Sony Tc-w421 User manual

TC-W421

SERVICE

MANUAL

US

Model

Canadian

Model

E

Model

TC-W421

is

the

cassette

deck

section

of

the

stereo

component

system

SEN-421CD.

Model

Name

Using

Similar

Mechanism

|

HST-121/221

Tape

Transport

Mechanism

Type

TCM-180VW-H5

SPECIFICATIONS

Recording

system

4-track

2-channel

stereo

Frequency

response

(DOLBY

NR

OFF)

With

TYPE

Il

cassette

(Sony

UCX-S):

30

—

14,000

Hz

(+3

dB)

With

TYPE

|

cassette

(Sony

HF-S):

30

—

13,000

Hz

(+3

dB)

Wow

and

flutter

0.12%

WRMS

(NAB)

Dimensions

Approx.

430

x

120

x

280

mm

(w/h/d)

(17

x

4°/,

x

11*/,

inches)

Weight

Approx.

3.5

kg

(7

Ib

12

oz)

net

Design

and

specifications

are

subject

to

change

without

notice.

Dolby

noise

reduction

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

“DOLBY”

and

the

double-D

symbol

9

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

STEREO

CASSETTE

DECK

SONY.

TC-W421

|

TABLE

OF

CONTENTS

Section

Title

Page

Specifications

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1.

GENERAL.

««ssseevisssvesee

seep

ateeeens

2

2.

ADJUSTMENTS

2-1.

Mechanical

Adjustment

-++++++++++++eeeeee

3

2-2.

Electrical

Adjustments

-+-+++++++++ee

eee

eeeee

3

3.

DIAGRAMS

3.]

.

Block

Diagram

Ce

eee

er

ee

7

3-2.

Printed

Wiring

Boards

++++++++rerr

eer

ee

eres

9

3.3,

Schematic

Diagram

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a

1]

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4,

EXPLODED

VIEWS

alee

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15

5.

ELECTRICAL

PARTS

LIST

------------

18

SECTION

1

GENERAL

PARTS

IDENTIFICATION

—

Front

Panel

—

Deck

A

TAPE

SELECTOR

Deck

B

PEAK

LEVEL

METER

Deck

A

Deck

B

TAPE

SELECTOR

eee

or

oe

EE

Deck

A

REC

LEVEL

control

Tape

operation

buttons

DUBBING

SPEED

selector

Deck

B

;

Tape

operation

buttons

DOLBY

NR

switch

TC-W421

SECTION

2

ADJUSTMENTS

2-1.

MECHANICAL

ADJUSTMENT

PRECAUTION

1.

Clean

the

following

parts

with

a

denatured-alcohol-moistened

swab:

record/playback

head

pinch

rollers

erase

head

rubber

belts

capstan

idler

2.

Demagnetize

the

record/playback

head

with

a

head

demagnetizer.

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

in

the

rated

power

supply

voltage

unless

otherwise

noted.

w&

Torque

Measurement

Torque

Meter

reading

30

—

70

gecm

(0.42

—

0.97

ozeinch)

FWD

back

tension

CQ-102C

(0.01

ni

063

seaacl)

70

—

160

gecm

FF,

REW

CQ-201B

(0.97

—

2.21

ozeinch)

2-2.

ELECTRICAL

ADJUSTMENTS

Note:

The

adjustment

should

be

performed

in

the

order

given

in

the

service

manual.

As

a

rule,

adjustments

about

playback

should

be

performed

before

those

about

recording.

The

adjustments

should

be

performed

for

L-CH

and

R-CH.

@

Switches

and

controls

should

be

set

as

follows

unless

otherwise

specified.

DOLBY

NR

switch:

OFF

@

Standard

Record:

Deliver

the

standard

input

signal

level

to

the

input

jack

and

set

the

REC

LEVEL

control

to

obtain

the

standard

output

signal

level.

~

Record

Mode

--

AF

OSC

LINE

OUT

LINE

OUT

CN601

@

(R-ch)

CN601

@

(R-ch)

@

(R-ch)

©

(R-ch)

0

dB=0.775

V

e

Standard

Input

Level

‘

LINE

IN

Input

level

0.25

V

(

~

10

dB)

LINE

OUT

7

(CN601

Pin@,@)

Output

level

0.32

V

(

—

7.7

dB)

e

Standard

Output

Level

Output

terminal

®

Test

tape

WS

TC-W421

Record/Playback

Head

Azimuth

Adjustment

Procedure:

1.

Mode:

Playback

test

tape

P-4-A100

(10

kHz,

—

10

dB)

PERE:

LINE

OUT

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

1

dB.

within

R-CH

peak

screw

position

L-CH

R-CH

angle

peak

3.

Phase

Check

Mode:

Playback

test

tape

P-4-A100

(10

kHz,

~

10

dB)

L-CH

oscilloscope

LINE

OUT

Screen

pattern

in

phase

45°

90°

135°

180°

Ry

teal

Nemnntiemnnmnyaarmnnnncmnnd

good

;

wrong

4.

After

the

adjustment,

lock

the

screws

with

locking

compound.

Adjustment

Location:

Record/Playback

head

Adjustment

|

eee)

(DECK

A)

"NT

HRP901

(DECK

B)

Gi

a

SX

@

Press

»

(PLAY)

button.

Tape

Speed

Adjustment

Procedure:

Mode:

Playback

Perform

high

speed

adjustment

before

normal

speed

adjustment.

test

tape

WS-48B

frequency

counter

(3

kHz,

0

dB)

LINE

OUT

(high

speed

adjustment)

1.

Set

to

FWD

playback

mode.

2.

Short

test

CN504

on

Main

board.

3.

Adjust

RV501

on

main

board

so

that

the

frequency

counter

reading

becomes

6,000

+

60

Hz.

4.

After

adjustment,

disconnect

CN504

shorted

in

step

2.

(normal

speed

adjustment)

1.

Set

to

FWD

playback

mode.

2.

Adjust

RV502

on

Main

board

so

that

the

frequency

counter

reading

becomes

3,000

+

30

Hz.

Frequency

difference

between

the

begining

and

the

end

of

the

tape

should

be

within

5%.

Adjustment

Location:

main

board

(See

Page

6.)

Playback

Level

Adjustment

Procedure:

Mode:

Playback

test

tape

P-4-L300

(315

kHz,

0

dB)

PERE

LINE

OUT

Adjust

RV101

(L-ch)

and

RV201

(R-ch)

for

DECK

A

and

RV102

(L-ch)

and

RV202

(R-ch)

for

DECK

B

so

that

the

reading

on

VTVM

meets

the

adjustment

limits

below.

Adjustment

Limits:

LINE

OUT

level:

—

7.7

+

0.5

dB

(0.30

—

0.34

V)

Level

difference

between

channels:

less

than

0.5

dB

Check

that

the

LINE

OUT

level

does

not

change

even

if

Playback

and

Stop

operation

is

repeated

several

times.

Adjustment

Location:

Main

board

(See

Page

6.)

Record

Bias

Adjustment

|DECK

B

Starting:

REC

LEVEL

control:

Standard

Record

(See

page

3.)

Procedure:

1.

Mode:

Record

AF

OSC

-

~~

attenuator

10kQ

+O0—O

©

600

Q

LINE

IN

1)

315

Hz

_

D

oute

}

24.5

mV

(~

30

dB)

CS-122

not

record

portion

2.

Mode:

Playback

recorded

portion

PERE

LINE

OUT

3.

Playback

the

signal

recorded

in

step

1.

Confirm

that

the

10

kHz

playback

output

is

0

+

0.5

dB

relative

to

the

315

Hz

output.

If

necessary,

adjust

RV403

(L-ch)

and

RV503

(R-ch)

and

repeat

the

steps

given

above.

Adjustment

Location:

main

board

(See

Page

6.)

TC-W421

Record

Level

Adjustment

|DECK

B

Starting:

REC

LEVEL

control:

Standard

Record

(See

page

3.)

Procedure:

1.

Mode:

Record

AF

OSC

CS-122

C9

not

record

portion

~

attenuator

10

kQ

etlheo

O00]

ly

set

os

600

(2

LINE

IN

315

Hz,

69.1

mV

(—

21

dB)

2.

Mode:

Playback

recorded

portion

PET:

LINE

OUT

3.

Playback

the

signal

recorded

in

step

1.

Confirm

that

signal

level

is

within

the

adjustment

limits

below.

If

necessary,

adjust

RV141

(L-ch)

and

RV241

(R-ch)

and

repeat

the

step

1

—

2.

Adjustment

Limits:

—

22.7

dB

+

0.5

dB

(53.6

—

60.2

mV)

Adjustment

Location:

main

board

(component

side)

(See

Page

6.)

TC-W421

e

Adjusting

Parts

Location

{MAIN

BOARD]

—

Component

Side

—

TAPE

SPEED

@

CN504

RV502

TAPE

SPEED

NORMAL

+)

RV101

PLAYBACK

LEVEL

(DECK

A)

)

RV201

€>

RV141

RECORD

LEVEL

@>

RV241

RV403 RV503

)

RV102

RECORD

BIAS

PLAYBACK

LEVEL

(DECK

B)

+)

RV202

SECTION

3

DIAGRAMS

3-1.

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NOTE:

_@

-XX

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-X

mean

standardized

parts,

so

they

may

have

some

difference

from

the

original

one.

@®

Color

Indication

Example:

KNOB,

BALANCE

(WHITE)...

(RED)

+

t

of

Appearance

Parts

Color

Cabinet’s

Color

SECTION

4

EXPLODED

VIEWS

@

Items

marked

“>”

are

not

stocked

since

they

are

seldom

required

for

routine

service.

Some

delay:

should

be

anticipated

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items.

@

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with

no

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number

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not

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®

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mark)

list

is

given

in

the

last

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this

parts

list.

_

(1)

FRONT

PANEL

AND

CHASSIS

SECTION

Ref.

No.

10

12

Part

No.

Description

|

4-949-640-11

KNOB

(DIA.

21)

A-4325-437-A

LID

(B)

ASSY,

CASSETTE

(US)

A-4325-439-A

LID

(B)

ASSY,

CASSETTE

(Canadian,

E)

A-4325-436-A

LID

(A)

ASSY,

CASSETTE

(US)

A-4325-438-A

LID

(A)

ASSY,

CASSETTE

(Canadian,

E)

3-7103-T10-41

STICKER,

SONY

SYMBOL

(12)

A-2004-012-A

PANEL

ASSY,

FRONT

(US)

A-2004-013-A

PANEL

ASSY,

FRONT

(Canadian)

A-2004-014-A

PANEL

ASSY,

FRONT

(E)

4-949-639-01

BUTTON

(BLOCK

B)

4-949-638-01

BUTTON

(BLOCK

A)

4~928-635-21

SCREW,

+BV

(2.

6X10)

TAPPING

3-375-844-01

BRACKET

(CASE)

3-363-099-01

SCREW

(CASE

+3X8

TP2)

4-943-088-71

CASE

4-886-821-11

SCREW,

S

TIGHT,

+PTTWH

3X6

—15-

Ref.

No.

*

13

14

15

16

&

*

16

17

18

19

20

*

21

*

22

supplied

Part

No.

Description

Remark

A-2006-717~A

MAIN

BOARD,

COMPLETE

1-690-674-21

CORD

(WITH

CONNECTOR)

(US)

1-690-672-11

CORD

(WITH

CONNECTOR)

(US)

3-375-840-01

PANEL,

BACK

(US)

3-375-840-11

PANEL,

BACK

(Canadian)

3-375-840-21

PANEL,

BACK

(E)

X-4941-228-1

FOOT

ASSY

1-590-243-11

WIRE,

FLAT

TYPE

(21

CORE)

4-949-658-01

BUTTON

(TC)

4-948-273-01

KNOB,

SLIDE

1-642-591-11

METER

BOARD

3-346-265-11

HOLDER,

PC

BOARD

Sony TC-W421 User manual

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