Sony WM-DD User manual

SPECIFICATIONS

Power

Requirements:

Internal

batteries:

IEC

designation

(size

power

adaptor:

Refer

the

following

chart

choose

the

correct

adaptor

for

your

area.

Country

power

line

voltage

Optional

power

adaptor

Canadian

120

Vac,

AC-39

available

the

U.S.A.

and

Canada

240

Vac,

AC-37

available

the

United

Kingdom

AEP

220

ac,

AC-37

available

European

countries

120

Vac,

(110,220

240

ac,

adjustable

Sony

personnel),

50/60

110,120,

220

240

ac,

adjustable,

50/60

AC-38

available

Japan

AC-38

available

other

countries

car

battery:

Sony

DCC-127A*

car

battery

cord

*For

connection

with

the

DCC-127A,

the

optional

PC-

200

plug

adaptor

required.

Battery

Life

(continuous

playback

hours):

Approx.

hours

with

supplied

Sony

Eveready

AM3

alkaline

batteries

For

maximum

performance

recommend

the

use

alkaline

bat¬

teries.

Dimensions:

Approx.

109.2

(w/h/d)

(3i/s

x4s/

13/ie

inches)

not

incl.

projecting

parts

and

controls

Weight:

Approx.

290g

(IO

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

—

15,000

(with

the

TAPE

selector

METAL*

set

CrOj

—

12,000

(with

the

TAPE

selector

set

NORM)

±0.13%

(DIN)

0.08%

WRMS

(NAB)

mWx

(max.)

(at

10%

harmonic

distortion)

operation

Headphone

jacks

(stereo

minijack)

...

load

impedance

—

300

ohms

Tape

Transport

Mechanism

Type

MT-WMDD-24

SERVICE

MANUAL

WM-DD

PARTS

IDENTIFICATION

VOLUME

control

HEADPHONES

jacks

(stereo

minijacks)

►

REW

(rewind)

button

0^4

(fast

forward)

button

0<4

PLAY

(playback)

button

Lock

button

(to

secure

the

cassette

panel)

(external

power

input)

jack

BATTERY

indicator

■

STOP

button

TAPE

selector

Battery

compartment

(inside)

Cassette

panel

FEATURE

•

Capable

selecting

NORM

position

type

tape

use.

•

(Disc

Drive)

system

that

has

superior

anti-roll¬

ing

effect

and

low

wow

and

flutter

has

been

em¬

ployed.

•

Auto

shut-

off

mechanism

FWD

mode

and

auto

off

mechanism

FF,

REW

modes.

■

Chip

components

Chip

components

include

resistors,

capacitors,

transistors,

diodes,

coil

and

adjustable

resistors.

this

section,

the

types

resistors,

ceramic

capacitors,

transistors

and

diodes

which

are

used

most

frequently

will

described.

Dimension

transistors

and

capacitors

Type

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

connected

and

disconnect¬

ed,

using

tapered

soldering

iron

[temperature

the

iron

tip:

less

than

280°C

(536°F)],

pair

tweezers

and

braid¬

wire.

Precautions

for

replacement

not

disconnect

the

chip

component

forcefully.

Otherwise,

the

pattern

may

peel

off.

Never

re-use

disconnected

chip

component.

Dispose

all

old

chip

components.

protect

the

chip

component,

heating

time

for

attach¬

ing

the

component

should

within

seconds.

Removing

chip

components

(1)

emoving

solder

electrode

Remove

the

solder

the

electrode,

using

thin

braided

wire.

not

remove

the

solder

the

part

(chip

component)

attached

adjacent

the

electrode.

(2)

sconnecting

chip

components

Turn

the

tweezers

with

the

soldering

iron

alternately

applied

both

electrodes,

and

the

chip

component

will

disconnected.

Take

careful

precautions

while

disconnecting,

because

the

chip

component

force¬

fully

removed

the

land

may

peel

off.

Never

re-use

disconnected

chip

component.

Turn

(3)

moothing

the

soldered

surface

After

disconnecting

the

chip

component,

remove

the

solder

using

braided

wire

smooth

the

land

surface.

Connecting

chip

components

The

value

chip

components

not

displayed

the

main

body.

Take

due

precautions

avoid

mixing

new

chip

components

with

other

ones.

(1)

pplying

solder

land

one

side

Apply

thin

layer

solder

the

land

one

side

where

the

chip

component

connected.

Too

much

solder

may

cause

bridging.

Small

quantity

solder

(2)

peedy

soldering

Hold

the

chip

component

the

desired

position,

using

tweezers,

and

apply

the

soldering

iron

the

arrow-marked

direction.

protect

the

chip

compo¬

nent,

heating

time

should

within

seconds.

Land

prin

ted

circui

board

(3)

eedy

soldering

electrode

the

other

side

Solder

the

electrode

the

other

side

the

same

way

(2)

above.

WM-DD

2-1.

FWD

mode

SECTION

MECHANICAL

OPERATION

head

chassis

WM-DD

Motor

section

installation

Tighten

loosely

Tighten

firmly

Wow

flutter

and

motor

position

Adjust

with

the

thrust

screw

that

rotor

thrust

play

within

0.1

mm.

(When

confirming

play,

press

motor

down

that

the

motor

pulley

and

rotor

rubber

section

not

touch.)

Adjust

with

the

adjustment

screw

that

con¬

sumed

current

satisfies

the

value

below

FWD

mode.

Consumed

current:

Approx.

higher

current

than

mini¬

mum

point,

tightening

direction.

Note:

the

adjustment

screw

loosened

too

much,

adjustment

will

impossible.

Perform

adjustment

within

turns

from

the

tightened

state.

Confirm

that

the

wow

meter

value

0.08%W*

RMS.

Conditions:

—

FWD

state

—

power

supply

voltage:

2.5

-tape:

WS-48

kHz,

dB)

Use

portion

near

the

end.

power

supply

voltage,

confirm

normal

FWD

operation.

When

and

are

not

satisfied,

repeat

ad¬

justment

again

starting

with

“Motor

Section

Installation”.

Tighten

screw

loosely.

Tighten

screw

while

pressing

the

motor

section

lightly

the

direction

the

arrow.

Tighten

the

screw.

Press

down

adjustment

screw

adjustment

screw

4-2.

ELECTRICAL

ADJUSTMENTS

Head

Height

Adjustment

Prepare

adjustment

cassette

shown

below.

C-120

tape

cassette

portions.

playback

mode

and

viewing

from

the

front,

adjust

the

head

heights

eliminate

tape

curl

and

tape

twist

portions

shown

the

arrow.

rCZT

—

tape

guide

playback

head

—n

3-578-138-01

(t=

0.1)

3-578-138-11

=0.2)

Shim,

head

height

adjustment

necessary,

adjust

the

height

the

tape-guide

turning

the

adjustment

screw.

adjustment

screw

Apply

locking

compound

adjustment

screw.

Playback

Head

Azimuth

Adjustment

Procedure:

Mode:

playback

test

tape

P-4-A81

(6.3kHz,-10dB)

HEADPHONES

Turn

the

adjustment

screw

for

the

maximum

output

levels.

these

levels

not

match,

turn

the

adjustment

screw

until

both

output

levels

match

together

within

0.5

dB.

output

levels

within

0.5

dB^

Screw

■

—

position

Phase

Check

Mode:

playback

test

P-4-A81

(6.3

kHz,

-10dB)

L-CH

R-CH

peak

£2

oscilloscope

HEADPHONES

Screen

pattern

0@©

®Q

(

phase

45°

90°

5°

180°,

good

wrong

Adjustment

Location:

SECTION

DISASSEMBLY

Note:

the

disassembly

procedure

the

numerical

order

given.

CONTROL

PANEL

CASSETTE

PANEL

(Compression

coil

Installation)

Control

panel

can

removed

together

with

cassette

panel.

screw

precision

screw

1.4x3.5,

TYPE

precision

screw

1.4

2.5,

TYPE

screw

Depress

the

and

REWbuttons.

control

panel

AUDIO

BOARD

HOLDER

precision

screw

1.4x3

(TYPE

Turn

the

holder

half

turn

the

direction

shown

the

arrow,

and

remove

the

holder

taking

care

protruding

parts.

(With

main

board

removed)

careful

not

lose.

precision

screw

1.4x2,

TYPE

Mechanism

section

Main

Board

careful

not

lose.

protruding

part

protruding

part

wire

holder

wire

holder

Raise

the

circuit

board

taking

care

not

break

the

lead

wires.

precision

screw

1.4x2,

TYPE

holder

Pinch

roller

and

head

can

replaced.

Mechanism

section

can

checked.

SECTION

ADJUSTMENTS

PRECAUTION

Clean

the

following

parts

with

denatured-

alcohol-moistened

swab:

playback

head

pinch

roller

capstan

rubber

belts

Demagnetize

the

playback

head

with

head

demagnetizer.

not

use

magnetized

screwdriver

for

the

adjustments.

After

the

adjustments,

apply

suitable

locking

compound

the

parts

adjusted.

The

adjustments

should

performed

with

the

rated

power

supply

voltage

unless

otherwise

noted.

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