Hitachi 27ax4b/c732 User manual

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27AX3B/C731

SERVICE

MANUAL

|___27AXOB/C730__

MiGLXU

CHASSIS

RIC:

cLusBIG)

CLU-264

CAUTION:

Before

servicing

this

chassis,

it

is

important

that

the

service

technician

read

the

“Safety

Precaution”

and

“Product

Safety

Notices”

in

this

Service

Manual.

This

television

receiver

will

display

television

closed

captioning

(

)

in

accordance

with

or

CL)

paragraph

15.119

of

the

FCC

rules.

CONTENTS

Safety

Precautions

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Technical

Specifications

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DC

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Diagram

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Replacement

Parts

List

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19

SPECIFICATIONS

AND

PARTS

ARE

SUBJECT

TO

CHANGE

FOR

IMPROVEMENT

SOLID

STATE

COLOR

TELEVISION

July

1993

_

|

HHEA

-

MANUFACTURING

DIVISION

-

SAFETY

PRECAUTIONS

NOTICE:

Comply

with

all

cautions

and

safety

located

on

or

inside

the

cabinet

and

on

the

chassis

or

picture

tube.

WARNING:

Since

the

chassis

of

this

receiver

is

connected

to

one

side

of

the

AC

power

supply

during

operation,

whenever

the

receiver

is

plugged

in,

service

should

not

be

attempted

by

anyone

unfamiliar

with

the

precautions

necessary

when

working

on

this

type

of

receiver.

The

following

precautions

should

be

observed:

1.

Do

not

install,

remove,

or

handle

the

picture

tube

in

any

manner

unless

shatterproof

goggles

are

worn.

People

not

so

equipped

should

be

kept

away

from

the

body

while

handling.

.

When

service

is

required,

an

isolation

transformer

should

be

inserted

between

power

line

and

the

receiver

before

any

service

is

performed

on

a

“HOT”

chassis

receiver.

3.

When

replacing

a

chassis

in

the

receiver,

all

the

protective

devices

must

be

put

back

in

place,

such

as

barriers,

non-metallic

knobs,

adjustment

and

compartment

cover-shields,

isolation

resistors-

capacitors,

etc.

.

When

service

is

required,

observe

the

original

lead

dress

in

the

high

voltage

circuitry

area.

.

Always

use

the

manufacturer's

replacement

components.

Especially

critical

components

as

indicated

on

the

circuit

diagram

should

not

be

replaced

by

other

manufacturer's.

Furthermore,

where

a

short

circuit

has

occurred,

replace

those

components

that

indicate

evidence

of

overheating.

.

Before

returning

a

serviced

receiver

to

the

customer,

the

service

technician

must

thoroughly

test

the

unit

to

be

certain

that

it

is

completely

safe

to

operate

without

danger

of

electrical

shock,

and

be

sure

that

no

protective

device

built

into

the

‘

receiver

by

the

manufacturer

has

become

de-

fective,

or

inadvertently

defeated

during

servicing.

Therefore,

the

following

checks

should

be

performed

for

the

continued

protection

of

the

customer

and

service

technician.

-

Leakage

Current

Cold

Check

With

the

AC

plug

removed

from

the

120V

AC

60Hz

source,

place

a

jumper

across

the

two

plug

prongs.

Turn

the

AC

power

switch

on.

Using

an

insulation

tester

(DC500V),

connect

one

lead

to

the

jumpered

AC

plug

and

touch

the

other

lead

to

each

exposed

metal

part

(antennas,

screwheads,

metal

overlays,

control

shafts,

etc.),

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis

should

have

a

minimum

resistor

reading

of

0.24M

Q

and

a

maximum

resistor

reading

of

12M

Q.

Any

resistance

value

below

or

above

this

range

indicates

an

abnormality

which

requires

corrective

action.

Exposed

metal

parts

not

having

a

return

path

to

the

chassis

will

indicate

an

open

circuit.

Leakage

Current

Hot

Check

Plug

the

AC

line

cord

directly

into

an

AC

120V

60Hz

outlet

(do

not

use

an

isolation

transformer

for

this

check).

Turn

the

AC

power

switch

on.

Using

a

“leakage

Current

Tester

(Simpson

Model

229

or

equivalent)”,

measure

for

current

from

all

exposed

metal

parts

of

the

cabinet

(antennas,

screwheads,

metal

overlays,

control

shafts,

etc.),

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis,

to

a

known

earth

ground

(water

pipe,

conduit,

etc.).

Any

current

measured

must

not

exceed

0.5mA.

LEAKAGE

(READING

SHOULD

NOT

BE

ABOVE

0.5mA)

DEVICE

UNDER

CURRENT

TESTER

TEST

ALL

EXPOSED

METAL

SURFACES

2-WIRE

CORD

ALSO

TEST

WITH

PLUG

REVERSED

(USING

AC

ADAPTER

PLUG

AS

REQUIRED)

AC

Leakage

Test

AC

LEAKAGE

TEST

ANY

MEASUREMENTS

NOT

WITHIN

THE

LIMITS

OUTLINED

ABOVE

ARE

INDICATIVE

OF

A

POTENTIAL

SHOCK

HAZARD

AND

MUST

BE

CORRECTED

BEFORE

RETURNING

THE

RECEIVER

TO

THE

CUSTOMER.

High

Voltage

This

receiver

is

provided

with

a

hold

down

circuit

for

clearly

indicating

that

voltage

has

increased

in

excess

of

a

predetermined

value.

Comply

with

all

notes

described

in

this

Service

Manual

regarding

this

hold

down

circuit

when

servicing,

so

that

this

hold

down

circuit

is

operated

correctly.

Serviceman

Warning

|

With

minimum

Black

Level

and

Picture,

the

operating

high

voltage

in

this

receiver

is

lower

than

34.0kV.

In

case

any

component

having

influence

on

the

high

voltage

is

replaced,

confirm

that

high

voltage

with

minimum

Black

Level

and

Picture

is

lower

that

34.0kV.

To

measure

H.V.

use

a

high

impedance

H.V.

meter.

Connect

(-)

to

chassis

earth

and

(+)

to

the

CPT

anode

|

button

(See

the

following

connection

diagram).

NOTE:

Turn

the

power

switch

off

without

fail

before

the

connection

to

the

Anode

button

is

made.

C

4

CPT

ANODE

HIGH

IMPEDANCE

H.V.

METER

CHASSIS

GROUND

X-radiation

X-Radiation

TUBE:

The

primary

source

of

X

radiation

in

this

receiver

is

the

picture

tube.

The

tube

utilized

in

this

chassis

is

specially

constructed

to

limit

X

radiation

emission.

For

continued

X

radiation

protection,

the

replacement

tube

must

be

the

same

type

as

the

original,

HITACHI

approved

type.

,

When

troubleshooting

and

making

test

measurements

in

a

receiver

with

an

excessive

high

voltage

problem,

avoid

coming

unnecessarily

close

to

the

picture

tube

and

the

high

voltage

component.

Do

not

operate

the

chassis

longer

than

is

necessary

to

locate

the

cause

of

the

excessive

voltage.

PRODUCT

SAFETY

NOTICE

Many

electrical

and

mechanical

parts

in

HITACHI

television

receivers

have

special

safety

These

are

often

not

evident

from

visual

inspection

not

can

the

protection

afforded

by

them

necessarily

be

obtained

by

using

replacement

components

rated

for

higher

voltage,

wattage,

etc.

Replacements

parts

which

have

these

special

safety

characteristics

are

identified

in

this

Service

Manual.

Electrical

components

having

such

features

are

identified

with

an/\mark

in

the

schematics

and

parts

list

in

this

Service

Manual.

The

use

of

a

substitute

replacement

component

which

does

not

have

the

same

safety

characteristics

as

the

HITACHI

recommended

replacement

one,

shown

in

the

parts

list

in

this

Service

Manual,

may

create

shock,

fire,

X-radiation,

or

other

hazards,

Production

Safety

is

continuously

under

review

and

new

instructions

are

issued

from

time

to

time.

For

the

latest

information,

always

consult

the

current

HITACHI

Service

Manual.

A

subscription

to,

or

additional

copies

of

HITACHI

Service

Manual

may

be

obtained

at

a

nominal

charge

from

HITACHI

SALES

_~

CORPORATION.

CAUTION

The

following

symbol

near

the

fuse

indicates

fast

operating

fuse

to

be

replaced.

Fuse

ratings

appear

within

the

symbol.

Example:

we

The

rating

of

fuse

F901

is

5.0A-125V.

Replace

with

the

same

type

fuse

for

continued

protection

against

fire.

(POWER

SOURCE

)

This

television

receiver

is

designed

to

operate

on

120

volts/60Hz,

AC

house

current.

Insert

the

power

cord

into

a

120

volts/60

Hz

outlet.

NEVER

CONNECT

THE

TV

TO

OTHER

THAN

THE

SPECIFIED

VOLTAGE

OR

TO

DIRECT

CURRENT.

Use

of

this

TV

set

in

50

Hz

areas

will

not

harm

the

TV

set.

It

will

only

cause

the

time

which

appears

on

the

screen

to

be

delayed

when

used

in

a

50

Hz

area.

Consult

service

personnel

if

you

move

to

an

area

where

the

power

supply

frequency

is

50

Hz.

TECHNICAL

SPECIFICATIONS

ANTENNA

INPUT

IMPEDANCE............

75Q

(300Q)

POWER

INPUT

..........5.cceceeeeeeeen

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60Hz

CHANNEL

COVERAGE

POWER

RATINGS

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155W

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155W

CATV

MID

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145W

A-1

CONVERGENCE

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Convergence

SUPER

BAND

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Electrostatic

HYPER

BAND

............

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PICTURE

TUBE

ULTRA

BAND

............

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-

W+89

27TAX4B/CT32

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CHANNEL

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A68KSA30X

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INDICATOR

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INTERMEDIATE

FREQUENCY

SPEAKER

.......ceceeeeeeene

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2

Speakers

(60

x

120mm)

Picture

1-F

Carrier

.........

45.75MHz

SOUND

OUTPUT

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3W

x2

Sound

1-F

Carrier

.........

41.25

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Sound

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TECHNICAL

CAUTIONS

High

voltage

limiter

circuit

operation

check

4.

Connect

the

high

voltage

voltmeter

between

the

CPT

anode

terminal

(anode

cap)

and

ground

as

shown

in

the

diagram.

.

Set

the

AC

input

voltage

to

120

+

3V.

_

Receive

the

broadcast

signal

and

set

the

picture

level

and

the

black

level

to

maximum.

Adjust

the

screen

VR

and

sub

brightness

VR

so

that

beam

current

is

1.50

+

0.1mA.

(The

voltage

at

ABL

terminal

of

FBT

-

between

both

ends

of

C734

-

should

be

12V

or

less

at

this

time.)

4.

Check

that

the

constant

high

voltage

is

27.5

+

1kV

for

27AXOB

and

28.0

+

1kV

for

27A3/4B

at

this

time.

;

5.

Set

the

AC

input

voltage

to

100

+

5V

and

then

short

circuit

both

ends

of

R906.

6.

Leave

the

setting

of

the

picture,

black

level

and

screen

VRs

as

in

item

(3)

and

gradually

increase

the

AC

input

voltage.

Check

that

the

picture

disappears

when

the

high

voltage

is

31.6kV

+

1.2kV

for

27A3/4B

and

31.3kV

+

1.2kV

for

27AXOB.

7.

Turn

the

switch

of

the

set

off

immediately

after

checking

that

the

picture

disappears.

WP

High

voltage

voltmeter

CPT

Anode

(DC

voitage

divider)

Use

the

voltmeter

which

can

indicate

up

to

the

first

decimal

point,

with

an

input

impedance

of

10M

or

more.

Digital

voltmeter

CPT

Ground

wire

Less

than

42V

Short

circuit

i

MAIN

P.W.B.

WAVEFORMS

AT

EACH

SECTION

Numbers

inside

circles

correspond

to

locations

shown

in

the

circuit

diagram.

(5)

IC

201

18

(9)

IC201

23

ee

ale

REF

sas

TRACK

MORE

WAVEFORMS

AT

EACH

SECTION

Numbers

inside

circles

correspond

to

locations

shown

in

the

circuit

diagram.

(13)

Q651

emitter

(17)

Q750

base

(21)

Between

C726

and

L711

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Hitachi 27AX4B/C732 User manual

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