Sanyo M-G12 User manual

Table of contents

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SERVICE

MANUAL

STEREO

CASSETTE

RECORDER

Power

Source

DOS

Det

het

hepsi

eethate

dye

Anakaaciave

6V

(UM-3,

HP

7,

AA

Cell,

Mignonzelle,

R

6)

x

4

Output

Power

.......0.0000.c

ccc

cece

e

ee

30mW

x

2

(Max.)

Current

Consumption

(at

Vol.

Min.)

Playback

mode

...................0.0005.

140mA

Fast

Forward/Rewind

mode............

170mA

Tape

Speed

2.0.0.0...

cece

cece

ees

1-7/8ips.+

3%

Fast

Forward/Rewind

Time

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

160sec.

(with

C-60)

Torque

PIAVDACK

si.00seieateds

cool

een

occu

te

32

~

60g-cm

Fast

Forward/Rewind

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

more

than

50g-cm

—Specifications

subject

to

change

without

notice.—

142

385

07

Wow

&

Flutter

......0....

0...

e

cece

eee

0.55%,

RMS

Frequency

Response

(Playback)

POQOS

cen

Gucevin

See

eantascdiaeteasonia

ns

63Hz

~

8,000Hz

MGs

ies

ues

aalonas

ad

bandana

aus

ee

63Hz

~

10,000Hz

Signal

to

Noise

Ratio

(with

Fe2Os)

......

more

than

40dB

Crosstalk

(with

Fe203)

Tack40

Track.

scjccssesizicssiveme

ass:

more

than

53dB

Channel

Separation

(with

Fe2O3)

.......

more

than

30dB

Hum

&

Noise

(at

Vol.

Min.)

..........0.....

—38dBs

Terminal

Impedance

FICAGDNONG

bcdc

ical

cidedeacaseaendcouseres

320,

WM-9390

DISASSEMBLY

INSTRUCTIONS

GENERAL

REMARKS

e

Before

disassembling

the

unit,

spread

a

soft

rubber

mat

or

a

cloth

on

the

workbench

to

avoid

scratches

and

grease

stains.

LED

e

Donotusea

material

which

is

likely

to

cause

static

electricity

because

transistors

and

ICs

may

be

easily

damaged

by

it.

e

Reassemble

the

unit,

noting

the

kinds

of

screws,

the

solder-

ing

and

arrangement

of

the

leads.

Refer

to

“Circuit

Diagram

and

Exploded

Views”

for

correct

assembly.

Orange

e

Before

disassembling

the

unit,

take

out

the

cassette

tape

rH

and

the

batteries.

White

CABINET

BOTTOM

REMOVAL

1.

Open

the

Cassette

Compartment

Lid

by

pressing

the

Stop

Button

and

take

out

the

cassette

tape

from

the

Compartment.

2.

Turn

over

the

unit

with

front

side

down

on

a

soft

surface

and

remove

the

Battery

Compartment

Lid.

Then,

remove

the

(6)

batteries.

®

3.

Remove

the

five

screws

(1

~

5)

fastening

the

Cabinet

b

Amplifier

P.C.Board

Bottom

and

lift

the

Cabinet

Bottom

away

from

the

unit.

Cabinet

Bottom

4

3.

Turn

over

the

P.C.Board

toward

the

front

of

the

unit

with

cau-

tion

not

to

damage

the

Playback

Head,

Motor

and

Battery

Terminal

leads.

4.

Reassembie

in

reverse

order.

NOTE:

When

unsoldering

the

removed

lead

wires,

refer

to

the

wiring

4.

Reassemble

in

reverse

order.

diagram

to

avoid

miswiring.

AMPLIFIER

P.C.BOARD

REMOVAL

MECHANISM

CHASSIS

REMOVAL

1

Follow

the

instructions

for

the

“Cabinet

Bottom

Removal”.

1.

Follow

the

instructions

for

“Cabinet

Bottom

Removal”

and

“Amplifier

P.C.Board

Removal”.

2.

Remove

the

screw

(6)

fastening

the

P.C.Board

and

unsolder

the

LED

leads

(White

and

Orange)

from

the

P.C.Board

to

pro-

2.

Remove

the

two

posts

(7

and

8)

and

the

screw

(9)

holding

tect

the

LED

indicator.

the

Mechanism

Chassis.

Cabinet

Top

DISASSEMBLY

INSTRUCTIONS

(continued)

Mechanism

Chassis

.

After

the

Cassette

Compartment

Lid

is

opened,

set

the

mechanism

in

the

playback

mode

by

pressing

the

Play

Button.

.

To

detach

the

Mechanism

Chassis,

lift

the

Mechanism

Chas-

sis

in

the

direction

of

the

arrow

until

the

Play

Button

is

re-

moved

from

the

button

hole

of

the

Cabinet

Top.

Then,

left

the

motor

side

of

the

Mechanism

Chassis

away

from

the

Cabinet

Top.

Reassemble

in

reverse

order.

ADJUSTMENTS

GENERAL

REMARKS

Before

adjusting

the

mechanism

of

this

unit,

wipe

the

tape

contacting

surfaces

of

the

Head,

Pinch

Roller

and

Capstan,

and

the

surfaces

of

the

driving

parts

such

as

the

Drive

Belt,

Take-up

Belt,

Flywheel

and

Pulley

with

a

soft

cloth

soaked

in

alcohol.

Trouble

may

occur

because

of

oil

and

grease

stains.

Carefully

handle

the

belt

because

grease

easily

attaches

to

it.

Then,

check

the

used

rubber

parts.

If

the

rubber

has

dete-

riorated

or

is

scratched,

replace

the

parts

with

new

ones.

NOTES

ON

HANDLING

THE

CHIP

ELEMENT

Pay

due

caution

to

the

following

items:

1.

Chip

Element

Solder

2.

Do

not

use

the

removed

chip

element

again.

Chip

Element

Solder

YU)

x

O

(Incorrect)

(Correct)

P.C.Board

Use

a

soldering

iron

of

less

than

30W.

*

The

soldering

iron

should

not

touch

the

body

of

the

chip

element.

Complete

soldering

in

a

short

time.

Apply

solder

to

the

chip

element

as

illustrated

below.

EQUIPMENT

REQUIRED

VTVM

Frequency

Counter

Dummy

Load

(330

)

Test

Tapes

*

3kHz

test

tape

(Example:

TEAC

MTT-111)

for

the

Tape

Speed

Adjustment

*

10kHz

test

tape

(Example:

TEAC

MTT-114)

for

the

Head

Azimuth

Adjustment

Alignment

Tool

NOTE:

Before

the

Electrical

Adjustments,

set

the

unit

as

follows:

<i

TORE

SWICD):

tc2

avd

Radeakntn

escllcarenuddets

ouiece

bout

ves

HIGH

*

Mute

Switch

...........

ccc

cece

cece

ec

eeccneceueeeuceuavens

OFF

*

Balance

Control

................0ceceeeee

O

(Center

Position)

*

Supply

a

regulated

DC

6V

power

to

the

Ext.

Power

Jack.

TAPE

SPEED

ADJUSTMENT

1.

Remove

the

Battery

Compartment

Lid

and

take

out

the

bat-

teries

from

the

compartment,

and

connect

the

regulated

DC

6V

power

supply

to

the

Ext.

Power

Jack.

Connect

a

frequency

counter

to

the

Headphones

Jack

as

il-

lustrated

and

insert

a

3kHz

test

tape

(Example:

TEAC

MTT-111)

into

the

Cassette

Compartment.

Frequency

Counter

3kHz

PHONES

©

Dummy

Load

330

3.

While

playing

back

the

test

tape,

adjust

the

tape

speed

by

Potentiometer

for

Tape

Speed

Adjustment

turning

the

potentiometer

(P301)

on

the

P.C.Board

with

an

alignment

tool

until

the

frequency

counter

reads 3kHz.

ADJUSTMENTS

(continued)

HEAD

AZIMUTH

ADJUSTMENT

1.

Open

the

Cassette

Compartment

Lid

and

remove

the

Azi-

muth

Cover

from

the

Lid

by

pushing

it

with

a

tweezers

in

the

direction

of

the

arrow.

Cassette

Compartment

Lid

Azimuth

Cover

2.

Connect

two

VTVMs

and

a

synchroscope

to

the

Headphone

Jack

as

illustrated.

Set

the

synchroscope

as

follows:

Pi

MMOD

vc

crease

partner

tecerin

cnet

neato.

CHOP

(chopped)

*

“SOURCE

+8

acs

c

acess

INT

(internal),

CH1

or

CH2

*

AUTO

(automatic)

Dummy

Load

330,

qn)

Dummy

Load

330

anny

IM

jaa=

@

PHONES

3.

Insert

a

10kHz

test

tape

(Example:

TEAC

MTT-114)

into

the

Cassette

Compartmnt

and

play

it

back.

:

—5-—

Azimuth

Adjusting

Screw

4.

While

playing

back

the

test

tape,

slowly

turn

the

azimuth

ad-

justing

screw

until

the

amplitudes

of

both

channel

output

wave

forms

become

maximum

and

the

wave

forms

overlap

as

well

as

possible

in

the

maximum

condition

of

the

VTVM

as

iilustrated.

Adjustment

Adjustment

S

ry”)

Playback

Head

5.

After

the

adjustment,

secure

the

adjusting

screw

with

paint

or

glue.

PARTS

LIST

ner

Part

No.

Description

Q’ty

PACKAGE

141

6

1419

65300

—_

individual

Carton

|

141

6

1449

82600

Styrofoam

Case

|

141

6

2519

08015

Poly

Cover

80

x

150

1

141

6

3919

42000

Plain

Pad

|

141

6

2519

12090

Poly

Cover

2

141

6

4559

00100

Serial

No.

Sheet

3

141

6

4729

37300

Red

Label

(Red)

3

ACCESSORIES

4

1529

70240

Headphones

1

141

0

1259

02700

_

Belt

Clip

Assy

1

141

2

1769

05100

Shoulder

Strap

1

141

2

1819

13900

Carrying

Case

1

141

6

4519

07700

Warranty

Card

1

141

6

4729

37321

POP

Label

1

141

6

4119

31586

Instruction

Manual

1

HEADPHONES

ss

4

1529

70240

Headphones

1

1

141

2

1769

06800

‘Slider

1

2

141

2

8219

32600

Stopper

2

3

141

2

1769

06700

Hanger,

Left

1

4

141

2

1769

06701

Hanger,

Right

1

5

141

2

1259

04900

Housing

2

6

4

1529

70280

Ear

Speaker

2

7

141

2

2449

44200

Baffle

2

8

141

2

4469

41900

Ear

Pad

2

9 4

2369

73640

Plug

Cord

1

10

141

2

3529

38200

Slide

Adjustor

2

CABINET

141

2

2449

45800

Sheet

1

141

2

2899

14000

Adhesive

Sheet

1

CAI

141

0

1119

88106

Completed

Cabinet

Top

(Silver)

1

CAI

141

0

1119

88105

Completed

Cabinet

Top

(Red)

|

CA2

141

2

4219

10602 Screw

(Silver)

+M1,7x4.0

1

CA2

141

2

4219

10601

Screw

(Red)

+M1.7x4.0

1

CA3

4

2029

71160

LED,

SLP-151B

(Battery)

(D1]

1

CA4

141

2

2419

27400

Azimuth

Cover

(Silver)

1

CA4

141

2

2419

27402

Azimuth

Cover

(Red)

1

CA5

141

2

7539

24300

Post

2

CA6

4

1329

78100

Amplifier

P.C.B.

Assy

[See

PCB1]

(Silver)

1

CA6

4

1329

78105

Amplifier

P.C.B.

Assy

[See

PCB1]

(Red)

1

CA7

141

2

4419

14901

Sheet

4

CA8

141

2

4219

08900

Screw

1

CA9

141

2

1639

50500

Volume

Knob

(Silver)

|

CAS

141

2

1639

50501

Volume

Knob

(Red)

1

CA10

141

2

4469

39000

Cushion

1

CA11

+141

2

1659

08900

Mute

Button

1

CA12

141

2

1649

19800

Tone

Knob

(Silver)

1

CA12

141

2

1649

19801

Tone

Knob

(Red)

1

CA13

141

0

1119

88200

Cabinet

Bottom

Assy

(Silver)

1

CA13.

141

0

1119

88202

Cabinet

Bottom

Assy

(Red)

1

CA14

=

141

2

2149

18300

Cabinet

Bracket

1

CA15

141

2

4219

27200

Screw

+M1.7x5.0

1

CA16

§=141

2

1339

28600

_

Battery

Lid

(Silver)

1

CA16

141

2

1339

28602

Battery

Lid

(Red)

1

CA17

141

2

4469

43200

Cushion

1

CA18

141

2

4219

30000

Screw

(Silver)

+M2.0x10

2

CAi8

141

2

4219

30001

Screw

(Red)

+M2.0x10

2

|

oO)

|

Ref.

No.

Part

No.

Description

Q’ty

CX1

101

3

1302

00711

Screw,

Pan

Hd.

+M2.0x7

1

CX2

101

3

1702

00614

Screw,

Bind

Hd.

(Silver)

+M2.0x6

2

CX2

101

3

1702

00618

Screw,

Bind

Hd.

(Red)

+M2.0x6

2

CX3

110

3

2101

70013

Spring

Washer-2

M1.7

1

CX4

127

3

1317

04014

PI

Screw-1,

Pan

Hd.

+M1.7x4.0

1

NOTES:

1.

Parts

order

must

contain

Model

Number,

Part

Number

and

Description.

2.

Ordering

quantity

of

screws

and

resistors

must

be

multiple

c

10

pcs.

CABINET

EXPLODED

VIEW

HEADPHONE

EXPLODED

VIEW

Ref.

No.

MC1

MC2

MC3

Mc4

MC5

MC6

MC7

MC8

MC9

MC10

MC11

MC12

MC13

MC14

MC15

MC16

MC17

MC18

MC19

MC20

MC21

MC22

MC23

MC24

MC25

MC26

MC27

MC28

MC29

MC30

MC31

MC32

MC33

MC34

MC35

MC36

MC37

MC38

MC39

MC40

MC41

MC42

MC43

MC44

MC45

MC46

MZ1

MZ2

MZ3

Part

No.

MECHANISM

141

0

3119

21600

141

2

4459

26800

141

2

4219

23300

4

5279

71240

141

2

4539

27601

141

0

7419

36700

141

2

8519

07500

141

2

3529

36500

141

2

8519

47400

4

2429

72250

141

2

4219

24500

141

2

8559

02500

141

0

5369

01900

141

2

4839

17500

141

2

4539

30600

141

2

5519

47200

141

0

5459

02000

141

2

8529

11600

141

2

4539

19800

141

0

5219

09400

141

2

5649

20600

141

0

5219

03701

141

2

7319

54700

141

0

7419

36600

141

0

7419

36500

141

2

7439

31000

141

2

3519

60800

141

2

8549

06800

141

2

8519

71200

141

2

8549

18200

141

2

4219

29900

141

2

7439

31100

141

0

3519

21500

141

2

3229

40300

141

2

4579

01400

141

2

4539

13000

141

2

5519

47000

141

2

5649

09900

141

0

5319

07300

141

2

8529

11700

141

2

7439

30700

141

2

5519

47500

141

2

4539

15700

141

0

7419

36400

141

2

5519

47100

141

2

4539

31500

101

3

1802

00311

101

3

2502

00611

112

3

1301

50082

MECHANISM

PARTS

LIST

Description

Chassis

Assy

Cushion,

Motor

Screw

Motor

[M1]

Washer

Play

Lever

Assy

Spring,

Stop

Lever

Base

Head

Spring,

Head

Play

Back

Head

[HD1]

Screw

Spring,

Supply

Supply

Reel

Assy

Washer

Washer

F.FWD

Gear

Pinch

Roller

Assy

Spring,

Pinch

Roller

Washer

Flywheel

Assy

Drive

Beit

Sub

Flywheel

Assy

Lock

Plate

Stop

Lever

Assy

Rewind

Lever

Assy

Review

Arm

Plate

Spring,

Lock

Plate

Spring

Spring

Screw

Power

Arm

Reel

Plate

Assy

Shield

Plate

Washer,

Take-up

Pulley

Washer

Take-up

Pulley

Take-up

Belt

Take-up

Reel

Assy

Spring,

ASO

Cancel

Take-up

Arm

Take-up

Gear

Washer

Fast

Lever

Assy

Fast

Gear

Washer

Screw,

Truss

Hd.

Screw,

Cylinder

Hd.

E

Ring

M6.0x10x0.25

+M2.0x3

-M2.0x6

M1.5

Q’ty

en

ee

ee

ee

ee

ne

ee

ee

en

ee ee

ee

ee

a

ee

OO

Ok

Ce

a

a

a

a a

an

a

a.

a

mrs

NOTES:

1.

Parts

order

must

contain

Model

Number,

Part

Number

and

Description.

2.

Ordering

quantity

of

screws

and

resistors

must

be

multiple

of

10

pcs.

MECHANISM

EXPLODED

VIEW

(Chassis

Top)

&——me14

MC13

——

M12

——-G

MC21

MC20