Technics SA-CH750 User manual

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1

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Service

Manual

Tuner

Amplifier

Tuner

Amplifier

SA-CH750

Colour

eFor

(E),

(EB),

(EG)

areas

SL-CH750

SH-CH750

Remote

Control

Transmitter

+

|

(Kyi

cent

acces

Black

Type

Areas

Suffix

for

Model

No.

Colour

SB-CH750A/CH755

RS-CH750

SA-CH750

SB-CH750A/CH755

eFor

(GC),

(GN)

areas

Great

Britain

Remote

Control

SL-CH750

SH-CH750

Germany

and

Italy

(k)

Transmitter

Asia,

Latin

America,

Middle

Near

East

and

Africa

Oceania

System:

SC-CH750

SB-CH750

RS-CH750

SA-CH750

SB-CH750

Because

of

unique

interconnecting

cables,

hen

a

component

requires

service,

send

r

bring

in

the

entire

system.

SPECIFICATIONS

(DIN

45

500)

ie

ee

Fe

ows,

@

Main

Amp.

Section

Power

output

DIN

1

kHz

THD

1%

both

channel

driven

For

(GC),

(GN)

areas

SFP,mode1kHzTHD1%

_

[toevn

nail

AN

TUNER

SECTION

MAIN

|

Eee

NEE

ncy

range

SURROUND

2x5

W

(8Q)

MW

Total

harmonic

distortion

For

(E),

(EB),

(EG),

(GN)

areas

522-1611

kHz

(9

kHz

steps)

Rated

power

at

1

kHz

1%

(6)

530-1620

kHz

(10

kHz

steps)

Half

power

at

1

kHz

0.09%

(6Q)

For

(GC)

area

531-1602

kHz

(9

kHz

steps)

Load

impedance

530-1600

kHz

(10

kHz

steps)

MAIN

6-80

LW

SURROUND

8

For

(E),

(EB),

(EG),

(GN),

areas

9

144~—288

kHz

Q

kHz

steps)

S/N

(rated

power)

84

dB

For

(GC)

area

153-279

kHz

@

kHz

steps)

Frequency

response

40

Hz—30

kHz

(—3

dB)

Sensitivity

(S/N

20

dB)

MW

500

uVv/m

m@

FM

Tuner

Section

LW

50

uV

Frequency

range

87.50

MHz—108.00

MHz

(0.05

MHz

steps)

Sensitivity

1.8

pV

(IHF,

usable)

@

Timer

Section

S/N

26

dB

1.5

yV

(75Q)

Clock

Quartz-lock

type

S/N

Function

24-hour

programmable;

Play

trmer

(1

time)

MONO

70

dB

(75

GB,

IHF)

Rec

trmer

(1

time)

Stereo

separation

at

1

kHz

35

dB

Sleep

(120

min.

1

min.

intervals)

Antenna

terminal(s)

75Q

(unbalanced)

Setting

1

minute—23

hours

59

minutes

(1

min.

intervals)

Sound

processor

|

Tuner

amplifier

|

Compact

disc

player

|

Cassette

deck

Speakers

*SB-CH750A

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

(E),

(EB),

(EG)

areas

SC-CH750

SH-CH75'

SA-CH750

SL-CH750

RS-CH750

*SB-CH795

cesccds

2

esate

aa

Baytthes

Switzerland

only

SB-CH750

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

(GC),

(GN)

areas

*Magie

in

PAES

Technics

2

“SA-CHT750

|

™@

GENERAL

Dimension

(WxHxD)

270119334

mm

Power

consumption

175W

Weight

5.5kg

Power

supply

For

(E),

(EG)

areas

AC

50/60

Hz,

230

V

Notes:

For

(EB),

(GN)

areas

AC

50/60

Hz,

230

V-240

V

1.

Specifications

are

subject

to

change

without

notice.

For

(GC)

area

AC

50/60

Hz,

110/127/220/240

V

2.

Weight

and

dimensions

are

approximate.

3.

Total

harmonic

distortion

is

measured

by

the

digital

spectrum

|

co

NTE

NTS

analyzer.

Page

Page

@BEFORE

REPAIR

weci5

Sa

cds

eee

eee

ts

as

bee

SO

2

@SCHEMATIC

DIAGRAM

............002

20

ce

cee

eee

14~22

e@PROTECTION

CIRCUITRY

..........

2.00.

e

eee

eee

eee

2

ePRINTED

CIRCUIT

BOARD

DIAGRAM................

23~27

@ACCESSORIES............

00.

cece

cece

eee

eee

reer

eeeee

2,3

e@WIRING

CONNECTION

DIAGRAM

.............00000

eee

28

@LOCATION

OF

CONTROLS

.....

1.

eee

eee

3,4

@BLOCK

DIAGRAM.............

0.00

c

ccc

een

eee

29~31

e@STACKING

THE

COMPONENTS

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

000

cece

eee

5

@FUNCTION

OF

IC

TERMINALS

...............000..0

0000s

32

@CONNECTIONS

.........

2

cece

eee

ne

eeee

6~9

@REPLACEMENT

PARTS

LIST

..............0.000

eee

33~38

e@SETTING

THE

TIME

OF

DAY

.........

0.0

cece

eee

eee

9

e@CABINET

PARTS

LOCATION

.............-

0.0.

eee

eee

e

eee

39

e@DISASSEMBLY

INSTRUCTIONS

.................04.

10~13

@PACKAGING

....

0.

cece

cece

cence

teen

ne

eeeneeatens

40

m@

BEFORE

REPAIR

(1)

Turn

off

the

power

supply.

Using

a

10Q,

10

W

resistor,

connect

both

ends

of

power

supply

capacitors

(C701,

C702)

in

order

to

discharge

the

voltage.

(2)

Before

turning

the

power

supply

on,

after

completion

of

repair,

slowly

apply

the

primary

voltage

by

using

a

power

supply

voltage

controller

to

make

sure

that

the

consumed

current

at

50/60

Hz

in

NO

SIGNAL

mode

is

mode

should

be

shown

below

with

respect

to

supply

voltage

230

V/240

V.

Power

supply

voltage

AC

230

V

AC

240

V

Consumed

current

50

Hz

130~230

mA

110~210mA

m@

PROTECTION

CIRCUITRY

The

protection

circuitry

may

have

operated

if

either

of

the

following

conditions

is

noticed:

“No

sound

is

heard

when

the

power

is

switched

ON.

*Sound

stops

during

a

performance.

The

functions

of

this

circuitry

is

to

prevent

circuitry

damage

if,

for

example,

the

positive

and

negative

speaker

connection

wires

are

“shorted”,

or

if

speaker

systems

with

an

impedance

less

than

the

indicated

rated

impedance

of

this

unit

are

used.

If

this

occurs,

follow

the

procedure

outlined

below:

1.

Switch

OFF

the

power.

2.

Determine

the

cause

of

the

problem

and

correct

it.

3.

Switch

ON

the

power

once

again.

Note:

When

the

protection

circuitry

functions,

the

unit

will

not

operate

unless

the

power

is

first

switched

OFF

and

then

ON

again.

|

ACC

ESSORI

ES

Check

the

packing

carton

for

these

accessories.

(RJA0019-2K)

for

(E),

(EG),

(GC)

areas

(VJA0733)

for

(EB)

area

(SJA173)

for

(GN)

area

ie

ieee

Hong

Mei

See

daca

hee

Ae ee

1

pe.

eSurround

speaker

cords.

...

0.2.0...

cece

ee

eee

eee

2

PCS,

(RJL1P001B25)

for

(GC),

(GN)

areas

(RAK-SC709WH)

Note:

These

are

available

on

sale

route.

Remote

control

transmitter...

2.2.

eee

eee

1

pe.

Remote

control

batteries

UM-4,

AAA,

RO3

2...

eee

2

pcs.

eFlat

cable

@Antenna:holder-2.:

2304-4

e

a

shateaies

f4

Rs

eee

ea

SES

1

pe.

(SPB1163T)

(RSA0007)

for

(E),

(EB),

(EG)

areas

(RSA0006)

for

(GC),

(GN)

areas

(SWXS257M)

e@Speaker

cords

2.0.0.0...

ec

cee

eee

2

pcs.

m@

LOCATION

OF

CONTROLS

@

Power

“STANDBY

(5/ON”

switch

(POWER,

STANDBY

(/ON)

This

switch

switches

ON

and

OFF

the

secondary

circuit

power

only.

The

unit

is

in

the

“standby”

condition

when

this

switch

is

set

to

the

STANDBY

©

position.

Regardless

of

the

switch

setting,

the

primary

circuit

is

always

“live”

as

long

as

the

power

cord

is

connected

to

an

electrical

outlet.

@)

Timer

play

button

({

PLAY)

Press

to

confirm,

exit

or

reset

the

play

timer.

@)

Timer

recording

button

(]

REC)

Press

to

confirm,

exit

or

reset

the

record

timer.

|

SA-CH750

O”

&

(XTN3+10AFZ)

e@Mounting

screws

..

0...

ee

eee

2

pcs.

eAttachment

plug

.........

2.0...

eee

ee

eee

1

pe.

(SJP9009)

for

(EB)

area

&

&y

(SJP5213-2)

for

(GC)

area

e@Power

plug

adaptor...............

0.0000

eee

eee

eee

1

pe.

Note:

The

configurations

of

AC

power

supply

cord

and

FM

indoor

antenna

differ

according

to

area.

VOLUME

=eesece

savor

OO

eee

©

Volume

level

control

(VOLUME)

Turn

to

adjust

the

volume

level.

Note

that

—-

dB

is

the

lowest

volume

setting

and

0

dB

is

the

highest.

©

Input

select

buttons

(TAPE,

CD,

TUNER,

DAT,

VCR,

VDP,

PHONO)

Press

to

select

the

sound

source.

©

Remote

control

signal

sensor

(SENSOR)

Receives

the

signals

from

the

remote

control.

@)

Headphones

jack

(PHONES)

(23.5,

32)

Piug

headphones

cord

into

this

jack.

SA-CH750

Clock/timer

button

(CLOCK/TIMER)

Press

to

select

the

clock

set

mode

or

desired

timer

mode.

©)

Timer

select

buttons

(WV

SELECT

A)

Use

when

setting

the

current

time

and

timer.

Setting

button

(SET)

Press

to

set

the

present

time

in

the

clock

mode,

or

set

the

various

selection

in

the

timer

mode.

@})

Preset

memory

button

(MEMORY,

-MANUAL,

—AUTO)

Press

to

put

a

broadcast

station

into

the

memory.

(2)

Band

select/allocation

change

button

(BAND,

-BAND

—ALLOCATION)

Press

to

select

the

MW,

LW

or

FM

radio

band.

Press

and

hold

to

change

the

MW

frequency

step.

@®

Preset

tuning

buttons

(WV

PRESET

A)

Use

to

select

channel

number

for

a

broadcast

station

which

has

been

stored

in

the

tuner’s

memory.

Tuning

buttons

(WV

TUNING

A)

Use

to

tune

in

a

desired

broadcast

station.

The

functions

indicated

by

the

numbers

with

black

background

(for

example

@)

can

also

be

activated

from

the

remote

control.

eDisplay

section

@)

©

‘

Qa®

@

@ @

SUNMON

TUE

WED

THUFRISATISLEEP

|

IpGyVCH

VDE*

VOLUME

Faccc=ri

(YEG

TOPLAYION

OFF"

QUARTZLOCK

=bqSMqx

TRAC!

TaOPT

Wn

tres

MEMO

CH

=.

=

“ahd

LLP

LIA

ALT

ALE

WA

aie

(=)

=;

=

|=

Sh

on

a

oo

co

EE

Sk

ae

0)

3)

@

2)

@

a8)

Q9

(5)

Timer

mode

indicators

(©

REC,

[

PLAY)

[4]

REC:

Lights

when

you

have

set

the

record

timer

mode.

[4

PLAY:

Lights

when

you

have

set

the

play

timer

mode.

Day

indicators

(SUN-SAT)

Shows

the

day

of

the

week

or

the

day

the

timer

has

been

set

for.

(7?)

Sleep

timer

indicator

(SLEEP)

Lights

when

you

have

set

the

sleep

timer

mode.

Timer

on/off

indicator

(ON,

OFF)

Lights

together

with

the

setting

time

to

show

the

timer

ON

time

and

OFF

time.

BGV

(background

visual)

indicator

(

)

Lights

when

listening

to

audio

sound

source.

@0)

Visual

source

indicators

(VCR,

VDP)

Lights

to

show

it

is

possible

to

enjoy

BGV

(Back

Ground

Visual)

if

you

connect

video

deck

or

video

disc

player

to

this

system.

@)

Quartz

lock

indicator

(QUARTZLOCK)

Lights

when

you

precisely

tune

in

a

broadcast

station.

@2)

Volume

level

display

(VOLUME,

MAX,

MIN)

Shows

the

volume

level.

@3)

FM

STEREO/MONO

indicator

(MONO,

STEREO)

“STEREO”

lights

when

an

FM

stereo

broadcast

is

being

re-

ceived.

If

you

press

FM

mode

button

on

the

remote

control

to

select

monaural

mode,

“MONO”

lights.

®

Aipha-numeric

display

Shows

the

selected

source,

present

time,

and

the

contents

of

the

timer

setting,

received

frequencies,

volume

level.

Memory

indicator

(MEMO)

Lights

when

the

preset

memory

button

is

pressed.

Preset

channel

display

Shows

the

preset

channel

you

select.

Channel

indicator

(CH)

Lights

when

the

unit

is

in

the

preset

tuning

mode.

Balance

display

(L,

R,

BALANCE)

Shows

the

left-right

volume

balance.

®

®

©

©

©

Muting

indicator

(MUTING)

Lights

when

you

activate

the

muting

mode.

SA-CH750 SA-CH750

m

CONNECTIONS

m

STACKING

THE

COMPONENTS

Install

the

various

components

as

shown

below.

@

Horizontal

stacking

©The

terminals

for

surround

speaker

cords

(5)

are

only

for

(GC),

(GN)

areas

For

(E),

(EB),

(EG)

areas

Place

both

speakers

so

that

the

tweeter

comes

outward.

(Back

of

product)

{Komponentens

bagside)

(Produktets

bakside)

CLASS

1

[fa

|

LASER

PRODUCT

T_]

LUOKAN

14

LASERLAITE

KLASS

1

LASER

APPARAT

Right

speaker

SL-CH750

Compact

disc

player

SH-CH750

Sound

processor

SH-CH750

SL-CH750

Bs

@

Vertical

stacking

SH-CH750

Sound

processor

Cassette

deck

Tuner

amplifier

SB-CH750A

RS-CH750

SA-CH750

or

SB-CH755

SA-CH750

Tuner

amplifier

SL-CH750

Compact

disc

player

For

(GC),

(GN)

areas

Place

both

speaker

so

that

the

surround

speaker.

comes

outward.

Right

speaker

RS-CH750

Cassette

deck

SL-CH750

SH-CH750

Compact

disc

player

Sound

processor

©

eoo

=

=

|

|S

1

Connect

the

fiat

cable.

2

Connect

the

FM

indoor

antenna.

Install

the

antenna

on

a

wall

at

a

height

and

in

a

direction

Connecting

Disconnecting

which

result

in

the

best

reception.

Cassette

deck

Tuner

amplifier

SB-CH750

a

oa

=)

:

=

Adhesive

tape

RS-CH750

SA-CH750

——

FM

indoor

antenna

PANT,

(included)

Hold

the

connector

with

the

recessed

part

up

and

press

in

at

@

Left

speaker

For

(E),

(EB),

(EG)

areas

the

center

until

you

hear

a

click.

First

connect

the

blue-colored

connector

to

the

terminal

of

the

@

Television

set

(not

included)

®

This

system

sound

processor

(A),

then

connect

the

rest

in

the

order

B,

C,

D.

Route

the

cable

horizontally

(underneath

the

heat

outlet

grille)

so

that

the

side

with

the

white-color

lead

is

positioned

at

the

front.

After

connection,

fold

and

press

the

cable

as

flat

to

the

back

of

the

unit

as

possible.

Led

The

tip

of

the

internal

antenna

wire

should

not

come

into

contact

with

any

metal

objects.

When

you

cannot

get

a

good

reception

with

this

FM

indoor

antenna,

we

recommend

you

install

an

FM

outdoor

antenna

(not

included).

Disconnect

the

FM

indoor

antenna

if

you

install

an

FM

outdoor

antenna.

Heat

outlet

grille

Do

not

try

connecting

or

disconnecting

the

flat

cable

while

the

power

is

switched

to

ON.

To

produce

a

better

stereo

sound,

install

both

speakers

away

from

the

system.

;

This

speaker

system

has

built-in

surround

speaker,

so

you

can

Surround

sound

effect

differs

according

to

where

you

install

the

easily

enjoy

the

surround

sound.

surround

speakers.

Install

them

as

you

like.

=5-

m6

3

Connect

the

LW/MW

loop

antenna.

1.

Attach

the

antenna

holder

with

screws

(included)

to

the

rear

panel

of

the

sound

processor.

2.

Clamp

the

antenna

to

the

antenna

holder

and

connect

the

antenna

terminal

to

the

rear

panel

of

the

tuner

amplifier.

3.

Position

the

loop

for

the

best

reception.

You

may

attach

the

LW/MW

antenna

holder

to

a

rack

or

other

structure.

Notes:

To

minimize

noise

pickup,

keep

the

LW/MW

loop

antenna

away

from

the

speaker

cable,

power

cord,

and

metal

sur-

faces.

For

better

reception,

keep

the

LW/MW

loop

antenna

cord

along

the

heat

outlet

grille,

and

away

from

the

flat

cable.

Antenna

Connection

of

speaker

cables

1.

Strip

off

the

outer

covering,

and

twist

the

center

conductor.

Make

sure

the

bare

ends

of

the

wires

are

not

unraveled.

(If

they

are,

twist

them

tight

again.)

3.

Insert

the

wire

to

the

rear

panel

of

the

tuner

amplifier,

and

close

the

lever.

Notes:

©To

prevent

damage

to

circuitry,

never

short-circuit

positive

(+)

and

negative

(—)

speaker

wires.

eBe

sure

to

connect

only

positive

(red)

wires

to

positive

(+)

terminals

and

negative

(black)

wires

to

negative

(—)

terminals.

Note:

Be

sure

to

connect

speaker

cables

before

connecting

the

AC

power

supply

cord.

2.

Insert

the

wire

to

the

rear

panel

of

the

speakers,

and

then

pull

»>

down

the

lever.

SA-CH750

5

Connect

the

surround

speaker

cord.

For

(GC),

(GN)

areas

Rear

panel

of

Rear

panel

of

the

Tuner

amplifier

the

speakers

6

Connect

the

AC

power

supply

cord

after

you

have

connected

all

other

cables

and

cords.

Insertion

of

Connector

Even

when

the

connector

is

per-

fectly

inserted,

depending

on

the

type

of

inlet

used,

the

front

part

of

the

connector

may

jut

out

as

shown

in

the

drawing.

However

there

is

no

problem

using

the

unit.

Connector

Approx.

6

mm

Appliance

inlet

@

External

unit

connection

Surround

speaker

Tuner

amplifier

Right

speaker

Left

speaker

(not

included)

(not

included)

Notes:

Install

each

speaker

left

and

right

at

the

back

of

the

listening

space.

Be

sure

to

connect

both

speaker

systems.

If

only

one

side

is

connected,

no

sound

will

be

heard.

SA-CH750

Television

Television

set

(not

included)

Video

connection

cable

(not

included)

Sound

processor

Center

speaker

for

(GC),

(GN)

areas

Tuner

amplifier

CONTROL

Monaural

L-type

cable

connection

(not

included)

cable

(not

included)

Center

speaker

(not

included)

(with

the

function

of

amplifier)

Household

AC

outlet

AC

power

supply

cord

Note:

When

you

use

a

center

speaker

which

has

not

a

built-in

amplifier,

connect

it

to

an

another

amplifier.

Video

deck

Hi-Fi

video

deck

(not

included)

AUDIO

VIDEO

AUDIO

VIDEO

INPUT

=INPUT

OUTPUT

OUTPUT

(R)(L) (R)(L)

a6

ba

St

Video

connection

peaeags

cable

(not

included)

cable

Al

8

(R)(L)

(R(L)

(not

included)

Sound

processor

When

you

use

a

monaural

video

deck,

connect

it

with

monaural

video

connection

cable.

Analog

player

Analog

player

(not

included)

OUTPUT

=

R)

(L)

Stereo

connection

cable

(not

included)

)

3

(L)

Sound

processor

“GND”

terminal

This

terminal

is

for

a

ground

wire

use.

DAT

(digital

audio

tape

deck)

DAT

(not

included)

ANALOG

INPUT

OUTPUT

Oo

©

(R)

(L)

(RR)

(L)

Stereo

connection

cable

(not

included)

(R)

(tL)

(R)

(L)

DAT

PLAY

(IN)

Sound

processor

@

SETTING

THE

TIME

OF

DAY

1

24-68

3°5°/

These

instructions

explain

how

to

set

the

time

for

16:25

(4:25

p.m.)

on

Wednesday.

Switch

on

the

power.

1

Press

CLOCK/TIMER

to

select

‘“‘CLOCK”’.

The

display

will

show

CLOCK.

The

display

will

return

to

what

was

previously

indicated

if

you

allow

7

or

more

seconds

to

elapse

before

you

accomplish

the

next

operation.

2

Press

SET.

The

day

indicator

will

start

to

flash.

SA-CH750

Video

disc

player

Video

disc

player

(not

included)

AUDIO

VIDEO

OUTPUT OUTPUT

(R)

(L)

Video

connection

cable

(not

included)

Stereo

connection

cable

(not

inlucded)

Sound

processor

3

Press

one

of

the

SELECT

buttons

to

select

“WED’’.

Flashing

Press

SET.

Press

one

of

the

SELECT

buttons

io

select

“4

6’’.

Going

from

23:59

to

00:00

on

the

hour

display

willnot

change

the

day

display.

ak

6

Press

SET.

7

Press

one

of

the

SELECT

buttons

io

select

95”

Going

from

59

to

00

on

the

minute

display

will

notchange

the

hour

display.

cio

—<$_—

8

Press

SET

to

finish

setting

the

time.

After

about

2

seconds,

the

display

will

return

to

vhat

it

were

before

entering

the

clock

setting

mode.

To

display

the

clock

again,

press

CLOCK/TIMER.

Thedissplay

will

show

“CLOCK”,

and

then

clock

will

appear

for

5

secons,

“E”

appears

on

the

display

if

the

power

cord

has

been

oicee

discon-

nected

or

there

has

been

a

power

failure.

If

this

happen,

reset

the

time.

SA-CH750

|

m@

DISASSEMBLY

INSTRUCTIONS

“ATTENTION

SERVICER”

Some

chassis

components

may

have

sharp

edges.

Be

careful

when

disassembling

and

servicing.

Removal

of

the

Cabinet

Ec

Removal

of

the

Front

Panel

Ass’y

1

Cabinet

1.

Remove

the

5

screws

(@~@).

1.

Remove

the

3

screws

(@~@).

2.

Remove

the

cabinet

in

the

direction

of

arrow.

2.

Remove

the

front

panel

ass’y

in

the

direction

of

arrow.

Main

volume

knob

1.

Pull

out

the

main

volume

knob.

2.

Remove

the

nut.

Removal

of

the

Rear

Grill

Ass’y

Procedure

154

Rear

grill

ass'y

2.

Remove

the

2

ribs.

1.

Remove

the

9

screws

(@~@).

3.

Remove

the

rear

grill

ass’y

in

the

direction

of

arrow.

~10-

SA-CH750

SA-CH750

Removal

of

the

Headphones

Jack

Ref.

No.

Removal

of

the

Input/outout

Terminal

Removal

of

the

Fan

Ass’y

Ref.

No.

Removal

of

the

main

P.C.B.

P.C.B.

6

P.C.B.

12

Procedure

Procedure

Procedure

12535

124-6

3971112

Main

P.C.B.

Flat

cable

Fan

ass'y

»)

e

Hol

|

Headphones

jack

P.C.B.

npuvoutput

terminal

P.C.B.

1.

Remove

the

connector

(JK351).

2.

Remove

the

input/output

terminal

P.C.B.

in

the

direction

of

1.

Remove

the

connector

(JK351).

2.

Remove

the

3

screws

(@~@).

_

|

1.

Remove

the

4

screws

(@~@).

arrow.

2.

Remove

the

flat

cable

(J703-1,

J703-2).

Ref.

No.

Removal

of

the

AC

Input

Terminal

Ref.

No.

Removal

of

the

Power

Transformer

7

P.C.B.

and

Tuner

P.C.B.

8

P.C.B.

(A)

m=

NOTE

[Bottom

view]

elnsert

the

projection

on

the

Procedure

Procedure

Procedure

|

swhen

checking

the

soldered

surfaces

of

angle

into

the

hole

of

the

Projection

1457

1-2-8

|

©

132411

Remove

the

headphones

jack

P.C.B.

in

the

direction

of

arrow.

main

P.C.B.

and

replacing

the

parts,

do

as

bottom

board

ass'y

and

then

ZN

313

shown

below.

install

the

Main

P.C.B.

4

4

:

A

Power

transformer

Tuner

P.C.B.

P.C.B.

(A)

m@

Removal

of

the

AC

input

Terminal

P.C.B.

1.

Remove

the

2

screws

(@,

@).

Remove

the

AC

input

terminal

P.C.B.

in

the

direction

of

arrow.

2.

Release

the

claw.

3.

Remove

the

2

ribs.

m@

Removal

of

the

tuner

P.C.B.

4.

Remove

the

power

transformer

P.C.B.

(A)

in

the

direction

of

@

Remove

the

tuner

P.C.B.

in

the

direction

of

arrow.

arrow.

Ref.

No.

Removal

of

the

Power

Transformer

Ref.

No.

Removal

of

the

Power

Transformer

9

P.C.B.

(B)

10

Procedure

1529

Flat

cable

3.

Remove

the

rib.

1.

Remove

the

4

screws

(@~Q@).

4.

Remove

the

main

P.C.B.

in

the

direction

of

arrow.

Front

panel

ass'y

-

~

a

r

\

LL

g

;

=

~

>

a

W

G.N.D.

terminal

.

7

.

|

‘Bp

—

he

'

n

;

“a>

3

in

PC.B.

.

Power

transformer

>.

SS

CZ

Ss»

s

P.C.B.

(B)

PSsZ

Bottom

board

ass'y

1.

Remove

the

flat

cable

(J703-1,

703-2).

SF

Femer

manetomet

4.

Connect

the

G.N.D.

terminal

to

the

bottom

board

ass’y

by

2.

Release

the

2

claws.

the

lead

wire.

3.

Remove

the

power

transformer

P.C.B.

(B)

in

the

direction

of

2.

Remove

the

rib.

5.

Reinstall

the

front

panel

ass’y

to

the

input/output

terminal

arrow.

e

Remove

the

4

screws

(Q@~@).

3.

Remove

the

main

P.C.B.

in

the

direction

of

arrow.

P.C.B.

his

DS

SA-CH750

SA-CH750

|

sformer

sformer

sformer

et

Removal

of

the

Fan

Ass’y

ee

Procedule

Procedure

une:

13246

37311512

Removal

of

the

main

P.C.B.

Main

P.C.B.

Flat

cable

Fan

ass'y

1.

Remove

the

connector

(JK351).

2.

Remove

the

3

screws

(@~®).

1.

Remove

the

4

screws

(@~@).

2.

Remove

the

fiat

cable

(J703-1,

J703-2).

m

NOTE

elnsert

the

projection

on

the

angle

into

the

hole

of

the

Projection

bottom

board

ass'y

and

then

AAs

install

the

Main

P.C.B.

[Bottom

view]

Procedure

eWhen

checking

the

soldered

surfaces

of

19234511

main

P.C.B.

and

replacing

the

parts,

do

as

shown

below.

3.

Remove

the

rib.

4.

Remove

the

main

P.C.B.

in

the

direction

of

arrow.

1.

Remove

the

4

screws

(Q@~@).

Input/output

terminal

P.C.B.

Front

panel

ass'y

Bottom

board

ass'y

4.

Connect

the

G.N.D.

terminal

to

the

bottom

board

ass'y

by

the

lead

wire.

§.

Reinstall

the

front

panel

ass'y

to

the

input/output

terminal

P.C.B.

2.

Remove

the

rib.

3.

Remove

the

main

P.C.B.

in

the

direction

of

arrow.

a

ee

SA-CH750

Removal

of

the

Power

IC

and

14

Regulator

Transistor

Procedure

1324-6

37311312514

1.

Unsolder

the

power

IC

or

regulator

transistors.

2.

Remove

the

3

screws

(@~@).

Regulator

transistor

e

When

mounting

the

power

IC

or

regulator

transistor,

apply

silicone

compound

(RFKX0002)

to

the

rear

side

of

power

IC

or

regulator

transistors.

poe

|

Removal

of

the

Fan

Ass’y

Procedure

13511515

Fan

ass'y

Fig.1

2.

Insert

a

screwdriver

at

the

root

of

the fan

(shown

in

Fig.

2).

3.

Remove

the

cap

(shown

in

Fig.3).

4.

Remove

the

motor

from

the fan

case

(shown

in

Fig.

4).

5.

When

mounting

the

motor,

align

the fan

case

projection

with

the

hole

of

the

motor

(shown

in

Fig.5).

1.

Release

the

3

claws

(shown

in

Fig.

1).

@

Replacement

of

the

Foot

1.

Remove

the

4

heat

melted

posts

on

the

Bottom

board

ass'y

with

a

pair

of

nippers

or

similar

tool.

2.

To

replace

the

foot

(RKA0055-N)

on

the

Bottom

board

ass'y

,

melt

the

4

posts

with

a

soldering

iron.

Heat

melted

posts

pee

ae

Foot

Bottom

board

ass'y

ea

Foot

(RKAOO55-N)

2432