Sony Walkman wm-702 User manual

MICROFILM

SERVICE

MANUAL

Dolby

noise

reduction

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

“DOLBY”

and

the

double-D

symbol

DQ

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

SPECIFICATION

Radio

section

(WM-F702)

Frequency

range

US

model:

FM:

87.9-107.9

MHz

AM:

530-1,670

kHz

AEP,

UK

model:

FM:

87.5-108

MHz

AM:

531~1,602

kHz

ET,

AUS

model:

TV:

1-12

CH

FM:

76.0-90,0MHz

AM:

531-1,629

kHz

Antenna

FM:

Headphone

cord

antenna

AM:

Built-in

ferrite

bar

antenna

Tape

player

section

and

genera!

Frequency

response

(DOLBY

NR

off)

15~—

18,000

Hz

Output

Headpnones

(PHONES

/REMOTE)

Jack

load

impedance

8-300

Q

Power

output

5mW+5mW

at

DC

operation.

162

Power

requirements

1.5

VDC

Rechargeabie

battery

One

R6

(size

AA)

battery

Battery

life

dio

R

i

ee

Rechargeable

NC-6WM

Abéhox:3

houre

seme

amie

fully

charged

Approx.

1.5

hours

Approx.

2.5

hours

Sony

AM3

(N)

Approx.

10

hours

Rechargeabie

NC-6WM

with

Sony

AM3

(N)

Approx.

10

hours

Approx.

12

hours

For

maximum

performance

we

recommend

the

use

of

aikaline

batteries.

Dimensions

WM-702

:

Approx,

104.8X72.2X19.1mm

(w/h/d)

WM-F702:

Approx.

104.8X72.2x23.3mm

(w/h/d)

excl.

projecting

parts

and

controls

WM-702

:

Approx.

106.4%

74.6

20.7mm

(w/h/d)

WM-F702:

Approx.

106.4x74.6x25.4mm

(w/h/d)

incl.

projecting

parts

and

controls

Weight

WM-702

:

Approx.

150g

WM-F

702:

Approx.

190g

incl.

rechargeable

battery,

excl,

other

accessories

Accessories

supplied

Battery

case

(1)

Battery

charger

(1)

Rechargeable

battery

(1)

Lithium

battery

(WM-F701

ONLY,

1)

Stereo

headphones

with

remote

controller

(open-air

type.

1)

Plug

adaptor

(1)

Carrying

case

(1)

US

Model

WM-F702

AEP

Model

UK

Model

E

Model

WM-702

WM-F702

Photo

:

WM-F702

Model

Name

Using

Similar

Mechanism

Tape

Transport

Mechanism

Type

|

MT-WM702-17

WM-701C

TABLE

OF

CONTENTS

Section

Title

Page

Specifications

--+--

saceccaseerssscenoeees

seeses

see

eeteeerneseens

teeeeecesseevesees

1

SERVICING

NOTE:

GENERAL

Location

and

Function

of

Controls

ccecsesrersesreceereeren

sevens

3

ADJUSTMENTS

3-1.

Mechanical

Adjustmentserrrtrrrrrereereres

Saliva

aicleisabibaiebaien's

4

3-2.

Electrical

Adjustments

:rrsrtsrersereres

cecssccccceseeesensesed

DIAGRAMS

4-1,

Semiconductor

Lead

Layouts

4-2,

Printed

Wiring

Boards

—Cassette

Section

str:

8

4-3.

Schematic

Diagram

~—Cassette

Section—srterrrr

11

4-4,

IC

Block

Diagrams

srrrterssssessseesseeeeteeeenes

istiogtece

414

4-5,

Printed

Wiring

Boards

—Radio

Section

srr

15

4-6,

Schematic

Diagram

—~Radio

Section—

srrrrressr

17

EXPLODED

VIEWS

ceccecesees

belssusesseeseatastsietes

sisnpedee

coed]

Q

ELECTRICAL

PARTS

LIST

-s:ssesccsseeees

Nerrres

satiecs

wees

23

wm-702:

CASSETTE

PLAYER

Design

and

specifications

subject

to

change

without

notice.

Note:

AUS:

Austrarian

model

WM-F702

i

A

10

ASSETTE

PLA

R

WM-702,/F702

|

SECTION

1

SERVICING

NOTE

This

set

detects

reel

rotation

by

PH701

(photo

sensor),

Reel

rotation

cannot

be

detected

when

the

system

control

board

is

removed,

because

PH701

is

mounted

on

the

system

control

board,

As

a

result,

the

auto-off

circuit

and

tape

end

detection

will

misoperate.

And,

up

and

down

of

head

and

power

supply

of

playback

circuit

cannot

operate

when

the

system

control

board

is

removed,

because

$703

(play

switch)

is

mounted

on

the

system

control

board,

(S703

is

linked

to

on

and

off

of

the

plunger

solenoid.)

Therefore,

operation

check

of

the

mechanism

deck

and

voltage

check

can

be

performed

by

the

method

shown

below.

—System

Control

Board

(side

B)

—

SWITCH

FLEXIBLE

BOARD

FF/REW

mode

1)

Apply

the

square

wave

signal

to

the

PH701.

2)

Press

the

»

or

€

key.

PLAY

mode

1)

Apply

the

square

wave

signal

to

the

PH701,

2)

Press

the

»

key.

3)

Turn

on

S703

a

few

seconds

later,

—System

Control

Board

(side

A)

—

ciliaris

eet

{SYSTEM

CONTROL

BOARD]

pi

Aa

a:

Seam

gl

cl

ooo

)

a

Sp

SQUARE

WAVE

20Hz

0dB

(1V)

+

WM-702,/F702

:

"

i

About

the

headphones

with

remote

controller

WARNING

1

:

*

The

supplied

headphones

with

remote

controller

is

to

be

: : :

ADVARSEL!

used

only

with

this

unit.

—

;

.

¢

This

unit

cannot

be

operated

with

headphones

supplied

Lithiumbatteri—

Eksplosionsfare

h

Geis

theuen

ech

h

,

h

Udskiftning

ma

kun

foretages

to

other

models

‘

ough

t

ey

ae

the

same

plug

as

the

af

en

sagkyndig,

og

som

headphones

supplied

to

this

unit,

beskrevet

i

servicemanualen.

Also

other

models

cannot

be

operated

with

the

headphones

supplied

to

this

unit.

(But

sound

can

be

heard

in

either

case.)

Notes

on

chip

component

replacement

LITHIUM

BATTERY

SHOULD

ONLY

BE

CHANGED

BY

TECHNICAL

*

Never

reuse

a

disconnected

chip

component,

PERSONNEL.

THERE

IS

A

RISK

FOR

EXPLOSION

¢

Notice

that

the

minus

side

of

a

tantalum

capacitor

AT

A

WRONG

HANDLING.

may

be

damaged

by

heat,

:

rf

“Batteriet

ma

kun

udskiftes

med

et

batteri

af

samme

Flexible

Circuit

Board

Repairing

fabrikat

og

type”.

*

Keep

the

temperature

of

the

soldering

iron

around

270°

.

:

duri

ae

Because

of

the

risk

for

explosion

the

battery

must

ak

eee

be

replaced

with

the

same

type

and

manufacture

*

Do

not

touch

the

soldering

iron

on

the

same

conductor

P

7

of

the

circuit

board

(within

3

times),

*

Be

careful

not

to

apply

force

on

the

conductor

when

soldering

or

unsoldering,

PPPOE

LO

LODO

OO

OOOO

OO

OH

PP

LLL

LE

LLL

OPO

LH

POPE

PEPE

SEO

CO

HOC

OO

OHO

OOOH

PL

DL

DELL

OM

PM

POLE

OME

OA

OOOO

OO

SECTION

2

GENERAL

LOCATION

AND

FUNCTION

OF

CONTROLS

Unit

Ko,

ae

=

—

SS

&

18

|

>

:

ar

9]

!

init

of

Ue

Lt)

if.

Td:

Gir

mi

{13}

NOTE:

*

Illustration

:

WM-F702

--G)

[4]

[36]

$:

WM-F702

ONLY

[1]

™

STOP/RADIO

OFF

button

REVIFWD

BATT

(tape

transport

[19]

HOLD

switch

[24]

Battery

compartment

for

[2]

Cassette

holder

direction/battery)

indicator

Slide

the

HOLD

switch

in

the

direction

of

rechargeable

battery

[3]

Display

window

[11]

EX

DBB

(dynamic

bass

boost)

(MEGA

Ripe

paternal)

Pen

the

[25]

@

RADIO

ON/BAND

(radio

[4]

@

PRESET

TUNE

(preset

number

tpi

ire

EMOTE

(head

:

switch

is

slid

to

HOLD

on

the

unit,

you

can

on/band

select)

button

select)

button

[2]

PHONE

E

(headphones

with

operate

the

unit

with

the

remote

controller,

@

PRESET

TUNE

(preset

number

[=]

®

RADIO

ONWBAND

(radio

on

remote

controller)

jack

and

even

if

the

switch

is

slid

to

HOLD

on

select)

button

switch/band

select)

button

[13]

DOLBY

NR

(Dolby

noise

reduction)

the

remote

controller,

you

can

Operate

the

=

[37]

®

(stop/radio

off}

button

(ON/OFF)

selector

unit

on

the

buttons

on

the

unit.

"

[6]

4

(fast

-Feverse)

button

_

-

[28]

(fast-reverse)

button

>

PLAYIDIR

(playbacktape

transport

L14]

FM

ST/MONO

(FM

stereo/monaural)

[20]

Battery

connecting

points

fog]

me

(fast-forward)

button

fF

selector

[21]

TAPE

selector

al

direct

direction

change)

button

=

;

(30)

»

(playback/ftape

transport

direction

[3]

p>

(fast-forward)

button

115]

SCAN

+/—

(tuning)

button

{23}

RELEASE

(plug

release)

switch

change)

button

[3]

VOL

(volume)

contro!

[46]

ENTER

button

[23]

Battery

compartment

tor

lithium

(31}

VOL

(volume)

control

\17|

MODE

(tape

transport)

seiector

battery

(32]

HOLD

switch

118}

OPEN

button

[33]

REVFWD

indicator

—

3

—

eum

Oa

WM-702,/F702

SECTION

3

ADJUSTMENTS

3-1,

MECHANICAL

ADJUSTMENTS

PRECAUTION

1,

Clean

the

following

parts

with

a

denaturedalcohol-

moistened

swab:

playback’

head

rubber

belts

capstan

idlers

pinch

roller

2,

Demagnetize

the

playback

head

with

a

head

demagnetizer,

8,

Do

not

use

a

magnetized

screwdriver

for

the

adjustments,

4,

After

the

adjustments,

apply

suitable

locking

compound

to

the

parts

adjusted.

The

adjustments

should

be

performed

with

the

rated

power

supply

voltage

(1.3V)

unless

otherwise

noted,

ol

Torque

Measurement

Torque

Meter

CQ-102C

Meter

Reading

22~—38g-cm

0.31—0.52

oz

+

inch

FWD

Back

Tension

1,0-3.0g

+

cm

0.02—0.04

oz:

inch

22-38g+cm

0.31-0,52

oz

+

inch

CQ-102RB

REV

Back

Tension

1,0-3.0g

+

cm

0,02—0.04

oz:

inch

more

than

50g

-cm

more

than

0.7

02+

inch

CQ:201B

more

than

50g-cm

more

than

0.7

oz:

inch

Tape

Pulling

Force

Measurement

Meter

Reading

more

than

50g

more

than

1.77

oz

more

than

50g

more

than

1,77

oz

32,

ELECTRICAL

ADJUSTMENTS

PRECAUTION

1,

Power

supply

voltage

:

1,3V

2.

Switch

position

FM

MODE

switch

:ST

DOLBY

switch

:

OFF

DBB

switch:

OFF

3.

For

electrical

adjustments,

use

the

supplied

plug

coversion

adaptor

(Parts

No,

1-563-133-11),

Cassette

Section

TEST

TAPE

WS-48A

3kHz,

0dB

Tape

Speed

Adjustment

P-4-4100

10kHz,

~10dB

Playback

Head

Azimuth

check

P-4-A063

6.3kHz,

~10dB

P-4-L300

315Hz,

0dB

Playback

Level

Adjustment

Playback

Head

Azimuth

Check

Note:

This

set

is

not

featured

the

head

azimuth

adjustment,

When

replacing

the

head,

check

the

both

L-ch

and

R-ch

output

levels

and

also

those

phases,

Procedure

:

1,

Playback

mode,

test

tape

P-4-A100

VTVM

(10kHz,

—10dB)

Plug

conversion

adaptor

1)

Playback

the

P-4-Al00

in

FWD

mode

and

read

the

VTVM

(both

L-ch

and

R-ch),

2)

Change

to

REW

mode

and

read

the

VTVM

(both

L-ch

and

R-ch),

3)

Confirm

that

the

level

difference

between

step

1

and

2

is

within

SdB

(both

L-ch

and

R-ch),

2,

Phase

Check

7

test

tape

P-4-A063

(6.3kHz,

—

10dB)

oscilloscope

Screen

pattern

in

phase

45°

90°

135°

180°

eae

aera

good

wrong

Tape

Speed

Adjustment

Procedure

:

test

tape

WS-48A

(3kHz,

OdB)

frequency

counter

Plug

conversion

adaptor

1,

Playback

WS-48A

(tape

center

portion)

in

FWD

mode,

Adjust

the

RV601

so

that

the

frequency

counter

reads

3,000Hz+

15Hz,

2,

Playback

WS48A

(tape

center

portion)

in

REV

mode,

Confirm

that

the

reading

of

frequency

counter

is

within

2.0%

from

the

reading

in

step

1,

Adjustment

Parts

Location

Diagram

RV601

|

«

[Radio

Section)

(WM-F702

only)

AM

SECTION

BAND

switch

:

AM

digital

voltmeter

-

wa

(TUN

VOL)

t

|

te}

+

AM

TUNING

VOLTAGE

ADJUSTMENT

Adjust

for

following

values

on

digital

voltmeter

Bee

|

US

model

AEP,

UK,

ET,

AUS

model

AM

Tracking

Adjustment

AM

RF

SG

Put

the

lead-wire

antenna

close

to

Ww

the

set,

C7

30%

amplitude

modulation

by

400Hz

signal

VTVM

(range

:

0.5—5Vac)

Plug

conversion

adaptor

@

Repeat

the

procedures

in

each

adjustment

several

times,

andthe

tracking

adjustment

should

be

finally

done

by

the

trimmer

capacitors,

AM

TRACKING

ADJUSTMENT

Adjust

for

a

maximum

reading

on

VTVM.

US

model

ET,

AUS

Adjust

for

a

maximum

reading

on

VTVM.

FM

SECTION

¢

FM

Tuning

Voltage

Adjustment

BAND

switch:

FM

VCO

Adjustment

BAND

switch

:

FM

frequency

counter

TV

SECTION

(ET,

AUS

model)

TV

Tuning

Voltage

Adjustment

BAND

switch

:

TV

TP

oer

er

digital

(19kHz)

“#

W

T

=

voltmeter

aE

rd

"7

TP

(TUN

VOL)

[

.

SEA)

i

Procedure

:

alg

:

1,

Connect

an

electrolytic

capacitor

14F

between

TP

(DET

OUT)

and

ground,

WM-702,/F702

SECTION

4

DIAGRAMS

-.

4-1.

SEMICONDUCTOR

LEAD

LAYOUTS

XN4608

NJL5161K-B

:

V

TUNING

Vi

2.

Adjust

RV1

for

194£0.02kHz

on

the

counter.

TY

TONING

NOCI

AGE

AGUS

IMENL

XN4215

FM

TUNING

VOLTAGE

ADJUSTMENT

‘

z

.

Adjust

for

following

values

on

digital

voltmeter.

3.

Remove

electrolytic

capacitor

connected

in

step

1.

-

——

XN4501

Adjust

for

following

values

on

digital

voltmeter

TV

4CH

a

re

[RE

OK

mode

[ET

AUS

Dial

volineter

rsdn

GL102R6

—

s

=o

Fr

ae

=

on

NULL

Adjustment

Lo

|

Digital

voltmeter

reading

BAND

switch

:

FM

TV

Tracking

Adjustment

ee

Adjustment

part

FM

Tracking

Adjustment

FM

RF

SG

0.01

zp

F

-——

ANT

IN

TV

RF

SG

0.01

uF

ke

ANT

IN

FM

RF

SG

22.5kHz

frequency

22.5kHz

frequency

deviation

by

400Hz

deviation

by

400Hz

signal

0.01

uF

VTVM

MA110

MSM6404A-286

(de

range)

(range

:

0.5~5Vac)

ke———_

ANT

IN

22,5kHz

frequency

deviation

by

400Hz

signal

VTVM

(range

:

0.5-~5Vac)

Plug

conversion

adaptor

@

Repeat

the

procedures

in

each

adjustment

severa]

times,

and

the

tracking

adjustment

should

be

finally

done

by

the

trimmer

capacitors.

FM

TRACKING

ADJUSTMENT

Adjust

for

a

maximum

reading

on

VTVM.

Display

indication

FM

87,9MHz

FM

107.9MHz

SG

frequency

87.9MHz

107,9MHz

FM

87.5MHz

FM

108,0MHz

US

nodet

nod

ET,

AUS

Adjustment

part

NULL

ADJUSTMENT

Adjust

for

OV

reading

on

VTVM,

Ie

ADJUSTMENT

LOCATION

-radio

board—

TP

Piug

conversion

adaptor

@

Repeat

the

procedures

in

each

adjustment

several

times,

and

the

tracking

adjustment

should

be

finally

done

by

the

trimmer

capacitors.

(TUN

VOL)

1P

TP

°

¢

SEMICONDUCTOR

LOCATION

—CASSETTE

SECTION—

1C101

D-19

WM-702

Q801

WM-F702

Q801

(18kHz)

(DET

OUT)

24

ct4

avi.

TTE

SECTION—

E

—CASS

42,

PRINTED

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0

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-

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Sony WALKMAN WM-702 User manual

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