Sony TC-388-4 Manual de usuario

Power

Requirements:

Power

Consumption:

Tape

Speed:

Recording

Time:

Reels:

Recording

System:

Frequency

Response:

Distortion:

SPECIFICATIONS

120V

AC,

(USA

Model)

120V

AC,

(100,

110,

127,

220,

240

AC,

adjustable

the

Sony

personnel)

(PX

Model)

(USA

Model)

(PX

Model)

cm/s

(7/2

ips),

9.5

cm/s

(3%

ips)

min.

cm/s

ips)

quadraphonic

recording

with

1,800

tape

17.8

inches)

smaller

4-track

quadraphonic,

stereo

and

mono

system

With

Sony

SLH

tape

30,000

cm/s

(7/2

ips)

23,000

(+3

dB)

cm/s

(7/2

ips)

19,000

9.5

cm/s

(3%

ips)

With

standard

tape

25,000

cm/s

(7'/2

ips}

17,000

9.5

cm/s

(3%

ips)

1.2%

Wow

and

Flutter:

S/N

Ratio:

Inputs:

Outputs:

Dimentions:

Weight:

0.09

cm/s

ips)

0.12%

9.5

cm/s

(35/4

ips)

with

Sony

SLH

tape

Microphone

inputs

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

Sensitivity

0.2

(—72

dB)

low

impedance

microphones

Line

inputs

2.0...

eee

Sensitivity

0.06

(—22

dB)

Impedance

100

Line

OUTPUTS

..........

eee

Output

level

0.775

dB)

load

impedance

100

with

line

output

volume

control

set

MAX

Suitable

load

impedance

higher

than

10kQ2

Headphone

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

822

stereo

headphones

422

(w)

505

(h)

220

(d)

16°78

(w)

197

(h)

87/4

(d)

inches

14.5

(31

oz)

SERVICE

MANUAL

TC-388-4

TABLE

CONTENTS

Section

Title

Page

DPE

Cihicationst<s

seesaw

Oa,

eta

tat

OUTLINE

1-1.

PAN

POT

(Panoramic

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

1-2.

MUTING/PAUSE

Lever

....

2.20.00...

ee ee

1-3.

Block

Diagram

......

2...

1-4.

External

View

2...

le5.°.

Internal’

Views:

#08

Oa)

ple

DISASSEMBLY

¢.4-

sc6

0006

wee

ADJUSTMENTS

3-1.

Mechanical

Adjustments

....

2.2.2.2...

00000

eee

3-2.

Electrical

Adjustments...

2...

0...

DIAGRAMS

4-1.

Schematic

Diagram...

...

2...

0...

4-2.

Mounting

Diagrams.

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

0.2.00

eee

4-3...

Level.

Diagrams:

.30200cn

PACKING

AND

EXPLODED

VIEWS

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

ELECTRICAL

PARTS

LIST

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

HARDWARE!

ares

alg

eed

Geral

ere

TC-388-4

SECTION

OUTLINE

1-1.

PAN

POT

(Panoramic

Potentiometer)

With

PAN

POT

switch

turned

ON,

the

BACK

channels

are

mixed

into

the

FRONT

channels

reproduce

the

two-channel

stereo

sounds

and

PAN

POT

controls

can

shift

sound

image

reproduced

stereo

sound

field.

The

two

FRONT

channels

are

used

for

reproducing

astereo

sound

field

and

the

two

BACK

channels

for

reproducing

sound

image

and

shifting

it.

annn

——

REC/VOL

MIC

ioe

MAIN

VOL

C402

1-3.

BLOCK

DIAGRAM

“REC

FRONT

L-CH

—————————

J5-1

LINE

PAN

POT

ON,

—

REC

FRONT

R-CH

—~

*—_—

FEC

BACK

——+

MIC

10302

153

Q—---

IN?

FRONT

L-CH

——______.,

S2|

MONITOR

LEVEL

LINE

OUT

Val

1-2.

MUTING/PAUSE

LEVER

With

MUTING/PAUSE

lever

depressed

halfway,

the

tape

transport

not

pause

mode

but

the

record

signals

are

muted.

With

the

lever

farther

depressed

and

locked,

the

tape

transport

pause

mode.

With

the

lever

depressed

halfway,

turned

and

the

base

Q801

positive-biased,

Q801

turns

and

applies

B+

voltage

each

base

Q101,

Q201,

Q301

and

Q401

mute

each

channel

record

signal.

The

rise

time

muting

0.1

seconds,

which

determined

the

time

until

C802

charged

1.2

volts

through

R802.

With

the

lever

released,

turned

OFF

and

C802

discharges.

The

decay

time

muting

0.6

seconds,

which

determined

the

time

until

the

voltage

across

C802

decreases

into

1.2

volts.

RECORD

;

LEVEL

Osc

0701,

a702

0901.

TI{PT)

D902

$10

—_—

POWER

(C624H1

‘

HEADPHONE

J6-1

©)

LINE

OUT

Ref.

No.

Switch

Mode

MONITOR

TAPE

PAN

POT

OFF

MIC

ATT

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

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

SECTION

DISASSEMBLY

2-1.

AMP

PANEL

REMOVAL

Remove

four

screws

indicated

e@.

AB3x

2-2.

REEL

PANEL

REMOVAL

Remove

two

screws

indicated

and

remove

X-3536-201-0

head

cover.

Lever

Ass’y,

pause

MUTING/

PAUSE

knob

Remove

two

head

cover

supports.

1-514-697-00

[

head

cover

support]

Remove

MUTING/PAUSE

knob

turning

Switch,

leaf;

PAUSE

AB3x

counterclock

wise.

Sena

nNGIee

@RK3x6

@RK

Remove

five

screws

indicated

@RK

2-3.

CABINET

REMOVAL

Remove

eight

screws.

1-514-039-12

Switch,

micro;

motor

shut-off

(S11)

cabinet

PS4x

j; oo

©@&

sax

SECTION

ADJUSTMENTS

3-1.

MECHANICAL

ADJUSTMENTS

Tension

Arm

(A)

Adjustment

—

playback

mode

—

Perform

this

adjustment

after

turning

supply

reel

table

counterclockwise

hand.

supply

reel

table

Adjust

turning

the

screw.

—

tension

arm

tape

guide

(C)

tension

arm

(A)

locus

drawn

;

thepin

7.5

~8.5mm

pte

Movement

Che

re)

Note:

Ensure

that

the

tape

uniformly

comes

contact

with

the

tension

arm

the

beginning

and

end

the

tape.

(If

necessary,

adjust

bending

tension

arm

pin.)

tension

arm

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

—

‘to.be-flush

9.5

embs

(34a

ips)

m/s

some

clearance.

(7/2

ips)

capstan

idler

Adjust

the

height

the

jdler.by

loosening.

the

screw.

Note:

Perform

this

adjustment

for

both

vertical

and

horizontal

positions.

After

the

adjustment,

apply

locking

compound

the

screw.

Make

sure

that

capstan

idler

does

not

contact

motor

pulley

and

flywheel

stop

mode.

TC-388-4

Pause

Mechanism

Adjustment

—

playback

mode

—

With

pause

lever

pulled,

adjust

pause

adjusting

plate

position

loosening

screw

(A)

that

clearance

between

pinch

roller

and

capstan

0.5

(1/32).

Take-up

Torque

Adjustment

—

playback

mode

9.5

cm/s

(3%

ips)

tape

speed

—

Take-up

torque

decrease

MO"

increase

Pause

rod

plate

tension

arm

(A)

Pause

lever

Note:

When

pulling

pause

lever

stop

mode,

ensure

that

pause

lever

not

locked.

When

pulling

pause

lever

playback

mode,

ensure

that

brake

operates.

pause

adjusting

Spring

Scale

Note:

After

the

adjustment,

apply

locking

compound

the

screw.

Tension

Arm

(A)

Back-tension

Adjustment

Perform

this

adjustment

after

tension

arm

(A)

adjustment

(See

Page

9).

Use

a7’

reel

tape.

cee

playback

mode:

45~

58g

2°.

whe

LEO

LOL

OR)?

fast

forward

mode:

21g

0°

supply

reel

(0.53.

~0.71

02)

spring

beginning

;

Adjus

changing

tha-

tension

arm

hook

position-of

spring.

Note:

the

specified

back

tension

not

obtained

the

spring

hook

positioning,

perform

tension

arm

(A)

adjustment

(See

Page

9).

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

ree/

-to.be

flush

25.1

(1")

35mm.

(14s

os)

stop

mode

idler

F—

-Loosen-the

screws

and,

adjust

microswitch

bracket

position.

.°:.

necessary,

adjust

bending

idler

arm.

(S12)

‘Adjust

changing

the

washer

"$0

that

the

tape

does

not

come

’

in.contact

with

the

flange

microswitch

bracket

the

reel...

Note:

Ensure

the

following:

Bias

timing

switch

actuated

Washer

playback

mode.

When

changing

the

mode

from

record

stop

slowly,

REC

button

released

after

the

bias

timing

switch

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

(2.1

3.5

oz-

inch)

teats

1,300

1,700

direction

(18

oz:

inch)

supply

reel

direction

table

braking

torque

{

Yea")

Adjustable

for

direction

only.

Idler

Arm

Stroke

Check

—

playback

mode

9.5

cm/s

(3%

ips)

tape

speed

—

Fast

Forward

and

Rewind

Torque

Adjustments

—

rewind

and

fast

forward

mode

—

Adjust

positioning

fast

forward

idler

limiter

Spring

0%.

supply

reel

table

0.3

~0.5

Yan")

Adjust

bending.

Adj

ust

changing

‘hooking

position:

spring.

Note:

The

torque

should

measured

just

when

driving

idler

stops

rotating.

—11-

2249

Brake

Adjustment

(take-up

reel

table)

Brake

Shoe

Adjustment

—

rewind

mode

—

take-up

reel

table

‘Adjust

turning

‘this.

screw.

Brake

Torque

Adjustment

—

stop

mode

—

350

450

(4.9

6.2

oz:

inch)

1,300

1,700

(18

oz:

inch)

direction

take-up

ree!

table

braking

torque

direction

brake

lever

(A)

Adjust

by.

bending

this

portion.

take-up

reel

table

strong

“strong.

L-

(Cut

one

turn

of.

“the

spring

off.)

ldirection

lever

weak

oo"

“(Bend

the

tab:

TC-388-4

Pinch

Roller

Stroke

Adjustment

Remove

head

deck

removing

four

screws

indicated

Aon

Page

41.

—

stop

mode

—

screw

and

adjust

faint:

lever

Position.

Fix

the:

screw

While

pushing

“joint

lever

shown

by.

arrow.

retractive

lever

Joint

lever

washer

pinch

roller

shaft

3~4mm

(Ys

432")

retractive

lever

head

deck

—

bottom

view

—

Note:

Put

dummy

capstan

into

capstan

bearing

and

ensure

that

pinch

roller

shaft

moves

3~4

mm(4

32”)

the

retractive

lever

when

changing

the

mode

from

stop

playback.

Ensure

that

washer

pinch

roller

shaft

does

not

contact

the

part

indicated

when

changing

the

mode

from

playback

fast

forward

slowly.

Apply

locking

compound

the

screw,

Dummy

Capstan

(capstan

shaft)

Prepare

flywheel

ass’y

(X-3472-003-0)

and

remove

capstan

shaft

from

patting

the

head

the

capstan

shaft

with

the

hammer,

taking

care

not

bend

the

shaft.

Bottom

view

head

deck

~13-—

TC-388-4

Pinch

Roller

Pressure

Check

Put

dummy

capstan

into

capstan

bearing

and

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

measured

just

when

the

pinch

roller

releases

from

capstan.

Dummy

capstan

(capstan

shaft)

Prepare

flywheel

ass’y

(X-3472-003-0)

and

remove

capstan

shaft

from

patting

the

head

the

capstan

shaft

with

the

hammer,

taking

care

not

bend

the

shaft.

Shut-off

Mechanism

Adjustment

—

stop

mode

—

head

deck

(bottom

view)

shut-off

lever

(H)

Fath

433"

With:

shut-off

niaehaniarn:

shut-off

lever

bracket

shut-off

mechanism

release

Note:

After

the

adjustment,

apply

locking

compound

the

screws.

—~14—

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