JVC AV-27920 User manual

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JVC

CONTENTS

|

|

SPECIFICATIONS

re

2

@

SAFETY

PRECAUTIONS

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

Ce

ee

3

@

FEATURES

°-«--++-e

+22

e022

eee

ene

ey

4

i

|

DIFFERENCE

LIST

OF

MAIN

PARTS

i

ee

4

a

OPERATING

INSTRUCTIONS

ee

ee

ee

ee

ay

5

i]

SPECIFIC

SERVICE

INSTRUCTIONS

ee

ra

Glatelo\bidsa

ale

ake

Sierra

6

i

|

SERVICE

ADJUSTMENTS

ee

10

%

STANDARD

CIRCUIT

DIAGRAM

(APPENDED)

«+

---+++--crereeeee

reer

e

reese

ee

ee

eee

es

2-1

i]

PARTS

LIST

ee

ry

TUTE

ECELELET

TEE

er

25

F

COPYRIGHT

©

1998

VICTOR

COMPANY

OF

JAPAN,

LTD.

No.

51370

Mar.

1998

AV-27920

SPECIFICATIONS

Dimensions

(W

x

H

x

D}

Mass

TV

RF

System

Color

Sound

System

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/ICATV

Total

Channel

Intermediate

Frequency

Video

IF

Carrier

Sound

JF

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"

x

23-3/8"

x

19-1/2”

/

65.4em

x

59.3cm

x

49.4cm

68.5

ibs

/

31.1

kg

CCIR(M)

(Multi

Channel

Sound)

(02~06)

54MHz~88MHz

(07~13)

174MHz~216MHz

(14~69)

470MH2~806MHz

(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)

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)

2"

x

3-1/2"

/5

x

9em

Oval

type

x

2

1.2W

x2

1Vp-p,

752

(RCA

pin

jack)

500mVrms

(

-4dBs

),

High

Impedance

(RCA

pin

jack)

Low

impedance

(400Hz

when

modulated

100%)

(RCA

pin

jack)

752

(VHF/UHF)

Terminal,

F-Type

Connector

RM-C754-1C

(AA/R6/UM-3

battery

x

2)

Design

&

specification

are

subject

to

change

without

notice.

No.51370

AV-27920

SAFETY

PRECAUTIONS

1.

The

design

of

this

product

contains

special

hardware,

many

10.

Isolation

Check

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.

(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

2.

Alterations

of

the

design

or

circuitry

of

the

products

should

not

be

be

sure

the

product

is

safe

to

operate

without

danger

of

electrical

made.

Any

design

alterations

or

additions

will

void

the

shock.

manufacturer's

warranty

and

will

further

relieve

the

manufacturer

(1)

Dielectric

Strength

Test

;

!

of

responsibility

for

personal

injury.or

property

damage

resulting

The

isolation

between

the

AC

primary

circuit

and

all

metal

parts

i

therefrom.

exposed

to

the

user,

particularly

any

exposed

metal

part

having

a

i

3.

Many

electrical

and

mechanical

parts

in

the

products

have

return

path

to

the

chassis

should

withstand

a

voltage

of

1100V

i

special

safety-related

characteristics.

These

characteristics

are

AC

(r.m.s.)

for

a

period

of

one

second.

I

often

not

evident

from

visual

inspection

nor

can

the

protection

(...

.

Withstand

a

voltage

of

1100V

AC

(r.m.s.)

to

an

appliance

i

afforded

by

them

necessarily

be

obtained

by

using

replacement

rated

up

to

120V,

and

3000V

AC

(r.m.s.)

to

an

appliance

rated

i

components

rated

for

higher

voltage,

wattage,

etc.

Replacement

200V

or

more,

for

a

period

of

one

second.)

parts

which

have

these

special

safety

characteristics

are

This

method

of

test

requires

a

test

equipment

not

generally

found

i

identified

in

the

parts

list

of

Service

manual.

Electrical

in

the

service

trade.

components

having

such

features

are

identified

by

shading

(2)

Leakage

Current

Check

i

on

the

schematics

and

by

(A\)

on

the

parts

list

in

Service

Plug

the

AC

line

cord

directly

into

the

AC

outlet

(do

not

use

a

line

;

manual.

The

use

of

a

substitute

replacement

which

does

not

isolation

transformer

during

this

check.).

Using

a

“Leakage

:

have

the

same

safety

characteristics

as

the

recommended

Current

Tester",

measure

the

leakage

current

from

each

exposed

j

replacement

part

shown

in

the

parts

list

of

Service

manual

may

metal

part

of

the

cabinet,

particularly

any

exposed

metal

part

i

cause

shock,

fire,

or

other

hazards.

having

a

return

path

to

the

chassis,

to

a

known

good

earth

ground

:

4.

Use

isolation

transformer

when

hot

chassis.

(water

pipe,

etc.).

Any

leakage

current

must

not

exceed

0.5mA

(

The

chassis

and

any

sub-chassis

contained

in

some

products

are

AC

(r.m.s.).

i

connected

to

one

side

of

the

AC

power

line.

An

isolation

However,

in

tropical

area,

this

must

not

exceed

0.2mA

AC

transformer

of

adequate

capacity

should

be

inserted

between

the

(r.m.s.).

product

and

the

AC

power

supply

point

while

performing

any

@

Alternate

Check

Method

service

on

some

products

when

the

HOT

chassis

is

exposed.

Plug

the

AC

line

cord

directly

into

the

AC

outlet

(do

not

use

a

line

5.

Don't short

between

the

LIVE

side

ground

and

ISOLATED

isolation

transformer

during

this

check.).

Use

an

AC

voltmeter

(NEUTRAL)

side

ground

or

EARTH

side

ground

when

having

1000

ohms

per

volt

or

more

sensitivity

in

the

following

repairing.

manner.

Connect

a

15009

10W

resistor

paralleled

by

a

0.15

4

F

Some

model's

power

circuit:

is

partly

different

in

the

GND.

The

AC-type

capacitor

between

an

exposed

metal

part

and

a

known

difference

of

the

GND

is

shown

by

the

LIVE

:

(.L)

side

GND,

the

good

earth

ground

(water

pipe,

etc.).

Measure

the

AC

voltage

ISOLATED(NEUTRAL)

:

(+)

side

GND

and

EARTH

:

(@)

side

across

the

resistor

with

the

AC

voltmeter.

Move

the

resistor

GND.

Don't

short

between

the

LIVE

side

GND

and

connection

to

each

exposed

metal

part,

particularly

any

exposed

ISOLATED(NEUTRAL)

side

GND

or

EARTH

side

GND

and

metal

part

having

a

return

path

to

the

chassis,

and

measure

the

never

measure

with

a

measuring

apparatus

(oscilloscope

etc.)

the

AC

voltage

across

the

resistor.

Now,

reverse

the

plug

in

the

AC

LIVE

side

GND

and

ISOLATED(NEUTRAL)

side

GND

or

outlet

and

repeat

each

measurement.

Any

voltage

measured

must

‘EARTH

side

GND

at

the

same

time.

not

exceed

0.75V

AC

(r.m.s.).

This

corresponds

to

0.5mA

AC

If

above

note

will

not

be

kept,

a

fuse

or

any

parts

will

be

broken,

(r.m.s.).

:

6.

if

any

repair

has

been

made

to

the

chassis,

it

is

recommended

However,

in

tropical

area,

this

must

not

exceed

0.3V

AC

(r.m.s.).

that

the

B1

setting

should

be

checked

or

adjusted

(See

This

corresponds

to

0.2mA

AC

(r.m.s.).

i

ADJUSTMENT

OF

B1

POWER

SUPPLY).

i

7.

The

high

voltage applied

to

the

picture

tube

must

conform

with

AC

VOLTMETER

|

that

specified

in

Service

manual.

Excessive

high

voltage

can

(HAVING

1000

2/V,

i

cause

an

increase

in

X-Ray

emission,

arcing

and

possible

OR

MORE

SENSITIVITY)

;

component

damage,

therefore

operation

under

excessive

high

GOOD

|

voltage

conditions

should

be

kept

to

a

minimum,

or

should

be

padi

i

prevented.

If

severe

arcing

occurs,

remove

the

AC

power

i

immediately

and

determine

the

cause

by

visual

inspection

PLACE

THIS

PROBE

;

(incorrect

installation,

cracked

or

melted

high

voltage

harness,

ON

EACH

EXPOSED

i

poor

soldering,

etc.).

To

maintain

the

proper

minimum

level

of

soft

15002

10W

METAL

PART

X-Ray

emission,

components

in

the

high

voltage

circuitry

f

including

the

picture

tube

must

be

the

exact.

replacements

or

41.

High

voltage

hold

down

circuit

check.

alternatives

approved

by

the

manufacturer

of

the

complete

After

repair

of

the

high

voltage

hold

down

circuit,

this

circuit

shail

8

Poe

Seek

high

voltage

by

drawing

an

arc.

Use

a

high

voltage

Be

eee

Pe

Sen:

meter

or

a

high

voltage

probe

with

a

VTVM.

Discharge

the

picture

pees

OM

TiO

Se

CIOEe

We

Heat

yates

HOKIAO

WN

Creu:

i

tube

before

attempting

meter

connection,

by

connecting

a

clip

:

lead

to

the

ground

frame

and

connecting

the

other

end

of

the

lead This

mark

shows

a

fast

POWER

CORD

through

a

10k92

2W

resistor

to

the

anode

button.

operating

fuse,

the

REPLACEMENT

WARNING.

9.

When

service

is

required,

observe

the

original

lead

dress.

Extra

letters

indicated

below

Connecting

the

line

side

of

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

manufacturers

replacement

components.

No.51370

show

the

rating.

power

cord

to"

@"

mark

side.

AV-27920

FEATURES

@

New

chassis

design

enables

use

of

a

single

board

with

simplified

circuitry.

;

@

Provided

with

miniature

tuner

(TV/CATV).

Multifunctional

remote

control

permits

picture

adjustment.

@

Adoption

of

the

CHANNEL

GUARD

function

prevents

the

specific

channels

from

being

selected,

unless

the

“ID

number’

is

key

in.

@

(°C

bus

control

utilizes

single

chip

ICs.

Built-in

HYPER-SURROUND

system.

@

Adoption

of

the

VIDEO

STATUS

function.

Adoption

of

the

ON/OFF

TIMER

function.

With

752

V/U

in

common

(F-Type)

ANT

Terminal.

SLEEP

TIMER

for

setting

in

real

time.

Closed-caption

broadcasts

can

be

viewed.

S-VIDEO

input

terminal

for

taking

best

advantage

of

Super

VHS.

Audio

Video

input

terminal.

Variable

Audio

output

terminal.

Built-in

MTS

system.

DIFFERENCE

LIST

OF

MAIN

PARTS

AV-27920(US)

—

AV-27920(CA)

Parts

Name

INST

BOOK

(FRENCH)

;

x

LCT0108-001B-A

SVC

CENTER

LIST

x

BT-20071B-Q

REGI.

CARD

BT-51006-1Q

x

WARRANTY

CARD

x

BT-52002-1Q

4

No.51370

AV-27920

OPERATING

INSTRUCTIONS

e

The

operating

instructions

are

the

same

as

for

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

(No.51364),

Therefore,

please

refer

to

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

MENU

exit

on.

O

@

5)

@

@

FRONT

PANEL

WMENU

—

CHANNEL

+

——

VOLUME

+

POWER

4OPERATE

>

M@

REAR

PANEL

No.51370

5

|

}

i

t

|

|

7

i

|

i

|

i

|

|

i

i

|

|

|

i

a

i

AV-27920

SPECIFIC

SERVICE

INSTRUCTIONS

DISASSEMBLY

PROCEDURE

REMOVING

THE

REAR

COVER

4.

Unplug

the

power

supply

cord.

2.

Remove

the

7

screws

marked

@

and

2

screws

marked

®

as

shown

in

Fig.1.

3.

Withdraw

the

REAR

COVER

toward

you.

[CAUTION]

@

When

reinstalling

the

rear

cover,

carefully

push

it

inward

after

inserting

the

MAIN

PWEB

into

the

rear

cover

groove.

REMOVING

THE

MAIN

PW

BOARD

®

After

removing

the

rear

cover.

1.

Pick

this

side

of

the

MAIN

PWB

and

raise

one

slightly,

take

off

the

PWB

stopper

marked

©

from

the

cabinet

bottom.

2.

Pull

out

the

MAIN

PWB

as

it

is.

(If

necessary,

take

off

the

wire

clamp

and

connectors,

etc.)

REMOVING

THE

SPEAKER

@

After

removing

the

MAIN

PW

board.

1.

Remove

the

2

screws

marked

©

as

shown

in

Fig.1.

2.

Withdraw

the

speaker

backward.

3.

Follow

the

same

steps

when

removing

the

other

hand

speaker.

CHECKING

THE

MAIN

PW

BOARD

1.

To

check

the

back

side

of

the

MAIN

PW

Board.

1)

Pull

out

the

MAIN

PWB.

(Refer

to

REMOVING

THE

MAIN

PWB).

2)

Erect

the

chassis

vertically

so

that

you

can

easily

check

the

back

side

of

the

MAIN

PW

Board.

[CAUTION]

@

When

erecting

the

MAIN

PWB,

be

careful

so

that

there

will

be

no

contacting

with

other

PW

Board.

@

Before

turning

on

power,

make

sure

that

the

CRT

earth

wire

and

other

connectors

are

properly

connected.

WIRE

CLAMPING

AND

CABLE

TYING

1.

Be

sure

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.

6

No.51370

AV-27920

FRONT

CABINET

CRT

SOCKET

PWB

(Within

MAIN

PWB)

SPEAKER

MAIN

PWB

ee

Ren

A

eR

NET

MERGE

SEA

OL

Se

SA

ASO

nar

umes

termes

renee

an

gn

REAR

COVER

SPEAKER

Fig.1

No.51370

AV-27920

MEMORY

IC

REPLACEMENT

1.

Memory

IC

This

model

use

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

—

ae

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)

Simultaneously

press

the

DISPLAY

key

and

VIDEO

STATUS

key

of

the

remote

control

unit.

2)

The

SERVICE

MENU

screen

of

Fig.1

is

displayed.

3)

While

the

SERVICE

MENU

is

displayed,

again

simultaneously

press

[SERVICE

MENU

J

PICTURE

SOUND

the

DISPLAY

and

VIDEO

STATUS

keys

to

display

the

Fig.2

SYSTEM

GAME

CONSTANT

screen.

LOW

LIGHT

HIGH

LIGHT

RF

AFC

CHK

4)

Refer

to

the

SYSTEM

CONSTANT

table

and

check

the

setting

items.

Where

these

differ,

select

the

setting

item

with

the

MENU

UP/DOWN

key

and

adjust

the

setting

with

the

MENU

LEFT/RIGHT

keys.

(The

letters

of

the

selected

item

are

displayed

in

yellow.)

5)

After

adjusting,

release

the

MENU

LEFT/RIGHT

key

to

store

the

setting

value.

6)

Press

the

EXIT

key

twice

to

return

the

normal

screen.

vco(

PC

BUS

CTRL

SELECT

BY

aij

&xiTBY

OPERATE

BY

Sj

(EXIT)

[

SYSTEM

CONSTANT

MTS

>

YES

VARI.OUT

>

YES

(5)

Receive channei

setting

Refer

to

the

OPERATING

INSTRUCTIONS(USER'S

GUIDE)

and

set

the

2

GAME

:

YES

receive

channels

(Channels

Preset)

as

described.

SURROUND

:

YES

S-VIDEO

>

YES

M37272M8-4SP

SELECT

BY

fal

[yi

EXIT

BY

OPERATE

BY

ie!

EXIT

(6)

User

settings

Check

the

user

setting

items

according

to

Table

2.

Where

these

do

not

agree,

refer

fo

the

OPERATING

INSTRUCTIONS

(USER'S

GUIDE)

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.

8

No.51370

AV-27920

Setting

content

TABLE

1

(System

Constant

setting)

ee

TABLE

2.

(User

setting

value)

Setting

item

.

Setting

value

1.

Use

remote

controller

keys

POWER

CHANNEL

CHANNEL

PRESET

VOLUME

DISPLAY

SLEEP

TIMER

VIDEO

STATUS

CLOSED

CAPTION

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

CHANNEL

SUMMARY

SET

LOCK

CODE

AUTO

TUNER

SETUP

BACKGROUND

CLOSED

CAPTION

LANGUAGE

OFF

CH

02

See

OPERATING

INSTRUCTIONS.

10

OFF

O(OFF)

STANDARD

OFF(CC1/T1)

OFF

CENTER

CENTER

CENTER

CENTER

CENTER

ON

ALL

CENTER

CENTER

CENTER

CENTER

STEREO

ON

Unnecessary

to

set

NO

SET

OPTIONALLY

Unnecessary

to

set

TUNER

MODE

:

AIR

BLACK

CAPTION:

CC1

TEXT:

T1

ENG

No.51370

AV-27920

SERVICE

ADJUSTMENT

ADJUSTMENT

PREPARATION:

1.

You

can

make

the

necessary

adjustments

for

this

unit

with

either

the

Remote

Control

Unit

or

With

the

adjustment

tools

and

parts

as

given

below.

2.

Adjustment

with

the

Remote

Control

Unit

is

made

on

the

basis

of

the

initial

setting

values,

however,

the

new

setting

values

which

set

the

screen

to

its

optimum

condition

may

differ

from

the

initial

settings.

3.

Turn

on

the

power

for

set

and

test

equipment

before

use,

and

start

the

adjustment

procedures

after

waiting

at

least

30

minutes.

4.

Make

sure

that

AC

power

is

turned

on

correctly.

ADJUSTMENT

EQUIPMENT

DC

voltmeter

(or

digital

voltmeter)

Oscilloscope

Signal

generator

(Pattern

generator)

[NTSC]

Remote

control

unit

.

TV

audio

multiplex

signal

generator.

.

Frequency

counter

OnRYWN

>

ADJUSTMENT

LOCATIONS

VOL+

VOL-

CH+

CH

MENU

TP-12B

T1341

CW

TP-91

ee

(B1)

TP-E

(1)

Lav

IN

our

_]

S-IN

1C702

5.

Unless

otherwise

specified,

prepare

the

most

suitable

reception

or

input

signal

for

adjustment.

6.

Never

touch

any

adjustment

parts

which

are

not

specified

in

the

list

for

this

adjustment

-

variable

resistors,

transformers,

condensers,

etc.

7.

Presetting

before

adjustment.

Unless

otherwise

specified

in

the

adjustment

instructions,

preset

the

following

functions

with

the

remote

control

unit:

e@

VIDEO

STATUS

STANDARD

e@

BASS,

TREBLE,

CENT!

BALANCE

ENTER

ADJUSTMENT

ITEMS

B1

POWER

WHITE

BALANCE

SUPPLY

(Low

Light)

WHITE

BALANCE

IF

VCO

ead

(High

Light)

RF.

AGC

SUB

BRIGHT

FOCUS

SUB

CONTRAST

V.

SIZE

SUB

COLOR

H.

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