Sony TC-K370 User manual

TC-K370/RX370

SERVICE

MANUAL

AEP

Model

Australian

Model

TC-K370

Model

Canadian

Model

AEP

Model

TC-RX370

Photo:

TC-K370

Dolby

noise

reduction

and

Pro

headroom

extension

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

Pro

originated

Bang

Olufsen.

“DOLBY”,

the

double-D

symbol

and

“HX

PRO”

are

trademarks

Dolby

Laboratories

Licensing

Corporation.

Model

Name

Using

TC-W370/W41

Similar

Mechanism

/WR511/WR570

TC-K370

TCM-190VB12C

TC-RX370

TCM-190RB12C

SPECIFICATIONS

Tape

Transport

Mechanism

Type

4-track

2-channel

stereo

Approx.

sec.

(with

Sony

C-60

Recording

system

Fast-winding

time

Outputs

Line

outputs

Rated

output

level]

0.32

ata

load

cassette)

(phono

jacks)

impedance

Bias

bias

ohms

Motors

Capstan

motor

(DC

motor)

Load

impedance

Over

ohms

Headphones

0.3

load

(stereo

phone

impedance

jack)

ohms

Reel

motor

(DC

motor)

Signal-to-noise

ratio

(at

peak

level)

Dolby

switch

OFF

B-Type

C-Type

Cassette

Output

level

General

Type

(Sony

HF-S)

Type

(Sony

METAL-SLT)

58dB

66dB

73dB

Type

(Sony

UX-S)

57dB

65dB

oae

7008.

Total

harmonic

distortion

(with

Sony

METAL-SLT

cassette)

Frequency

response

(DOLBY

OFF)

Type

cassette

(Sony

METAL-SLT)

(Sony

HF-S)

Wow

and

flutter

Inputs

recording]

Type

cassette

15,000

(+3

dB,

IEC)

(Sony

UX-S)

Type

cassette

14,000

(+3

dB,

IEC)

15,000

(+3

dB,

IEC)

13,000

[+3

dB,

OVU

(-4

dB)

socal

40.13%

Peak

(IEC)

0.07%

WRMS

(NAB)

+0.18%

Peak

(DIN)

Line

inputs

(phono

jacks)

77.5

input

impedance

ohms

Sensitivity

Power

requirements

Power

consumption

Dimensions

Weight

US,

Canadian

model

:120V

AC,

60Hz

AEP,

Germany,

Australian

model:

220-230V

AC,

(or

240V

adjustable

Sony

personnel)

/60Hz

model

:240V

‘AC,

(or

220V

adjustable

Sony

personnel)

50/60Hz

Approx.

430

123

287

(w/h/d)

(17

113%

inches)

including

projecting

parts

and

controls

Approx.

3.9

Ibs

02)

Supplied

accessory

Audio

connecting

cords

(2)

Design

and

specifications

subject

change

without

notice.

STEREO

CASSETTE

DECK

ONY.

TC-

K370/RX370

SAFETY

CHECK-OUT

After

correcting

the

original

service

problem,

perform

the

following

safety

check

before

releasing

the

set

the

customer:

Check

the

antenna

terminals,

metal

trim,

‘“‘metallized”’

knobs,

screws,

and

all

other

exposed

metal

parts

for

leakage.

Check

leakage

described

below.

LEAKAGE

TEST

The

leakage

from

any

exposed

metal

part

earth

ground

and

from

all

exposed

metal

parts

any

exposed

metal

part

having

return

chassis,

must

not

exceed

0.5

(500

microampers).

Leakage

current

can

measured

any

one

three

methods.

commercial

leakage

tester,

such

the

Simpson

229

RCA

WT-S540A.

the

manufacturers’

instructions

use

these

instru-

ments.

battery-operated

milliammeter.

The

Data

Precision

245

digital

multimeter

suitable

for

this

job.

Measuring

the

voltage

drop

across

resistor

means

VOM

battery-operated

volt-

meter.

The

“limit”?

indication

0.75

analog

meters

must

have

accurate

low-

voltage

scale.

The

Simpson

250

and

Sanwa

SH-63Trd

are

examples

passive

VOM

that

suitable.

Nearly

all

battery

operated

digital

multimeters

that

have

range

are

suitable.

(See

Fig.

Exposed

Metal

Parts

Set

vo/tmeter

(0.75

Earth

Ground

Fig.

Using

voltmeter

check

leakage.

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

MARK

DOTTED

LINE

WITH

MARK

THE

SCHEMATIC

DIAGRAMS

AND

THE

PARTS

LIST

ARE

CRITICAL

SAFE

OPERATION.

REPLACE

THESE

COMPONENTS

WITH

SONY

PARTS

WHOSE

PART

NUMBERS

APPEAR

SHOWN

THIS

MANUAL

SUPPLEMENTS

PUB-

LISHED

SONY.

TABLE

CONTENTS

Sectton

Title

SECTION

GENERAL:

«sss

ttt

eee

SECTION:

DISASSENBEY@

2°

eee

sce

Bis

SECTION

ADJUSTMENTS:

eee

SECTION

DIAGRAMS

4-1].

Circuit

Boards

Locations

"s+

4-2.

Semiconductor

Lead

Layouts

-**«*°

4-3,

Printed

Wiring

Boards:

«++

ees

4-4,

Schematic

Diagrams

«=

sss

SECTION

EXPLODED

VIEWS

5-1.

Chassis

Sections

* *

5-2.

Front

Panel

Section:

«*

sss

5-3.

Mechanism

Section-l*

sss

5-4.

Mechanism

Section-2*

"85

SECTION

ELECTRICAL

PARTS

LIST:

»-

+--+

«+55

MODEL

IDENTIFICATION

(Specification

Label)

TC-K370

TC-RX370

SONY:

STEREO

CASSETTE

DECK

LLL

MODEL

NO,

US,

Canadian

model:

ACI20V

60Hz

20W

UK,

Australian

model:

AC240V

~50/60Hz

Germany,

AEP

model:

AC220-230V

50/60Hz

ATTENTION

COMPOSANT

AYANT

RAPPORT

SECURITE!

LES

COMPOSANTS

IDENTIFIES

PAR

UNE

MARQUE

SUR

LES

DIAGRAMMES

SCHEMATIQUES

LISTE

DES

PIECES

SONT

CRITIQUES

POUR

SECURITE

FONCTIONNEMENT.

REMPLACER

CES

COM.

POSANTS

QUE

PAR

DES

PIECES

SONY

DONT

LES

NUMEROS

SONT

DONNES

DANS

MANUEL

DANS

LES

SUPPLEMENTS

PUBLIES

PAR

SONY.

TC-K370/RX370

SECTION

GENERAL

TC-K370

“Remote

control

sensor

Capteur

télécommande

]

For

details,

refer

the

page

number

indicated

in@

{1}

POWER

switch

(rightward

fast

winding)

button

¥t

PAUSE

button

{2}

Cassette

holder

REC

MUTE

(record

muting)

button

REC

(recording)

button

{81

TAPE

COUNTER

sont

iu:

EJECT

button

14)

RESET

button

Ones

HEADPHONES

jack

(stereo

phone

jack)

(5)

PEAK

LEVEL

METER

*Remote

control

sensor

REC

(recording)

LEVEL

control

@®

You

can

remotely

control

this

cassette

deck

with:

—

remote

commander

that

came

with

Sony

amplifier

(7:

BALANCE

control

receiver

has

the

mark

and

cassette

deck

control

capability.

(8!

BIAS

control

—

optional

Sony

remote

commander

with

the

mark

'§}

DOLBY

(noise

reduction

switch)

and

cassette

deck

control

capability.

(10

Tape

operation

buttons

(Jeftward

fast

winding)

button

(stop)

button

(play)

button

TC-RX370

“Remote

control

sensor

Capteur

télécommande

For

details,

refer

the

page

number

indicated

POWER

switch

REC

MUTE

(record

muting)

button

REC

(recording)

button

(2)

Cassette

holder

(14;

EJECT

button

[3]

TAPE

COUNTER

A ‘

(19

HEADPHONES

jack

(stereo

phone

jack)

(4]

RESET

button

DIRECTION

mode

switch

{5}

PEAK

EVER

METER

*Remote

control

sensor

[6]

REC

(recording)

LEVEL

control

You

can

remotely

control

this

cassette

deck

with:

—

remote

commander

that

came

with

Sony

amplifier

[7]

BALANCE

control

receiver

if it

has

the

mark

and

cassette

deck

contro!

capability.

[8]

BIAS

control

—

optional

Sony

remote

commander

with

the

mark

. .

and

cassette

deck

control

capability.

[9]

DOLBY

(noise

reduction)

switch

[1G

Tape

operation

buttons

«44

(leftward

fast

winding)

button

™@

(stop)

button

~w@

(reverse

play)

button

(play)

button

(rightward

fast

winding)

button

PAUSE

button

This

section

extracted

from

instruction

manual.

TC-K370/RX370

SECTION

DISASSEMBLY

Note:

the

disassembly

procedure

the

numerical

order

given.

CASE

Unscrew

the

four

case

attachment

screws

and

remove

the

case.

CN805

@Femove

the

connectors.

FRONT

PANEL

MECHANISM

DECK

@Press

the

eject

button.

@Pull

the

counter

belt

and

put

arround

the

claw.

SS——

@BVTP2.6x8

mechanism

deck

Ocassette

lid

Remove

the

cassette

holder

assembly.

HEAD

(TC-K370)

screw

(BVTT2

10)

(y-

screw(azimuth

adjustment)

@REC/PB

head

HRP107

lever

(pinch

lever

FWD)

assy

FITTING

BASE

BLOCK

Oscrews

(PTPWH2

X23)

Cee

installing,

pull

the

capstan

belt

and

)

put

around

the

claws

shown

below.

TC-K370/RX370

(TC-RX370)

claw

@head

base

ass’y

HRP102,

HE102

lever

torsion

spring

lever(pinch

lever

FWDjass‘y

Oconnectors

Oscrews(P2.6

2.8)

(When

installing,

pull

the

belt

and

put)

around

the

claws

shown

below.

TC-K370/RX370

SECTION

ADJUSTMENTS

3-1.

MECHANICAL

ADJUSTMENTS

PRECAUTION

Clean

the

following

parts

with

denatured

alcohol-

moistened

swab:

record/playback/erase

head

(TC-RX370)

capstan

idlers

Demagnetize

the

record/playback

head

with

head

demagnetizer.

(Head

demagnetizer

not

approach

for

the

erase

head.)

not

use

magnetized

screwdriver

for

the

adjustment.

After

the

adjustments,

apply

suitable

locking

compound

the

parts

adjusted.

The

adjustments

should

perfomed

with

the

rated

power

supply

voltage

unless

otherwise

noted.

Torque

Measurement

Torque

meter

Meter

reading

65g

Forward

Q-102C

(0.

0.9

inch)

DECK

6g-

Forward

CQ-102C

(0.014

0.08

inch)

back

tension

DECK

9g*cm

(0.03

0.12

02°

inch)

Reverse

65g

Q-l02RC

(TC-RX370)

(0.42

0.9

inch)

Reverse

6g-cm

back

tension

Q-102RC

(0.014

0.08

inch)

(TC-RX370)

Sane

ieee

120g

FF,

REW

CQ-201B

(0.

1.87

inch)

3-2.

ELECTRICAL

ADJUSTMENTS

PRECAUTION

The

adjustment

should

performed

the

publication.

(Be

sure

make

playback

adjustment

first.)

The

adjustment

and

measurement

should

performed

for

both

L-CH

and

R-CH.

Switch

position

DOLBY

switch

OFF

DIR

MODE

switch

Standard

record

position

Deliver

the

standard

input

signal

level

input

jack

and

set

the

REC

LEVEL

control

obtain

the

standard

output

signal

level

follows,

—Record

Mode—

OSC

LINE

OUT

pinch

roller

record/playback(TC-K370)

erase

head(TC-K370)

rubber

belts

Standard

Input

Level

Input

terminal

LINE

source

impedance

10kQ

input

signal

level

0.25V

(—10dB)

Standard

Output

Level

Output

terminal

LINE

OUT

load

impedance

47kQ

output

signal

level

0.44V

(—5dB)

Test

Tape

P-4-A100

10kHz,

~10dB

Azimuth

Adjustment

Level

Adjustment

Tape

Speed

Adjustment

P-4-L300

315Hz,

0dB

WS-48B

3kHz,

0dB

0dB=0.775V

Record/Playback

Head(TC-K370)

Azimuth

Adjustment

Record/Playback/Erase

Head(TC-RX370)

Procedure:

Forward

Playback

Mode

test

tape

P-4-A100

(10kHz,

—10dB)

LINE

OUT

Turn

the

adjustment

screw

for

the

maximum

output

levels.

these

levels

notmatch,

turn

the

adjustment

screw

until

both

output

levels

match

together

within

1dB.

L-CH

peak

within

1dB

R-CH

peak

screw

position

screw

Eur

R-CH

angle

Phase

check

Playback

Mode

test

tape

P-4-A100

(10kHz,

—10dB)

oscilloscope

L-CH

47kQ

LINE

OUT

Screen

pattern

phase

45°

90°

135°

180°

EEEEEEREENSSSSEEREEIIED

ammnemeneeeeeeeeed

good

wrong

Change

the

reverse

playback

mode

and

repeat

the

steps

(TC-RX370)

After

the

adjustment,

lock

the

adjustment

screw

with

suitable

locking

compound.

Adjustment

Location

—

record/playback/erase

head

—

TC-K370

FWD(Adjustment

screw)

TC-RX370

Adjustment

screw

Tape

Speed

Adjustment

Procedure:

—Forward

Playback

Mode—

test

tape

WS-48B

(3kHz,

OdB)

frequency

counter

LINE

OUT

Perform

high

speed

adjustment

before

normal

speed

adjust-

ment.

(high

speed

adjustment)

Set

FWD

playback

mode.

Keep

pressing

the

HIGH

SPEED

DUBBING

switch.

Adjust

RV72

that

the

frequency

counter

reading

becomes

6,000+30Hz.

(normal

speed

adjustment)

Set

FWD

playback

mode.

Adjust

RV71

that

the

frequency

counter

reading

becomes

3,000+10Hz.

Frequency

difference

between

the

beginning

and

the

end

the

tape

should

within

3%.

Adjustment

Location:

AUDIO

board

Playback

Level

Adjustment

Procedure

—Forward

Playback

Mode—

test,

tape

P-4-L300

(315Hz,

OdB)

LINE

OUT

Adjust

RV11

(L-CH)

and

RV21

(R-CH)

the

VITVM

reading

becomes

the

adjustment

limits

below.

Adjustment

Value

LINE

OUT

level:

—5+0.5dB

(0.412

0.461V)

Level

Difference

between

Channels:

within

0.5dB

Confirm

the

LINE

OUT

level

does

not

change

playback

mode

while

changing

the

mode

from

playback

stop

several

times.

Adjustment

Location:

AUDIO

board

Bias

Consumption

Current

Adjustment

This

adjustment

should

perfomed

when

replacing

the

head

assy

the

bias

oscillating

transformer

(T81,

T91).

Procedure:

(

R-CH

digital

voltmeter

blank

tape

CS-413

set

—_

LINE

signal

Connect

the

digital

voltmeter

test

point

TP81.

Set

RV81

(RV91)

mechanical

center.

Set

FWD

record

mode.

Adjust

T81(T91)

that

the

digital

voltmeter

reading

becomes

minimum.

Adjustment

Location:

AUDIO

board

Record

Bias

Adjustment

Setting

REC

LEVEL

control:

standard

record

position

(Refer

page

6.)

Procedure:

Record

Mode

etek

blank

tape

CS-123

315Hz

l1OkHz

LINE

}

31.6mV

(—27.8dB)

Playback

Mode

LINE

OUT

Playbck

the

signal

recorded

step

Confirm

that

the

10kHz

playback

output

0+0.5dB

relative

the

315Hz

output.

necessary,

adjust

RV81

(L-CH),

RV91

(R-CH)

and

repeat

the

steps

given

above.

Adjustment

Location:

AUDIO

board

Record

Level

Adjustment

Setting:

REC

LEVEL

control:

standard

record

position

(Refer

page

)

Procedure:

Record

Mode

OSC

attenuator

oneee)

Wpaekenend

O-——-O

ENDL

blank

tape

CS$-123

LINE

315Hz,

31.6mV

(—27.8dB)

Playback

Mode

recorded

portion

LINE

OUT

Confirm

playback

the

tape

recorded

become

adjustment

level

follows.

necessary,

adjust

RV101

(L-CH),

RV201

(R-CH)

and

repeat

steps

and

Adjustment

Value

LINE

OUT

level:

—27.8+0.5dB

(29

33.4mV)

Adjustment

Location:

PANEL

Board

—Adjustment

Parts

Location

Diagrams—

{PANEL

BOARD]

(COMPONENT

SIDE)

RV502

|_|

RV503

RV50I

RVIO!

(L-CH)

RV201

(R-CH)

Record

Level

(AUDIO

BOARD)

(COMPONENT

SIDE)

RV81

(L-CH)

Bias

Consumption

Current

IC81

RVQ1

Record

Bias

R-CH

RV72

(HIGH)

Tabe

Speed

RV71

(NORMAL)

TP81

Bias

Consumption

T91

Current

(R-CH)

RV21(R-CH)

RV11(L-CH)

Playback

Level

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