Sony WM-DD User manual

Table of contents

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SPECIFICATIONS

Power

Requirements:

3

V

dc

Internal

batteries:

IEC

designation

R6

(size

A

A)

x

2

AC

power

adaptor:

Refer

to

the

following

chart

to

choose

the

correct

adaptor

for

your

area.

Country

Ac

power

line

voltage

Optional

ac

power

adaptor

US

Canadian

120

Vac,

60

Hz

AC-39

available

in

the

U.S.A.

and

Canada

UK

240

Vac,

50

Hz

AC-37

available

in

the

United

Kingdom

AEP

220

V

ac,

50

Hz

AC-37

available

in

European

countries

E

120

Vac,

(110,220

or

240

V

ac,

adjustable

by

Sony

personnel),

50/60

Hz

110,120,

220

or

240

V

ac,

adjustable,

50/60

Hz

AC-38

available

in

Japan

AC-38

available

in

other

countries

12

V

car

battery:

Sony

DCC-127A*

car

battery

cord

*For

connection

with

the

DCC-127A,

the

optional

PC-

200

dc

plug

adaptor

is

required.

Battery

Life

(continuous

playback

hours):

Approx.

9

hours

with

supplied

Sony

Eveready

AM3

alkaline

batteries

For

maximum

performance

we

recommend

the

use

of

alkaline

bat¬

teries.

Dimensions:

Approx.

79

x

109.2

x

29

mm

(w/h/d)

(3i/s

x4s/

16

x

13/ie

inches)

not

incl.

projecting

parts

and

controls

Weight:

Approx.

290g

(IO

1

/4

oz)

incl.

batteries,

not

inch

other

accessories

MICROFILM

Tape

Track:

Fast

Winding

Time:

Frequency

Response:

Wow

and

Flutter:

Power

output:

Output:

4-track

2-channel

stereo

Approx.

2min.

with

Sony

Cassette

C-60

40

—

15,000

Hz

(with

the

TAPE

selector

+

tn

METAL*

set

t0

CrOj

1

40

—

12,000

Hz

(with

the

TAPE

selector

set

to

NORM)

±0.13%

(DIN)

0.08%

WRMS

(NAB)

25

mWx

2

(max.)

20

mW

x

2

(at

10%

harmonic

distortion)

at

dc

operation

Headphone

jacks

(stereo

minijack)

...

2

load

impedance

8

—

300

ohms

Tape

Transport

Mechanism

Type

MT-WMDD-24

SERVICE

MANUAL

WM-DD

PARTS

IDENTIFICATION

O

VOLUME

control

0

HEADPHONES

jacks

(stereo

minijacks)

©

►

►

REW

(rewind)

button

0^4

FF

(fast

forward)

button

0<4

PLAY

(playback)

button

0

Lock

button

(to

secure

the

cassette

panel)

0

DC

IN

3

V

(external

power

input)

jack

©

BATTERY

indicator

©

■

STOP

button

0

TAPE

selector

0

Battery

compartment

(inside)

©

Cassette

panel

FEATURE

•

Capable

of

selecting

NORM

or

position

by

type

of

tape

in

use.

•

DD

(Disc

Drive)

system

that

has

superior

anti-roll¬

ing

effect

and

low

wow

and

flutter

has

been

em¬

ployed.

•

Auto

shut-

off

mechanism

in

FWD

mode

and

auto

off

mechanism

in

FF,

REW

modes.

i

■

t

2

Chip

components

Chip

components

include

resistors,

capacitors,

transistors,

diodes,

coil

and

adjustable

resistors.

In

this

section,

the

types

of

resistors,

ceramic

capacitors,

transistors

and

diodes

which

are

used

most

frequently

will

be

described.

Dimension

of

transistors

and

capacitors

Type

L

W

T

3216

3.2

1.6

0.45

~

0.6

2125

2.0

1.25

0.35-0.5

Identification

electrode

ceramic

base

side

(white

color)

electrodes

Resistor

Laminated

Ceramic

Capacitor

Transistor

Diode

Replacing

chip

components

All

chip

components

should

be

connected

and

disconnect¬

ed,

using

a

tapered

soldering

iron

[temperature

of

the

iron

tip:

less

than

280°C

(536°F)],

a

pair

of

tweezers

and

braid¬

ed

wire.

Precautions

for

replacement

1.

Do

not

disconnect

the

chip

component

forcefully.

Otherwise,

the

pattern

may

peel

off.

2.

Never

re-use

a

disconnected

chip

component.

Dispose

of

all

old

chip

components.

3.

To

protect

the

chip

component,

heating

time

for

attach¬

ing

the

component

should

be

within

3

seconds.

o

Removing

chip

components

(1)

R

emoving

solder

at

electrode

Remove

the

solder

at

the

electrode,

using

a

thin

braided

wire.

Do

not

remove

the

solder

of

the

part

(chip

component)

attached

adjacent

to

the

electrode.

(2)

D

i

sconnecting

chip

components

Turn

the

tweezers

with

the

soldering

iron

alternately

applied

to

both

electrodes,

and

the

chip

component

will

be

disconnected.

Take

careful

precautions

while

disconnecting,

because

if

the

chip

component

is

force¬

fully

removed

the

land

may

peel

off.

Never

re-use

a

disconnected

chip

component.

/

Turn

(3)

S

moothing

the

soldered

surface

After

disconnecting

the

chip

component,

remove

the

solder

by

using

a

braided

wire

to

smooth

the

land

surface.

o

Connecting

chip

components

The

value

of

chip

components

is

not

displayed

on

the

main

body.

Take

due

precautions

to

avoid

mixing

new

chip

components

with

other

ones.

(1)

A

pplying

solder

to

land

on

one

side

Apply

a

thin

layer

of

solder

to

the

land

on

one

side

where

the

chip

component

is

to

be

connected.

Too

much

solder

may

cause

bridging.

Small

quantity

of

solder

(2)

S

peedy

soldering

Hold

the

chip

component

at

the

desired

position,

using

tweezers,

and

apply

the

soldering

iron

in

the

arrow-marked

direction.

To

protect

the

chip

compo¬

nent,

heating

time

should

be

within

3

seconds.

Land

prin

ted

circui

t

board

(3)

S

p

eedy

soldering

of

electrode

on

the

other

side

Solder

the

electrode

on

the

other

side

in

the

same

way

as

in

(2)

above.

WM-DD

2-1.

FWD

mode

SECTION

2

MECHANICAL

OPERATION

head

chassis

WM-DD

WM-DD

WM-DD

1.

Motor

section

installation

0

Tighten

loosely

@

Tighten

firmly

Wow

&

flutter

and

motor

position

1.

Adjust

with

the

thrust

screw

so

that

rotor

thrust

play

is

within

0.1

mm.

(When

confirming

play,

press

motor

down

so

that

the

motor

pulley

and

rotor

rubber

section

do

not

touch.)

2.

Adjust

with

the

adjustment

screw

so

that

con¬

sumed

current

satisfies

the

value

below

in

FWD

mode.

Consumed

current:

Approx.

5

mA

higher

current

than

mini¬

mum

point,

in

tightening

direction.

Note:

If

the

adjustment

screw

is

loosened

too

much,

adjustment

will

be

impossible.

Perform

adjustment

within

5

turns

from

the

tightened

state.

3.

Confirm

that

the

wow

meter

value

is

0.08%W*

RMS.

Conditions:

—

FWD

state

—

power

supply

voltage:

2.5

V

-tape:

WS-48

(3

kHz,

0

dB)

Use

portion

near

the

end.

4.

At

2

V

power

supply

voltage,

confirm

normal

FWD

operation.

5.

When

@

and

@

are

not

satisfied,

repeat

ad¬

justment

again

starting

with

“Motor

Section

Installation”.

O

Tighten

screw

loosely.

©

Tighten

screw

while

pressing

the

motor

section

lightly

in

in

the

direction

of

the

arrow.

©

Tighten

the

screw.

Press

down

adjustment

screw

adjustment

screw

4-2.

ELECTRICAL

ADJUSTMENTS

Head

Height

Adjustment

1.

Prepare

an

adjustment

cassette

as

shown

below.

C-120

tape

cassette

portions.

2.

In

playback

mode

and

viewing

from

the

front,

adjust

the

head

heights

to

eliminate

tape

curl

and

tape

twist

at

portions

shown

by

the

arrow.

~8

rCZT

m.

—

7

1

tape

guide

U

playback

head

—n

3r

3-578-138-01

(t=

0.1)

3-578-138-11

ft

=0.2)

Shim,

head

height

adjustment

3.

If

necessary,

adjust

the

height

of

the

tape-guide

by

turning

the

adjustment

screw.

adjustment

screw

4.

Apply

locking

compound

on

adjustment

screw.

Playback

Head

Azimuth

Adjustment

Procedure:

1.

Mode:

playback

test

tape

P-4-A81

(6.3kHz,-10dB)

HEADPHONES

2.

Turn

the

adjustment

screw

for

the

maximum

output

levels.

If

these

levels

do

not

match,

turn

the

adjustment

screw

until

both

of

output

levels

match

together

within

0.5

dB.

output

levels

within

J

0.5

dB^

Screw

^

■

—

position

3.

Phase

Check

Mode:

playback

test

P-4-A81

(6.3

kHz,

-10dB)

L-CH

R-CH

peak

peak

33

£2

oscilloscope

HEADPHONES

Screen

pattern

0@©

®Q

(

i

n

phase

45°

90°

f

13

5°

180°,

good

wrong

Adjustment

Location:

12

SECTION

3

DISASSEMBLY

Note:

Follow

the

disassembly

procedure

in

the

numerical

order

given.

CONTROL

PANEL

CASSETTE

PANEL

(Compression

coil

Installation)

Control

panel

can

be

removed

together

with

cassette

panel.

screw

O

precision

screw

P

1.4x3.5,

TYPE

1

©

precision

screw

P

1.4

x

2.5,

TYPE

1

screw

©

Depress

the

FF

and

REWbuttons.

control

panel

AUDIO

BOARD

HOLDER

©

precision

screw

P

1.4x3

5

(TYPE

3)

Turn

the

holder

a

half

turn

in

the

direction

shown

by

the

arrow,

and

remove

the

holder

taking

care

to

protruding

parts.

(With

main

board

removed)

Be

careful

not

to

lose.

©

precision

screw

P

1.4x2,

TYPE

1

Mechanism

section

Main

Board

Be

careful

not

to

lose.

protruding

part

protruding

part

©

wire

holder

0

wire

holder

©

Raise

up

the

circuit

board

taking

care

not

to

break

the

lead

wires.

A

precision

screw

P

1.4x2,

TYPE

1

holder

Pinch

roller

and

head

can

be

replaced.

Mechanism

section

can

be

checked.

SECTION

4

ADJUSTMENTS

PRECAUTION

1.

Clean

the

following

parts

with

a

denatured-

alcohol-moistened

swab:

playback

head

pinch

roller

capstan

rubber

belts

2.

Demagnetize

the

playback

head

with

a

head

demagnetizer.

3.

Do

not

use

a

magnetized

screwdriver

for

the

adjustments.

4.

After

the

adjustments,

apply

suitable

locking

compound

to

the

parts

adjusted.

5.

The

adjustments

should

be

performed

with

the

rated

power

supply

voltage

unless

otherwise

noted.