Toshiba Sc-m15 User manual

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M135

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SC—M15

|

CONTENTS

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DIAGRAM

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OPERATING

CONTROLS

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FRONT

VIEW

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REAR

VIEW

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3.

DISASSEMBLY

INSTRUCTIONS

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4

BOTTOM

PLATE

REMOVAL

62st

cau

ra

See

aneee

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ee

es

4

MAIN

P.C.

BOARD

REMOVAL..............05-

ee

ye

ee

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Rmdeiane

4

POWER

TRANSFORMER

REMOVAL..........-200ccceeeeeees

sp

tee

tt

Saher

4

SUPPLY

P.C.

BOARD

REMOVAL

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

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4

A.

ADJUSTMENTS

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34

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ww

aeta

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..5to

6

NEUTRAL

POTENTIAL

ADJUSTMENT

......

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2

Beutel

Lobe

eeo

use

nee

IDLE

POWER

ADJUSTMENT:

1.35.04:

42404%

seadeesew

Qavbvaneae

ees

a

tees

5

CHECKING

PROCEDUSE

OF

MAIN

P.C.

BOARD............00c

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5

to

6

WIRING

REARRANGEMENT

..........

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6

5

SCHEMATIC

DIAGRAM

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wis

haan

tbl

7

6.

P.C.

BOARD

PARTS

LOCATIONS............05:

Sait

ea

apne

tet

ent

he

taht

8

to

9

BOTTOM

VIEW

OF

MAIN

P.C.

BOARD........

000

c

cece

eee

eens

Pere

ae

8

BOTTOM

VIEW

OF

POWER

SUPPLY

P.C.

BOARD..............

t

asuien

ree

Gadi:

x

9

7.

CABINET

PARTS

LOCATIONS

..........006.

bets

eos

Se

J

Vag

Salts

an

atic

vn

Gk

10

8

‘PARTS

UIST

<2

32

er

attack

ate

oe

oan

ee

ae

hae

11

to

12

1.

BLOCK

DIAGRAM

Phase

reversal

circuit

for

BTL

|

r

|

>]

ee

ang

CT

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eae

es

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|

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BTL

|

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INPUT

:

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|

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Europe

Australia

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:

England

AC240V

3

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2.

OPERATING

CONTROLS

FRONT

VIEW

Cooling

fins

|

These

fins

effectively

dissipate

the

heat

generated

by

the

output

transistors.

.

*

These

fins

become

fairly

hot

after

the

set

has

been

operated

continuously

for

an

extended

period

of

time.

Therefore,

ample

caution

must

be

exercised

when

carrying

or

|

otherwise

handling

the

set.

Speaker

selector

push-button

BTL

switch

:

|

_

Two

push-buttons

correspond

to

the

speaker

This

switch

is

used

when

the

amplifier

is

terminals

on

the

rear

panel.

used

as

a

monaural

amplifier.

Select

according

to

the

speaker

system

|

arrangement

being

used.

|

_

Figure

2.

|

REAR

VIEW

|

Main

Speaker

Connection

Right

Channel

Left

Channel

Sub

Speaker

Connection

3

Pre

Out

Figure

3.

SC—M15

3.

DISASSEMBLY

INSTRUCTIONS

BOTTOM

PLATE

REMOVAL

We

1.

Remove

4

Screws

(1).

See

figure

4.

2.

Remove

the

bottom

plate

from

the

set.

¥¢@

Screw

(Tapping)

3¢

x

8mm

MAIN

P.C.

BOARD

REMOVAL

|

Figure

4.

1.

Remove

the

Bottom

Plate.

See

figure

4.

2.

Set

the

Power

switch

to

“ON”

position

and

3

Push

switches

to

“OFF”

positions.

CAUTION:

Do

not

apply

power.

3.

Unsolder

12

pins

of

Transistors

(0617,

0618,

0619,

Q620)

from

the

Main

P.C.

Board.

See

figure

5.

4.

Remove

2

screws

(2)

securing

Diodes

at

both

sides.

See

figure

6.

5.

Remove

4

screws

(3)

securing

P.C.

board

and

slide

the

P.C.

Board

backward.

See

figure

6.

Remove

the

Main

P.C.

Board

from

the

set.

.

Bush

Switches

|

Power

Switch

ea

td

Transistor

:

Pins

Q)

Screw

3¢

x

8mm

Figure

5.

POWER

TRANSFORMER

REMOVAL

39

x

8mm

1.

Remove

the

Bottom

Plate

and

Main

P.C.

Board.

See

figures

4

and

5.

2.

Remove

4

screws

(4)

securing

Power

Transformer

and

its

Bracket.

See

figure

7.

|

Sao

| |

4¢

x

8mm

SUPPLY

P.C.

BOARD

REMOVAL

Rs

ae

ere

|

1.

Remove

the

Bottom

Plate,

Main

P.C.

Board

and

Power

Transformer.

See

figures

4,

5

and

6.

2.

Remove

6

Screws

6).

See

figure

7.

3.

Remove

the

Supply

P.C.

Board

from

the

set.

Bracket

Supply

P.C.

Board

Figure

7.

4.

ADJUSTMENTS

NEUTRAL

POTENTIAL

ADJUSTMENT

1.

Push

the

Speaker

selector

push-button

A

with

the

Power

switch

“ON”.

2.

Connect

the

DC

voltmeter

to

speaker

terminal

A

and

check

the

meter

oscillation

is

kept

within

from

+20mV

to

—20mV.

See

figure

8.

3.

When

the

voltage

deviates

from

the

above

scope,

adjust

Semi-fixed

resistors

of

R651

(Rch.

)

and

R652

(Leh.

)

with

screwdriver.

Note:

Be

careful

not

to

short-circuit

the

pattern

with

screwdriver

during

adjustment.

DC

Voltmeter

Speaker

Terminal

Figure

8.

IDLE

POWER

ADJUSTMENT

1.

Connect

the

DC

voltmeter

to

the

both

terminals

of

R645

(Rch.)

and

R646

(Lch.)

and

check

the

meter

oscillation

is

kept

within

from

1mV

to

2mV.

See

figure

9.

|

2.

When

the

voltage

deviates

from

the

above

scope,

adjust

the

Semi-fixed

resistors

R653

(Rch.)

and

R654

ae

with

screwdriver.

Note:

The

adjustment

should

be

made

one

minute

later

after

turning

the

power

on.

Be

careful

not

to

short-circuit

the

pattern

with

screwdriver

during

adjustment.

CHECKING

PROCEDUSE

OF

MAIN

P.C.

BOARD

BACK

1.

After

removing

the

Bottom

plate,

unsolder

the

12

(3

x

4)

pins

of

4

power

transistors

(Q617,

618

...

2S5D718,

0619,

620

...

2SB688)

from

the

Main

P.C.

Board

and

solder

4

pcs

of

100

ohm

%W

resistor

(22563101)

between

emitter

and

base

on

the

pattern

at

four

points.

See

figure

9.

Caution:

The

pins

of

the

four

transistors

unsoldered

should

be

fell

toward

radiator

Sa

away

from

the

P.C.

board.

Never

apply

power

before

attaching

the

resistors.

2.

Apply

power

and

keep

the

Power

switch

all

the

way

in

ON

position.

To

check

the

neutral

potential,

make

sure

that

the

voltage

is

kept

within

from

+20mV

to

—20mV,

connecting

the

speaker

terminal

to

DC

voltmeter.

DC

Voltmeter

|

Speaker

Terminal

Figure

10.

3.

Voltage

from

19V

to

22.4V

(GAIN

from

25

dB

to

27

dB)

on

the

speaker

terminal

is

normal

when

applying

~1kHz,

1V

(0

dBV)

sine

wave

to

the

Input

terminal

at

none

speaker

load.

Signal

Generator

Ss

AC

Voltmeter

1

kHz/1V

|

Input

‘Speaker

19V

~

22.4V

(0

dBV)

Terminal

Figure

11.

WIRING

REARRANGEMENT

Caution:

Failure

of

this

rearrangement

may

results

in

bad

distortion

in

high-pass.

After

fixing

the

P.C.

board

and

soldering

the

power

transistors,

rearrange

the

wiring

as

figure

12.

ay

:

t

{|

|

a

eh

Mini-connector

8P

Lead

~

(bring

to

the

left

as

ae

2

Core

Shield

Mini-connector

10P

Lead

(bring

to

the

right

as

possible)

(place

close

to

speaker

terminal

Earth

ead

(brown)

and

bottom

plate

as

possible)

(place

close

to

speaker

terminal

as

possible)

Figure

12.

Bottom

View

ee

eee

~SC-M15

—-

SC—-M15

5.

SCHEMATIC

DIAGRAM

R609

39K

2$C2240-BL

2SA949-Y

2SC1I624-Y

R631

C6I7

pee,

20

l00P

100

49.8V

|

3.

;

R6

58

C60I

|

C603

C607

2k

—

((@3BV]

Wou

sso!

|

PAG3H

$R507

|

3

waen

Oe

:

56K

6502

OSD

OSSD

ES

ERASED

SOROS

SIT

SNAICC

OSSD

SEITE

SSD

COIS

SS

SSS

‘Main

PC.

Board

270

E

8

2SA949

2SA970

2S5C2088

29C2229

2SC

2240

|

:

i

4

|

:

|

0604,606

|

;

3

:

5128C2240-BL

2SA949-Y

| |

yh

ell

25495

<

D910v

912

~

SEL301E_

:

2SA8

14

oS

|

2SA839

C

1624

—

0901

2SC1669-Y

5

8C

l669

a

Lo

0902

2$A

8

39-Y

a

oO

~

162Z1

1G2Cl_

[ex0v)

NOC

=

s

LLJ

=

Europe

Model

_

Europe

Model

_

O

Australia

_

ene

F901

|

“”)

i

pp

se

4

Poet

tay

LE

gee

fll

Poppi

HH-490Vi

pgp

kh

oC

Peo

i.

boa

“nss

OC

R/O

UT

ITO

a

eR

RR

ee

—

AC220v,

:

2SB688

eeetaen:

OT

OO

ee

|

2SD718

!

|

i

_

—

4700P/250_

z

R657

|

601

|

W

Fi

|

(een

,

:

|

UU

|

ices

|

:

eine

Rs

Ong

er

iJcoo

|

18K

220K

$

22/10

,

AC240V

3

|

,

4700P/250V

)

|

7]

11.25V|

ae

|

~-4

F90I

l

eee

3

|

GIL

2sav25ov1

|

4700R/250V

|

England

|

Australia

Mode!

|

eee

ry

S5Olavd

Push

Switch

(OT)!

Sere

OFF

Position

R

ch.

Signal

Path

| 0904.907

02718A

{

2.

$80!

Push

Switch

(SPEAKER

A)---

ON

Position

““"

L

ch.

Signal

Path

)

9905,

906

RODSSE

R075

7

C9I6

|

3.

$802

Push

Switch

(SPEAKER

B)--

ON

Position

,

|

:

8K

33/50

{4

$803

Relay

Switch

|

Ba

ee

ie

—

5

$804

—

Relay

Switch

-

6.

$90

Push

Switch

(POWER)

-----

OFF

Position

Figure

13.

BOARD

PARTS

LOCATIONS

P.C.

BOTTOM

VIEW

OF

MAIN

P.C.

BOARD

Main

RC.

Board.

To

Main

PC.

basta

445V

DV

{1.2.vi

WHT

_{YEL

{BLK

JBLKf

7

&

0}

O

Speaker

Terminal

SC-M15

SC—M15

6.

P.C.

BOARD

PARTS

LOCATIONS

To

Supply

RC.

board

To

Speaker

Terminal

To

Supply

PC.

Board

a

ae

».

Figure

14.

SC—M15

7.

CABINET

PARTS

LOCATIONS

BOTTOM

VIEW

OF

POWER

SUPPLY

P

C.

BOARD

30|

AIOPUOIBS

JBWJOJSUDJ]

JAMOY

O}

yXxA

ZO

OMS

INId

ds

P41D0g

“Od

IDI

OL

SID

00g

“Dd

Ajddns

Main

PC.

Board

Excluded

parts

in

the

Power

Switch

NOTE

:

Parts

List

are

not

available

as

replacement

parts.

Figure

16.

Figure

15.

Symbol

No.

CABINET

PARTS

|

8.

PARTS

LIST

Symbol

No.

SC—M1!

ELECTRICAL

PARTS

301

22844123

|

Chassis

(Europe)

TT

22223276

|

Transformer,

Power

(Europe)

22844156

|

Chassis

(England/Australia)

22223289

|

Transformer,

Power

(England/

302

_

22874046

|

Leg,

Bottom

Plate

Australia)

303

22843625

|

Cap,

Decoration,

Large

J101

22162431

|

Terminal,

Speaker

304

22843626

|

Cap,

Decoration,

Small

J501

22163701

|

Jack,

US

PIN,

Input

307

22824264

|

Knob,

Speaker/BTL

J601

22163676

|

Jack,

Headphone

308

22824266

|

Knob,

Power

$501,

801,

22195181

|

Switch,

Push,

Speaker/BTL

309

22705020

|

Rivet,

3¢

x

4.5mm

802

| : |

310

©

22705022

|

Rivet,

3¢

x

5.5mm

$803,

804

22148124

|

Relay

|

311

25844035

|

Bushing,

Power

Cord

$901

22195318

|

Switch,

Push,

Power

313

22864193

|

Badge,

AUREX

F901

22144372

|

Fuse,

2.5A/250V

315

22707327

|

Screw

(BID),

34

x

8mm,

Tapping

|

22165074

|

Holder,

Fuse

316

22702138

|

Speed

Nut,

3¢

|

22176286

|

Cord,

Power

(Europe)

317

22707165

|

Screw

(BID),

34

x

10mm

22176536

|

Cord,

Power

(England)

318

22864239

|

Label,

Caution

22176588

|

Cord,

Power

(Australia)

TRANSISTORS,

ICS

AND

DIODES

Q501

912

22114583

|

Transistor,

uRA63H-M-L/M

CAPACITORS

ey

ee

J=+5%,

K

=+10%,

M=+20%,

Z=-20+80%

0502,

503,

Transistor,

2SA495-TM.Y

|

.

504

| |

C501

22380078

|

Polystyrene

Film,

22pF,

J,

125V

0601,

602

22114583

|

Transistor,

uPA63H-M-L/M

C502

22380078

|

Polystyrene

Film,

22pF,

J,

125V

Q603,

604

Transistor,

25C2240-BL

C503

22448100

|

Electrolytic,

1Omfd,

50V

Q605,

606

Transistor,

2S5C2240-BL

C601,

602

22370208

|

Metalized

Polyester

Film

(V

Q607,

608

Transistor,

2SC2240-BL

|

Type)

Imfd,

K,

250V

Q609,

610

Transistor,

2SA949-Y

C603,

604

22448100

|

Electrolytic,

1O0mfd,

50V

0611,

612.

Transistor,

25C2229-Y

C605,

606

22388471

|

Polystyrene

Film,

470pF,

K,

125V

0613,

614

Transistor,

2SC1624-Y

JA

C607,

608

22388561

|

Polystyrene

Film,

560pF,

K,

125V

0615,

616

Transistor,

2SA814-Y

JA

C609,

610

22380065

|

Polystyrene

Film,

15pF,

J,

125V

0617,618

Transistor,

2SD718-O-R/O

C611,

612

22371104

|

Mylar,

0.1mfd,

J,

50V°

0619,

620

Transistor,

2SB688-0-R/O

C613,

614

22448100

|

Electrolytic,

10mfd,

50V

Q801

IC,

TA7317P

C617,618

|

22388101

|

Polystyrene

Film,

100pF,

K,

125V

Q802

Transistor,

2SA970-GR

C619,

620

22388101

|

Polystyrene

Film,

100pF,

K,

125V

Q803,

804

Transistor,

25C2088-V

C801

|

22445220

|

Electrolytic,

22mfd,

16V

Q901

Transistor,

25C1669-0-0/Y

C802

22448478

|

Electrolytic,

0.47mfd,

50V

Q902

Transistor,

2SA839-0-0/Y

C803

22440154

|

Electrolytic,

100mfd,

6.3V

D601,

602

Diode,

O2Z24A

C804

22372224

|

Mylar,

0.22mfd,

K,

50V

D603,

604

Diode,

1$1555V

C805

22372103

|

Mylar,

0.01mfd,

K,

50V

D605,

606

|

Diode,

181555V

C806

(22372103

|

Mylar,

0.01mfd,

K,

50V

D607,

608

22115424

|

Diode,

STV-4H

C901,

917

22340090

|

Ceramic,

4700pF,

Z,

250V

|

D801,

802

Diode,

181942

C902,

903

22340032

|

Ceramic,

0.02mfd,

Z,

500V

|

D803,

804

Diode,

1$1553V

C904,

905

22440228

|

Electrolytic,

1000mfd,

63V

D805,

806

.

Diode,

1$1553V

C906,

907

22449221

|

Electrolytic,

220mfd,

63V

D901

Diode,

1G2Z1

C908,

909

22440036

|

Electrolytic,

47mfd,

100V

D902

Diode,

1G2C1

C910,

911

22340032

|

Ceramic,

0.02mfd,

Z,

500V

D903

22115460

|

Diode,

M4C-41

C912,

913

22440229

|

Electrolytic,

10000mfd,

50V

D904,

907

Diode,

02Z18A

C914

22448470

|

Electrolytic,

47mfd,

50V

D905,

906

22115347

|

Diode,

RD33E

C916

22448330

|

Electrolytic,

33mfd,

50V

D908

|

Diode,

181942

D910,911,

|

22115473

|

Diode,

SEL301E

SC—M15

|

R813

22555333

|33K

ohm

a

RESISTORS

.

R814,816

|

22555182

|1.8K

ohm

All

resistors

are

“4W,

+5‘

carbon

fiim

unless

otherwise

noted.

R815,

817

92555122

|1.2K

ohm

piled

itn

R818,

820

|

22555223

|22K

ohm

R502

99555393

|

39K

ohm

R819

~

22555473

|47K

ohm

R503,

504

|

225551011100

ohm

R901,902

|

22555332

|3.3K

ohm

|

R505,

506

|

22555560

|56

ohm

R903,

904

|

22570322

|1.8K

ohm,

J,

Metal

Film,

2W

R507

09555563

|56K

ohm

R906

22545822

|8.2K

ohm

R508

99555393

139K

ohm

R907

22545182

|1.8K

ohm

R509

59555682

|

6.8K

ohm

R908,

909,

22570282

4.7K

ohm,

J,

Metal

Film,

1W

R510

22555683

|

68K

ohm

910

:

R603,

604

|

22555681

|

680

ohm

|

R605,

606

|

22555562

|

5.6K

ohm

22874047

|

Spacer,

Foot

R607,

608

|

22555562

|

5.6K

ohm

22902227

|

Owner's

Manual

R609,610

|

22555392

|

3.9K

ohm

R611,612

|

22555560

|

56

ohm

R613,

614

|

22555560

|

56

ohm

R615,616

|

22555680

|

68

ohm

R617,618

|

22555271

|

270

ohm

R619,

620

|

22555222

|

2.2K

ohm

R621,622

|

22555222/2.2K

ohm

R623,

624

|

22570269

|

390

ohm,

J,

Metal

Film,

1W

R625,626

|

22545153/15K

ohm

R627,

628

|

22555471

|

470

ohm

R629,630

|

22545473147K

ohm

|

R631,

632

|

22555121

|

120

ohm

R633,

634

|

225458221

8.2K

ohm

R635,

636

|

22545122]

1.2K

ohm

R637,

638

|

22570359

|

4.7

ohm,

J,

Metal

Film,

2W

R639,

640

|

22555101

|

100

ohm

|

R641,642

|

22570264!

120

ohm,

J,

Metal

Film,

1W

R643,

644

|

22545339

|

3.3

ohm

|

R645,

646

22500186

|

0.22

ohm,

K,

Wire-wound,

5W

R647,

648

22500186

|

0.22

ohm,

K,

Wire-wound,

5W

R649,

650

|

22545339/3.30hm

R651,

652

|

22658260

470

ohm,

Semi-fixed

R653,

654

|

22658292

|

100

ohm,

Semi-fixed

|

—-R655,-656

|

22555122/

1.2K

ohm

R657,

658

|

22570311

|

220

ohm,

J,

Metal

Film,

2W

R661,

662

|

22563101|

Solid,

100

ohm,

“W,

K

R663,

664

|

22563101

|

Solid,

100

ohm,

“W,

K

R801,802

|

22545563|56K

ohm

~

R803

225554731

47K

ohm

R804

22555183

|

18K

ohm

R805

22555224

|

220K

ohm

R806

22555183

|

18K

ohm

R807

22555333

|

33K

ohm

R808

.

22555563

|

56K

ohm

R809

22555563

|

56K

ohm

|

R810,811

|

22570270|

470

ohm,

J,

Metal

Film,

1W

R812

22555104

|

100K

ohm

|

we

ie

Toshiba SC-M15 User manual

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