Sony TC-RX77 Manuale utente

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TC-RX77/RX7TTES

SERVICE

MANUAL

Dolby

noise

reduction

manufactured

under

license

from

Dolby

Laboratories

Licensing

Corporation.

“DOLBY”

and

the

double-D

symbol

00)

are

trademarks

of

Dolby

Laboratories

Licensing

Corporation.

4-track

2-channel

stereo

Approx.

90

sec.

(with

Sony

C-60

Recording

system

Fast-winding

time

cassette)

Bias

AC

bias

Heads

Erasing

head

x

1

(ferrite

head)

Playback/Recording

head

x

1

(LA

head)

Motors

Capstan

motor

x

1

(DC

servo

motor)

Reel

motor

x

1

(DC

motor)

ASIST

(mechanical

drive)

motor

x

1

(DC

motor)

Signal-to-noise

ratio

(at

peak

level)

Type

IV

(Sony

METAL-SLT)

|

59dB

|

67

4B

Type

Il

(Sony

UX-S)

58dB

|

66dB

Total

harmonic

distortion

1%

(with

Sony

METAL-SLT

cassette)

Frequency

response

(DOLBY

NR

OFF)

20-

20,000Hz

(+

3db,/EC)

(US,

Canadian

models)

25-19,000Hz

(+

3db,JEC)

(AEP)

Type

Il

cassette

25

-

17,000

Hz

(+3

dB,

IEC)

(Sony

UX-S)

Type

|

cassette

25

-

16,000

Hz

(+3

dB,

IEC)

(Sony

HF-S)

Wow

and

flutter

+0.09%

W.

Peak

(IEC)

0.06%

WRMS

(NAB).

+0.16%

W.

Peak

(DIN)

Type

IV

cassette

(Sony

METAL-SLT)

Dolby

NR

switch

OFF

B-Type

|

C-Type

ON

ON

|

—

US

Model

Canadian

Model

TC-RX77TES

AEP

Model

TC-RX77

Model

Name

Using

Similar

Mechanism

TC-RX70/RX70ES

Tape

Transport

Mechanism

Type

TCM

-

200R6

hg

s

Inputs

(phone

Outputs

Line

outputs

(phono

jacks)

Headphones

(stereo

phone

jack)

Line

inputs

(phono

jacks)

Microphone

inputs

77.5

mV

Input

impedance

|

47

k

ohms

Sensitivity

(For

a

|

0.25

mV

low-impedance

|

microphone)

jacks)

Rated

output

level]

0.32

V

ata

load

impedance

of

47

k

ohms

Load

impedance

|

Over

10

k

ohms

Output

level

0-1.25

mW

ata

load

impedance

of

32

ohms

General

Power

requirements

RX77ES

:

120

V

AC,

60Hz

(US,

Canadian

models)

RX77

=:

220V

AC,

50/60Hz

(AEP

model)

Power

consumption

20W

Dimensions

Approx.

430

x

123

x

300

mm

(w/h/d)

(17

x

4%

x

117%

inches)

including

projecting

parts

and

controls

Weight

Approx.

4.7

kg

(10

Ibs

6

02)

Supplied

accessory

Audio

connecting

cords

(2)

Design

and

specifications

subject

to

change

without

notice.

STEREO

CASSETTE

DECK

SONY.

TC-RX77/RX77ES

TABLE

OF

CONTENTS

Section

Title

Page

Specification

S/S

BS

Sea

a

eee

er

eser

ee

rete:

eve

eens

ewe

Nec

ene

<a

tenerer

ole

al

Gee

eee

1

;

Model

Identification

wey

el

ole

tenes

te

eS"

SU

SNS.

SSUES

Slee

ws

ere

ere

reset

eieven

ese.

2

Safety

Check-Out

BOBO

bib

SNS

Ow

co

Le:

WLS

Ge

Ver

ONS

eee

cede.

8

Je~eueitior

enete:

®

2

1

GENERAL

6

80s

eiide

ated

ceiieie

oe

ecloew

ind

B9G

56

Res

3

2:

DISASSEMBLY

str

xe

kite

o0es

Os

eee

Eas

eet

kos

4

3

ADJUSTMENTS

<6

6

teria

tees

his

eet

ely

g

sei

alee

be

7

3-1.

Mechanical

Adjustment

++++++++sseeresereree

t

3-2.

Electrical

Adjustment

6

Wns ele

eet

eats,

oC

ew

onal

eke

ere

wisete

7

.

DIAGRAMS

4-1.

Semiconductor

Lead

Layout:::t+rrrrste

eee

11

4-2,

Circuit

Boards

Location

-+++++rssee

reste

cers

11

4-3,

Printed

Wiring

Boards

-++++++++seeee

reece

12

4-4,

Schematic

Diagram

aie

aiid Gute

Sie

vale

Loiieyecene

iene

tobe

peceneceie

17

EXPLODED

VIEWS

<tesesc0esxetaceatver

sieht

cass

16

5-1.

Front

Panel

Section

-s+ssserssee

ee

eeeeeeeees

23

.

5-2,

Chassis

Section

EO

RO

a

eR

RC

RT

REN

Re

Ae

24

5-3.

Mechanism

Section

(TCM~200R6)

«++++++++>

25

5-4.

Mechanism.

Section

(TCM-200R6)

---+-:++++-

26

_

ELECTRICAL

PARTS

LIST

<:--:--ceececcreceeenee

27

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

BY

MARK

A

OR

DOTTED

LINE

WITH

MARK

A

ON

THE

SCHEMATIC

DIAGRAMS

AND

IN

THE

PARTS

LIST

ARE

CRITICAL

TO

SAFE

OPERATION.

REPLACE

THESE

COMPONENTS

WITH

SONY

PARTS

WHOSE

PART

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

MANUAL

OR

IN

SUPPLEMENTS

PUB-

LISHED

BY

SONY.

ATTENTION

AU

COMPOSANT

AYANT

RAPPORT

A

LA

SECURITE!

LES

COMPOSANTS

IDENTIFIES

PAR

UNE

MARQUE

/\

SUR

LES

DIAGRAMMES

SCHEMATIQUES

ET

LA

LISTE

DES

PIECES

SONT

CRITIQUES

POUR

LA

SECURITE

DE

FONCTIONNEMENT.

NE

REMPLACER

CES

COM-

POSANTS

QUE

PAR

DES

PIECES

SONY

DONT

LES

NUMEROS

SONT

DONNES

DANS

CE

MANUEL

OU

DANS

LES

SUPPLEMENTS

PUBLIES

PAR

SONY.

SAFETY

CHECK-OUT

After

correcting

the

original

service

problem,

perform

the

following

safety

check

before

releasing

the

set

to

the

customer:

Check

the

antenna

terminals,

metal

trim,

‘“‘metallized”’

knobs,

screws,

and

all

other

exposed

metal

parts

for

AC

leakage.

Check

leakage

as

described

below.

LEAKAGE

TEST

The

AC

leakage

from

any

exposed

metal

part

to

earth

ground

and

from

all

exposed

metal

parts

to

any

exposed

metal

part

having

a

return

to

chassis,

must

not

exceed

0.5mA

(500

microampers).

Leakage

current

can

be

measured

by

any

one

of

three

methods.

1.

A

commercial

leakage

tester,

such

as

the

Simpson

229

or

RCA

WT-S40A.

Follow

the

manufacturers’

instructions

to

use

these

instru-

ments.

2.

<A

battery-operated

AC

milliammeter.

The

Data

Precision

245

digital

multimeter

is

suitable

for

this

job.

3.

Measuring

the

voltage

drop

across

a

resistor

by

means

of

a

VOM

or

battery-operated

AC

volt-

meter.

The

“limit”

indication

is

0.75

V,

so

analog

meters

must

have

an

accurate

low-

voltage

scale.

The

Simpson

250

and

Sanwa

SH-63Trd

are

examples

of

a

passive

VOM

that

is

suitable.

Nearly

all

battery

operated

digital

multimeters

that

have

a

2V

AC

range

are

suitable.

(See

Fig.

A)

To

E.

xposed

Metal

Parts

on

Set

LAs

0.15

uF

voltmeter

A

628)

=

Earth

Ground

Using

an

AC

voltmeter

to

check

AC

leakage.

TC-RX77/RX77ES

SECTION

1

GENERAL

This

section

is

extracted

from

instraction

manual.

Identification

of

Front

Panel

Parts

*Remote

control

sensor

30

beste

at

@

MEADE

MNES

Dae

We

@

For

details,

refer

to

the

page

number

indicated

in

@.

Tape

operation

buttons

€

(leftward

fast

winding)

button

bP

(rightward

fast

winding)

button

i

(stop)

button

~@

(reverse

play)

button

w-

(forward

play)

button

HE

PAUSE

(pause)

button

O

REC

MUTE

(record

muting)

button

@

(4]

POWER

switch

[9]

MPX

FILTER

button

@®

[2]

Cassette

holder

&]

BALANCE

control

@

Counter

buttons

RESET

button

©

MEMORY

button

@

©

al

REC

(recording)

LEVEL

control

@

®

fs

PHONE

(headphones)

LEVEL

control

@

[4]

LINEAR

COUNTER

©

[5]

PEAK

LEVEL

METER

®

les]

HEADPHONES

jack

(stereo

phone

jack)

@

ra

DOLBY

NR

(noise

reduction

switch)

@

@

@

REC

(record)

button

[8]

&

OPEN/CLOSE

button

[6]

DISPLAY

MODE

button

@

IN

FADER

button

@

ARL

(automatic

recording

level)

control

and

indicator

@

[o0

*Remote

control

sensor

You

can

remotely

control

this

cassette

deck

with:

fal

MICROPHONE

jacks

(phone

jacks)

fa]

BIAS

control

®

—

Aremote

commander

that

came

with

a

Sony

amplifier

or

receiver

if

it

has

the

tf

mark

and

cassette

deck

control

capability.

—

An

optional

Sony

remote

commander

with

the

lf

mark

and

cassette

deck

control

capability.

YorYahahivescheceye

mee)

MM

a{=t;)

am

ov:

1012)

Mm

ons)

8

C3)

LINE

IN

(line

input)

jacks

'——'

CONTROL-S

input

Connect

to

the

CONTROL-

S

terminal

of

a

Sony

amplifier

or

receiver

for

remote

control.

(US,

Canadian

model)

AC

power

cord

TIMER

switch

®

20}

DIRECTION

mode

switch

@

@

Features

For

higher

quality

recording/playback

*

The

Dolby

HX

PRO*

system

which

improves

the

linearity

of

the

tape’s

high-range

response

during

recording.

¢

B

and

C

type

Dolby

NR*

systems

which

reduce

tape

noise.

«

Bias

calibration

to

achieve

the

optimum

bias

current

setting

for

any

tape.

For

your

convenience

*

Quick

reversing

at

the

end

of

a

tape

to

minimize

interruptions

during

playback

and

recording.

*

The

AMS

and

Memory

Play

functions

which

provide

easy

access

to

a

desired

selection.

*

Automatic

recording

level

adjustment

for

one-touch

protection

against

distortion.

*

Timer-activated

playback

and

recording

through

the

use

of

an

optional

timer.

*

Automatic

switching

between

line

and

microphone

input

when

recording

with

a

microphone.

¢

Display

mode

button

which

allows

you

to

select

normal

display,

counter

only

or

display

off.

For

easier

operation

«

Fade-in

and

Fade-out

functions

to

start

and

end

recordings

with

a

professional

touch.

«

Easy-to-read

digital

linear

counter

which

shows

the

elapsed

recording

or

playing

time.

TC-RX77/RX77ES

|

Note:

Follow

the

disassembly

procedure

in

the

numerical

order

given.

Unscrew

the

four

case

attachment

screws

M3

x

8

and

remove

the

upper

case.

MAIN

BOARD

SECTION

2

DISASSEMBLY

@

+

BVTT3

x8

MECHANISM

@

CASSETTE

LID

ASSY

®

+

BVIT3x6

@

+

BVTT3

x

8

@

+BVIT3x6

CASSETTE

HOLDER

@

Push

LEVER

(LIFTER)

in

the

direction

of

arrow

and

remove

CASSETTE

HOLDER.

LEVER

JOINT

Q

CASSETTE

HOLDER

’

SHAFT

(LEFT)

Cael

@TENSION

SPRING

(CASSETTE

HOLDER)

@

STOPPER

WASHER

ORNAMENTAL

PLATE

@

Push

LEVER

(LIFTER)

in

the

direction

of

arrow

and

remove

ORNAMENTAL

PLATE.

;

@

+

BrP26x6

PINCH

LEVER/HEAD

@

Removal

of

HEAD

ad

©

at,

‘Ses

@

LEVER

(FR)

ESN

Seas

/

@

WASHER

Oo

gk

ie

Release

caw!

3

(

VN.

©

HEAD

‘G

:

~

NX

MG

Release

ie

GP?

claw.

\

@

LEVER

(PINCH

R)

@

LEVER

(PINCH

F)

=

hes

MOTOR

PULLEY

Turn

MOTOR

PULLEY

by

a

finger

in

the

direction

of

arrow

@

and

confirm

that

HEAD

has

turned

in

the

direction

of

arrow

(5).

CAPSTAN

MOTOR/

FLYWHEEL

TC-RX77/RX77ES

ie

LB

Hook

BELT

here

temporarily

B2.6

x

3

\

when

reassembling.

eas

@

+

PTPWH2

x

25

@

FLYWHEEL

oe

@

REV)

@CAPSTAN

MOTOR

@

BRACKET

(THRUST

@+

BTP2

x

18

RETAINER

R)

35—@

+

BVTP2.6

x

8

REEL

and

ASSIST

MOTORS

@

+

BTP2x

18

Align

BOSS

of

MODE

CAM

to

the

point

when

reassembling.

0+

B2.6x6

LEAL)

SD

ANZ

YR

SELECTION

LEVER

MODE

CAM

|

LB

\,

Hook

BELT

here

temporarily

when

reassembling.

Align

the

line

on

MODE

CAM

to

the

tip

of

SELECTION

LEVER.

@

ASSIST

MOTOR

SPACER

(MOTOR)

=

grackET

(MOTOR

R)

@

REEL

MOTOR

ASSY

@

REEL

MOTOR

BOARD

ia;

eae

TC-RX77/RX77ES

|

SECTION

3

ADJUSTMENTS

3-1,

MECHANICAL

ADJUSTMENTS

PRECAUTION

1,

Clean

the

following

parts

with

a

denatured-

alcohol-moistened

swab

:

record/playback

head

pinch

roller

erase

head

rubber

belts

capstan

idler

2,

Demagnetize

the

record/playback

head

with

a

head

demagnetizer,

3.

Do

not

use

a

magnetized

screwdriver

for

the

ad-

justments,

4,

After

the

adjustments,

apply

suitable

locking

compound

to

the

parts

adjusted,

TORQUE

MEASUREMENT

CQ-102C

[80

-

60g

cm

(0.42

—

0.8302

inch)

F

WD

-

WD

CQ-

102C

1—5g+cm

(0.014

—

0.0690z

+

inch)

Back

tention

REV

=

TREV.——sT«Ss

CQ

102RC_—«

[30

-

60g

+cm

(0.42

—

0.830z*

inch)

REV

.

CQ~

102RC

Back

tention

FF,

REW

CQ~-201B

65

—90*cm

(0.9

—

1.2502

«

inch)

1—5gecm

(0.014

—

0,0690z

+

inch)

3-2,

ELECTRICAL

ADJUSTMENT

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

both

L-

CH

and

R-CH,

*

Switches

and

controls

should

be

set

as

follows

unless

otherwise

specified,

DOLBY

NR

switch

:

OFF

DIRECTION

switch

oe

¢

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

VTVM

me)

10k

Q

O

Attenuator

e—_—

oO

O

I]

ooo

|

ee

|

LINE.

IN

LINE

OUT

Standard

Input

Level

input

terminal

LINE

IN

Standard

Output

Level

Test

Tape

P-4-A100

10kHz,

—10dB

Azimuth

Adjustment

P-4-L300

315Hz,

0dB

PB

Level

Adjustment

3kHz,

0dB

Tape

Speed

Adjustment

Test

Mode

1,

Put

the

set

into

the

test

mode

by

shorting

test

point

TP801

(TEST)

of

the

main

bord

during

the

set

is

turned

off.

2.

Remove

the

short

after

the

Electrical

Adjustment

is

completed.

Record

Playback

Head

Azimuth

Adjustment

Procedure

:

1,

Mode:

FWD

playback

Test

tape

P-4-A100

(LOkHz,

—10dB)

VTVM

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

1dB.

,

L-CH

k

a

within

1dB

R-CH

peak

Screw

position

3.

Phase

Check

Adjustment

Location

:

Mode

:

playback

motor

rear

side

test

tape

variable

resister

P-4-A100

(10kHz,

—

10dB)

oscilloscope

LCH

ATK

Q

LINE

OUT

Screen

pattern

in

phase

45°

90°

135°

180°

——_-—————”

good

wrong

4,

Set

in

the

REV

mode

and

repeat

the

step

1-8,

5,

After

the

adjustment,

lock

the

screws

with

locking

Playback

Level

Adjustment

compound,

Procedure

:

Adjustment

Location

:

Record/Playback

head

Mode

:

playback

test

tape

P-4-L300

(315kHz,

0dB)

VTVM

FWD

REV

Sd

Adjustment

screw

LINE

OUT

Adjust

RV101

(L-ch)

and

RV201

(R~ch)

so

that

the

reading

on

Tape

Speed

Adjustment

VTVM

meets

the

adjustment

limits

below.

Setting

:

test

pin

TP801

:

short

Adjustment

Limits

:

LINE

OUT

level:

—7.7dBs(m)

+

0.5dB(0.3~0.34V)

Procedure

:

Level

difference

between

channels:

less

than

0.5dB

Check

that

the

LINE

OUT

level

does

not

change

even

if

Playback

and

Stop

operation

is

repeated

several

times.

Mode

:

playback

test

tape

Adjustment

Location:

Main

board

WS-48B

(3kHz,

OdB)

jo

frequency

counter

1.

Set

to

FWD

playback

mode.

2.

Adjust

motor

rear

side

(variable

resistor)

so

that

the

frequency

counter

reading

becomes

3,000

+

15Hz.

Bias

Current

Adjustment

Procedure

:

LINE

IN

(no

signal)

CS-413

blank

tape

digital

voltmeter

47k

L-CH

oO

x

Ana

ces

|

TP301

B+

(+7.5V)

1.

Set

RV103

and

RV203

to

mechanical

center

and

turn

the

set

recording

mode.

2.

Connect

digital

voltmeter

as

shown

by

the

following

table.

38.

Adjust

the

following

transformers

for

the

minimum

readings

on

the

digital

voltmeter.

Adjustment

Part

@

and

@,

TP301

T101

not

more

than

.®

and

©,

TP301

T201

130mV

Adjustment

Location:

Main

board

Record

Bias

Adjustment

Setting

:

REC

LEVEL

control:

Standard

Record

(See

page

7.)

test

pin

TP801:

short

Procedure

:

1,

Mode:

record

sine

CS-123

10k

Q

blank

tape

ae)

attenuator

Of

ny

o—o

I]

ooo

|

|

eee

|

LINE

IN

1)

315Hz

2)

10kHz

24.5mV(—

30dBs(m))

2.

Mode:

playback

recorded

portion

po

Playback

the

signal

recorded

in

step

1.

Confirm

that

the

10kHz

playback

output

is

0+0.5dB

relative

to

the

315Hz

output.

If

necessary,

adjust

RV103

(L-ch)

and

RV203

(R-ch)

for

repeat

the

steps

given

above.

VTVM

LINE

OUT

Adjustment

Location:

Main

board

Record

Level

Adjustment

Setting:

REC

LEVEL

control:

Standard

Record

(See

page

7.)

test

pin

TP801:

short

Procedure

:

1,

Mode:

record

AF

OSC

€)

attenuator

(oe)

VTVM

LINE

OUT

LINE

IN

315Hz,

32.2mV(—

27.7dBs(m))

2.

Mode:

playback

recorded

portion

LINE

OUT

3.

Playback

the

signal

recorded

in

stepl.

Confirm

that

the

signal

level

is

within

the

adjustment

limits

below.

If

necessary,

adjust

RV102

(L-ch)

and

RV202

(R-ch)

repeat

the

stepl-2.

Adjustment

Limits:

—27.7dBs(m)

+

0.5dB(80.4~34.2mV)

Adjustment

Location:

Main

board

Quick

Reverse

Sensitivity

Adjustment

Conditions

:

DIRECTION

MODE

switch

:

y=

digital

voltmeter

Adjustment

procedure:

Quick

reverse

adjustment

tape

(Leader

of

the

‘

nee

black

cassette

tape)

TP802

Connect

the

digital

voltmeter

to

test

point

TP802.

2.

Load

quick

reverse

adjustment

tape

and

play

back

the

leading

portion

in

FWD

mode.

3.

Adjust

the

RV801

for

4.5+0.5V

reading

on

the

digital

voltmeter.

Play

back

quick

reverse

adjustment

tape

in

FWD

mode

again.

Confirm

that

the

reading

on

the

digital

voltmeter

is

“L”

level

at

the

magnetic

portion

of

the

tape.

6.

Confirm

that

the

tape

stop

around

the

tape

end

(boder

of

the

leading

and

the

magnetic

portions).

Adjustment

Location:

Main

board

220i:

Adjustment

Parts

Location

—Main

board

-

RV102

(L-ch)

RV202

(R-ch)

Record

Level

TP801

Test

Mode

point

RV101

(L-ch)

RV201

(R-ch)

Playback

Level

TP802

Quick

Reverse

Test

point

T101

(L-ch)

7201

ee

Bias

Current

RV801

Quick

Reverse

TP301

Bias

Current

Test

point

RV203

(R-ch)

RV103

ah

Record

Bias

240

=

SECTION

4

DIAGRAMS

4-1.

SEMICONDUCTOR

LEAD

LAYOUTS

DTA114ES

RBA402

SEL2210S-C

DTA144ES

DTC114ES

DTC143TS

2SA1175-HFE

tong

short

2SB1116A-L

2SC2603~-

EF

node

—

cathode

28C945-P

28D1020-HFE

aad

peseall

GP2S22B

HZS7AIL

UZL~-7H1

UZL-12M1

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|

CaTuocE

emitter

4

Y

ANOCE

2SB1370~-EF

28D1312-K

10E2N

21DQ05

4-2.

CIRCUIT

BOARDS

LOCATION

POWER

BOARD

REEL

MOTOR

BOARD

MD

BOARD

SW

BOARD

MAIN

BOARD

HEAD

TRANSLATION

BOARD

DISPLAY

BOARD

REC

LEVEL

BOARD

DOLBY

“BAL

BOARD

HEADPHONES

BOARD

MIC

BOARD

a

4-3.

PRINTED

WIRING

BOARDS

4-3-1.

FORMER

TYPE

(Main

Board

US

model

and

Main

Board

No.

1-638-124-12

only.)

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