JVC AV-27920 Manuel utilisateur

JVC

CONTENTS

SPECIFICATIONS

SAFETY

PRECAUTIONS

-*:<**2**-*22*%

FEATURES

°-«--++-e

+22

e022

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ene

DIFFERENCE

LIST

MAIN

PARTS

OPERATING

INSTRUCTIONS

SPECIFIC

SERVICE

INSTRUCTIONS

Glatelo\bidsa

ale

ake

Sierra

SERVICE

ADJUSTMENTS

STANDARD

CIRCUIT

DIAGRAM

(APPENDED)

«+

---+++--crereeeee

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reese

eee

2-1

PARTS

LIST

TUTE

ECELELET

TEE

1998

VICTOR

COMPANY

JAPAN,

LTD.

No.

51370

Mar.

1998

AV-27920

SPECIFICATIONS

Dimensions

Mass

System

Color

Sound

System

Receiving

Channels

and

Frequency

Band

UHF

Band

CATV

Receiving

Channels

and

Frequency

Low

Band

High

Band

Mid

Band

Super

Band

Hyper

Band

Ultra

Band

Sub

Mid

Band

TV/ICATV

Total

Channel

Intermediate

Frequency

Video

Carrier

Sound

Carrier

Color

Sub

Carrier

Power

Input

Power

Consumption

Picture

Tube

High

Voltage

Audio

Power

Output

Input

Video

Input

Audio

Input

Antenna

Terminal

Remote

Control

Unit

25-3/4"

23-3/8"

19-1/2”

65.4em

59.3cm

49.4cm

68.5

ibs

31.1

CCIR(M)

(Multi

Channel

Sound)

(02~06)

54MHz~88MHz

(07~13)

174MHz~216MHz

(14~69)

470MH2~806MHz

(02~06,

A-8)

(02~06&01)

(07~13)

(A~1)

(14~22)

(J~W)

(23~36)

(W+1~W+28)

(37~64)

(W+29~W+84)

(65~125)

(A8,

A4~A1)

(01,

96~99)

180

Channels

(64MHz~804MHz)

45.75MHz

41.25MHz

(4.5MHz)

3.58MHz

120V

AC,

60Hz

113W

(US)

/1.8A

(CA)

27”

(68cm)

Measured

Diagonally

29kV+1kV

(at

zero

beam

current)

3-1/2"

9em

Oval

type

1.2W

1Vp-p,

752

(RCA

jack)

500mVrms

(

-4dBs

High

Impedance

(RCA

jack)

Low

impedance

(400Hz

when

modulated

100%)

(RCA

jack)

752

(VHF/UHF)

Terminal,

F-Type

Connector

RM-C754-1C

(AA/R6/UM-3

battery

Design

specification

are

subject

change

without

notice.

No.51370

AV-27920

SAFETY

PRECAUTIONS

The

design

this

product

contains

special

hardware,

many

10.

Isolation

Check

circuits

and

components

specially

for

safety

purposes.

For

continued

protection,

changes

should

made

the

original

design

unless

authorized

writing

the

manufacturer.

Replacement

parts

must

identical

those

used

the

original

circuits.

Service

should

performed

qualified

personnel

only.

(Safety

for

Electrical

Shock

Hazard)

After

re-assembling

the

product,

always

perform

isolation

check

the

exposed

metal

parts

the

cabinet

(antenna

terminals,

video/audio

input

and

output

terminals,

Control

knobs,

metal

cabinet,

screwheads,

earphone

jack,

control

shafts,

etc.)

Alterations

the

design

circuitry

the

products

should

not

sure

the

product

safe

operate

without

danger

electrical

made.

Any

design

alterations

additions

will

void

the

shock.

manufacturer's

warranty

and

will

further

relieve

the

manufacturer

(1)

Dielectric

Strength

Test

;

responsibility

for

personal

injury.or

property

damage

resulting

The

isolation

between

the

primary

circuit

and

all

metal

parts

therefrom.

exposed

the

user,

particularly

any

exposed

metal

part

having

Many

electrical

and

mechanical

parts

the

products

have

return

path

the

chassis

should

withstand

voltage

1100V

special

safety-related

characteristics.

These

characteristics

are

(r.m.s.)

for

period

one

second.

often

not

evident

from

visual

inspection

nor

can

the

protection

(...

Withstand

voltage

1100V

(r.m.s.)

appliance

afforded

them

necessarily

obtained

using

replacement

rated

120V,

and

3000V

(r.m.s.)

appliance

rated

components

rated

for

higher

voltage,

wattage,

etc.

Replacement

200V

more,

for

period

one

second.)

parts

which

have

these

special

safety

characteristics

are

This

method

test

requires

test

equipment

not

generally

found

identified

the

parts

list

Service

manual.

Electrical

the

service

trade.

components

having

such

features

are

identified

shading

(2)

Leakage

Current

Check

the

schematics

and

(A\)

the

parts

list

Service

Plug

the

line

cord

directly

into

the

outlet

(do

not

use

line

;

manual.

The

use

substitute

replacement

which

does

not

isolation

transformer

during

this

check.).

Using

“Leakage

have

the

same

safety

characteristics

the

recommended

Current

Tester",

measure

the

leakage

current

from

each

exposed

replacement

part

shown

the

parts

list

Service

manual

may

metal

part

the

cabinet,

particularly

any

exposed

metal

part

cause

shock,

fire,

other

hazards.

having

return

path

the

chassis,

known

good

earth

ground

Use

isolation

transformer

when

hot

chassis.

(water

pipe,

etc.).

Any

leakage

current

must

not

exceed

0.5mA

(

The

chassis

and

any

sub-chassis

contained

some

products

are

(r.m.s.).

connected

one

side

the

power

line.

isolation

However,

tropical

area,

this

must

not

exceed

0.2mA

transformer

adequate

capacity

should

inserted

between

the

(r.m.s.).

product

and

the

power

supply

point

while

performing

any

Alternate

Check

Method

service

some

products

when

the

HOT

chassis

exposed.

Plug

the

line

cord

directly

into

the

outlet

(do

not

use

line

Don't short

between

the

LIVE

side

ground

and

ISOLATED

isolation

transformer

during

this

check.).

Use

voltmeter

(NEUTRAL)

side

ground

EARTH

side

ground

when

having

1000

ohms

per

volt

sensitivity

the

following

repairing.

manner.

Connect

15009

10W

resistor

paralleled

0.15

Some

model's

power

circuit:

partly

different

the

GND.

The

AC-type

capacitor

between

exposed

metal

part

and

known

difference

the

GND

shown

the

LIVE

(.L)

side

GND,

the

good

earth

ground

(water

pipe,

etc.).

Measure

the

voltage

ISOLATED(NEUTRAL)

(+)

side

GND

and

EARTH

(@)

side

across

the

resistor

with

the

voltmeter.

Move

the

resistor

GND.

Don't

short

between

the

LIVE

side

GND

and

connection

each

exposed

metal

part,

particularly

any

exposed

ISOLATED(NEUTRAL)

side

GND

EARTH

side

GND

and

metal

part

having

return

path

the

chassis,

and

measure

the

never

measure

with

measuring

apparatus

(oscilloscope

etc.)

the

voltage

across

the

resistor.

Now,

reverse

the

plug

the

LIVE

side

GND

and

ISOLATED(NEUTRAL)

side

GND

outlet

and

repeat

each

measurement.

Any

voltage

measured

must

‘EARTH

side

GND

the

same

time.

not

exceed

0.75V

(r.m.s.).

This

corresponds

0.5mA

above

note

will

not

kept,

fuse

any

parts

will

broken,

(r.m.s.).

any

repair

has

been

made

the

chassis,

recommended

However,

tropical

area,

this

must

not

exceed

0.3V

(r.m.s.).

that

the

setting

should

checked

adjusted

(See

This

corresponds

0.2mA

(r.m.s.).

ADJUSTMENT

POWER

SUPPLY).

The

high

voltage applied

the

picture

tube

must

conform

with

VOLTMETER

that

specified

Service

manual.

Excessive

high

voltage

can

(HAVING

1000

2/V,

cause

increase

X-Ray

emission,

arcing

and

possible

SENSITIVITY)

;

component

damage,

therefore

operation

under

excessive

high

GOOD

voltage

conditions

should

kept

minimum,

should

padi

prevented.

severe

arcing

occurs,

remove

the

power

immediately

and

determine

the

cause

visual

inspection

PLACE

THIS

PROBE

;

(incorrect

installation,

cracked

melted

high

voltage

harness,

EACH

EXPOSED

poor

soldering,

etc.).

maintain

the

proper

minimum

level

soft

15002

10W

METAL

PART

X-Ray

emission,

components

the

high

voltage

circuitry

including

the

picture

tube

must

the

exact.

replacements

41.

High

voltage

hold

down

circuit

check.

alternatives

approved

the

manufacturer

the

complete

After

repair

the

high

voltage

hold

down

circuit,

this

circuit

shail

Poe

Seek

high

voltage

drawing

arc.

Use

high

voltage

eee

Sen:

meter

high

voltage

probe

with

VTVM.

Discharge

the

picture

pees

TiO

CIOEe

Heat

yates

HOKIAO

Creu:

tube

before

attempting

meter

connection,

connecting

clip

lead

the

ground

frame

and

connecting

the

other

end

the

lead This

mark

shows

fast

POWER

CORD

through

10k92

resistor

the

anode

button.

operating

fuse,

the

REPLACEMENT

WARNING.

When

service

required,

observe

the

original

lead

dress.

Extra

letters

indicated

below

Connecting

the

line

side

precaution

should

given

assure

correct

lead

dress

the

high

voltage

circuit

area.

Where

short

circuit

has

occurred,

those

components

that

indicate

evidence

overheating

should

replaced.

Always

use

the

manufacturers

replacement

components.

No.51370

show

the

rating.

power

cord

to"

mark

side.

AV-27920

FEATURES

New

chassis

design

enables

use

single

board

with

simplified

circuitry.

;

Provided

with

miniature

tuner

(TV/CATV).

Multifunctional

remote

control

permits

picture

adjustment.

Adoption

the

CHANNEL

GUARD

function

prevents

the

specific

channels

from

being

selected,

unless

the

“ID

number’

key

in.

(°C

bus

control

utilizes

single

chip

ICs.

Built-in

HYPER-SURROUND

system.

Adoption

the

VIDEO

STATUS

function.

Adoption

the

ON/OFF

TIMER

function.

With

752

V/U

common

(F-Type)

ANT

Terminal.

SLEEP

TIMER

for

setting

real

time.

Closed-caption

broadcasts

can

viewed.

S-VIDEO

input

terminal

for

taking

best

advantage

Super

VHS.

Audio

Video

input

terminal.

Variable

Audio

output

terminal.

Built-in

MTS

system.

DIFFERENCE

LIST

MAIN

PARTS

AV-27920(US)

—

AV-27920(CA)

Parts

Name

INST

BOOK

(FRENCH)

;

LCT0108-001B-A

SVC

CENTER

LIST

BT-20071B-Q

REGI.

CARD

BT-51006-1Q

WARRANTY

CARD

BT-52002-1Q

No.51370

AV-27920

OPERATING

INSTRUCTIONS

The

operating

instructions

are

the

same

for

C-20910(US&CA)/AV-20920(US&CA)/AV-20921(US&CA)

(No.51364),

Therefore,

please

refer

the

C-20910(US&CA)/AV-20920(US&CA)/AV-20921(US&CA)(N0.51364)

SERVICE

MANUAL

for

detailed

instructions.

REMOTE

CONTROL

UNIT

[RM-C754-1C]

CHANNEL

MUTING

VOLUME

€Ty

exit

on.

FRONT

PANEL

WMENU

—

CHANNEL

——

VOLUME

POWER

4OPERATE

REAR

PANEL

No.51370

}

AV-27920

SPECIFIC

SERVICE

INSTRUCTIONS

DISASSEMBLY

PROCEDURE

REMOVING

THE

REAR

COVER

Unplug

the

power

supply

cord.

Remove

the

screws

marked

and

screws

marked

shown

Fig.1.

Withdraw

the

REAR

COVER

toward

you.

[CAUTION]

When

reinstalling

the

rear

cover,

carefully

push

inward

after

inserting

the

MAIN

PWEB

into

the

rear

cover

groove.

REMOVING

THE

MAIN

BOARD

After

removing

the

rear

cover.

Pick

this

side

the

MAIN

PWB

and

raise

one

slightly,

take

off

the

PWB

stopper

marked

from

the

cabinet

bottom.

Pull

out

the

MAIN

PWB

is.

(If

necessary,

take

off

the

wire

clamp

and

connectors,

etc.)

REMOVING

THE

SPEAKER

After

removing

the

MAIN

board.

Remove

the

screws

marked

shown

Fig.1.

Withdraw

the

speaker

backward.

the

same

steps

when

removing

the

other

hand

speaker.

CHECKING

THE

MAIN

BOARD

check

the

back

side

the

MAIN

Board.

Pull

out

the

MAIN

PWB.

(Refer

REMOVING

THE

MAIN

PWB).

Erect

the

chassis

vertically

that

you

can

easily

check

the

back

side

the

MAIN

Board.

[CAUTION]

When

erecting

the

MAIN

PWB,

careful

that

there

will

contacting

with

other

Board.

Before

turning

power,

make

sure

that

the

CRT

earth

wire

and

other

connectors

are

properly

connected.

WIRE

CLAMPING

AND

CABLE

TYING

sure

clamp

the

wire.

Never

remove

the

cable

tie

used

for

tying

the

wires

together.

Should

inadvertently

removed,

sure

tie

the

wires

with

new

cable

tie.

No.51370

AV-27920

FRONT

CABINET

CRT

SOCKET

PWB

(Within

MAIN

PWB)

SPEAKER

MAIN

PWB

Ren

NET

MERGE

SEA

ASO

nar

umes

termes

renee

REAR

COVER

SPEAKER

Fig.1

No.51370

AV-27920

MEMORY

REPLACEMENT

Memory

This

model

use

memory

IC.

This

memory

stores

data

for

proper

operation

the

video

and

deflection

circuits.

When

replacing,

sure

use

containing

this

(initial

value)

data.

Memory

replacement

procedure

—

Switch

off

the

power

and

disconnect

the

power

cord

from

the

outlet.

(2)

Replace

the

memory

Initial

value

must

entered

into

the

new

IC.

(3)

Power

Connect

the

power

cord

the

outlet

and

switch

the

power.

(4)

System

constant

check

and

setting

Simultaneously

press

the

DISPLAY

key

and

VIDEO

STATUS

key

the

remote

control

unit.

The

SERVICE

screen

Fig.1

displayed.

While

the

SERVICE

displayed,

again

simultaneously

press

[SERVICE

PICTURE

SOUND

the

DISPLAY

and

VIDEO

STATUS

keys

display

the

Fig.2

SYSTEM

GAME

CONSTANT

screen.

LOW

LIGHT

HIGH

LIGHT

AFC

CHK

Refer

the

SYSTEM

CONSTANT

table

and

check

the

setting

items.

Where

these

differ,

select

the

setting

item

with

the

UP/DOWN

key

and

adjust

the

setting

with

the

LEFT/RIGHT

keys.

(The

letters

the

selected

item

are

displayed

yellow.)

After

adjusting,

release

the

LEFT/RIGHT

key

store

the

setting

value.

Press

the

EXIT

key

twice

return

the

normal

screen.

vco(

BUS

CTRL

SELECT

aij

&xiTBY

OPERATE

(EXIT)

[

SYSTEM

CONSTANT

MTS

YES

VARI.OUT

YES

(5)

Receive channei

setting

Refer

the

OPERATING

INSTRUCTIONS(USER'S

GUIDE)

and

set

the

GAME

YES

receive

channels

(Channels

Preset)

described.

SURROUND

YES

S-VIDEO

YES

M37272M8-4SP

SELECT

fal

[yi

EXIT

OPERATE

ie!

EXIT

(6)

User

settings

Check

the

user

setting

items

according

Table

Where

these

not

agree,

refer

the

OPERATING

INSTRUCTIONS

(USER'S

GUIDE)

and

set

the

items

described.

(7)

SERVICE

setting

Verify

what

set

the

SERVICE

MENU,

and

set

whatever

necessary.(Fig.1)

Refer

the

SERVICE

ADJUSTMENT

for

setting.

No.51370

AV-27920

Setting

content

TABLE

(System

Constant

setting)

TABLE

(User

setting

value)

Setting

item

Setting

value

Use

remote

controller

keys

POWER

CHANNEL

PRESET

VOLUME

DISPLAY

SLEEP

TIMER

VIDEO

STATUS

CLOSED

CAPTION

HYPER

SURROUND

Setting

TINT

COLOR

PICTURE

BRIGHT

DETAIL

NOISE

MUTING

SET

VIDEO

STATUS

BASS

TREBLE

BALANCE

MTS

SPEAKER

SET

CLOCK

ON/OFF

TIMER

CHANNEL

SUMMARY

SET

LOCK

CODE

AUTO

TUNER

SETUP

BACKGROUND

CLOSED

CAPTION

LANGUAGE

OFF

See

OPERATING

INSTRUCTIONS.

OFF

O(OFF)

STANDARD

OFF(CC1/T1)

OFF

CENTER

ALL

CENTER

STEREO

Unnecessary

set

SET

OPTIONALLY

Unnecessary

set

TUNER

MODE

AIR

BLACK

CAPTION:

CC1

TEXT:

ENG

No.51370

AV-27920

SERVICE

ADJUSTMENT

PREPARATION:

You

can

make

the

necessary

adjustments

for

this

unit

with

either

the

Remote

Control

Unit

With

the

adjustment

tools

and

parts

given

below.

Adjustment

with

the

Remote

Control

Unit

made

the

basis

the

initial

setting

values,

however,

the

new

setting

values

which

set

the

screen

its

optimum

condition

may

differ

from

the

initial

settings.

Turn

the

power

for

set

and

test

equipment

before

use,

and

start

the

adjustment

procedures

after

waiting

least

minutes.

Make

sure

that

power

turned

correctly.

ADJUSTMENT

EQUIPMENT

voltmeter

(or

digital

voltmeter)

Oscilloscope

Signal

generator

(Pattern

generator)

[NTSC]

Remote

control

unit

audio

multiplex

signal

generator.

Frequency

counter

OnRYWN

ADJUSTMENT

LOCATIONS

VOL+

VOL-

CH+

TP-12B

T1341

TP-91

(B1)

TP-E

(1)

Lav

our

S-IN

1C702

Unless

otherwise

specified,

prepare

the

most

suitable

reception

input

signal

for

adjustment.

Never

touch

any

adjustment

parts

which

are

not

specified

the

list

for

this

adjustment

variable

resistors,

transformers,

condensers,

etc.

Presetting

before

adjustment.

Unless

otherwise

specified

the

adjustment

instructions,

preset

the

following

functions

with

the

remote

control

unit:

VIDEO

STATUS

STANDARD

BASS,

TREBLE,

CENT!

BALANCE

ENTER

ADJUSTMENT

ITEMS

POWER

WHITE

BALANCE

SUPPLY

(Low

Light)

WHITE

BALANCE

VCO

ead

(High

Light)

RF.

AGC

SUB

BRIGHT

FOCUS

SUB

CONTRAST

SIZE

SUB

COLOR

POSITION

SUB

TINT

Adjustment

items

MTS

INPUT

LEVEL

check

MTS

STEREO

vco

MTS

SAP

VCO

MTS

FILTER

check

MTS

SEPARATION

c=]

STEREO[S]

MAIN

PWB

CRT

SOCKET

PWB)

'2P

(Within

MAIN

PWB

ASS'Y)

(SOLDER

SIDE)

UPPER

FOCUS

LOWER

SCREEN

CRT

EARTH

(BRAIDED

ASS'Y)

410

No.51370

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