JVC AV27D104, AV27D304, AV27430, AV27432 Service Manual

52102200303

AV-27D104 AV-27D304

AV-27430 AV-27432

SERVICE MANUAL

COLOR TELEVISION

BASIC CHASSIS

AV-27D104/RA, AV-27D104/SA,
AV-27D304

AV-27430

AV-27432

AV-27D104
AV-27D304

/RA, AV-27D304/SA,
/RA, AV-27430/SA,

/RA, AV-27432/SA

AV-27430
AV-27432

FE2

TABLE OF CONTENTS

1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

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

3 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.

No.52102

2003/03

AV-27D104 AV-27D304
AV-27430 AV-27432

SPECIFICATION

Items

Dimensions (W x H x D) 75.2cm x 59.0cm x 53.1cm

(29-5/8” x 23-1/4” x 23”)
Mass 32.2kg (70.8 Ibs) 31.1kg (68.5 Ibs)
TV RF System CCIR(M)
Color Sound System NTSC, BTSC System (Multi Channel Sound)
TV Receiving Channels and Frequency

VL Band

VH Band

UHF Band

CATV Receiving Channels and Frequency

Low Band

High Band

Mid Band
Super Band
Hyper Band

Ultra Band

Sub Mid Band
TV/CATV Total Channel 180 Channels
Intermediate Frequency

Video IF Carrier

Sound IF Carrier
Color Sub Carrier 3.58MHz
Power Input 120V AC, 60Hz
Power Consumption 105W
Picture Tube 27” (68cm) Measured diagonally H: 55.4cm x V: 41.8cm
High Voltage 28kV±1.3kV (at zero beam current)
Speaker 5 x 9cm (2” x 3-1/2”) Oval type x 2
Audio Power Output 1.2W + 1.2W
Video / Audio Input (1 / 2 / 3)

Video (1 / 3)

Audio (1 / 2 / 3)

S-Video (Input 1)

Component (Input 2)

Audio Output (Variable) More then 0~1550mVrms (+4dBs)

Antenna terminal (VHF/UHF) F-type connector, 75ohm
Remote Control Unit RM-C1253G [AV-27D304]

02ch~06ch : 54MHz~88MHz
07ch~13ch : 174MHz~216MHz
14ch~69ch : 470MHz~806MHz

54MHz~804MHz
02~06, A-8 by 02~06&01
07~13 by 07~13
A~1 by 14~22
J~W by 23~36
W+1~W+28 by 37~64
W+29~W+84 by 65~125
A8, A4~A1 by 01, 96~99

45.75MHz

41.25MHz (4.5MHz)

1V(p-p), 75ohm (RCA pin jack x 2)
500mV(rms) (-4dBs), high impedance (RCA pin jack x 8)
Mini DIN 4pin x 1
Y : 1V(p-p) positive (negative sync provided, when terminated with 75ohm)
C : 0.286V(p-p) (burst signal when terminated with 75ohm)
RCA pin jack x 3
Y : 1V(p-p) positive (negative sync provided, when terminated with 75ohm)
Pb/Pr : 0.7V(p-p) 75ohm

Low impedance (400Hz when modulated 100%) (RCA pin jack)

RM-C1255G [AV-27D104]
(AA battery x 2 or Lithium cell battery x 1)

AV-27D104 / AV-27D304 AV-27430 / AV-27432

Contents

65.4cm x 59.3cm x 49.4cm
(25-3/4” x 23-3/8” x 19-1/2”)

RM-C203
(AA battery x 2 or Lithium cell battery x 1)

Design & specifications are subject to change without notice.

1-2 (No.52102)

SECTION 1

PRECAUTIONS

AV-27D104 AV-27D304

AV-27430 AV-27432

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. Replacem ent 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 pr oducts 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 that 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 schematic s 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 pa rts list of Service manual ma y cause
shock, fire, or other hazards.

(4) Use isolation transformer when hot chassis.

The chassis and any sub-chassis contained in some products ar e
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 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 I SOLATED (NEUTRAL )
side GND or EARTH side GND and never measure with a measuring
apparatus (oscilloscope etc.) the LIVE side GND and
ISOLATED(NEUTRAL) side GND or EARTH side GND at the same
time.
If above note will not be kept, a fuse or any parts will be broken.

(6) The high voltage applied to the picture tube m ust 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 con ditions 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 manufact urer of the
complete product.

(7) If any repair has been made to the ch assis, it is recomme nded that

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

(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 hig h
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, screwheads, earphone jack,
control shafts, etc.) to be sure the pro duct is saf e to operat e with out
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 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 A C ou tle t ( do not use
a line isolation transformer during this check.). Use an AC
voltmeter having 1000 ohms per volt or more sensitivity in
the following manner. Connect a 1500ohm 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 exce ed 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

GOOD EARTH GROUND

1500 10W

ON EACH EXPOSED
METAL PART

(11) High voltage hold down circuit ch eck.

After repair of the high voltage hold down circui t, this circuit shall b e
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.52102)1-3

AV-27D104 AV-27D304
AV-27430 AV-27432

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

Function AV-27D104 AV-27D304 AV-27430 AV-27432 Description

Tele-Text
(Closed-Caption)

Digital Comb Filter used used used used By the three-line digital comb filter, the refreshed image can be seen.
Video Status

(THEATER)
Video Status

(SPORTS)
GAME button

Component input
BBE
V-CHIP
Hyper-Surround
MTS Stereo
Return Plus

used used used used

used used - -

- - used used
used - used used
used used used used

-used- ­used used used used
used used - ­used used used used
used used used used

Title TELE-TEXT broadcast of C1~C4 and T1~T4 formula is receivable.

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

Expression of a favorite screen can be chosen by the VIDEO STATUS
function (STANDARD-DYNAMIC-SPORTS-GAME).

Sets automatically the proper conditions for playing video game (previously
connected in the front input).

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

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

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

Creates a deep, three-dimensional sound effect by channeling the audio
through the TV's front-firing speakers.

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

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

2.2 MAIN DIFFERENCE LIST

• The difference between AV-27D104/AV-27D304 series models and AV-27430/AV-27432 series models are mainly in the CABINET.

• The difference between RA models and SA models is in the PICTURE TUBE. As the result of the difference in PICTURE TUBE, the
MAIN PWB also differ.

• The difference between AV-27D104 series models and AV-27D304 series models are in the CABINET color.

• The difference between AV-27430 series models and AV-27432 series models are in the CABINET color.

Part name AV-27D104 /RA AV-27D104 /SA AV-27D304 /RA AV-27D304 /SA

MAIN PWB SFE-1026A-M2 SFE-1025A-M2 SFE-1022A-M2 SFE-1021A-M2
PICTURE TUBE (ITC) A68ADT25X01 A68QDN891X001 A68ADT25X01 A68QDN891X001
FRONT CABINET GQ10018-003A-A GQ10018-003A-A GQ10018-001B-A GQ10018-001B-A
REAR COVER GQ10017-001B-A GQ10017-001B-A GQ10017-001B-A GQ10017-001B-A
REMOTE CONTROL UNIT RM-C1255G-1H RM-C1255G-1H RM-C1253G-1H RM-C1253G-1H

Part name AV-27430 /RA AV-27430 /SA AV-27432 /RA AV-27432 /SA

MAIN PWB SFE-1028A-M2 SFE-1027A-M2 SFE-1030A-M2 SFE-1029A-M2
PICTURE TUBE (ITC) A68ADT25X01 A68QDN891X001 A68ADT25X01 A68QDN891X001
FRONT CABINET LC10081-004B-A LC10081-004B-A LC10081-008A-A LC10081-008A-A
REAR COVER LC10082-005A-A LC10082-005A-A LC10082-003A-A LC10082-003A-A
REMOTE CONTROL UNIT RM-C203-1C RM-C203-1C RM-C1255G-1H RM-C1255G-1H

2.3 HOW TO IDENTIFY MODELS

How to recognize from the appearance of the model concerned
is written right figure. Please distinguish from several contents on

Indicated model name

the printing label.

1-4 (No.52102)

Indicated RA or SA models

2.4 FUNCTIONS

[FRONT PANEL]

<AV-27D104 / AV-27D304>

AV-27D104 AV-27D304

AV-27430 AV-27432

<AV-27430 / AV-27432>

MENU CHANNEL

[REAR PANEL]

<AV-27D104 / AV-27D304>

MENU POWER

CHANNEL

VOLUME

VOLUME

POWER

<AV-27430 / AV-27432>

[REMOTE CONTROL UNIT]

AV-27D104 (RM-C1255G) AV-27D304 (RM-C1253G)

AV-27430 / AV-27432 (RM-C203)

(No.52102)1-5

AV-27D104 AV-27D304
AV-27430 AV-27432

2.5 DISASSEMBLY PROCEDURE

2.5.1 REMOVING THE REAR COVER

[AV-27D104 / AV-27D304]

(1) Unplug the power plug.
(2) Remove the 11 screws [A] (Fig.1).
(3) Remove the 4 screws [B] (Fig.1).
(4) Then remove the REAR COVER toward you.

2.5.2 REMOVING THE REAR COVER

[AV-27430 / AV-27432]

(1) Unplug the power plug.
(2) Remove the 7 screws [A] (Fig.2).
(3) Remove the 4 screws [B] (Fig.2).
(4) Then remove the REAR COVER toward you.

2.5.3 REMOVING THE MAIN PWB

• Remove the REAR COVER.
(1) Raise this side 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.)

2.5.4 REMOVING THE SPEAKER

[AV-27D104 / AV-27D304]

• Remove the REAR COVER.
(1) Remove the 4 screws [D], then remove the speaker

(Fig.1).

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

speaker.

2.5.6 CHECKING THE PW BOARD

(1) Pull out the MAIN PWB (refer to REMOVING THE MAIN

PWB).

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

the backside 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 PW board.

2.5.7 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.

2.5.5 REMOVING THE SPEAKER
[AV-27430 / AV-27432]

• Remove the REAR COVER.

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

(Fig.2).

(2) 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.

1-6 (No.52102)

[AV-27D104 / AV-27D304]

FRONT CABINET

AV-27D104 AV-27D304

AV-27430 AV-27432

CRT

SPEAKER

D

CRT SOCKET PWB
(Within MAIN PWB)

HVT

SPEAKER

REAR COVER

D

(PWB STOPPER)

TUNER

MAIN PWB

C

POWER CORD

Fig.1

B

A

(No.52102)1-7

AV-27D104 AV-27D304
AV-27430 AV-27432

[AV-27430/ AV-27432]

FRONT CABINET

CRT

CRT SOCKET PWB
(Within MAIN PWB)

SPEAKER

REAR COVER

D

MAIN PWB

HVT

TUNER

D

(PWB STOPPER)

C

1-8 (No.52102)

POWER CORD

B

A

Fig.2

2.6 MEMORY IC REPLACEMENT

2.6.1 MEMORY IC

This TV use memory IC.
In the memory IC, there are memorized data for correctly operating the video and deflection circuits.
When replacing the memory IC, be sure to use IC written with the initial values of data.

2.6.2 PROCEDURE FOR REPLACING MEMORY IC
(1) Power off

Switch the power off and unplug the power cord from the out-

SERVICE MENU

let.

(2) Replace IC

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

(3) Power on

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

(4) Setting of receive channels

1.V/C(S)

3.SOUND(A)

7.LOW LIGHT

9.VCO

11.I2C BUS

Set the receive channels. For setting, refer to the OPERATING
INSTRUCTIONS.

(5) User settings

SELECT BY
OPERATE BY

Check the user setting items according to “USER SETTING
VALUES”, and if these are different, set the correct value.

(6) SERVICE MENU setting

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

DISPLAY

SLEEP
TIMER

2.DEF(D)

4.OTHERS(F)

8.HIGH LIGHT

EXIT BY

AV-27D104 AV-27D304

AV-27430 AV-27432

EXIT

VIDEO

STATUS

VOLUME

- / +

NOTE:

Although this illustration of remote control unit is
written about RM-C12543G(AV-27D304), it can use for
operating the other model of remote control unit as
same key assignment.

CHANNEL

- / +

EXIT

(No.52102)1-9

AV-27D104 AV-27D304
AV-27430 AV-27432

2.6.3 USER SETTING VALUES

Setting item Setting value Setting item Setting value

REMOTE CONTROL UNIT KEY

POWER OFF VIDEO STATUS DYNAMIC
CHANNEL CH-02 HYPER SURROUND OFF [AV-27D104]
VOLUME 15 THEATER PRO OFF [AV-27D304]
TV/VIDEO TV GAME OFF [Except AV-27D304]
DISPLAY OFF

SETTING OF MENU

PICTURE MODE INITIAL SETUP MODE

TINT Center LANGUAGE ENG
COLOR Center FRONT PANELLOCK OFF
PICTURE +8 V2 COMPONENT-IN NO
BRIGHT Center AUTO SHUT OFF OFF
DETAIL +10 CLOSED CAPTION OFF
NOISE MUTING ON AUTO TUNER SET UP AIR

SOUND MODE CHANNEL SUMMARY Unnecessary to set
BASS Center V-CHIP OFF
TREBLE Center SET LOCK CODE (0000) Unnecessary to set
BALANCE Center XDS ID ON
MTS STEREO
HYPER SURROUND OFF [Except AV-27D104]

CLOCK / TIMERS MODE

SET CLOCK Manual

TIME ZONE PACIFIC

D.S.T. OFF

ON / OFF TIMER OFF

1-10 (No.52102)

2.7 REPLACEMENT OF CHIP COMPONENT

2.7.1 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.

2.7.2 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.

2.7.3 REPLACEMENT STEPS

1. How to remove Chip parts
[Resistors, capacitors, etc.]

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

alternately melt the solder at each end.

AV-27D104 AV-27D304

AV-27430 AV-27432

2. How to install Chip parts
[Resistors, capacitors, etc.]

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

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

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

SOLDER

SOLDER

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

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

(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.

A

B

C

(4) Then solder leads B and C.

Note :

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

A

B

C

(No.52102)1-11

AV-27D104 AV-27D304
AV-27430 AV-27432

SECTION 3

ADJUSTMENT

3.1 ADJUSTMENT PREPARATION

(1) There are 2 ways of adjusting this TV : One is with the REMOTE CONTROL UNIT and the other i s 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 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

PICTURE MODE (VSM) DYNAMIC
BASS / TREBLE / BALANCE Center
HYPER SURROUND OFF
TINT / COLOR / PICTURE / BRIGHT / DETAIL Center
MTS STEREO

3.2 MEASURING INSTRUMENT AND FIXTURES

(1) DC voltmeter (or digital voltmeter)
(2) Oscilloscope
(3) Signal generator (Pattern generator) [NTSC]
(4) TV audio multiplex signal generator
(5) Remote control unit

1-12 (No.52102)

3.3 ADJUSTMENT LOCATIONS

AV-27D104 AV-27D304

AV-27430 AV-27432

FRONT

MAIN PWB

POWER

CRT SOCKET PWB

(Within MAIN PWB ASS'Y)

T

TP-E

(SOLDER SIDE)

VOL+ VOL- CH+ CH- MENU

TP-B

E1

TOP

CRT EARTH

(BRAIDED ASS'Y)

POWER

S

MEMORY

IC702

F901

IC201

T111

HV

IC421

IC101

S401

TUNER

HVT

IC901

U

X

B1

AV IN / OUT

UPPER : FOCUS
LOWER : SCREEN

(No.52102)1-13

AV-27D104 AV-27D304
AV-27430 AV-27432

3.4 BASIC OPERATION OF SERVICE MENU

3.4.1 TOOL OF SERVICE MENU OPERATION

Operate the SERVICE MENU with the REMOTE CONTROL UNIT.

3.4.2 SERVICE MENU ITEMS

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

(1) V/C (S) This mode adjusts the VIDEO and CHROMA control circuit.
(2) DEF (D) This mode adjusts the DEFLECTION control circuit.
(3) SOUND (A) This mode adjusts the SOUND control circuit.
(4) OTHERS (F) This mode adjusts the display setting and the other settings (Do not change the values).
(7) LOW LIGHT This mode adjusts the WHITE BALANCE (LOW LIGHT) control circuit.
(8) HIGH LIGHT This mode adjusts the WHITE BALANCE (HIGH LIGHT) control circuit.
(9) VCO This mode adjusts the VCO control circuit.
(11) I2C BUS This mode adjusts the I2C BUS control circuit (They are fixed).

3.4.3 BASIC OPERATION IN SERVICE MENU

3.4.3.1 HOW TO ENTER THE SERVICE MENU

(1) Press the [SLEEP TIMER] key and set the SLEEP TIMER

"0 MIN".

for

Then press the [DISPLAY] key and [VIDEO STATUS] key

of the remote control unit at the same time to enter the

SERVICE MENU screen.

S ERVI CE M ENU

1.V/C(S)

3.SOUND(A)

7.L OW LIGHT

2.DEF(D)

4.OTHERS(F)

8.HIGH LIGHT

9.VCO

11.I2C BUS

3.4.3.2 SUB MENU SCREEN SELECTION

Press [VOLUME (-/+)] keys of the REMOTE CONTROL UNIT,
and select the SUB MENU SCREEN from SERVICE MENU.
In SERVICE MENU, press the [CHANNEL (-/+)] key to select any
of the SUB MENU items. The letters of the selected items are
displayed in yellow.

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

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

7.LOW LIGHT 8.HIGH LIGHT

9.VCO

2

C BUS

11.I

SELECT BY
OPERATE BY

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

DISPLAY

SLEEP

TIMER

VIDEO
STATUS

VOLUME

- / +

NOTE:

Although this illustration of remote control unit is
written about RM-C12543G(AV-27D304), it can use for
operating the other model of remote control unit as
same key assignment.

EXIT BY

EXIT

CHANNEL

+ / -

EXIT

1-14 (No.52102)

3.4.3.3 SETTING METHOD
[1.V/C(S) ADJUSTMENT MODE]

For example, adjust the 1.V/C(S) by using the REMOTE CONTROL UNIT.

1) Press the [CHANNEL (-/+)] keys to select the one of setting item from S01 BRIGHT to S21 AGC ADJ.

2) 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 from 1.V/C(S) to 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.

3.4.3.4 Release of SERVICE MENU

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

3.4.4 SERVICE MENU FLOW CHART

SERVICE MENU (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.I2C BUS

ً

SELECT BY
OPERATE BY EXIT BY

ً

ً

ً

EXIT

AV-27D104 AV-27D304

AV-27430 AV-27432

1.V/C(S)

RF 4 : 3 STD LOW

S01 BRIGHT

***

2.DEF(D)

RF 4 : 3 STD LOW

D01 V FREQ

3.SOUND(A)

A01 IN LEVEL

***

7.LOW LIGHT

BRIGHT

***

ً

***

ً

***

8.HIGH LIGHT

******

9.VCO

TOO HIGH GOOD TOO LOW

SYNC: YES
AFC ON
FINE 0

Do not adjust

4.OTHERS(F)

F01 OSD POSI

11.I2C BUS

Do not adjust

***

I2C BUS ON

(No.52102)1-15

AV-27D104 AV-27D304
AV-27430 AV-27432

3.5 INITIAL SETTING VALUE OF SERVICE MENU

(1) Adjustment of the service menu is made on the basis of the initial setting values. however, 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.

3.5.1 [1.V / C]
Initial setting value

No. Setting item Variable range

S01 BRIGHT 0~127 64 --- --- --- --- --­S02 PICTURE 0~127 65 --- --- --- --- --­S03 COLOR 0~127 45 --- --- --- 46 --­S04 TINT 0~127 60 --- --- --- 63 --­S05 DETAIL 0~63 35 --- 40 --- 40 --­S06 BRIGHT +- -128~+127 --- 0 1 --- +1 --­S07 PICT+- -128~+127 --- -15 0 --- 0 --­S08 COLOR +- -128~+127 --- -3 1 --- --- --­S09 TINT+- -128~+127 --- -6 -3 --- --- --­S10 DETAIL+- -128~+127 --- +3 --- --- --- ---

RF / EXT (SV,CV) EXTERNAL (SV,CV) COMPONENT

STANDARD THEATER STANDARD THEATER STANDARD THEATER

[AV-27D104,AV-27D304]

Initial setting value

No. Setting item Variable range

S11 R CUT OFF 0~255 30 --- --- --- --- --- --- --­S12 G CUT OFF 0~255 30 --- --- --- --- --- --- --­S13 B CUT OFF 0~255 30 --- --- --- --- --- --- --­S14 R DRIVE 0~127 64 --- --- --- --- --- --- --­S15 B DRIVE 0~127 64 --- --- --- --- --- --- --­S16 R CUT+- -128~+127 --- 0 0 0 -10 --- --- --­S17G CUT+- -128~+127---0000--------­S18 B CUT+- -128~+127 --- 0 0 0 -10 --- --- --­S19 R DRV+- -128~+127 --- +5 +13 +7 0 --- --- --­S20 B DRV+- -128~+127 --- +6 -25 -9 0 --- --- ---

[AV-27430,AV-27432]

No. Setting item Variable range

S11 R CUT OFF 0~255 30 --- --- --- --- --- --- --­S12 G CUT OFF 0~255 30 --- --- --- --- --- --- --­S13 B CUT OFF 0~255 30 --- --- --- --- --- --- --­S14 R DRIVE 0~127 64 --- --- --- --- --- --- --­S15 B DRIVE 0~127 64 --- --- --- --- --- --- --­S16R CUT+- -128~+127---0000--------­S17G CUT+- -128~+127---0000--------­S18B CUT+- -128~+127---0000--------­S19 R DRV+- -128~+127 --- 0 +7 +7 0 --- --- --­S20 B DRV+- -128~+127 --- 0 -9 -9 0 --- --- ---

STANDARD THEATER STANDARD THEATER

LOW HIGH LOW HIGH LOW HIGH LOW HIGH

STANDARD THEATER STANDARD THEATER

LOW HIGH LOW HIGH LOW HIGH LOW HIGH

RF/EXT (SV,CV) COMPONENT

Initial setting value

RF/EXT (SV,CV) COMPONENT

No. Setting item Variable range Initial setting value

S21 AGC ADJUST 0~127 80

1-16 (No.52102)

3.5.2 [2.DEF]

No. Setting item Variable range

D01 AFC GAIN 0~3 0 2
D02 H POSI 0~31 9 (/SA model) / 10 (/RA model) 9 (/SA model) / 10(/RA model)
D03 V SIZE 0~125 65 65
D04 V S CORR 0~15 0 0
D05 V LIN 0~15 8 8
D06 H SIZ E 0~63 32 32
D07 WVMT TOP 0~3 0 0
D08 WVMT BTM 0~3 0 0
D09 EWCR TOP 0~31 16 16
D10 EWCR BTM 0~31 16 16
D11 EW PARA 0~63 26 26
D12 BLANK SW 0~1 0 0

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

A01 IN LEVEL 0~63 36
A02 FH MON 0~1 0
A03 ST VCO 0~63 43
A04 PIL CAN 0~1 0
A05 FILTER 0~63 35
A06 LOW SEP 0~63 8
A07 HI SEP 0~63 26
A08 5FH MON 0~1 0
A09 SAP VCO 0~63 44

Initial setting value

RF EXTERNAL (SV, CV)

AV-27D104 AV-27D304

AV-27430 AV-27432

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

F01 OSD POSI 0~255 22
F02 OSD PREQ 0~255 83
F03 CCD POSI 0~63 42
F04 CCD FREQ 0~255 93
F05 CCD CONT 0~63 11
F06 PUR CONT 0~255 62
F07 VNR CHK 0~255 3
F08 VCSN TM 0~255 5
F09 CCD PCHK 0~1 1

3.5.5 [7.LOW LIGHT]
No. Setting item Variable range Initial setting value

1RED 0~255 30
2 GREEN 0~255 30
3 BLUE 0~255 30

3.5.6 [8.HIGH LIGHT]
No. Setting item Variable range Initial setting value

1RED 0~255 64
2 BLUE 0~255 64

(No.52102)1-17

AV-27D104 AV-27D304
AV-27430 AV-27432

3.6 ADJUSTMENT PROCEDURE

3.6.1 CHECK ITEM

Item

B1 POWER

Measuring

instrument

DC voltmeter

SUPPLY

Signal
generator

3.6.2 VCO

Item

Measuring

instrument

IF VCO Remote

control unit

Test point Adjustment part Description

B1 Connector
1-pin : TP-91
3-pin : TP-E
[MAIN PWB]

Test point Adjustment part Description

[9.VCO]
CW transf. (T111)

[MAIN PWB]

TOO HIGH GOOD TOO LOW

SYNC: YES
AFC ON
FINE 0

(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.

• It must not adjust without inputting the RF signal.
(1) Receive a broadcast.
(2) Select 9.VCO mode from the SERVICE MENU.
(3) Change 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" letters turns green.

And then confirm that the [SYNC] is YES again.

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

3.6.3 RF AGC

Item

Measuring

instrument

RF AGC Signal

generator
Remote

control unit

No.

Setting item

S21

AGC ADJ 0㨪127

3.6.4 ADJUSTMENT OF FOCUS

Item

Measuring

instrument

FOCUS Signal

generator

Test point Adjustment part Description

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

(1) Receive a black-and-white signal (colour off).
(2) Select <S21>(AGC ADJ) of the 1.V/C(S).
(3) Press the [MUTING] key and turn the picture color

off.
(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

when noise disappears from the screen (at that time,

Variable

range

Initial setting

value

80

not to increase the value too much).
(6) Change to other channels and make sure that there

is no irregularity.
(7) Press the [MUTING] key and get color out.

Test point Adjustment part Description

FOCUS VR
[In HVT]

(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.

1-18 (No.52102)

3.6.5 DEFLECTION CIRCUIT

Item

V. SIZE &
V. CENTER

Measuring

instrument

Signal
generator

Remote
control unit

Test point Adjustment part Description

[2.DEF(D)]
D03 : V SIZE

(1) Receive the crosshatch signal.
(2) Select the <D03>(V SIZE).

(3) Adjust the <D03> so that the vertical screen size
V. CENTER SW(S401)
[MAIN PWB]

becomes the value given below.

(4) Adjust the V. CENTER SW to agree the vertical

center with display center.

AV-27D104 AV-27D304

AV-27430 AV-27432

Screen

size

Model name Vertical screen size

RA model

SA model

No.

D03

Setting item

V SIZE 0㨪125

H. CENTER Signal

generator
Remote

control unit

Variable

range

90.0%

89.0%

Initial setting

[2.DEF(D)]
D02 : H POSI

Picture

size

(100%)

value

40

(1) Receive the crosshatch signal.

(2) Select <D02>(H POSI).

(3) Adjust the <D02> so that left width and right width of

the crosshatch screen becomes equal.

Model name

RA model

No.

D02

D02SA model H POSI 0㨪31 9

Setting item

H POSI 0㨪31

Variable

range

Initial setting

value

10

(No.52102)1-19

AV-27D104 AV-27D304
AV-27430 AV-27432

3.6.6 VIDEO CIRCUIT

Item

WHITE
BALANCE
(LOW LIGHT)

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

Measuring

instrument

Signal
generator

Remote
control unit

H LINE ON

Test point Adjustment part Description

[7.LOW LIGHT]

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

(2) Select the 7.LOW LIGHT in the SERVICE MENU.
[1.V/C(S)]
S11 : R CUTOFF
S12 : G CUTOFF
S13 : B CUTOFF
S01 : BRIGHT

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

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

(4) Display a single horizontal line by pressing the [1]

key.

(5) Turn the SCREEN VR all the way to the left.
SCREEN VR
[in HVT]

(6) Turn the SCREEN VR gradually to the right from the

left until either one of the red, blue or green color
appears faintly.

(7) Adjust the two colors which did not appear until the

single horizontal line that is displayed becomes
white using the [4] to [9] keys.

R CUTOFF

H LINE OFF

G CUTOFF

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

is displayed faintly.

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

mode.

EXIT
B CUTOFF

B CUTOFF

(10) Adjust the <S01> level to become the black

component shines white slightly by [VOLUME] key.

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

is visible to the black component, which shines white
slightly.

G CUTOFF

R CUTOFF

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

other than a visible color is adjusted, and it is made
to look white.

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

No.

S11

S12 G CUT OFF 0㨪255 30

S13 B CUT OFF 0㨪255 30

S01 BRIGHT 0㨪127 64

Setting item

R CUT OFF 0㨪255

Variable

range

Initial setting

value

30

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

1-20 (No.52102)

AV-27D104 AV-27D304

AV-27430 AV-27432

Item

WHITE
BALANCE
(HIGH LIGHT)

Measuring

instrument

Signal
generator

Test point Adjustment part Description

[8.HIGH LIGHT]
S14 : R DRIVE

S15 : B DRIVE
Remote
control unit

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

R DRIVE

EXIT
B DRIVE

B DRIVE

R DRIVE

(1) Receive the black-and-white signal (color off).
(2) Select the 8.HIGH LIGHT in the SERVICE MENU.
(3) Set the initial setting value of <S14>(R DRIVE) and

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

(4) Adjust the screen until it becomes white using the

[4], [6], [7] and [9] keys of the remote control unit.
The [3] EXIT key is the cancel key for the 8.HIGH

LIGHT mode.

No.

S14

S15 G DRIVE 0㨪127 64

Setting item

R DRIVE 0㨪127

SUB BRIGHT Remote

control unit

No.

S01

SUB
CONTRAST

No.

S02

Setting item

BRIGHT 0㨪127

Remote
control unit

Setting item

PICTURE 0㨪127 65

Variable

range

Variable

range

Variable

range

Initial setting

value

64

[1.V/C(S)]

S01 : BRIGHT

Initial setting

value

64

[1.V/C(S)]

S02 : PICTURE

Initial setting

value

(1) Receive the broadcast.
(2) Select <S01>(BRIGHT) of the 1.V/C(S).
(3) Set the initial setting value of the <S01> with the

[VOLUME (-/+)] key.

(4) If the brightness is not the best with the initial setting

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

(1) Receive the broadcast.
(2) Select <S02>(PICTURE) of the 1.V/C(S).
(3) Set the initial setting value of the <S02> with the

[VOLUME (-/+)] key.

(4) If the contrast is not the best with the initial setting

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

(No.52102)1-21

AV-27D104 AV-27D304
AV-27430 AV-27432

Item

Measuring

instrument

SUB COLOR Signal

generator
Oscilloscope
Remote

control unit

No.

Setting item

W

Test point Adjustment part Description

TP-B
TP-E
[CRT SOCKET
PWB]

Y

G

C

M

R

B

Variable

range

[1.V/C(S)]
S03 : COLOR

(A)

(-)
0V

(+)

Initial setting

value

[ Method of adjustment without measuring instrument ]

(1) Receive the broadcast.
(2) Select <S03>(COLOR) of the 1.V/C(S).
(3) Set the initial setting value of the <S03> with the

[VOLUME (-/+)] key.

(4) If the color is not the best with the Initial setting

value, make fine adjustment of the <S03> until you
get the optimum color.

[ Method of adjustment using measuring instrument ]

(1) Receive the full field color bar signal (75% white).
(2) Select <S03>(COLOR) of the 1.V/C(S).
(3) Set the initial setting value of the <S03> with the

[VOLUME (-/+)] key.
(4) Connect the oscilloscope between TP-B and TP-E.
(5) Adjust <S03> and bring the value of (A) in the

illustration to the voltage given in the below table.

S03

Models

RA model
SA model

COLOR 0㨪127 64

W-B

Adjustment Voltage

+17V
+15V

1-22 (No.52102)

AV-27D104 AV-27D304

AV-27430 AV-27432

Item

Measuring

instrument

SUB TINT Signal

generator
Oscilloscope
Remote

control unit

No.

Setting item

W

Test point Adjustment part Description

TP-B
TP-E
[CRT SOCKET
PWB]

Y

G

C

M

R

B

Variable

range

[1.V/C(S)]
S04 : TINT

(B)

(-)

0V

(+)

Initial setting

value

[ Method of adjustment without measuring instrument ]

(1) Receive the broadcast.
(2) Select <S04>(TINT) of the 1.V/C.
(3) Set the initial setting value of the <S04> with the

[VOLUME (-/+)] key.

(4) If the tint is not the best with the initial setting value,

make fine adjustment of the <S04> until you get the
optimum tint.

[ Method of adjustment using measuring instrument ]

(1) Receive the full field color bar signal (75% white).
(2) Select <S04>(TINT) of the 1.V/C.
(3) Set the initial setting value of the <S04> with the

[VOLUME (-/+)] key.
(4) Connect the oscilloscope between TP-B and TP-E.
(5) Adjust <S04> and bring the value of (B) in the

illustration to the voltage given in the below table.

S04

Models

RA model
SA model

TINT 0㨪127 64

W-B

Adjustment Voltage

+20V
+25V

(No.52102)1-23

AV-27D104 AV-27D304
AV-27430 AV-27432

3.6.7 MTS CIRCUIT

Item

MTS INPUT
LEVEL

Measuring

instrument

Remote
control unit

Test point Adjustment part Description

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

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

No.

A01

MTS
SEPARATION

1 cycle

Setting item

IN LEVEL 0㨪63 036

TV audio
multiplex
signal

Variable

range

R OUT
L OUT
[AUDIO OUT]

generator
Oscilloscope
Remote

control unit

L-Channel
signal waveform

Minimum

Initial setting

value

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

R-Channel
crosstalk portion

(1) Input the stereo L signal (300Hz) from the 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 <A06>(LOW SEP) of the SOUND MODE.
(4) Set the initial setting value of the <A06> with the

[VOLUME (-/+)] key.
(5) Adjust the <A06> so that the stroke element of the

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

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

<A07>(HI SEP).

No.

A06

A07 HI SEP 0㨪63 026

Setting item

LOW SEP 0㨪63 008

Variable

range

Initial setting

value

1-24 (No.52102)

3.6.8 HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT

3.6.8.1 HIGH VOLTAGE HOLD DOWN CIRCUIT

After repairing the high voltage hold down circuit.
This circuit shall be checked to operate correctly.

3.6.8.2 CHECKING OF THE HIGH VOLTAGE HOLD DOWN CIRCUIT

(1) Turn the power switch to on.
(2) Refer to the following figure, set the resistor between X connector 1 and 3 .
(3) Make sure that the screen picture disappears.
(4) Temporarily unplug the power plug.
(5) Remove the resistor replaced X connector 1 and 3 .
(6) Again plug the power plug, make sure that the normal picture is displayed on the screen.

RESISTOR

18.00 kǡr1%

AV-27D104 AV-27D304

AV-27430 AV-27432

POWER
ON OFF

CONNECTOR

X3 2 1

HEATER

T521

4

(No.52102)1-25

AV-27D104 AV-27D304
AV-27430 AV-27432

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.52102)

Printed in Japan

200303WPC