Hitachi CMT2988-981 Bedienungsanleitung

HITACH!|

CMT2988

-051

SERVICE

MANUAL

-081

PALISECAMINTSG

AIPLSChassis

NICAM

TELETEXT

981

owe)

TO.

adapter

=oat

[o@a

[oO

USERRA

OLN,

BIEN

ROAM

MERRIE

“RAS

LATA)

BIR”

“SARE

LAER”

PER.

CAUTION:

Before

servicing

this

chassis,

important

that

the

service

technician

read

the

‘Safety

Precau-

tion”

and

“Product

Safety

Notices”

this

service

Manual.

CONTENTS

ABUZZ

LAUPER

ccereeteeeee

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tee

ees

Safety

precautions

..........ssessserevereneeesers

ABW

BLS

BOTE

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Product

safety

notice

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Technical

cautions

.........:.:ssereereeeeeseerers

FARR

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cece

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Technical

specifications

.......sserrrerees

BBB

Bec

ereccec

tees

teeeeerteereeeseneeeannerees

Main

features

..........:..ceseeeeneeeeeeeereseeees

Names

controls

........essecccesseeseeseeeeees

Bee.

Remote

control

unit

......0.:cssseseeeeeeeeeeeees

ASABE

eee

cece

teeeeeeeeeeeenernneeeeeeseneeteenees

Wiring

diagram

.......ccccsecseeseecetceneesceeees

FRAC

RAUB]

cccceeeeceeeeeereeeereeneeneeeeeetens

Basic

circuit

diagram

............+:sessereeeee

EYURU

ccecceeceee

cee

eeeececeteeeeetereeteees

Printed

wiring

board

..........++0esesseeeeeees

ARTE

eec

cceeceeeneaeeeteererseees

renee

Replacement

parts

list...........cseeeseereeeee

ARERR,

RASERANS

ALR

RM.

SPECIFICATIONS

AND

PARTS

ARE

SUBJECT

CHANGE

FOR

IMPROVEMENT

Bite

COLOUR

TELEVISION

September

1992

Consumer

Electronics

Division

CMT2988

ARMAELHRARR

BG:

(FS

ESE

HE,

LAA

ASS

FRG

PARED

as,

BRE

WAGE

ITA

BIR

Bese

BAR

FaVPA

RRR

AAT

BSE,

BUR

EER

ERERA

HBS

Se,

AR.

FESR

AVIS,

7).

BM]

PA,

AREAS ERD

RRS

PARE

ZARB

RRS

Ree.

BA BB

AMV,

HEBD

ELE

BERRISHE—

(ie

Bik

MTHS

TUTE

RT,

PETRIE

HEA

BR,

LAR

FEZ

ACHR,

SREB

ibe

SSS

RAAT

LAT,

BRS

EERE,

LAER

BERR,

ICEBAR

ARES

ERAS

eRe

Uae

REM

Hes

BB,

BBA

RRR

TUT

SRR

LRA

CRRA

EIZS

fib

BEE

ERA

ANP)

SSB

CTL

ELIE

FEB

FF).

FEE

URE

FRAY

TAC

ay)

RES,

AST

Pia

BLE

HUGE:

ss ah

PRAT

XR,

BEBO

UREA

ES.

Arse

RAT

widacat,

ARR.

ReARARDH

REE

IL,

BEACH

—~

BURE

REA

RRL

BIA

ERO

EPRRGHRER

MLLER,

ERR

RAS31

SFR,

MRT

BRR

HDRES

BRE

HED

7c)

pc)

{RHS31.

KR.

Rian

Ein

ARE

BER,

(

—

)

Siig

sm,

(AF)

SEER

Rem

(BeBe

PRR)

EPS

LUA,

HERR

Bl.

AMS

BRELHERRA

Bl,

SiR

RIS

ERMERE,

SSR

TMERE

LEST

MR,

ELEN

PEt

RFE

FY]

RBIS

ETRE

ERE

(38

KIRIE

AEE

AAAS

KOREA,

FESS

ARSE

ATHY

EPA

BRAD

BSS

HE.

HORS

FASE

ABS

_LHITACHI

ArH

TEI

«AERA

ea,

RAL

SB,

HITACHI

S482

225

BME,

EOE

HOLMES,

USER

Ree

HHITACHIMMSEA,

WiaHITACHIS8

ZTSUR

ARISE,

es,

CMT298%

BBR

LAER

SIA

SRRARERNRE

$#SERERAREERRARREGE

(BRE)

MGR

ASSES

PTR

ADA

LEE

RES

TAP

rae

Heth

(BA

REE

BR)

ZT.

EHIME,

TERA

132K,

FEHR

ERE,

LEE

STR

EIR,

JENNA

IRE

€RRK,

HET

RERRER

735

(KEL

MRIS.

1.458232

+10%

SERRE

RRS

)

SERRE

RREAMY.

Ascii

RSE

«132+

31K,

Bim

LER

RRR

EET,

PRS

—

e288

.741.0F

KR.

—

ISAS

EPA

(SERGEY

ee)

BrbAeeS

URBSEA,

PPR

RAE

ExCCE

RM,

ARS

ERCR

bik

RO71L

AP,

ATA.

RO71

Jig

e—wW—

R969

vRg51

ERD

15KQ

50KO-B

Jig

Hig

wees

MERER

HRIBZE

[

RARIR

~~]

7SEKME

(AS2E

HpZ!

)

625-(8

B.G/I/D-K/H

PAL,

A68KRT370X

B.G/D.K/K’

SECAM

13cm

6em

(

NTSC50

idles

Peres

PUR

525-feR

~M/NTSC

aa.

NTSC3.58-5.5/6.0/6.5

seit

125

x24

10K

NTSC

4.43-5.5/6.0/6.5

BEE

1101K/1274K/2201K

50/60

PAL60

cia

ike

220KK-240K

50/60AiR

(F4-081

)

6B)

CCIR

E2~12,

E21~69,

Bon

ACG

01~3,

S1~10,

$11~20

ARR

180H.

[ies

OIRT

R1~12,

R21~69

(4A)

45.0

47036

~96sIbak/

Ji~12,

13~62

US2~13,

J~W,

BK)

14~69

76.0X59.0X49.5

Sie,

KB:

UK21~69

(BEX

XR)

Hoy

C1~12,

C13~57

UOETERE

TBE

ELAR

ASEMSRERSEE

BRR

RRR

_—3—

CMT2988

SBMBRAMAR

—4—

PABA

BRE

Semis

TIMER

(sempiantet

Haale

ISU

Edd

(58

FBR

)

ETE

O;]oO!)

NT Mi

on]

—

}

OO]

—

HRA

ray

RiRaR

Stig

roa

iw)

FERRO

stig

—

ORB

S38

IN/OUT

(Ree

TSR

)

Sede

Shi

Bisset

lel

(RATA

Ol,

oOInNI

RD]

oa]

aie

fan)

cae

[Sn

Cn Tn

SRR

ASSETS

SRA

RRS

#A®TELETEXT

BPH

see

RRB

BARRE

SAFETY

PRECAUTIONS

WARNING:

Since

the

chassis

this

receiver

connected

one

side

the

Mains

Supply

during

operation,

service

should

not

attempted

anyone

unfamiliar

with

the

precautions

necessary

when

working

this

type

equipment.

The

following

precautions

should

observed.

not

install,

remove,

handle

the

picture

tube

any

manner

unless

shatter-proof

goggles

are

worn.

People

not

equipped

should

kept

away

while

picture

tubes

are

handied.

Keep

picture

tube

away

from

the

body

while

handling.

When

replacing

chassis

the

cabinet,

all

the

protective

devices

are

put

back

place,

such

as;

barriers,

non-

metallic

knobs,

adjustment

and

compartment

cover

shields,

isolation

resistors-capacitors,

etc.

When

service

required,

observe

the

oritinal

lead

dress.

Extra

care

should

taken

assure

correct

lead

dress

the

high

voitage

circuitry

area.

Always

use

the

manufacturer's

replacement

component.

Especially

critical

components

indicated

the

circuit

diagram

should

not

replaced

other

makes.

Furthermore

where

short

circuit

has

occurred,

replace

those

components

that

indicate

evidence

overheating.

Before

returning

serviced

receiver

the

customer,

the

service

technician

must

thoroughtly

test

the

unit

certain

that

completely

safe

operate

without

danger

electrical

shock,

and

sure

that

protective

device

built

into

the

instrument

the

manufacturer

has

become

defective,

inadvertenly

defeated

during

servicing.

Therefore,

the

following

checks

are

recommended

for

the

continued

protection

the

customers

and_

service

technicians.

INSULATION

Insulation

resistance

between

the

mains

poles

and

any

accessible

metal

parts

should

not

less

than

7MQ.

500V

DC.

Also,

flashover

breakdown

should

occur

during

the

dielectric

strength

test,

apply

4KV

for

one

minute

between

the

mains

poles

and

any

accessible

metal

parts.

X-RADIATION

TUBES:

The

primary

source

radiation

this

receiver

the

picture

tube.

The

tube

utilized

this

chassis

specially

constructed

limit

radiation.

For

continued

radiation

protection,

the

replacement

tube

must

the

same

type

the

original,

HITACHI

approved

type.

CMT298&

High

Voltage

This

receiver

provided

with

hold

down

circuit

for

clearly

indicating

that

voltage

has

increased

excess

predetermined

value.

Comply

with

all

notes

described

this

Service

Manual

regarding

this

hold

down

circuit

when

servicing,

that

this

hoid

down

circuit

operated

correctly.

Serviceman

warning

With

minimum

Black

Level

and

Picture,

the

operating

high

voltage

this

receiver

lower

than

31.5kV.

case

any

component

having

influence

the

high

voltage

replaced,

confirm

that

high

voltage

with

minimum

Brightness

and

contrast

lower

than

31.5kV.

measure

H.V.

use

high

impedance

H.V.

meter.

Connect

(—)

chassis

earth

and

(+)

the

CRT

anode

button.

(See

the

following

connection

diagram).

NOTE:

Turn

the

power

switch

off

without

fail

before

the

connection

the

Anode

button

made.

CRT

ANODE

HIGH

IMPEDANCE

H.V.

METER

CHASSIS

GROUND

PRODUCT

SAFETY

NOTICE

Many

electrical

and

mechanical

parts

HITACHI

television

receiver

have

speciai

safety

characteristics.

These

characteristics

are

often

not

evident

from

visual

inspection

nor

can

protection

afforded

them

necessarily

obtained

using

replacement

components

rated

for

higher

voltage,

wattage,

etc.

Replacement

parts

which

have

these

special

safety

characteristics

are

identified

this

Service

Manual.

Electrical

components

having

such

features

are

identified

marking

with

mark

the

schematics

and

the

replacement

parts

fist

this

Service

manual.

The

use

substitute

replacement

component

which.

does

not

have

the

same

safety

characteristics

the

HITACHI

recom-

mended

replacement

one

shown

the

parts

list

this

Service

Manual,

may

create

electrical

shock,

fire,

radiation,

other

hazards.

Product

Safety

continuously

under

review

and

new

instructions

are

issued

from

time

time.

For

the

latest

information,

always

consult

the

current

HITACHI

Service

Manual.

subscription

to,

additional

copies

of,

HITACHI

Service

Manuai

may

obtained

nominal

charge

from

your

HITACH!

SALES

CORPORATION.

SMT2988

TECHNICAL

CAUTIONS

High

voltage

limiter

circuit.

operation

check

anode

(anode

cap)

and

GND

(CPT

grounding

lead).

Receive

the

broadcast

signal

and

set

the

brightness

and

contrast

VRs

max.

Set

the

beam

current

1.15mA

10%

:CMT2528

1.45mA+10%

CMT2928

(After

cut-off

adjustment)

Set

the

input

voltage

132-13V.

Check

that

the

constant

high

voltage

28.7£1.0kV

this

time.

Turn

the

switch

the

set

off

and

connect

the

jig

shown

Fig.

both

ends

R971

shown

Fig.

Power

Supply

P.W.B.

CPT

Earth

Wire

Connect

the

high

voltage

voltmeter

between

the

CPT

D.C

Voltage

Divide

With

the

brightness

and

contrast

VRs

left

set

item

and

with

the

input

voltage

stabilized

132V,

turn

the

set

and

increase

input

voltage

and

check

that

the

picture

disappears

with

high

voltage

35.0kV

less.

Turn

the

switch

the

set

off

immediately

after

the

check

completed.

Remove

the

adjust

jigs

and

high

voltage

voltmeter.

Note:

When

connecting

disconnecting

the

high

voltage

voltmeter

from

the

anode

cap,

sure

turn

the

switch

the

set

off

and

after

the

residual

high

voltage

discharged

the

chassis

because

the

high

voltage

may

remain

the.

anode

cap.

eo—_w—e

R969

vrgs1

Fig.

15KQ

50KO-B

Jig

Digital

Voltmeter

Fig.

Specifications

B.G/I/D.K/H_

PAL

B.G/D.K/K’

SECAM

NTSC50

M/NTSC

NTSC3.58-5.5/6.0/6.5

NTSC4.43-5.5/6.0/6.5

PAL60

625-lines

Reception

system

525-lines

Hong

Kong,

U.K.

UK21~69

China

:C1~12,

C13~57

CCIR

:E2~12,

E21~69,

01~3,

S1~10,

S11~20

Channel

coverage

|OIRT

:<R1~12,

R21~69

{Frequency

range

JAPAN

J1~12,

J13

~62

hea

U.S.A.

US2~13,

J~W,

470MHz~863MHz

US14~69

Aerial

input

Color

picture

tube

75Q

unbalanced

type

A68KRT370X

13cm

X6cem(X

12cmX6em(X

6cm

4cm(X

12WX2+10W

AC110V/127V/220V

50/60Hz

AC220V—240V

50/60Hz

(—081

only)

Speaker

Sound

output

Power

supply

180W

45.0

Power

consumption

Weight

(kg)

Dimensions

WXHXD

(cm)

Country

manufacture

76.0X59.0X49.5

Japan

Specifications

are

subject

change

without

notice

improve

performance.

Main

Features

Advanced

full

function

remote

control

system

Front

video

input

terminals

CMT2988

Names

controls

Program

up/down

button

External

speaker

select

switch

IN/OUT

terminals

Remote

control

transmitter

Power

ON/OFF

Input

select

Programme

selecter

Dynamic

noise

Program

up/down

reduction

Mute

Volume

up/down

Sound

mode

TV/VTR

select

Exclusive

VTR

buttons

;

A~N

shows

the

key

function

Teletext

mode.

shows

the

key

function

Sound

multiplex

mode.

CMT2988

WIRING

DIAGRAM

(vy)

(gO

COP

Yay

aaNoR

Vv.

uve

PIG

}

WIRE

CRAMP15

ripe)

(

Lay

FURIE

CPT

P.W.B

: |

”

fem

RAR

;

fil)

FEB

eelEnmI

esARD

sesinaresaE

ASB

all

Power

Output

P.W.B

FOMEAMAAEK,

463

PHEBAY

Bind

the

wires

the

connector

using

tie-band

that

the

wires

not

touch

the

terminals

the

power

ihe

SAG

cuaak.

RES

ana]

EBL

Perform

wiring

without

touching

the

heat

sink.

174

Bea

Perform

wiring

along

the

connector.

$£

7542

PRE]

Basic

CIRCUIT

DIAGRAM

BURR

AEM:

MMA

REBEL

ALE

ALATA

OUT

TRE

HE,

UCT

MALES,

AMINA

AERIS

MASE

LAER”

—

EH,

B/N

Ly,

ARE

(IRB

EAE,

- ©

RENN

GENOMES

menemeennens

NANT

MAIN

P.W.B

31)>—~<

~V.P

2/3

csoa2

0.01

26)—<¢

23)>—<

OUT

nav?

100

1/ow

R875

100

1/ew

100

1/6

SECAM

05010

2863413

Qa84

2801514

)

casi

100/16

(ea)

1/0

P.w.

©)

Re?!

390

1/8

cape

129

REE?

180

t220)}

@63

1/ew

100

CPT

P.W.B.

~5004

205002-500.

23)

PAL

1/0

P.W.B.

(ec]

I/D

P.W.B-

SHARP

e316

100/162

307

A339

9.001

Soe

185270

33P/7500

8701

2803413

100

)

POWER

Ww. 6B.

A798

160

14/2)

20795

HZS6C2

100/25

1/0

P.Ww.8.

scales

Ral

eta:

R1375

1.2%

ft)

250673)

R1374

C1330

5604.

7780

A1378

1/ou

BP.

18K

SRNNNONNNNSCNI

CRRAMERARBM,

RUHEtEHE,

SICA

AHS

yew),

soft

A a

BEE

(

100KQ

/V)

BIS.

CRSA

AIR

EEABERER.

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