Sony TC-640 User manual

Table of contents

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Power

Requirements:

Track

System:

Reel

Size:

Tape

Speed:

Recording

Time:

(with

1,800

ft.

tape)

Frequency

Response:

we

Signal-to-Noise

Ratio:

SPECIFICATIONS

AC

100

V,110V,117V,

120

V,

125

V,

220

V,

240

V

50/60

Hz,

80

W

(for

General

Export)

AC

117

V,

60

Hz,

80

W

(for

USA)

Four-track

stereo

and

mono

7”

(18

cm)

maximum

Inputs:

7%

ips

and

3%

ips

(19

cm/s

and

9.5

cm/s)

4-track 4-track

Tape

speed

stereo.

mono

7%

ips

1.5hrs

3hrs

(19

cm/s)

3%

ips

3hrs

6

hrs

Outputs:

(9.5

cm/s)

5

30

~

20,000

Hz

at

7%

ips

(19

cm/s)

30

~

15,000

Hz

at

3%

ips

(9.5

cm/s}

{with

standard

tape)

20

~

25,000

Hz

at

7%

ips

(19

cm/s)

30

~

18,000

Hz

at

3%

ips

(9.5

¢m/s)

(with

SONY

SLH

tape)

Weight:

52

dB

(with

standard

tape)

55

dB

(with

SONY

SLH

tape)

Flutter

and

Wow:

Recording

Bias

Frequency:

Semiconductors:

Dimensions:

8

[ISO)

Set

using

1SO

screws

0.07

%

(WRMS)

at

7%

ips

(19

cm/s)

0.11

%

(WRMS)

at

3%

ips

(9.5

cm/s)

120

kHz

Two

MICROPHONE

inputs

Impedance;

600

Maximum

sensitivity:

0.19

mV

(—72

dB)

Two

LINE

INPUTs

Impedance;

100

k{2

Maximum

sensitivity;

60

mV

(—22

dB)

Two

LINE

OUTPUTs

Impedance;

100kQ2

,

Output

level;

0.775

V

(0

dB)

HEADPHONE

output

Impedance;

8

Output

level;

38

mV

(—26

dB)

with

8

92

load

22-transistors

and

8-diodes

1417/32(w)

x

159/16(H)

x

919/32"

(D)

(369

x

395

x

243.5

mm)

33

Ib

2

0z

(15

kg)

SON

Ye

SERVICE

MANUAL

Section

Title

Specifications

1.

GENERAL

DESCRIPTION

1-1.

1-2.

Block

Diagram

Major

Parts

Locations

2.

DISASSEMBLY.............

3.

FREQUENCY

ADAPTATION

4.

MAINTENANCE

4-1.

Lubrication

..........

4-2.

Cleaning

eerie

bea

Bees

4-3.

Demagnetizing.........

5.

ADJUSTMENT

PROCEDURES

5-1,

5-2.

Mechanical

Adjustments.

...

Electrical

Adjustments.

...

6.

DIAGRAMS

6-1.

Schematic

Diagram

.....

6-2.

Mounting

Diagram

6-2-1.

REC

BIAS

Circuit

Board

.

.

6-2-2.

PB

AMP

Circuit

Board...

.

6-2-3.

System

Control

Circuit

Board

TABLE

OF

CONTENTS

Page

Section

Title

:

]

6-2-4.

REC

MODE

Circuit

Board

6-2-5.

SOS

&

ECHO

Circuit

Board

6-2-6.

Resistor

Terminal

......

3

6-3.

Level

Diagram.

.......

4~5

7.

SEMICONDUCTOR

ELECTRODES...

.

6

8.

ELECTRICAL

PARTS

LIST

....

:

6

9.

EXPLODED

VIEWS

9-1.

Cabinet

-

topview-—

....

7

9-2.

Amp

Chassis

:

7

—topview(l)-.....

‘

7

9-3.

Head

Deck

—top

view(1)

..

;

9-4.

Head

Deck

—top

view(2)

....

9-5.

Printed

Circuit

Board

—topview-—.......

8~11

9-6.

Chassis

—topview~.....

12~24

9-7.

Chassis

—bottom

view

~—.

. .

9-8.

Jack

Panel

.........

9-9,

Packing

20

5

Se

ee

5~28

é

10.

HARDWARES

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

29~32

Hardware

Nomenclature

.......

33~36

37~38

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japoyy

Ju0dx

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jessuad

40}

papinosd

Ss}

(gOEP)

40;9aUUCD

gg/D3H

BULL

as

t

na

&}

9

‘GOES

MS

.JGOW

22H

“B

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i

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tkL

‘OLLO

980

SVId

:210N

zoes

MS

YOLINOW

oO

FOHNOS

ce

No

©

FdVL

LfdLNO

INIT

AGE

SNA

a.

—-

©

[

IN

2

O

oO

a

waLaW

AA

60Z0

8020

L0z0

9020

|

8010

£010

9010

21w)

solo

—

Q

dNV

JNOHIGVFH

dWV

INIT

dWV

OF

ad

|

dW

037

934

dw

XIW

dW

JIN

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Lu

x

”

oc

sos

£088

Lu

A

MS

a

{

oOHOF

8

SOS

Lu

VR-O

OHOI

re

yrs

40}28UU09

Gd/IFY

80er

JNOHdAV3H

{_

ZOES

9

22¥NOS

2068S

°

1vWHON

@-

4

cy

en

MS

193738

=

5

Pidaas

5

LNdLNo

ANIT

Ts

uOLINOM

AW

ANdNI

INIT

nee

a

wehbe

be

es

a

ayuVOS

LINDYID

7

[eal

dW

&d

cc

oO

<

a

x

°o

-

|

YRLIW

NIA

eee

£020

HY

2010

£010

nin

2)

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dNV

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-

1-2,

MAJOR

PARTS

LOCATIONS

Cabinet

—

Front

View

—

Y¥-20410-12-6S

counter,

tape

index

_

X-3

1440-08

3-144-042-10

cabinet

ass‘y,

wood

panel,

reel

3-140-864-01

3-140-864-01

reel

table

reel

table

1-514-692

switch,

lever;

MONITOR

(S302)

3-144-058

3-144-050-20

cover,

head

knob,

lever

switch;

REC

X-31408-07

x-

-3

1408-04

;

roller

ass’y,

guide

:

pinch

roller

ass’y

144-128

3-144-050-30

-

oe

tton

knob,

lever

switch;

rewind

1-514-769

(S305,

S306)

;

Spa

e

ee

er

3-144-050-40

knob,

lever

switch;

stop

3-144-050-10

knob,

lever

switch;

forward

3-144-050-30

knob,

lever

switch;

fast

forward

3-144-079

cover,

pushbutton

8B

1-514-789

switch,

slide;

TAPE

SPEED

(S301)

X-3

1440-09

knob

B

ass‘y,

PB

VOL

X-3

1440-09

knob

B

ass‘'y,

LINE

VOL

switch,

lever;

REC

MODE

1-507-28

1

(J301,

J302)

jack,

MICROPHONE

1-507-282

(J303)

jack,

binaural:

HEADPHONE

X-3

1440-11

knob

C

ass'y,

VOL

(ECHO/SOS)

1-514-324

(S303)

switch,

slide;

SOS

&

ECHO

X-31440-09

knob

B

ass'y,

MIC

VOL

1-513-347

switch,

slide;

TAPE

SELECT

(S307)

Cabinet

—

Back

View

—

3-456-002

grille,

ventilation

1-509-341

(CNJ402)

socket,

AC

OUTLET

171-509-064

1-507-142

(J304,

305)

socket,

voltage

jack,

phono:

LINE

INPUT

selector

(J403)

LINE

INPUT,

(for

General

Export}

171-509-029

(J308)

owen

SUPPLY

:

\

"

‘

connector,

REC/PB

171-509-062

(CNJ401)

seoune

4

!

~

:

(for

General

Export}

socket,

POWER

SUPPLY

®

5

\

i

:

f

1-507-142

(J306,

307}

jack,

phono;

LINE

OUTPUT

X-380

12-04

terminal

ass‘y,

GROUND

171-532-100

fuse,

2A

Chassis

—

Front

View

—

1-514-324-11

(S407)

switch,

slide;

50/60

Hz

(for

General

Export)

X-3

1428-30

brake

(R)

ass’y

3-144-037

be/t,

counter

X-3

1428-29

brake

(L}

ass‘y

3-144-033

pulley,

motor

1-454-080

(PM401)

solenoid,

pinch

roller

3-140-520

belt,

capstan

1-454-079

(PM402}

solenoid,

brake

1-524-077

meter,

VU

{(ME301,

302)

Chassis

—

Back

View

—

1-117-083

(C402)

capacitor,

metalized

paper

1-441-680

(T401)

transformer,

power

(for

USA)

1-441-694

(T401)

transformer,

power

(for

General

Export}

1-54

1-033-21

(M402)

motor,

reel

(CM-71)}

8-83

1-634-13

(M401)

motor,

capstan

(HC-634D5)

1-117-083

(C403)

capacitor,

metalized

paper

1-54

1-033-21

(M403)

motor,

reel

(CM-71)

SE

CTION

2

DISASSEMBLY

A@RK

4x25

O@RK

4x

15

Fig.

2-1.

Cabinet

Removal

Panel

SECTION

3

FREQUENCY

ADAPTATION

Remove

the

front

four

screws.

panel

by

loosening

the

Set

the

frequency

selector

for

the

line

fre-

quency

of

your

local

area.

Remove

the

motor

pulley

by

the

two

set

screws

and

reinsert

the

motor

pulley

upside

down,

then

tighten

the

screws

again.

cep

Remove

the

cabinet

by

removing

the

seven

screws

marked

with

A

in

Fig.

2-1.

Removal

Remove

the

panel

by

removing

the

four

screws

@RK

4

x

15)

marked

with

o

in

Fig.

2-1.

4.

Slightly

loosen

the

four

screws

which

tighten

the

capstan

motor

to

the

chassis.

Then,

slide

the

motor

as

illustrated

and

tighten

the

screws

again.

5.

Replace

the

rubber

belt

on

the

motor

pulley

so

that

the

belt

is

threaded

horizontally.

Try

to

turn

the

motor

pulley

several

times

to

see

whether

the

belt

is

threaded

securely.

6.

Replace

the

front

panel.

6OHz

50Hz

a

@(

je

cP

ee

Fig.

3-1.

Frequency

adaptation

es

SECTION

4

MAINTENANCE

4-1.

LUBRICATION

Use

light

machine

oil

and

lubricate

the

pinch

roller

shaft

and

capstan

drive

motor

lubricating

hole.

It

will

cause

slippage

of

the

mechanism.

If

the

oil

spills

on

the

pinch

roller

or

the

rubber

belt,

wipe

it

off

immediately

with

denatured

alcohol.

To

lubricate

them,

proceed

as

follows:

Avoid

excessive

lubrication.

(1)

Remove

the

head

cover

and

the

screw

securing

pinch

roller

and

then

lubricate

the

pinch

roller

shaft

with

one

drop

of

light

machine

oil.

(2)

Remove

the

reel

panel

and

lubricate

the

motor

lubricating

hole

with

several

drops

of

light

machine

oil.

Note:

Use

the

oil

which

is

comparatively

viscous

at

the

pinch

roller

shaft.

4-2.

CLEANING

Dusts

and

dirts

which

were

brought

by

tape

may

stick

to

the

core

of

the

record,

playback

or

erase

head,

and

they

may

deteriorate

the

perform-

ance

of

the

record

and

the

playback

heads.

So

wipe

off

the

surface

of

the

heads,

with

a

clean

and

soft

cloth

dampened

with

denatured

alcohol.

To

ensure

proper

operation,

the

heads

should

be

cleaned

at

least

once

during

each

ten

hours

of

actual

operation.

CAUTION

Do

not

use

any

other

‘solvent

on

the

head

as

some

will

damage

the

material

which

binds

the

head

laminations

together.

Also

do

not

use

any

metallic

device

which

will

scratch

the

head.

At

the

same

time,

clean

capstan,

rubber

belt,

pinch

roller,

tape

guide,

flutter

filter

roller

and

tension

arm.

4-3.

DEMAGNETIZING

The

record

and

playback

heads

may

occasionally

acquire

a

degree

of

permanent

magnetization,

which

will

result

in

an

increase

of

noise

level,

distortion

of

any

recorded

signal,

and

a

gradual

erasure

of

high

frequency

on

any

recorded

tape

which

passed

over

them.

These

heads

may

be

easily

demagnetized

with

a

SONY

head

demagnetizer

HE-2

(optional

accessory)

or

equivalent.

To

demagnetize

the

heads,

proceed

as

follows:

Steps:

(1)

Remove

the

head

cover.

(2)

Make

sure

that

power

switch

on

the

TC-640

is

in

the

OFF

position.

(3)

Connect

the

demagnetizer

to

ac

power

source.

(4)

Bring

the

tips

of

the

demagnetizer

in

close

proximity

to,

but

not

in

contact

with,

the

heads

so

that

the

tips

straddle

the

gap

in

the

center

of

the

head,

run

the

tips

up

and

down

the

heads

several

times,

and

then

slowly

with-

draw

the

demagnetizer.

CAUTION

Do

not

bring

magnet

close

to

heads.

5-1.

5-1-1.

SECTION

5

ADJUSTMENT

PROCEDURES

MECHANICAL

ADJUSTMENTS

171-117-083

(C402)

capacitor,

metalized

paper

171-117-083

(C403)

capacitor,

metalized

paper

1-541-033-21

(M403)

motor,

reel

(CM-71)

-

1-117-040

(C401)

capacitor,

metalized

paper

1-441-680

(T401)

transformer,

power

(for

USA)

1-441-694

(T4017)

transformer,

power

(for

General

Export)

1-541-033-21

(M402)

motor,

reel

(CM-71)

8-83

1-634-13

(M401)

motor,

capstan

(HC-634D5}

Adjusting

parts

locations

Automatic

Shut-off

Switch

Adjustment

Remove

the

head

deck

by

taking

off

the

two

screws,

and

put

it

upside

down

on

a

soft

cloth.

Make

sure

that

the

shut-off

lever

does

not

touch

the

head

deck

when

pushing

it

by

the

hand.

See

Fig.

5-1-1.

If

necessary,

adjust

the

position

of

the

actuator

bracket

by

loosening

the

screws

A.

Place

the

head

.

deck

See

Fig.

5-1-1.

in

a

normal

position.

Push

the

shut-off

lever

slowly

by

the

hand,

and

check

to

see

that

the

microswitch

turns

on

when

the

lever

comes

the

one-third

position

of

the

slot

as

shown

in

Fig.

5-1-2.

If

necessary,

adjust

the

position

of

the

micro-

switch

by

loosening

the

screws

(B)

and

(C).

Release

the

shut-off

lever,

and

make

sure

that

the

microswitch

turns

off

when

the

actuator

comes

at

one-fourth

position

of

the

slot

(See

Fig.

5-1-2).

Make

sure

that

the

shut-off

lever

reaches

the

top

of

the

slot

when

pushing

the

lever

by

the

hand.

9.

If

it

is

not,

readjust

the

position

of

the

actuator

bracket.

actuator

bracket

shut-off

lever

Fig.

5-1-1.

Automatic

shut-off

Switch

adjustment

(1)

shut-off

lever

ri

*]

one

_

U

%

ia

Fig.

5-1-2,

Automatic

shut-off

switch

adjustment

(2)

5-1-2.

Pinch

Roller

Pressure

Adjustment

1.

Place

the

unit

in

the

play

mode

to

energize

the

pinch

roller

solenoid,

and

turn

on

the

automatic

shut-off

switch.

Note:

Hold

the

shut-off

lever

so

that

the

shut-off

switch

is

activated

(a

rubber

band

or

a

piece

of

masking

tape

will

hold

the

shut-off

lever

as

though

tape

were

threaded

on

the

unit.)

2.

Adjust

the

adjusting

nut

(A)

for

1

mm

(3/64”

)

clearance

between

the

link

shaft

and

the

adjust-

ing

nut

(A).

See

Fig.

5-1-3.

:

3.

Attach

the

spring

scale

(5

kg)

to

the

pinch

roller

shaft

with

a

piece

of

string.

See

Fig.

5-1-4.

Pull

the

scale

horizontally

in

the

direction

shown

by

the

arrow.

The

capstan

shaft,

pinch

rolier

and

the

spring

scale

should

be

in

a

line.

Check

the

reading

just

when

the

pinch

roller

separates

from

the

capstan.

4,

Adjust

the

adjusting

nut

(B)

for

2.2

+

0.2

kg.

(4.4

to

5.3

1b)

5.

Repeat

steps

2

to

4

several

times.

6.

After

adjustment,

lock

the

adjusting

nut

(B)

by

the

lock

nut

(B).

7.

Adjust

the

adjusting

nut

(A)

for

the

clearance

of

0.1

to

0.2

mm

between

the

lock

nut

(A)

and

the

link

shaft.

8,

Lock

the

adjusting

nut

(A)

by

the

lock

nut

(A).

9,

Check

for

the

correct

value

again.

link

shaft

areal

lock

nut

(A)

adjusting

nut

(B)

adjusting

nut

(A)

Fig.

5-1-3.

Pinch

roller

pressure

adjustment

(1)

Pull

the

spring

scale

aA

in

the

direction

shown

by

the

arrow.

capstan

TS

pinch

roller

Fig.

5-1-4.

Pinch

roller

pressure

adjustment

(2)

5-1-3.

Microswitch

Position

Adjustment

1.

Check

to

see

that

the

microswitch

(for

pinch

roller

solenoid)

is

turned

on

when

the

pinch

roller

touches

the

capstan.

See

Fig.

5-1-5.

2. If

it

is

not,

adjust

the

position

of

the

micro-

switch

by

loosening

the

screws

A.

to

be

contact

capstan

pinch

roller

Fig.

5-1-5.

Microswitch

position

adjustment

5-1-4.

Reel

Motor

Torque

Adjustment

Take-up

Motor

Torque

Adjustment

1.

Place

the

reel

with

string

wound

several

turns

clockwise

on

the

hub

(44

mm

dia)

onto

the

take-up

reel

table.

Tie

the

string

to

the

spring

scale.

2.

Hold

the

shut-off

lever

so

that

the

shut-off

switch

is

activated

(a

rubber

band

or

a

piece

of

masking

tape

will

hold

the

shut-off

lever

as

though

tape

were

threaded

on

the

unit).

3.

Place

the

unit

in

the

play

mode.

Pull

the

spring

scale

and

then

allow

to

take

up

the

string

on

the

reel

while

approaching

the

scale

to

the

reel

at

the

same

speed

of

tape

running.

Adjust

RV401

for

330

to

350

g-cm

(4.58

to

4.86

oz.

inch)

on

the

spring

scale.

See

Fig.

5-1-6.

Note:

Read

the

scale

while

moving

it.

5-1-5,

Back

Tension

Torque

Adjustment

Place

the

empty

hub

with

string

wound

several

turns

counterclockwise

on

the

hub

(44

mm

dia)

onto

the

supply

reel

table.

Tie

the

string

to

the

spring

scale.

Hold

the

shut-off

lever

so

that

the

shut-off

switch

is

activated

(a

rubber

band

or

a

piece

of

masking

tape

will

hold

the

shut-off

lever

as

though

tape

were

threaded

on

the

unit.)

Place

the

unit

in

the

play

mode.

Pull

the

spring

scale

at

the

same

speed

of

tape

running.

Adjust

RV402

for

240

to

260

g-cm

(3.32

to

3.60

oz.

inch)

on

the

spring

scale.

See

Fig.

5-1-6.

Note:

Read

the

scale

while

pulling

it.

Fig.

5-1-6.

Reel

motor

torque

adjustment

Brake

Torque

Adjustment

This

adjustment

should

be

performed

for

both

supply

and

take-up

sides.

Note:

The

instructions

in

[

)

are

applied

to

the

’

supply

brake

torque

adjustment.

Place

the

unit

in

the

STOP

mode.

Bend

the

portion

A

_

of

the

brake

lever

with

a

pair

of

pliers

so

that

the

clearance

between

the

brake

lever

and

the

limiter

is

approx.

2

mm

(5/64").

Place

an

empty

reel

with

string

wound

several

turns

counterclockwise

[clockwise]

on

the

hub

onto

the

reel

table.

Tie

the

spring

to

a

spring

scale.

—~10—

4.

Pull

the

spring

scale

horizontally

at

a

constant

speed,

making

sure

that

the

string

does

not

touch

either

flange

of

the

reel.

The

reel

table

will

rotate

counterclockwise

[

clockwise

}.

Take

a

reading

only

when

the

reel

table

is

in

steady

motion.

5.

Make

sure

that

the

brake

torque

is

350

to

450

g.cm

(4.86

to

6.25

oz.

inch).

6.

Place

an

empty

reel

with

string

wound

several

turns

clockwise

[counterclockwise]

on

the

hub

onto

the

reel

table.

Tie

the

spring

to

a

spring

scale.

ti

Pull

the

scale

horizontally

at

constant

speed,

making

sure

that

-the

string

does

not

touch

either

flange

of

the

reel.

The

reel

table

will

rotate

clockwise

{

counterclockwise

].

Take

a

reading

only

when

the

reel

table

is

in

steady

motion.

8.

Make

sure

that

the

brake

torque

is

1,000

to

1,300

g-cm

(13.9

to

18.1

oz.

inch).

9.

If

it

is

not,

change

the

hooking

position

of

the

spring

for

the

specified

brake

torque.

10.

Check

to

see

that

the

center

pole

of

the

solenoid

should

be

pulled

out

from

the

solenoid

by

approx.

3

mm(1/8")

in

STOP

mode

as

shown

in

Fig.

5-1-9.

If

it

is

not,

adjust

the

position

of

the

brake

arm

bracket

A

marked

with

x.

11.

Make

sure

that

the

capstan

belt

does

not

rub

against

the

portion

marked

with

a

of

the

brake

lever

in

the

play

mode.

Specification:

Brake

Torque

of

Supply

Reel

in

clockwise

turning

..

350

-

450

g-cm

(4.86

-

6.25

oz.

inch)

in

counterclockwise

turning

.

1,000

-

1,300

g-cm

(13.9

-

18.1

oz.

inch)

Brake

Torque

of

Take-up

Reel

1,000

-

1,300

g-cm

(13.9

-

18.1

oz.

inch)

in

clockwise

turning

..

in

counterclockwise

turning

..

350-450

g-cm

(4.86

-

6.25

oz.

inch)