Sanyo M7700L Manuel utilisateur

SERV.

8423

SERVICE

MANUAL

MINI

FM/MW/SW/LW

STEREO

RADIO

CASSETTE

RECORDER

M77OOLE

EUROPE

141

888

SPECIFICATIONS

Recording

System.

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

Bias

DIN

OUTPUT

202

ves

doe

etd

Dees

2.2k-ohm

Erasing

System.

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

Erasing

EXT.Speaker

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

3.2

—

Gohm

Tape

Speed

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

1-7/8ips

+3%

Headphone

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

8o0hm

Fast

ForwardTime.............

140sec.

(C-60

cassette)

Current

Consumption

(at

Min.

VR)

Rewind

Time...............0-.

‘140sec.

(C-60

cassette)

RECORD

mode

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

210mMA

Wow

Flutter...

..0.....000.0.

0.25%

RMS

PLAY

mode

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

160mA

Frequency

Response

F.FWD

mode

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

180mA

NORMAL

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

—

10,000Hz

REW

mode

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

180mA

Signal

Noise

Ratio

Output

Power

...........00...

2.0/chW

(maximum)

without

DOLBY

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

Better

than

48dB

Power

Source

Hum

Noise.......

Less

than

—55dBs

(Min.

Vol.

and

Tone)

eee

Bae

Adaptor

(120/240V

50/60Hz)

Crosstalk

Bo)

iteersrerreg

ete

7.5V

(UM-2,C

Cell,

11,R14,

Babyzellen

Track

Track...

2...

Better

than

50dB

Channel!

Separation.

.........

Better

than

50dB

Frequency

Range

Distortion

(3rd

harmonic)

LEW

vegetal,

erat

Loe

150

—

350kHz

NORMAL

ALS

ase

eden

fie

IAW

Sect

ence

525

—

1,605kHz

Terminal

Impedance

ena

Bowes

ett

5.8

—

18MHz

MEE

aint

one

3.3k-ohm

seve

Bunce

oehce

tease

koh

dao

87.5

—

108MHz

DIN

INPUT...

00.2

0000000..

3.3k-ohm

—Specifications

subject

change

without

notice.—

WM-4529.

DISASSEMBLY

INSTRUCTIONS

CABINET

BOTTOM

ASSEMBLY

REMOVAL

AMPLIFIER

P.C.BOARD

ASSEMBLY

REMOVAL

Take

out

the

cassette

tape

from

the

compartment

the

instructions

for

the

Cabinet

Bottom

Assembly

pressing

the

STOP/EJECT

button.

Removal.

Turn

over

the

unit

soft

surface

and

remove

the

battery

Unscrew

the

two

screws

fastening

the

P.C

Board.

compartment

lid.

Then,

take

out

the

five

batteries

from

the

unit.

Unscrew

the

five

screws

—5)

fastening

the

Cabinet

Bottom

and

lift

the

Cabinet

Bottom

illustrated.

Pull

out

the

connector

(CN1)

from

the

P.C.Board.

Carefully

remove

the

P.C.

Board

lifting

the

numerical

order

illustrated.

Cabinet

Bottom

Connector

(CN1)

Pull

out

the

two

connectors

the

dipole

antenna

from

the

Radio

Tuner

P.C.Board.

Then,

remove

the

Cabinet

Bottom.

Cabinet

Bottom

Reassembie

the

reverser

order.

RADIO

TUNER

P.C.BOARD

REMOVAL

the

instructions

for

the

Cabinet

Bottom

Assembly

Removal.

Turn

the

Tuning

Knob

fully

arbitrary

direction.

Reassemble

the

reverse

order.

DISASSEMBLY

Unscrew

screw

(8)

fastening

the

P.C.Board.

Remove

the

P.C.Board

lifting

the

tuning

knob

side

it.

NOTE:

not

turn

the

Tuning

Knob

before

the

Tuner

P.C.Board

re-mounted

the

unit.

Reassembie

the

reverse

order.

RADIO

CHASSIS

ASSEMBLY

REMOVAL

Remove

the

Cabinet

Bottom

Assembly,

Amplifier

P.C.Board

Assembly,

and

Tuner

P.C.Board

Assembly

following

the

instructions

for

them.

Pull

out

the

Volume

Control

Knob,

Tone

Control!

Knob,

Balance

Control

Knob,

Mixing

Control

Knob,

and

Tuning

Knob

from

the

unit

illustrated.

Volume

Control

Knob

TanaContrerKnes

Mixing

Control!

Knob

Balance

Control

Knob

cca@)

Connector

(CN

Radio

Chassis

Tuning

Knob

Unsolder

the

three

leads

from

the

Radio

Tuner

P.C.Board

and

remove

the

connector

(CN1)

from

the

Amplifier

P.C.Board

illustrated.

INSTRUCTIONS

(Continued)

Unscrew

the

two

screws

&10}

fastening

the

Radio

Chassis

and

remove

the

Radio

Chassis

tilting

illustrated.

NOTE:

The

Radio

Chassis

may

removed

without

unsoldering

the

leads.

Remove

the

Radio

Chassis

noting

the

leads.

the

Radio

Chassis

from

the

Cabinet

Top

completely

removed,

unsolder

the

lead

wires

the

Sound

Level

L.E.D.

and

Built-in

Microphone

from

the

Amplifier

P.C.Board.

Reassemble

the

reverse

order.

CHASSIS

ASSEMBLY

REMOVAL

After

removing

the

Cabinet

Bottom

and

Radio

Chassis,

unscrew

the

screw

(6)

fastening

the

Amplifier

P.C.Board.

Then,

turn

over

the

Radio

Chassis.

See

the

illustration

below.

Unscrew

the

screw

(11)

fastening

the

Jack

Bracket,

the

screw

(12)

fastening

the

Governor

Circuit

P.C.Board,

and

the

screws

(13

—

16)

fastening

the

Chassis

illustrated.

DISASSEMBLY

INSTRUCTIONS

(continuea)

After

removing

the

Jack

Bracket

and

the

Governor

Circuit

CASSETTE

COMPARTMENT

LID

REMOVAL

P.C.Board,

remove

the

Chassis

illustrated.

Open

the

cassette

compartment

lid

pressing

the

STOP/EJECT

button.

remove

the

cassette

compartment

lid,

unlock

the

click

the

cassette

compartment

lid

from

the

Cabinet

Top

Chassis

pressing

the

counter

side

the

lid

illustrated.

Cassette

Compartment

Lid

Radio

Chassis

Reassemblie

the

reverse

order.

NOTICE

REASSEMBLY

When

the

unit

re-assembled,

check

see

that

the

lead

wires

not

touch

the

driving

mechanism

(Example:

Flywheel,

Pulley,

and

Belts

etc.,).

When

you

solder

the

removed

lead

wires,

please

refer

the

Wiring

Diagram.

MECHANICAL

ADJUSTMENTS

GENERAL

REMARK

Before

adjusting

the

mechanism

this

unit,

wipe

the

tape

contacting

surfaces

clean

well

the

contact

surfaces

the

driving

parts

with

soft

cloth

soaked

alcohol.

Trouble

may

occur

because

oil

and

grease

stains.

Carefully

handle

the

belt

because

grease

easily

attaches

it.

FLYWHEEL

THRUST

ADJUSTMENT

The

clearance

between

the

Flywheel

Thrust

and

the

Flywheel

should

0.03

—

0.35mm

with

the

Chassis

turned

over.

necessary

adjust

the

clearance

the

following

procedure.

While

moving

the

Capstan

and

down,

slowly

turn

the

Flywheel

Thrust

clockwise

obtain

the

clearance

between

the

Thrust

and

Flywheel.

NOTE:

not

turn

the

Flywheel

Thrust

forcibly.

Adjustment

Flywheel

Support

Flywheel

Thrust

0.03

—

0.35

Flywheel

Capstan

_—

Turn

the

Thrust

counter-clockwise

45°

from

the

position.

After

the

adjustment,

secure

the

Thrust

with

paint

glue.

POWER

SWITCH

POSITION

ADJUSTMENT

Check

see

that

the

Power

Switch

positioned

over

the

center

the

chassis

adjusting

hole

illustrated.

Mounting

Screw

Power

Switch

Position

the

leaf

over

the

center

the

hole.

Take-up

Gear

necessary,

loosen

the

screw

fastening

the

Switch

and

adjust

the

switch

position

moving

the

Switch.

After

tightening

the

screw,

check

the

switch

movement

follows:

Set the

unit

the

playback

mode

and

slowly

push

the

F.FWD

button.

Then,

check

that

the

Power

Switch

changed

over

from

‘'Close’’

"Open",

and

that

changed

‘’Close’’

again

after

the

Take-up

Gear

meshes

with

the

Gear.

Check

that

the

Power

Switch

functions

properly.

Then,

secure

the

screw

with

paint

glue.

ELECTRICAL

ADJUSTMENTS

REQUIRED

EQUIPMENTS

VTVM

(two

sets)

Frequency

Counter

Dummy

Load

(470

k-ohm)

Dualtrace

Synchroscope

Test

Tapes

3kHz

test

Tape

(TEAC

MTT-111)

for

Tape

Speed

Adjustment

8kHz

Test

Tape

(TEAC

MTT113C)

for

Head

Azimuth

Adjustment

1kHz

Test

Tape

(TEAC

MTT-112B)

for

Playback

Gain

Adjustment

Constant-Voltage

Regulator

Alignment

Tool

Prior

the

Electrical

Adjustments,

set

the

unit

and

the

measuring

instruments

follows:

Function

Switch

2.2...

0.0...

ees

TAPE

Mode

Switch.............

0000s

STEREO

Input

Select

Switch

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

REC/PB

terminal

Beat

Cancel

Switch

..........

0.0000

eee

Constant-Voltage

Regulator

Output

.......

7.5V

NOTE:

Perform

each

adjustment

the

described

order.

Obtain

the

output

from

the

R/P

DIN

socket.

Supply

7.5

from

the

constant-voltage

regulator

the

unit.

When

obtaining

the

output

from

the

R/P

DIN

socket,

connect

the

leads

noting

the

terminal

numbers

illustrated.

Ground

Right

Channel

Output

Right

Channel

Input

Left

Channel

Input

Left

Channel

Output

TAPE

SPEED

ADJUSTMENT

Remove

the

battery

compartment

lid

and

connect

the

frequency

counter

the

left

right

channel

output

terminals

the

R/P

DIN

socket

illustrated.

Frequency

Counter

3,000Hz

(+3%)

Dummy

Load

470

k-ohm

Insert

the

kHz

test

tape

(Example:

TEAC

MTT-111)

into

the

compartment

and

play

back.

Adjust

the

tape

speed

turning

the

potentiometer

(P801)

the

Governor

Circuit

P.C.Board

with

alignment

tool

obtain

3,000

(43%)

the

frequency

counter.

See

the

illustration

below.

Tape

Speed

Adjusting

Hole

HEAD

AZIMUTH

ADJUSTMENT

ile

Remove

the

cassette

compartment

lid.

Connect

VTVM

and

{

dualtrace

synchroscope

the

R/P

DIN

socket

illustrated.

Synchroscope

x.)

dc)

Dummy

Load

470

k-ohm

Dummy

Load

470

k-ohm

Set

the

synchroscope

follows:

MODE.

fang

Dust

tat

dat

CHOP

SOURCE

chsh

Setok

ines

setlist

INT

(CH1

CH2}

*™“SWEEPIMODES

os.

oct

oat

See

Nera

Bee

AUTO

Insert

the

kHz

test

tape

(Example:

TEAC

MTT-113)

into

the

compartment

and

play

back.

Slowly

turn

the

azimuth

adjusting

screw

until

the

amplitudes

both

channel

output

wave

forms

become

maximum

and

the

wave

forms

overlap

well

possible

the

maximum

condition

the

illustrated.

R/P

Head

ELECTRICAL

ADJUSTMENTS

(continua)

Adjustment

After

the

adjustment,

secure

the

screw

with

paint

glue.

PLAYBACK

GAIN

ADJUSTMENT

Connect

the

two

sets

VTVM

the

R/P

DIN

socket

illustrated

and

insert

the

kHz

test

tape

(Example:

TEAC

MTT-112B)

into

the

compartment.

REC

VTVM

Dummy

Load

470

k-ohm

470

k-ohm

RIGHT

CHANNEL

Check

see

that

the

output

the

right

channel

0.65

(£0.1

with

the

unit

the

playback

mode.

necessary,

ground

the

resistor

R108

and/or

R109

soldering

the

pattern

obtain

the

specified

output

illustrated.

Q303

LEFT

CHANNEL

Adjust

the

output

grounding

separating

the

resistor

R208

and/or

R209

with

the

same

method

RIGHT

CHANNEL.

After

the

adjustment,

check

that

the

output

difference

between

the

right

channel

and

the

left

channel

within

dB.

c205

R205

ote

aed

owe

“Se

]

C206

e4}+-6C207

Die

eite

pec

eae

R207

fee

oes

oc:

Gee

‘emia

C2108

tc2

zeit

c2097*"

c20stia709

owe

R202

dus

R210

oft

R208

rset

oO.

Teed

R203

OSCILLATOR

FREQUENCY

AND

RECORDING

BIAS

ADJUSTMENT

RIGHT

CHANNEL

Connect

the

VTVM

across

R103,

and

the

frequency

counter

the

output

terminal

the

VTVM

illustrated.

VTVM

3.8mV

—

4.3mV

Frequency

Counter

48.85kHz

—

48.95kHz

ote

TS)

dae

Q303

Set

the

unit

the

recording

mode.

Then,

adjust

the

frequency

turning

the

core

the

oscillator

transformer

(T301)

with

alignment

tool

until

the

frequency

counter

reads

48.85

kHz

—

48.95

kHz.

Adjust

the

potentiometer

(P101)

with

the

unit

the

recording

mode

until

the

VTVM

reads

3.8mMV

—43

(380

—

430

pA).

LEFT

CHANNEL

Connect

the

VTVM_~

across

R203.

Then,

adjust

the

potentiometer

(P201)

until

the

VTVM

reads

3.8

—

(380

~—

430

pA).

VTVM

3.8mV

—

4.3mV

TUNER

ADJUSTMENT

Measuring

Instruments

Required

FM/SW

alignment

(Tuning

Range

and

Tracking)

Standard-signal

Generator

Standard-signal

Generator

®@

Generator

Scope

Stereo

Signal

Generator

Scope

atte

Loop

Antenna

‘3

ped

Dummy

Antenna

(300

ohm,

balanced

type)

Eid

ie!

VTVM

nie

Frequency

Counter

Orerg@rre

aig

Distortion

Meter

GTP

Oscilloscope

Dummy

Load

(3.2

ohm)

osz-5

Alignment

Tool

fod

rzsiew

rag

pot

°C

TQ,

0ed

NOTE:

opie

F009}

gsre_°

87%8

Set

the

Function

Switch

RADIO

(ON).

Then,

perform

each

alignment

following

the

chart

below.

(Input

Side)

(Output

Side)

Measuring

Instrument

Connections

MW/LW

alignment

;

Signal

Generator

Loop

Antenna

Standard

Signal

Generator

Dummy

Antenna

VTVM

Oscilloscope

[

;

Bama

Load

Dummy

Load

EXT.

32-60

3.2

ohm

fee

3.2

ohm

iO}

ALIGNMENT

Standard

test

frequency

400

kHz

and

modulation

30%

Connections

Frequency

Alignment

Signal

OUTPUT

Generator

Tuning

Dial

Setting

Adjustment

Remarks

Calibration

Connect

standard

Obtain

symmetrical

curve

for

loop

antenna

Connect

input

and

maximum

amplitude,

T5,76

and

output

terminal

gene-scope.

gene-scope

460

kHz

T5,T6

and

Adjustment

Place

bar

antenna

detector

output.

away

from

Gain

loop

antenna.

Calibration

Connect

standard

505

kHz

T10

Obtain

sine

wave

400

loop

antenna

Connect

VTVM

with

and

maximum

amplitude.

Tuning

Range

output

signal

3.2

ohm

dummy

load;

1670

kHz

High

End

TC3

generator.

and

oscilloscope

Adjustment

Place

bar

antenna

Ext.

speaker

terminal.|

600

kHz

600

kHz

L5-1

(bar

ant.

coil)

away

from

Tracking

loop

antenna.

1400

kHz

1400

kHz

TC4

Repeat

the

above

adjustments.

Use

screwdriver

with

plastic

grip

for

all

adjustments.

ALIGNMENT

Connections

TUNER

ADJUSTMENT

(continue)

Standard

test

frequency

400

and

deviation

22.5

kHz

Frequency

Alignment

Calibration

Place

output

gene-scope

Trap

Coil

(L2).

Signal

OUTPUT

Generator

Connect

input

terminal

gene-

scope

detector

output.

Calibration

Tuning

Range

Adjustment

Tracking

Connect

signal

generator

antenna

terminal

through

dummy

antenna.

Tuning

Dial

Setting

Low

End

Adjustments

Turn

(blue

core}

fully

counter-

clockwise.

and

Obtain

symmetrical

curve

and

maximum

amplitude.

(blue

core)

Obtain

curve

and

maximum

amplitude.

Connect

VTVM

with

3.2

ohm

dummy

load

and

oscilloscope

High

End

Ext.

speaker

terminal.

MHz

106

MHz

106

MHz

Obtain

sine-curve

and

maximum

amplitude.

Repeat

the

above

adjustments.

’

Use

screwdriver

with

plastic

grip

for

all

adjustments.

ALIGNMENT

Alignment

Calibration

Tuning

Range

Adjustment

Tracking

Connections

Frequency

Connect

signal

generator

antenna

terminal

through

dummy

antenna.

Signal

OUTPUT

Generator

5.7

MHz

Connect

VTVM

with

Tuning

Dial

Setting

Low

End

Adjustment

3.2

ohm

dummy

load;

18.7

MHz

High

End

and

oscilloscope

Ext.

speaker

terminal.

6.5

MHz

6.5

MHz

Remarks

Obtain

sine-wave

400

and

maximum

amplitude.

Repeat

the

above

adjustments.

Use

screwdriver

with

plastic

grip

for

all

adjustments.

ALIGNMENT

Alignment

Calibration

Tuning

Range

Adjustment

Connections

Frequency

Tracking

Connect

standard

loop

antenna

output

signal

generator.

Place

bar

antenna

away

from

loop

antenna.

Signal

OUTPUT

Generator

147

kHz

Tuning

Dial

Setting

Low

End

Adjustment

T11

Connect

VTVM

with

3.2

ohm

dummy

load

365

High

End

TC8

and

oscilloscope

Ext.

speaker

terminal.

170

L5-2

(bar

ant.

coil)

310

TCS

Remarks

Obtain

sine-wave

400

and

maximum

amplitude,

Repeat

the

above

adjustments.

TUNER

ADJUSTMENT

(continued)

MULTIPLEX

ADJUSTMENT

Prior

the

adjustment,

set

the

unit

follows:

Connect

the

VTVM

with

3.2

ohm

dummy

load,

distortion

@®

FunctionSwitch

..........00ce0e

RADIO

(ON)

meter,

and

oscilloscope

the

external

speaker

jack

the

Band

Select

Switch

........

00000

cee

eee

left

channel

illustrated.

Mode

Switch.......

2.20.00.

STEREO

ToneControl

2.0.0...

eee

MAXIMUM

VTVM

VolumeControl

.......

2.2...

200

eee

Center

EXT.

3.2

©:

Oscilloscope

kHz

(V.C.0.)

ADJUSTMENT

Connect

the

frequency

counter

the

twelfth

IC2

illustrated.

Dummy

Load

3.2

ohm

Frequency

Counter

Distortion

Meter

Adjust

the

input

measuring

instruments

follows:

Stereo

Signal

Generator

Adjust

the

potentiometer

(P1)

until

the

oscillation

Pilot

Signal...

....

7.5

kHz

dev.

{modulation

10%)

frequency

IC2

becomes

kHz

(£20

Hz).

Stereo

Signal........

67.5

kHz

dev.

for

main

signal

(modulation

90%)

Modulation

Frequency

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

400

Standard-signal

Generator

CHANNEL

SEPARATION

ADJUSTMENT

Signal

Generator

Frequency

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

MHz

Insert

the

3000hm

dummy

antenna

(balanced

type)

Signal

Generator

Output

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

through

the

antenna

terminals

(TP1

and

TP2)

the

Radio

Tuner

P.C.Board

illustrated.

Perform

the

alignment

following

the

chart

the

page.

Stereo

Signal

Generator

Dummy

Antenna

300

—~10—

Table des matières

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