Sony TC-388-4 User manual

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Power

Requirements:

Power

Consumption:

Tape

Speed:

Recording

Time:

Reels:

Recording

System:

Frequency

Response:

Distortion:

SPECIFICATIONS

120V

AC,

60

Hz

(USA

Model)

120V

AC,

60

Hz

(100,

110,

127,

220,

240

V

AC,

50

Hz

adjustable

by

the

Sony

personnel)

(PX

Model)

40

W

(USA

Model)

32

W

(PX

Model)

19

cm/s

(7/2

ips),

9.5

cm/s

(3%

ips)

45

min.

at

19

cm/s

(7

ips)

quadraphonic

recording

with

1,800

ft

tape

17.8

cm

(7

inches)

or

smaller

4-track

quadraphonic,

stereo

and

mono

system

With

Sony

SLH

tape

20

~

30,000

Hz

at

19

cm/s

(7/2

ips)

20

~

23,000

Hz

(+3

dB)

at

19

cm/s

(7/2

ips)

30

~

19,000

Hz

at

9.5

cm/s

(3%

ips)

With

standard

tape

20

~

25,000

Hz

at

19

cm/s

(7'/2

ips}

30

~

17,000

Hz

at

9.5

cm/s

(3%

ips)

1.2%

Wow

and

Flutter:

S/N

Ratio:

Inputs:

Outputs:

Dimentions:

Weight:

0.09

%

at

19

cm/s

(7

ips)

0.12%

at

9.5

cm/s

(35/4

ips)

55

dB

with

Sony

SLH

tape

Microphone

inputs

...........:

4

Sensitivity

0.2

mV

(—72

dB)

Accept

low

impedance

microphones

Line

inputs

2.0...

eee

40

Sensitivity

0.06

V

(—22

dB)

Impedance

100

kQ

Line

OUTPUTS

..........

eee

4

Output

level

0.775

V

(0

dB)

at

load

impedance

100

KQ

with

line

output

volume

control

set

to

MAX

Suitable

load

impedance

higher

than

10kQ2

Headphone

outputs...........

2

Accept

an

822

stereo

headphones

422

(w)

x

505

(h)

x

220

(d)

mm

16°78

(w)

x

197

(h)

x

87/4

(d)

inches

14.5

kg

(31

Ib

14

oz)

SERVICE

MANUAL

TC-388-4

|

TABLE

OF

CONTENTS

Section

Title

Page

DPE

Cihicationst<s

we

Be

seesaw

2s

Oa,

eR

eh

oe

eta

ee

tat

Il

7.

OUTLINE

1-1.

PAN

POT

(Panoramic

Potentiometer).................

3

1-2.

MUTING/PAUSE

Lever

....

2.20.00...

2

ee

ee ee

ee

3

1-3.

Block

Diagram

......

2...

2...

ee

3

1-4.

External

View

.

2...

2.

2

ee

4

le5.°.

Internal’

Views:

#08

3:

a

ke

Oa)

AS

ee

hs

ple

ee

ee

ed

4

2.

DISASSEMBLY

¢.4-

sc6

0006

wee

ee

ee

ee

a

ee

Se

8

3.

ADJUSTMENTS

3-1.

Mechanical

Adjustments

....

2.2.2.2...

00000

eee

eee

9

3-2.

Electrical

Adjustments...

2...

0...

ee

15

4.

DIAGRAMS

4-1.

Schematic

Diagram...

...

2...

2...

0...

ee

ee

24

4-2.

Mounting

Diagrams.

...........0

0.2.00

2

eee

eee

eee

27

4-3...

Level.

Diagrams:

3.

.30200cn

ee

A

a

a

ee

PS

33

5.

PACKING

AND

EXPLODED

VIEWS

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

34

6.

ELECTRICAL

PARTS

LIST

............-2....0-02004.

45

7.

HARDWARE!

:.

5:

ares

alg

ae

be

eed

hk

ee

Geral

&

Db

ek

ere

50

TC-388-4

SECTION

1

OUTLINE

1-1.

PAN

POT

(Panoramic

Potentiometer)

With

PAN

POT

switch

turned

ON,

the

BACK

channels

are

mixed

into

the

FRONT

channels

to

reproduce

the

two-channel

stereo

sounds

and

PAN

POT

controls

can

shift

a

sound

image

on

a

reproduced

stereo

sound

field.

The

two

FRONT

channels

are

used

for

reproducing

astereo

sound

field

and

the

two

BACK

channels

for

reproducing

a

sound

image

and

shifting

it.

r-

FL

EK

annn

——

REC/VOL

MIC

ioe

MAIN

VOL

C402

1-3.

BLOCK

DIAGRAM

“REC

FRONT

L-CH

—————————

J5-1

LINE

IN

PAN

POT

SW

ON,

S3

—

REC

FRONT

R-CH

—~

*—_—

FEC

BACK

CH

——+

|S

af

MIC

10302

153

Q—---

NE

IN?

7

PB

FRONT

L-CH

——______.,

S2|

MONITOR

PB

LEVEL

LINE

OUT

Val

1-2.

MUTING/PAUSE

LEVER

With

MUTING/PAUSE

lever

depressed

halfway,

the

tape

transport

is

not

in

pause

mode

but

the

record

signals

are

muted.

With

the

lever

farther

depressed

and

locked,

the

tape

transport

is

in

pause

mode.

With

the

lever

depressed

halfway,

S8

is

turned

ON

and

the

base

of

Q801

is

positive-biased,

Q801

turns

ON

and

applies

B+

voltage

to

each

base

of

Q101,

Q201,

Q301

and

Q401

to

mute

each

channel

record

signal.

The

rise

time

of

muting

is

0.1

seconds,

which

is

determined

by

the

time

until

C802

is

charged

up

to

1.2

volts

through

R802.

With

the

lever

released,

S8

is

turned

OFF

and

C802

discharges.

The

decay

time

of

muting

is

0.6

seconds,

which

is

determined

by

the

time

until

the

voltage

across

C802

decreases

into

1.2

volts.

RECORD

;

LEVEL

L

=

RH

Osc

§

5

0701,

a702

~~

EH

0901.

TI{PT)

D902

$10

—_—

POWER

2

oS

AC

IN

|

ss

|

l

re

|

(C624H1

Oo

oA

‘

.

HEADPHONE

J6-1

©)

LINE

OUT

Ref.

No.

Switch

Mode

$2

MONITOR

TAPE

83

PAN

POT

OFF

S4

MIC

ATT

0

dB

$8

PAUSE

MUTING

OFF

TC-388-4

1-4.

EXTERNAL

VIEW

3-472-264-00

3-536-258-00

Knob,

TAPE

SPEED

Support,

head

cover

1-578-152-47

Lamp,

pause

muting

(PL10)

X-3536-208-2

3-472-263-00

Knob

Ass’y,

FF/FWD/REW

Knob,

MUTING/PAUSE

X-3518-012-0

X-3536-209-2

Cover

Ass’y,

head

Button

Ass’y,

REC

1-514-817-41

(PX

Model)

1-516-023-11

(USA

Model}

1-514-448-00

Switch,

slide;

HEADPHONE

(S5)

Switch,

slide;

POWER

(S10)

1-516-447-00

1-516-024-00

Switch,

lever

slide;

TAPE

——_

Switch,

slide;

PAN

POT

{S3)}

SELECT

($7)

Eadingts

aa

1-516-446-00

WELEO

WeVeT

NOE)

Switch,

lever:

MONITOR

(S2)

FRONT

MIC

ATT

(S4)

1-5.

INTERNAL

VIEWS

1-506-3

12-00

Connector,

joint

terminal

(CNP1}

1-507-323-00

Connector,

joint

terminal

(CNJ1}

X-3536-216-1

Complete

Circuit

Board,

X-3536-220-1

TAPE

SPEED

switch

Complete

Circuit

Board,

power

supply

Integrated

Circuit,

BX-252

{C901}

X-3536-222-1

Complete

Circuit

Board,

bias

osc

TC-388-4

X-3536-218-1

X-3536-214-1

Complete

Circuit

Board,

MIC

jack

Complete

Circuit

Board,

MONITOR

X-3536-217-1

Complete

Circuit

Board,

PAN

POT

switch

X-3536-215-1

Complete

Circuit

Board,

pan

pot

X-3536-227-1

Complete

Circuit

Board,

REC

MODE

X-3536-226-1

Complete

Circuit

Board,

:

front

record

X-3536-225-1

Complete

Circuit

Board,

back

record

X-3536-223-1

:

X-3536-224-1

Complete

Circuit

Board,

front

playback

Complete

Circuit

Board,

back

playback

3-518-069-00

Belt,

motor

pulley

3-472-332-00

Beit,

take-up

1-520-1

79-00

Meter,

level

(ME1

~4)

'C-388-4

8-825-527-00

8-824-729-40

8-829-342-40

Head,

erase

Head,

record

Head,

playback

EF137-2904H

RP138-2904

PP138-4204

TC-388-4

TC-388-4

|

SECTION

2

DISASSEMBLY

2-1.

AMP

PANEL

REMOVAL

Remove

four

screws

indicated

by

e@.

AB3x

16

AB3x

1h

2-2.

REEL

PANEL

REMOVAL

1)

Remove

two

screws

indicated

by

*

and

remove

X-3536-201-0

head

cover.

Lever

Ass’y,

pause

MUTING/

PAUSE

knob

2)

Remove

two

head

cover

supports.

1-514-697-00

[

head

cover

support]

ta

7

3)

Remove

MUTING/PAUSE

knob

by

turning

it

Switch,

leaf;

PAUSE

AB3x

12

:

AB3x

12

counterclock

wise.

MU

:

:

Sena

nNGIee

@RK3x6

@RK

3x

12

4)

Remove

five

screws

indicated

by

4.

@RK

3x

12

@

RK

3x

12

2-3.

CABINET

REMOVAL

Remove

eight

screws.

1-514-039-12

Switch,

micro;

motor

shut-off

(S11)

cabinet

PS4x

14

|

Ps

j; oo

©@&

sax

14

SECTION

3

ADJUSTMENTS

3-1.

MECHANICAL

ADJUSTMENTS

Tension

Arm

(A)

Adjustment

—

playback

mode

—

Perform

this

adjustment

after

turning

supply

reel

table

counterclockwise

by

hand.

supply

reel

table

Adjust

by

turning

the

screw.

—

tension

arm

pin

tape

guide

(C)

tension

arm

(A)

locus

drawn

:

;

be

se

by

thepin

7.5

~8.5mm

pte

Movement

Che

re)

Note:

Ensure

that

the

tape

uniformly

comes

in

contact

with

the

tension

arm

pin

at

the

beginning

and

end

of

the

tape.

(If

necessary,

adjust

by

bending

tension

arm

pin.)

tension

arm

pin

tape

tension

arm

(A)

TC-388-4

Capstan

Idler

Adjustment

Perform

this

adjustment

after

motor

pulley

height

check

(See

Page

12).

—

playback

mode

—

motor

pulley

—

es

BE

‘to.be-flush

9.5

embs

(34a

ips)

m/s

1

To

be

some

clearance.

(7/2

ips)

capstan

idler

Adjust

the

height

of

the

jdler.by

loosening.

the

screw.

ca

Note:

1.

Perform

this

adjustment

for

both

vertical

and

horizontal

positions.

2.

After

the

adjustment,

apply

locking

compound

to

the

screw.

3.

Make

sure

that

capstan

idler

does

not

contact

motor

pulley

and

flywheel

in

stop

mode.

TC-388-4

Pause

Mechanism

Adjustment

—

playback

mode

—

@)

With

pause

lever

pulled,

adjust

pause

adjusting

plate

position

by

loosening

screw

(A)

so

that

clearance

between

pinch

roller

and

capstan

is

0.5

~

1

mm

(1/32).

Take-up

Torque

Adjustment

—

playback

mode

at

9.5

cm/s

(3%

ips)

tape

speed

—

Take-up

torque

decrease

MO"

increase

S

Pause

rod

plate

tension

arm

(A)

Pause

lever

Note:

1.

When

pulling

pause

lever

in

stop

mode,

ensure

that

pause

lever

is

not

locked.

2.

When

pulling

pause

lever

in

playback

mode,

ensure

that

brake

operates.

pause

adjusting

Spring

Scale

Note:

After

the

adjustment,

apply

locking

compound

to

the

screw.

Tension

Arm

(A)

Back-tension

Adjustment

Perform

this

adjustment

after

tension

arm

(A)

adjustment

(See

Page

9).

:

Use

a7’

reel

tape.

ae

:

cee

ie

-

playback

mode:

45~

58g

2°.

whe

OS

LEO

LOL

OR)?

fast

forward

mode:

18

~

21g

0°

supply

reel

©

(0.53.

~0.71

02)

spring

beginning

;

Adjus

t

by

changing

tha-

tension

arm

pin

hook

position-of

spring.

Note:

lf

the

specified

back

tension

is

not

obtained

by

the

spring

hook

positioning,

perform

tension

arm

(A)

adjustment

(See

Page

9).

2A

=

TC-388-4

T1C-388-4

Fast

Forward

Pulley

and

Driving

idler

Adjustment

—

stop

mode

—

Reel

Table

Height

Adjustment

—

playback,

rewind

and

fast

forward

mode

—

Bias

Timing

Switch

(S12)

Position

Adjustment

supply

reel

table

fast

forward

pulley

driving

idler

take-up

hs

C2

ree/

-to.be

flush

25.1

mm

(1")

35mm.

(14s

os)

stop

mode

idler

am

F—

-Loosen-the

screws

and,

adjust

microswitch

|

=

bracket

position.

.°:.

If

necessary,

adjust

by

bending

idler

arm.

(S12)

‘Adjust

by

changing

the

washer

"$0

that

the

tape

does

not

come

|

’

in.contact

with

the

flange

of

microswitch

bracket

the

reel...

Note:

Ensure

the

following:

1.

Bias

timing

switch

is

actuated

in

Washer

playback

mode.

2.

When

changing

the

mode

from

record

to

stop

slowly,

REC

button

is

released

after

the

bias

timing

switch

is

released.

Part

No.

3-701-443-01

Thickness

(mm)

0.13

0.25

0.50

3-701-443-11

3-701-44

3-21

Motor

Pulley

Height

Check

Note:

After

the

adjustment,

perform

back

tension

and

take-up

torque

adjustments.

(See

Page

10).

motor

pulley

Brake

Torque

Adjustment

(supply

reel

table)

—

stop

mode

—

750

~

250

9-

cm

(2.1

~

3.5

oz-

inch)

teats

1,300

~

1,700

g-

cm

direction

D

|

(18

~

24

oz:

inch)

supply

reel

direction

C

table

braking

torque

7

mm

{

Yea")

Adjustable

for

direction

D

only.

Idler

Arm

Stroke

Check

—

playback

mode

at

9.5

cm/s

(3%

ips)

tape

speed

—

Fast

Forward

and

Rewind

Torque

Adjustments

—

rewind

and

fast

forward

mode

—

Adjust

by

positioning

fast

forward

idler

limiter

Spring

0%.

O

supply

reel

table

0.3

~0.5

mm

Yan")

Adjust

by

bending.

Adj

ust

by

changing

‘hooking

position:

-

Of

spring.

Note:

The

torque

should

be

measured

just

when

driving

idler

stops

rotating.

—11-

2249

=

Brake

Adjustment

(take-up

reel

table)

1.

Brake

Shoe

Adjustment

—

rewind

mode

—

take-up

reel

table

‘Adjust

by

turning

‘this.

screw.

2.

Brake

Torque

Adjustment

—

stop

mode

—

350

~

450

g-

cm

(4.9

~

6.2

oz:

inch)

1,300

~

1,700

g-

cm

(18

~

24

oz:

inch)

direction

B

take-up

ree!

table

braking

torque

direction

A

brake

lever

(A)

Adjust

by.

bending

this

portion.

take-up

reel

table

strong

“strong.

L-

(Cut

one

turn

of.

|

“the

spring

off.)

ldirection

A}

lever

weak

oo"

“(Bend

the

tab:

TC-388-4

Pinch

Roller

Stroke

Adjustment

Remove

head

deck

by

removing

four

screws

indicated

by

Aon

Page

41.

—

stop

mode

—

eo

he

screw

and

adjust

faint:

lever

Position.

er

Fix

the:

screw

While

pushing

©

<

“joint

lever

as

shown

by.

arrow.

:

retractive

lever

Joint

lever

washer

fs

pinch

roller

shaft

1

at

3~4mm

(Ys

~

432")

retractive

lever

head

deck

—

bottom

view

—

Note:

1.

Put

dummy

capstan

*

into

capstan

bearing

and

ensure

that

pinch

roller

shaft

moves

by

3~4

mm(4

~

32”)

on

the

retractive

lever

when

changing

the

mode

from

stop

to

playback.

2.

Ensure

that

washer

of

pinch

roller

shaft

does

not

contact

the

part

indicated

by

*

when

changing

the

mode

from

playback

to

fast

forward

slowly.

3.

Apply

locking

compound

to

the

screw,

*

Dummy

Capstan

(capstan

shaft)

Prepare

a

flywheel

ass’y

(X-3472-003-0)

and

remove

capstan

shaft

from

it

by

patting

the

head

of

the

capstan

shaft

with

the

hammer,

taking

care

not

to

bend

the

shaft.

Bottom

view

of

head

deck

~13-—

TC-388-4

Pinch

Roller

Pressure

Check

1.

Put

dummy

capstan

>

into

capstan

bearing

and

2.

Measure

the

pressure.

ensure

the

following.

—

playback

mode

—

—

playback

mode

—

pinch

roller

lever

(B)

Pinch

roller

dummy

capstan

pinch

roller

lever

(A)

head

deck

—

bottom

view

—

retractive

lever

Note:

The

pressure

should

be

measured

just

when

the

pinch

roller

releases

from

capstan.

%

Dummy

capstan

(capstan

shaft)

Prepare

a

flywheel

ass’y

(X-3472-003-0)

and

remove

capstan

shaft

from

it

by

patting

the

head

of

the

capstan

shaft

with

the

hammer,

taking

care

not

to

bend

the

shaft.

Shut-off

Mechanism

Adjustment

—

stop

mode

—

head

deck

(bottom

view)

shut-off

lever

(H)

©

Fath

mm

433"

ye

ae

With:

shut-off

niaehaniarn:

shut-off

lever

bracket

shut-off

mechanism

release

Note:

After

the

adjustment,

apply

locking

compound

to

the

screws.

—~14—