Technics RS-CH770 User manual

ORDER

NO.

AD9603056C8

Service

Manual

Stereo

Cassette

Deck

Cassette

Deck

System:

SC-CH770

[DOLBY

|*’

*2.*3

§B-CH770

*2,*3

SB-PC10

*2.*9

SB-CH770

ST-CH770

SL-CH770

Colour

(K)

Black

ySBPSIO

poe

Suffix

for

Area

Colour

Model

No.

Europe,

Asia,

Latin

America,

Middle

East,

Africa

and

Oceania

*2,*3

SB-PS10

RS-CH770

SE-CH770

Remote

Control

Transmitter

System:

SC-CH570

*2.*3

§B-CH570

*2.*3

SB-PC570

*2.*3

SB-CH570

$B-PS570

*2$B-PS570

*1:

Dolby

noise

reduction

manufactured

under

license

from

Dolby

Laboratories

Licensing

*3SB-PS10

gai?

SB-PS10

Corporation.

as,

“Dolby”

and

the

double-D

symbol

are

trade

marks

Doiby

Laboratories

Licensing

Corporation.

Remote

Control

Transmitter

RS-CH770

SE-CH570

AR-2

MECHANISM

SERIES

Specifications

(IH

78)

Frequency

response

(Dolby

off)

TYPE

(NORMAL)

Hz-1

kHz

(DIN)

Cassette

Deck

Section

TYPE

(HIGH)

Hz-1

kHz

(DIN)

Deck

system

Stereo

cassette

deck

TYPE

(METAL)

Hz-1

kHz

(DIN)

Track

system

4-track,

2-channel

S/N

(signal

level

max

recording

level,

TYPE

type

tape)

Recording

system

bias

off

weighted)

Bias

frequency

100

kHz

Dolby

weighted)

Erasing

system

erase

Input

sensitivity

and

impedance

Heads

REC

(IN)

400

mV/23

DECK

Playback

head

(Permalloy)

Output

voltage

and

impedance

DECK

Recording/Playback

head

(Permalloy)

x 1

PLAY

(OUT)

280

mV/360

Erasing

head

(Double-gap

ferrite)

General

Motors

: ;

DECK

Capstan

drive

(DC

servo

motor)

Dimensions

270

118.5

269.5

Tape

speed

4.8

cm/sec.

weelant

1.9

Wow

and

flutter

0.16%

(WRMS)

Notes:

Fast

forward

and

rewind

times

Specifications

are

subject

change

without

notice.

Approx.

110

seconds

with

C-60

cassette

tape

Weight

and

dimensions

are

approximate.

Tuner/sound

Compact

disc

System

processor

player

Amplifier

Cassette

deck

Front

speakers

Center

speaker

Surrournd

speakers

SC-CH770

ST-CH770

SL-CH770

SE-CH770

¥2.*3SB-CH770

*2°°SB-PC10

*°°3

SB-PS10

SB-PT570

SC-CH570

ST-CH570

SL-CH570

sE-cH5s70

CH770

s2s358.cH570

“SB-PCS70

*2SE3-PS570

*3SB-PT570A

SB-PC570

“8S

B-PS10

For

Europe

area:

oo...

Made

PAES

Except

for

Europe

area:

.....

Made

NABEL

1996

Matsushita

Electric

Indusiriaal

Co.,

Ltd.

All

rights

reserved.

Unauthorized

©pying

]

and

distribution

violation

law.

RS-CH770

A\WARNING

This

service

information

designed

for

experienced

repair

technicians

only

and

not

designed

for

use

the

general

public.

does

not

contain

warnings

cautions

advise

non-technical

individuals

potential

dangers

attempting

service

product.

Products

powered

electricity

should

serviced

repaired

only

experienced

professional

technicians.

Any

attempt

service

repair

the

product

products

dealt

with

this

service

information

anyone

else

could

result

serious

injury

death.

Location

of-

Controls

iscetei

hick

aie

eee

eisai

etanariann

Cotas

aks

Wiring

Connection

Diagram

Operation

Check

and

Function

oflG

Terminals:

23,

ccecsse.cscesecesdauseavivesctds

tice

vals

aan

Main

Component

Replacement

Procedures

0...

eee

3~12

Block

Diagram

.......ccceeccseetseetereee

Service

Mode

Function

Cassette

Mechanism...

13,14

Replacement

Parts

List

Measurements

and

Adjustments

........

cece

ecceceeeerserecteeetiieens

15~17

Cabinet

Parts’

Location

iin.

ii.

itie

ities

aude

eens

neinarieaGane

Schematic

Diagram

occ

erect

eeseeeereees

Mechanism

Parts

Location

Printed

Circuit

Board

Diagram

uo...

cece

cererrseeeeeetsereeeens

NOTE:

Refer

the

service

manual

for

Model

No.

SE-CH770

(ORDER

No.

AD9603055C8)

SE-CH570

(ORDER

No.

AD9603054C8)

for

information

“Accessories”,

“Stacking

the

Components”,

“Connections”

and

“Packaging”.

Location

Controls

G@)

Deck

cassette

holder

Deck

indicator

(DECK

Deck

1/deck

select

button

(DECK

1/2)

(4)

Reverse

mode

select

button

(REV

MODE)

()

Deck

cassette

holder

Dolby

noise

reduction

button

(DOLBY

NR)

Record

pause

button

REC

PAUSE)

Record

pause

indicator

(REC

PAUSE)

Deck

indicator

(DECK

Deck

cassette

holder

open

button

OPEN)

Counter

reset

button

(RESET)

42)

Counter

display

button

(DISPLAY)

Fast

forward/rewind/tape

program

sensor

buttons

(<<,

>>)

Playback

buttons

and

indicators

(<1,

>>)

@®

Stop

button

(0)

Tape

edit

buttons

(TAPE

EDIT,

NOR,

HIGH)

Deck

cassette

holder

open

button

OPEN)

RS-CH770

OPERATION

CHECKS

AND

MAIN

COMPONENT

REPLACEMENT

PROCEDURES

This

section

describes

procedures

for

checking

the

operation

the

major

printed

circuit

boards

and

replacing

the

main

components.

For

reassembly

after

operation

checks

replacement,

reverse

the

respective

procedures.

Special

reassembly

procedures

are

described

only

when

required.

Select

items

from

the

following

index

when

checks

replacement

are

required.

illustrated

screws

are

equivalent

actual

size.

Refer

the

parts

No.

the

page

“Main

Component

Replacement

Procedures”,

necessary.

Contents

*Checking

Procedure

for

each

P.C.B.

Page.

Checking

for

the

main

P.C.B.

and

power

supply

P.C.B..sseeeceeecceecccsccccccccccescsecescvses

34.

Checking

for

the

operation

P.C.B..

Coo

omer

eererererereseesereoesreesereenecseneseseeeeeoer

56,

«Main

Component

Replacement

Procedures

Replacement

for the

cassette

lid

ass'y,

eereecereccccsccsescesescccssesceseseeseesesvvcsvoce

Replacement

for the

cassette

holder,

s*eeecercsccsccrvecvereeccccveesesesesesesesesesecesenes

Replacement

for

the

motor

ass’y,

capstan

belt

and

winding

belt.

sesercerreseeccceercesccscscveeeeeee

8.44,

Replacement

for the

plunger

ass’y

and

the

parts

mounted

mechanism

P.C.B..

seeececerceeesesccevess

14.42,

Replacement

for

the

head

block

and

pinch

roller

ass’y.sseesecceccesccsvccsscsscessscescsecsceve

Checking

Procedure

for

each

P.C.B.

Checking

for

the

main

P.C.B.

and

power

supply

P.C.B.

Remove

the

top

cabinet.

Cup

@x4

()\

(Black)

[RHD30007

K1]

(ID

Black)

[XTBS3+8JF-Z1]

RS-CH770

Remove

the

flat

cable

from

connector.

Release

the

claws,

and

then

remove

the

front

panel

ass’y.

Connector

(CN901-—1/CNS01—2)

Main

P.C.B.

Connect

the

flat

cable

the

connector.

Connector

(CN6O1A)

Release

the

claws,

and

then

remove

the

power

supply

P.C.B..

Socket

(CN601B)

Power

supply

P.C.B.

step

Connect

the

socket

(CN601B)

the

connector

(CN601A).

Check

the

main

P.C.B.

and

power

supply

P.C.B.

shown

below.

Main

P.C.B.

istep

10)

Connect

the

lead

wire.

Cabinet

Place

the

power

supply

P.C.B.

the

insulation

material

not

short-circuit

the

solder

side

power

supply

P.C.B..

(i)

(Black)

[XTBS3HJFZ1]

RS-CH770

Checking

for

the

operation

P.C.B.

Press

the

eject

rod

the

direction

arrow,

and

then

open

the

cassette

holder.

the

@eamp

the

item

checking

procedure

for

each

P.C.B.

pages

and

Cassette

holder

(DECK1)

Cassette

holder

(DECK2)

Remove

the

shield

plate

(L)

(R).

Shield

plate

(L)

Shield

plate

(R)

Release

the

claw,

and

then

remove

the

mechanism

unit.

Remove

the

cassette

lid

ass’y

the

direction

arrow.

Cassette

lid

ass'y

(DECK1)

Cassette

lid

ass’y

(DECK2)

Release

the

claws.

(SID

(Black)

[XTB3+1

OJFZ]

(3)

‘bY

[XTBS26+10J]

RS-CH770

Remove

the

deck

mecha

frame

the

direction

arrow.

Remove

the

operation

P.C.B..

Operation

P.C.B.

Connect

the

flat

cable

the

connector.

Connector

(CN601A)

Socket

(CN601B)

Power

supply

P.C.B.

Connect

the

socket

(CN

601B)

the

connector

(CN6(4A).

Check

the

operation

P.C.B.

shown

below.

Operation

P.C.B.

Connect

the

lead

wire

NOTE

Place

the

power

supply

P.C.B.

the

insulation

material!

not

aes

short-circuit

the

solder

side

GND

plate

power

supply

P.C.B..

Cabinet

eae

RS-CH770

Main

Component

Replacement

procedures

Replacement

for

the

cassette

lid

ass’y

the

G2aD

GED

the

item

checking

procedure

for

each

P.C.B.

page

Cassette

holder

(DECK2)

Cassette

holder

(DECK1)

Press

the

eject

rod

the

direction

arrow,

and

then

open

the

cassette

holder.

Eject

rod

Remove

the

cassette

lid

ass’y

the

direction

arrow.

Cassette

lid

ass'y

(DECK1)

(RYF0412-K]

Cassette

lid

ass'y

(DECK2)

[RYF0413-K]

Replacement

for

the

cassette

holder

the

G&D

GEEED

the

item

checking

procedure

for

each

P.C.B.

pages

and

Open

spring

installation

the

ZUR

the

item

checking

Cassette

holder

ass'y

procedure

for

each

P.C.B.

pages

and

(DECK1)

[RFKLACH430GA]

Cassette

holder

ass

(DECK2)

——,

[RFKLACH430GB]

Release

the

lug

Cassette

holder

the

direction

arrow.

RS-CH770

Replacement

for

the

motor

ass’y,

capstan

belt

and

winding

belt

the

@25ED

GREED

the

item

checking

procedure

for

each

P.C.B.

pages

and

the

G&D

the

item

checking

procedure

for

each

P.C.B.

page

Mechanism

P.C.B.

aun

qs,

NOTE

Handle

the

connector

)

;

with

care

that

When

removeing

the

LTS:

shape

terminals

mechanism

control

P.C.B.,

;

toe

Rae

nae

different

from

others.

remove

with

holding

the

mechanism

P.C.B.

finger.

Unsolder

the

terminals.

Release

the

claw,

and

then

remove

the

main

P.C.B..

The

illustration

below

shows

DECK2

mechanism.

For

DECK1

mechanism,

perform

the

same

procedure

DECK2.

Remove

the

sub

chassis.

Head

connector

€

its

Remove

the

P.C.B.

support.

ex)

;

(se)

ump

ra)

Release

the

claws,

and

then

remove

the

head

connector.

XTBS26+8]

f)ump

XTW26+10S]

RS-CH770

@)p

[RHD26022]

Motor

ass'y

[REM0055]

Capstan

belt

[RDV0034]

Remove

the

flywheel

Winding

belt

[RDV0033-1]

Release

the

calws,

and

then

step

remove

the

winding

belt

and

Remove

the

flywheel

SPN9-

Put

the

winding

belt

the

flywhe

Veh

The

boss

and

marking

should

positioned

horizontally.

lywheel

Winding

belt

Tweezers

Install

the

flywheel

NOTE

Take

care

not

stick

the

grease

onthe

belt.

Put

the

winding

belt

the

pulley

temporarily.

RS-CH770

The

winding

lever

should

positioned

shown

below.

Winding

lever

Capstan

belt

(Side

view)

Winding

arm

Install

the

winding

lever

and

spring

while

pressing

the

winding

arm

the

direction

arrow.

(The

winding

lever

must

inserted

completly

and

latched

with

claws.)

Put

the

capstan

belt

temporarily

shown

below.

dss

505:

Boss

Capstan

belt

Install

the

sub

chassis

the

mechanism,

and

then

tighten

screws.

Mechanism

~10-

@)mm

[XTW226+10S]

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