. VIF AGC

13. VIF PMOD

19. VNR

20. RGB LIM

21. RGB LIMIT LEVEL

23. TEXT H. POSITION

24. READ DATA

Sound System 10. SIF DET LEVEL

14. SIF BPF BW ADJUST

15. SIF TRAP F0 ADJUST

16. SIF TRAP F0 ADJUST 2

17. SIF -TRAP

18. SIF -BPF

22. SIF SW

3.2.5 REPLACEMENT OF IC301 (IF V/C DECODER)

• For the IC301(IF V/C DECODER) of this model, all data are written in the micro-computer. So, write the data in the micro-

computer in accordance with the following procedures before starting adjustment.

 PROCEDURES

(1) Turn the POWER OFF.
(2) Replace the IC301 with a new one.
(3) While pressing [MENU] button and [VOL+] button ON the FRONT CABINET simultaneously, turn the POWER ON. When the

POWER is turned ON, the data is written in the micro-computer immediately.

 LOCATIONS OF FRONT PANEL BUTTONS

VOLUME + POWERMENU

(No.YA392)1-9

3.3 REPLACEMENT OF CHIP COMPONENT

3.3.1 CAUTIONS

(1) Avoid heating for more than 3 seconds.
(2) Do not rub the electrodes and the resist parts of the pattern.
(3) When removing a chip part, melt the solder adequately.
(4) Do not reuse a chip part after removing it.

3.3.2 SOLDERING IRON

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

3.3.3 REPLACEMENT STEPS

1. How to remove Chip parts

2. How to install Chip parts

[Resistors, capacitors, etc.]

(1) As shown in the figure, push the part with tweezers and

alternately melt the solder at each end.

(2) Shift with the tweezers and remove the chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

SOLDER

SOLDER

[Resistors, capacitors, etc.]

(1) Apply solder to the pattern as indicated in the figure.

(2) Grasp the chip part with tweezers and place it on the

solder. Then heat and melt the solder at both ends of the
chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the

solder.

(3) First solder lead A as indicated in the figure.

(2) As shown in the figure, push the part with tweezers and

alternately melt the solder at each lead. Shift and remove
the chip part.

NOTE :

After removing the part, remove remaining solder from the
pattern.

1-10 (No.YA392)

A

B

C

(4) Then solder leads B and C.

A

B

C

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 ADJUSTMENT

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

Item Preset value

PICTURE MODE BRIGHT

TINT / COLOUR / BRIGHT / CONT. / SHARP Centre

VNR OFF

BLUE BACK OFF

OFF TIMER OFF

AUTO SHUT OFF OFF

4.3 MEASURING INSTRUMENT AND FIXTURES

(1) DC voltmeter (or digital voltmeter)
(2) Oscilloscope
(3) Signal generator

(Pattern generator : PAL / SECAM / NTSC)

(4) Remote control unit

4.4 ADJUSTMENT ITEMS

 CHECK ITEM

• B1 VOLTAGE check

 TUNER / IF CIRCUIT

• IF VCO adjustment

• DELAY POINT adjustment

 FOCUS

• FOCUS adjustment

 DEFLECTION CIRCUIT

• V.HEIGHT / V.POSITION adjustment

• H. POSITION adjustment

• V.LINEARITY / V.S-CURVE adjustment

 VIDEO CIRCUIT

• WHITE BALANCE adjustment

• SUB BRIGHT adjustment

• SUB CONTRAST adjustment

• SUB COLOUR adjustment

• SUB TINT adjustment

• SECAM BALACK OFFSET adjustment

 VSM PRESET SETTING

• VSM PRESET setting

(No.YA392)1-11

4.5 ADJUSTMENT LOCATIONS

F901

TOP

CRT SOCKET PWB

TP-47G/R

T

IC701

(SOLDER SIDE)

U

TP-47B

TP-E

E1

CRT EARTH WIRE
(BRAIDED ASS'Y)

FRONT

IC702
MEMORY IC

PW

DEG

MAIN PWB

TU001

IC301

T

1Pin TP-91(B1)
2Pin NC
3Pin X-ray1
4Pin X-ray2

5Pin TP-E( )

S1

51

U

HV

HVT

UPPER:FOCUS
LOWER:SCREEN

1-12 (No.YA392)

4.6 BASIC OPERATION OF SERVICE MENU

4.6.1 TOOL OF SERVICE MENU OPERATION

Operate the SERVICE MENU with the REMOTE CONTROL UNIT.

4.6.2 SERVICE MENU ITEMS

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

1.IF Adjustment of the IF circuits.

2.V/C Adjustment of the VIDEO circuit.

3.DEF Adjustment of the DEFLECTION circuit.

4.VSM PRESET Adjustment of the initial setting values of VSM condition as STANDARD, SOFT and BRIGHT.

5.PRESET Adjustment of the RF circuit [Do not adjust].

6.SETUP TOUR It should be able to select mode (LANGUAGE and AUTO CH PRESET) [Should be OFF].

4.6.3 HOW TO ENTER THE SERVICE MENU

Press the [DISPLAY] key and the [PICTURE MODE] key of
the REMOTE CONTROL UNIT simultaneously. Then enter the

SERVICE MODE SELECT KEY

SERVICE MENU mode as shown in Fig.1.

POWER

SERVICE MENU

1.IF 2.V/C

3.DEF 4.VSM PRESET

5.PRESET

6.SETUP TOUR OFF

1-6 : SELECT DISP : EXIT

************ **.***
*** ** **** ***

Fig.1

4.6.4 HOW TO STORE THE SETTING VALUE

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

DISPLAY key

MENU

- / + key

SYSTEM

COLOUR

TV/VIDEO

OFF

TIMER

CHANNEL

SCAN

DISPLAY

CHANNEL

SOUND

RETURN+

MENU

MENU

PICTURE

123

456

789

0-/

MUTING

VOLUME

MODE

PICTURE
MODE key

NUMBERS
key

--

MENU
/ key

4.6.5 HOW TO EXIT THE SERVICE MENU

When complete the adjustment work, press the [DISPLAY]
key to return to the SERVICE MENU. And then press the

[DISPLAY] key again to return to the normal screen.

4.6.6 SELECTION OF SUB MENU SCREEN

Press one of [1] to [5] keys of the REMOTE CONTROL UNIT
and select the SUB MENU SCREEN form the SERVICE
MENU.

(No.YA392)1-13

4.6.7 METHOD OF SETTING

 1. IF

[1. VCO]

(1) [1] key Select 1. IF.

(2) [1] key Select 1. VCO.

(3) [MENU /] keys Select setting items.

(4) [MENU - / +] keys Adjust the values of the items.

(5) [DISPLAY] key As you press this key twice, you will return to the SERVICE MENU.

[2. DELAY POINT]

(1) [1] key Select 1. IF.

(2) [2] key Select 2. DELAY POINT.

(3) [MENU - / +] keys Set (adjust) the setting values of the setting items.

(4) [DISPLAY] key When this is pressed twice, you will return to the SERVICE MENU.

NOTE:

When the setting value has been changed, the new value will be stored in memory immediately.

 2. V/C, 3. DEF and 4. VSM PRESET

(1) [2] to [4] keys Select one from 2. V/C, 3. DEF and 4. VSM PRESET.

(2) [MENU /] keys Select setting items.

(3) [MENU - / +] keys Adjust the values of the items.

(4) [DISPLAY] key When this is pressed, you will return to the SERVICE MENU.

NOTE:

When the setting value has been changed, the new value will be stored in memory immediately.

 5. PRESET (Do not adjust)

 6. SETUP TOUR

(1) By pressing the [6] key, you can change the ON or OFF [should be OFF].

Should be OFF:

If it is ON, when you turn off the power and turn on a power again, the JVC’s logo will be shown
about 15 seconds automatically, and the SETUP TOUR starts.

(2) [MENU - / +] keys Select Language.

(3) [MENU ] key Auto Search.

1-14 (No.YA392)

4.6.8 SERVICE MENU FLOW CHART

************ **.***

SERVICE MENU

1. IF

SERVICE MENU

1.IF 2.V/C

3.DEF 4.VSM PRESET

5.PRESET

6.SETUP TOUR OFF

1-6 : SELECT DISP : EXIT

************ **.***

6. SETUP TOUR OFF

*** ** **** ***

ON / OFF

(By pressing [6] key)

IF

1. VCO

2. DELAY POINT

1-2 : SELECT DISP : EXIT

2. V/C

V/C PAL

1. CUTOFF
(G)
(B)

50Hz

/ : SELECT

- / + : OPERATE DISP : EXIT

(R)

* **
* **
* **

3. DEF

VCO (CW)

TOO HIGH
ABOVE REFERENCE
JUST REFERENCE
BELOW REFERENCE
TOO LOW
AFT ADJUST
VCO ADJUST
FINE

DISP : EXIT

DELAY POINT UHF

AGC TAKE-OVER

- / + : OPERATE DISP : EXIT

***.**

MHz

*** (**
*** (**

**

)
)

DEF AUTO

1. VER. POSITION

50Hz

/ : SELECT

- / + : OPERATE DISP : EXIT

**

4. VSM PRESET

BRIGHT

TINT

COLOUR
BRIGHT

CONT.
SHARP

/ : SELECT

- / + : OPERATE DISP : EXIT

**
**
**
**
**

5. PRESET

PRESET AUTO

1. C-TRAP FIX

*

50Hz B/G

/ : SELECT

- / + : OPERATE DISP : EXIT

(No.YA392)1-15

4.7 INITIAL SETTING VALUE OF SERVICE MENU

• Adjustment of the SERVICE MENU 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.

• Do not change the initial Setting Values of the Setting (Adjustment) items not listed in "ADJUSTMENT PROCEDURE".

[2. V/C]

Setting item Variable range

1.CUT OFF RED -128 - [phone]

GREEN -128 - [phone]

BLUE -128 - [phone]

2.DRIVE RED -128 - +127 +0 +0 +0 +0

BLUE -128 - +127 +0 +0 +0 +0

3.BRIGHT -128 - +127 +0 +0 +0 +0

4.CONT. -63 - +63+0+0+0+0

5.COLOUR -63 - +63 +0 +0 +0 0

6.TINT TV -63 - +63 --- --- +0 0

VIDEO -63 - +63 --- --- +0 0

7.SECAM BL ADJUST -31 - +31 +0 +0 +0 +0

8.SHARP
(Do not adjust)

9.AMP T. SHARP -31 - [phone]

[3. DEFLECTION]

1. VER. POSITION -4 - +3 +0 -3

2. HOR. POSITION -16 - +15 +1 +4

3. VER. HEIGHT -64 - +63 -20 -2

4. VER. LINEARITY -32 - +31 +15 +0

5. VER. SCURVE -32 - +31 -32 +0

6. HOR. VCO ADJUST

TV -31 - +31 -17 (Fixed) -17 (Fixed) -17 (Fixed) -17 (Fixed)

VIDEO -31 - +31 +10 (Fixed) +10 (Fixed) +10 (Fixed) +10 (Fixed)

Setting item Variable range

[Do not adjust]

-63 - +63 +0 +0

PAL SECAM NTSC 3.58 NTSC 4.43

Initial setting value

fv : 50Hz fv : 60Hz

Initial setting value

[4.VSM PRESET]

Setting item Variable range

TINT 0 - 30 15 15 15

COLOUR 0 - 30 15 15 15

BRIGHT 0 - 30 15 15 15

CONT. 0 - 30 30 15 13

SHARP 0 - 30 15 15 12

1-16 (No.YA392)

BRIGHT STANDARD SOFT

Initial setting value

[5. PRESET]

The items in the following table, it is no requirement for adjustment.If values had changed by the miss operation, set the
initial setting values in the following table.

z COLOUR SYSTEM (Do not adjust)

Setting item Variable range

1. C TRAP FIX 0 - 1 1 1 1 1

2. SHARP PEAK 0 - 1 0 0 0 0

3. ABL 0 - 11111

4. GAMMA 0 - 1 0 0 0 0

5. Y. DELAY TIME TV 0 - 3 0 2 2 3

VIDEO 0 - 30202

6. BLACK EXP START 0 - 3 3 3 3 3

7. C-BPFTV 0 - 11100

VIDEO 0 - 11111

8. CW / SCP 0 - 1 0 0 0 0

9. VIF DET LEVEL -63 - +63 +0 +0 +0 +0

11. IF AGC MIN 0 - 1 0 0 0 0

12. VIF AGC 0 - 1 0 0 0 0

13. VIF PMOD 0 - 1 0 0 0 0

19. VNR 0 - 63 15 15 15 15

20. RGB LIM 0 - 1 1 1 1 1

21. RGB LIMIT LEVEL 0 - 7 2 2 2 2

23. TEXT H. POSITION -16 - +15 -3 -3 -3 -3

24. READ DATA --- --- --- --- ---

PAL SECAM NTSC 3.58 NTSC 4.43

Initial setting value (Fixed value)

z SOUND SYSTEM (Do not adjust)

Setting item Variable range

10. SIF DET LEVEL -7 - +7 +0 +0 +0 +0

14. SIF BPF BW ADJUST -7 - +7 +0 +0 +0 +0

15. SIF TRAP FO ADJUST -7 - +7 +0 +0 +0 +0

16. SIF TRAP FO ADJUST 2 -7 - +7 +0 +0 +0 +0

17. SIF -TRAP 0 - 10000

18. SIF -BPF 0 - 10001

22. SIF SW 0 - 11110

B/G I D/K M

Initial setting value (Fixed value)

(No.YA392)1-17

4.8 ADJUSTMENT PROCEDURE

4.8.1 CHECK ITEM

Item

B1 VOLTAGE Signal

Measuring

instrument

generator

DC voltmeter

TP-B1 : 1-pin
TP-E : 5-pin
(S1 connector)
[MAIN PWB]

4.8.2 TUNER / IF CIRCUIT

Test point Adjustment part Description

(1) Receive a whole black signal.
(2) Connect a DC voltmeter to 1-pin and 5-pin of S1

connector.

(3) Make sure that the voltage is DC116.2V±2.0V.

Item

Measuring

instrument

IF VCO Signal

generator

Remote
control unit

VCO (CW)

TOO HIGH
ABOVE REFERENCE
JUST REFERENCE
BELOW REFERENCE
TOO LOW
AFT ADJUST
VCO ADJUST
FINE

DISP : EXIT

ADJUSTMENT AT THIS POINT
IS USELESS

***.**

Test point Adjustment part Description

[1. IF]

1. VCO

• Please use a signal generator which is frequency output
is correctly calibrated.
(1) Receive any broadcast.
(2) Select 1.IF from the SERVICE MENU.
(3) Select < 1.VCO >.
(4) Select VCO ADJUST with [MENU /] key.

MHz

(5) Press [MENU - / +] keys until the colour of the

characters TOO HIGH changes blue to yellow. Then
gradually press the [MENU - / +] keys until the TOO

YELLOW

LOW changes yellow. At this time, confirm that the
value of VCO ADJUST is near +00.

***(**
***(**

)
)

(6) Select AFT ADJUST with [MENU /] key.
(7) Press [MENU - / +] keys until the characters JUST

REFERENCE changes blue to yellow.

(8) Press the [DISPLAY] key three times to return to

normal screen.

TOO HIGH

ABOVE REFERENCE

JUST REFERENCE

BELOW REFERENCE

TOO LOW

ADJUSTMENT POINT

1-18 (No.YA392)

Item

DELAY POINT
(AGC)

Measuring
instrument

Test point Adjustment part Description

Signal
generator

Remote
control unit

DELAY POINT UHF

AGC TAKE-OVER **

- / + : OPERATE DISP : EXIT

[1. IF]

2. DELAY POINT
(AGC TAKE-OVER)

(1) Receive a black and white signal (colour off).
(2) Select 1. IF.
(3) Select < 2. DELAY POINT >.
(4) Set the setting values of the setting items as shown

bellow table.

(5) Then adjust the [MENU - / +] keys until video noise

disappears.

(6) Turn to other channels and make sure that there are

no irregularities.

Setting Item

DELAY POINT
(AGC TAKE-OVER)

NTSC3.58

OTHER

4.8.3 FOCUS

Item

Measuring
instrument

FOCUS Signal

generator

Variable range

0 - 127

Initial setting value

45

35

Test point Adjustment part Description

FOCUS VR
[In HVT]

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

make the vertical and horizontal lines as fine and
sharp as possible.

(3) Make sure that when the screen is darkened, the

lines remain in good focus.

(No.YA392)1-19