JVC AV-27D202/R, AV-27D202/S, AV-27D302/R, AV-27D302/S Service Manual

A

A

SERVICE MANUAL

COLOR TELEVISION

AV-27D302

/S

V-27D302
V-27D202

BASIC CHASSIS

FD

AV-27D302
AV-27D202
AV-27D202

/R
/S
/R

CONTENTS

!

SPECIFICATIONS

!

SAFETY PRECAUTIONS

!

FEATURES

!

MAIN DIFFERENCE LIST

!

HOW TO IDENTIFY MODELS

!

FUNCTIONS

!

SPECIFIC SERVICE INSTRUCTIONS

!

SERVICE ADJUSTM ENTS

!

PARTS LIST

★

OPERATING INSTRUCTIONS

★

STANDARD CIRCUIT DIAGRAM

1

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････････････････････････････････ ･････････････････････

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COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

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29

No.51788

Mar. 2001

Mar. 2001

A

V-27D302

A

V-27D202

SPECIFICATIONS

Items

Dimensions (W
Mass

Reception Format
Reception Range

VHF, UHF

CATV

TV/CATV Total Channel

Intermediate Frequency

Color Sub Carrier
Power Input
Power Consumption

D)

××××H××××

UHF Band

Low Band

High Band

Super Band
Hyper Band

Ultra Band

Sub Mid Band

Video IF Carrier

Sound IF Carrier

VL Band

VH Band

Mid Band

29-5/8”×23-1/4”×23” / 752mm×590mm×531mm

70.8 Ibs / 32.2 kg
NTSC, BTSC System (Multi-Channel Sound)

(02～06) 54MHz～88MHz
(07～13) 174MHz～216MHz
(14～69) 470MHz～806MHz

(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)
181 Channels

45.75MHz

41.25MHz (4.5MHz)

3.58MHz
120V AC, 60Hz
113W

AV-27D302/S
AV-27D302/R

Contents

AV-27D202/S
AV-27D202/R

(54MHz～804MHz)

Picture Tube
High Voltage

Speaker
Audio Power Output

Input terminal

Input 1 S-Video

Video(V)

Audio(L, R)

Input 2 Component Video

Video / Y, Pb, Pr

Audio(L, R)

Output terminal

Variable Audio Output (R/L)

Antenna terminal

Remote Control Unit

27” (68cm) Measured Diagonally
29kV±1kV (at zero beam current)

2“×3-1/2” / 5×9cm Oval type×2

1.2W + 1.2W
Built in BBE sound function

Y: 1Vp-p Positive (negative sync provided, when terminated with 75Ω)
C: 0.286V
1Vp-p, 75Ω (RCA pin jack)
500mVrms ( -4dBs ), High Impedance (RCA pin jack)

1Vp-p 75Ω(positive sync)
50mVrms (-4dBs), High Impedance (RCA pin jack)

More than 0～1550mVrms (+6dBs)
Low impedance (400Hz when modulated 100%) (RCA pin jack)

75Ω(VHF/UHF) Terminal, F-Type Connector

RM-C303G-1A
(AA/R6/UM-3 battery×2)

p-p

(burst signal, when terminated with 75Ω)

Design & specifications are subject to change without notice.

2

No.51788

A

A

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 c an 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 (
in Service manual.

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

4.

Use isolation transformer when hot chassis.

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

5.

Don't short between the LIVE side ground and ISOLATED
(NEUTRAL) side ground or EARTH side ground when
repairing.

Some model's power circuit is partly diff erent 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 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. 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).

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, crack ed or melted high voltage harness,
poor soldering, etc.). To maintain the proper minimum level of
soft X-Ray emission, components in the high voltage circuitry
including the picture tube must be the exact replacements or
alternatives approved by the manufacturer of the complete
product.

8. Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM. Discharge
the picture tube before attempting meter connection, by
connecting a clip lead to the ground frame and connecting the
other end of the lead through a 10kΩ 2W resistor to the anode
button.

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

The use of a substitute replacement which

) on the parts list

!!!!

V-27D302
V-27D202

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 product is safe to operate without
danger of electrical shock.

(1)

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.

(2)

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 c urrent 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 1000 ohms per volt or more sensitivi ty 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 t o each exposed metal
part, particularly any exposed metal part having a return path to
the chassis, and measure the AC voltage across the res istor.
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

GOOD
EARTH
GROUND

11.

High voltage hold down circuit check.

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

circuit

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

0.15μF AC-TYPE

Ω

10W

1500

How to check the high voltage hold down

".

OR MORE SENSITIVITY)

PLACE THIS PROBE
ON EACH EXPOSED
METAL PART

Ω

/V,

A V

No. 51788

3

A

V-27D302

A

V-27D202

FEATURES

New chassis design enables use of a single board with

"

simplified c i rcuitry.
Users can make fun to connect the Digital Video Disk player with

"

the component video signal i nput terminal.
Provided with miniature tuner (TV/CATV).

"

Multifunctional remot e control permits picture adjustment.

"

Adoption of the CHANNEL GUARD function prevents the

"

specific channels from being selected, unless the “ID number” is
key in.

I2C bus control utilizes single chip ICs.

"

Adoption of the VIDEO ST A T US function.

"

Adoption of the ON/OFF TIMER funct i on.

"

"
"
"
"
"
"
"
"
"

MAIN DIFFERENCE LIST

!!!!

Parts Name

MAIN PWB SFD-1001A-M2 SFD-1002A-M2 SFD-1001A-M2 SFD-1002A-M2

!

ITC TUBE A68QDN891X001 A68ADT25X01 A68QDN891X001 A68ADT25X01

Model name

AV-27D302

/S

AV-27D302

Built-in V-CHIP system.
With 75ΩV/U in common (F-Type) ANT Terminal.
SLEEP TIMER for setti ng i n real t i me.
Closed-caption broadcasts can be viewed.
Built-in MTS system.
Built-in HYPER-SURROUND system.
S-VIDEO input terminal for taking best advantage of Super VHS.
Variable Audio output term i nal .
2 LINE Digital Comb filter Improved pict ure qual i ty.

/R

AV-27D202

/S

AV-27D202

/R

!

FRONT CABI. ASS’Y GQ10018-001A-A GQ10018-002A-A
DOOR GQ30024-002A-A GQ30024-001A-A
JVC MARK CM48006-007-C CM48006-006-C
POWER KNOB GQ30026-002A-A GQ30026-001A-A
CONTROL KNOB GQ30025-002A-A GQ30025-001A-A

HOW TO IDENTIFY MODELS

The difference between AV-27D302/S and AV-27D302/R is in the PICTURE TUBE .
As the result of the difference in picture tube, the MAIN PWB al so differs.
In the same way, the diff erence between AV-27D202/S and AV-27D202/R is i n the PICTURE TUBE too.

!

Parts name

RATING LABEL

!

Model

AV-27D302

Indicated AV-27D302 Indicated AV-27D302 Indicated AV-27D202 Indicated AV-27D202

/S

AV-27D302

/R

AV-27D202

/S

AV-27D202

/R

Indicated “S”

4

Indicated “R”

No.51788

Indicated “S”

Indicated “R”

A

A

FUNCTIONS

FRONT PANEL CONTROL

■■■■

REAR TERMINAL

■■■■

V-27D302
V-27D202

①②③④

①

VIDEO INPUT TERMINAL

②

AUDIO L INPUT TERMINAL

③

AUDIO R INPUT TERMINAL

④

MENU KEY

⑤

CHANNEL -/+ KEY (OPERATE KEY)

⑥

VOLUME -/+ KEY

⑦

ON TIMER LED

⑧

POWER BUTTON

REMOTE CONTROL UNIT

■■■■

[RM-C303G]

⑤⑥ ⑦⑧

②

①

①

AUDIO OUTPUT TERMINAL

②

INPUT1 TERMINAL(S, V, L, R)

③

INPUT2 TERMINAL(V/Y, P

④

AERIAL SOCKET

③

④

R

, PB, L, R)

①

②
③
④
⑤

⑥

⑦

⑧

⑨
⑩
⑪

⑫

⑬

⑭

⑮

⑯

No.51788

①

TV / CATV

②

VIDEO STATUS

③

BBE

④

DISPLAY

⑤

SLEEP TIMER

⑥

HYPER SURROUND

⑦

MUTING

⑧

MENU

⑨

POWER

⑩

VCR / DVD

⑪

INPUT

⑫

CHANNEL KEYS

⑬

LIGHT

⑭

V-CHIP

⑮

EXIT

⑯

VCR CONTROL KEYS

5

A

V-27D302

A

V-27D202

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Disconnect the power plug from wall outlet.

11

2. As shown in the Fig.1, remove the

3. As shown in Fig.1, remove the

4. Then remove the REAR COVER toward you.

screws marked

4

screws marked

""""

.

!!!!

.

CHECKING THE PW BOARD

To check the PW Board from back side.

1. Pull out the chassis (refer to REMOVING THE CHASSIS).

2. Erect the chassis vertically so that you can easily check the back
side of the PW Board.

REMOVING THE CHASSIS

After removing the REAR COVER.

"

1. Slightly raise the both sides of the chassis by hand and remove the
two claws under the both sides of the chassis from the front
cabinet.

2. Withdraw the chassis backward.

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

REMOVING THE SPEAKER

After removing the rear cover.

"

1. As shown in Fig. 1, removing the
remove the speaker.

2. Follow the same steps when removing the other hand speaker.

NOTE :

When removing the screws marked

remove the lower side screw first, and then remove the
upper one.

2

screws marked

of the speaker,

####

####

,

then

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
connected to the CRT SOCKET PW board.

’’’’

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 s ure to tie the wires with a
new cable tie.

Y) is

6

No.51788

A

A

FRONT CABINET

r

CRT

SPEAKER

####

CRT SOCKET PWB

MAIN PWB

V-27D302
V-27D202

This exploded view describes about the
AV-27D302/R and /S.
Although the AV-27D202/R, /S is
slightly different from this figure, you
can use the exploded view fo
disassembling the AV-27D202/R, /S in
the same step as for this one.

HVT

SPEAKER

####

POWER PWB

REAR COVER

""""

(×4)

!!!!

(×11)

POWER CORD

Fig.1

No.51788

7

A

V-27D302

A

V-27D202

MEMORY IC REPLACEMENT

1. Memory IC

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

2. Memory IC replacement procedure

Procedure Screen display

(1) Power off

Switch off the power and disconnect the power cord from the outlet.

(2) Replace the memory IC

Initial value must be entered into the new IC.

(3) Power on

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

(4) System constant check and setting

1) Press SLEE P 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 simultaneously.

2) The SERVICE MENU screen of Fig.1 is displayed.

3) While the SERVICE MENU is displayed, again simultaneously press
the DISPLAY and VIDEO STATUS keys to display the Fig.2 SYSTEM
CONSTANT screen.

4) Refer to the SYSTEM CONSTANT table and check t he setting items.
Where these differ, select the setting item with the UP/DOWN (▲/▼)
key and adjust the setting with the LEFT/RIGHT ( ) keys.

5) After adjusting, release the LEFT/RIGHT( ) key to store the set ting
value.

6) Press the EXIT key twice to return the normal screen.

(5) Receive channel setting

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

(6) User settings

Check the user setting items according to Table 2.
Where these do not agree, refer to the OPERATING INSTRUCTIONS
(USER'S GUIDE) and set the items as described.

SERVICE MENU
PICTURE SOUND

THEATER
LOW LIGHT HIGH LIGHT
RF AFC CHK

SELECT BY EXIT BY
OPERATE BY EXIT

Fig.1

SYSTEM CONSTANT

**-

**-********

MODEL :
V-CHIP : YES
CAN V-CHIP : YES

***

***********

****-***

********

***********

******

******

SELECT BY EXIT BY
OPERATE BY EXIT

**-**-

****

********

Fig.2

(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.

8

No.51788

A

A

TABLE 1 (System Constant setting)

A

A

Setting item Setting content

AV-27D302

Setting value

/R, /S

AV-27D202

V-27D302
V-27D202

/R, /S

MODEL AV-27D302 AV-27D202

V-CHIP YES YES

CAN V-CHIP YES YES

V-27D302

AV-27230 AV-20D202

YES NO

YES NO

V-27D202

TABLE 2 (User setting value)

Setting item Setting value

1. Use remot e controller k eys
POWER
CHANNEL
CHANNEL PRESET
VOLUME
TV/VIDEO(INPUT)
DISPLAY
SLEEP TIMER
VIDEO STATUS
HYPER SURROUND

2. Setting of MENU
TINT
COLOR
PICTURE
BRIGHT
DETAIL
NOISE MUTING
SET VIDEO STATUS
BASS
TREBLE
BALANCE
MTS
TV SPEAKER
SET CLOCK
ON/OFF TIMER
LANGUAGE
CLOSED CAPTION
BACKGROUND
V2 COMPONENT IN
AUTO TUNER SETUP
CHANNEL SUMMARY
V-CHIP
V-CHIP RATINGS
SET LOCK CODE
UNRATED

ON
CH 02
See OPERATING INSTRUCTIONS.
10
TV
OFF
OFF
STANDARD
OFF

CENTER
CENTER
CENTER
CENTER
CENTER
ON
ALL CENTER
CENTER
CENTER
CENTER
STEREO
ON
Unnecessary to set
NO
ENGLISH
OFF
BLACK
NO
TUNER MODE : AIR
Unnecessary to set
OFF
ALL OFF
Unnecessary to set
VIEW

No.51788

9