Sony TC-RX77 Manuale utente

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

Dolby

Laboratories

Licensing

Corporation.

4-track

2-channel

stereo

Approx.

sec.

(with

Sony

C-60

Recording

system

Fast-winding

time

cassette)

Bias

bias

Heads

Erasing

head

(ferrite

head)

Playback/Recording

head

(LA

head)

Motors

Capstan

motor

(DC

servo

motor)

Reel

motor

(DC

motor)

ASIST

(mechanical

drive)

motor

(DC

motor)

Signal-to-noise

ratio

(at

peak

level)

Type

(Sony

METAL-SLT)

59dB

Type

(Sony

UX-S)

58dB

66dB

Total

harmonic

distortion

(with

Sony

METAL-SLT

cassette)

Frequency

response

(DOLBY

OFF)

20-

20,000Hz

3db,/EC)

(US,

Canadian

models)

25-19,000Hz

3db,JEC)

(AEP)

Type

cassette

17,000

(+3

dB,

IEC)

(Sony

UX-S)

Type

cassette

16,000

(+3

dB,

IEC)

(Sony

HF-S)

Wow

and

flutter

+0.09%

Peak

(IEC)

0.06%

WRMS

(NAB).

+0.16%

Peak

(DIN)

Type

cassette

(Sony

METAL-SLT)

Dolby

switch

OFF

B-Type

C-Type

—

Model

Canadian

Model

TC-RX77TES

AEP

Model

TC-RX77

Model

Name

Using

Similar

Mechanism

TC-RX70/RX70ES

Tape

Transport

Mechanism

Type

TCM

200R6

Inputs

(phone

Outputs

Line

outputs

(phono

jacks)

Headphones

(stereo

phone

jack)

Line

inputs

(phono

jacks)

Microphone

inputs

77.5

Input

impedance

ohms

Sensitivity

(For

0.25

low-impedance

microphone)

jacks)

Rated

output

level]

0.32

ata

load

impedance

ohms

Load

impedance

Over

ohms

Output

level

0-1.25

ata

load

impedance

ohms

General

Power

requirements

RX77ES

120

AC,

60Hz

(US,

Canadian

models)

RX77

220V

AC,

50/60Hz

(AEP

model)

Power

consumption

20W

Dimensions

Approx.

430

123

300

(w/h/d)

(17

117%

inches)

including

projecting

parts

and

controls

Weight

Approx.

4.7

(10

Ibs

02)

Supplied

accessory

Audio

connecting

cords

(2)

Design

and

specifications

subject

change

without

notice.

STEREO

CASSETTE

DECK

SONY.

TC-RX77/RX77ES

TABLE

CONTENTS

Section

Title

Page

Specification

S/S

Sea

eee

eser

rete:

eve

eens

ewe

Nec

ene

tenerer

ole

Gee

eee

;

Model

Identification

wey

ole

tenes

eS"

SNS.

SSUES

Slee

ere

reset

eieven

ese.

Safety

Check-Out

BOBO

bib

SNS

Le:

WLS

Ver

ONS

eee

cede.

Je~eueitior

enete:

GENERAL

80s

eiide

ated

ceiieie

ecloew

ind

B9G

Res

DISASSEMBLY

str

kite

o0es

eee

Eas

eet

kos

ADJUSTMENTS

teria

tees

his

eet

ely

sei

alee

3-1.

Mechanical

Adjustment

++++++++sseeresereree

3-2.

Electrical

Adjustment

Wns ele

eet

eats,

onal

eke

ere

wisete

DIAGRAMS

4-1.

Semiconductor

Lead

Layout:::t+rrrrste

eee

4-2,

Circuit

Boards

Location

-+++++rssee

reste

cers

4-3,

Printed

Wiring

Boards

-++++++++seeee

reece

4-4,

Schematic

Diagram

aie

aiid Gute

Sie

vale

Loiieyecene

iene

tobe

peceneceie

EXPLODED

VIEWS

<tesesc0esxetaceatver

sieht

cass

5-1.

Front

Panel

Section

-s+ssserssee

eeeeeeeees

5-2,

Chassis

Section

REN

5-3.

Mechanism

Section

(TCM~200R6)

«++++++++>

5-4.

Mechanism.

Section

(TCM-200R6)

---+-:++++-

ELECTRICAL

PARTS

LIST

<:--:--ceececcreceeenee

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.

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.

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

0.5mA

(500

microampers).

Leakage

current

can

measured

any

one

three

methods.

commercial

leakage

tester,

such

the

Simpson

229

RCA

WT-S40A.

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.

xposed

Metal

Parts

Set

LAs

0.15

voltmeter

628)

Earth

Ground

Using

voltmeter

check

leakage.

TC-RX77/RX77ES

SECTION

GENERAL

This

section

extracted

from

instraction

manual.

Identification

Front

Panel

Parts

*Remote

control

sensor

beste

MEADE

MNES

Dae

For

details,

refer

the

page

number

indicated

Tape

operation

buttons

€

(leftward

fast

winding)

button

(rightward

fast

winding)

button

(stop)

button

(reverse

play)

button

(forward

play)

button

PAUSE

(pause)

button

REC

MUTE

(record

muting)

button

(4]

POWER

switch

[9]

MPX

FILTER

button

@®

[2]

Cassette

holder

BALANCE

control

Counter

buttons

RESET

button

MEMORY

button

REC

(recording)

LEVEL

control

PHONE

(headphones)

LEVEL

control

[4]

LINEAR

COUNTER

[5]

PEAK

LEVEL

METER

les]

HEADPHONES

jack

(stereo

phone

jack)

DOLBY

(noise

reduction

switch)

REC

(record)

button

[8]

OPEN/CLOSE

button

[6]

DISPLAY

MODE

button

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

Sony

amplifier

receiver

has

the

mark

and

cassette

deck

control

capability.

—

optional

Sony

remote

commander

with

the

mark

and

cassette

deck

control

capability.

YorYahahivescheceye

mee)

a{=t;)

ov:

1012)

ons)

C3)

LINE

(line

input)

jacks

'——'

CONTROL-S

input

Connect

the

CONTROL-

terminal

Sony

amplifier

receiver

for

remote

control.

(US,

Canadian

model)

power

cord

TIMER

switch

20}

DIRECTION

mode

switch

Features

For

higher

quality

recording/playback

The

Dolby

PRO*

system

which

improves

the

linearity

the

tape’s

high-range

response

during

recording.

and

type

Dolby

NR*

systems

which

reduce

tape

noise.

Bias

calibration

achieve

the

optimum

bias

current

setting

for

any

tape.

For

your

convenience

Quick

reversing

the

end

tape

minimize

interruptions

during

playback

and

recording.

The

AMS

and

Memory

Play

functions

which

provide

easy

access

desired

selection.

Automatic

recording

level

adjustment

for

one-touch

protection

against

distortion.

Timer-activated

playback

and

recording

through

the

use

optional

timer.

Automatic

switching

between

line

and

microphone

input

when

recording

with

microphone.

Display

mode

button

which

allows

you

select

normal

display,

counter

only

display

off.

For

easier

operation

Fade-in

and

Fade-out

functions

start

and

end

recordings

with

professional

touch.

Easy-to-read

digital

linear

counter

which

shows

the

elapsed

recording

playing

time.

TC-RX77/RX77ES

Note:

the

disassembly

procedure

the

numerical

order

given.

Unscrew

the

four

case

attachment

screws

and

remove

the

upper

case.

MAIN

BOARD

SECTION

DISASSEMBLY

BVTT3

MECHANISM

CASSETTE

LID

ASSY

BVIT3x6

BVTT3

+BVIT3x6

CASSETTE

HOLDER

Push

LEVER

(LIFTER)

the

direction

arrow

and

remove

CASSETTE

HOLDER.

LEVER

JOINT

CASSETTE

HOLDER

’

SHAFT

(LEFT)

Cael

@TENSION

SPRING

(CASSETTE

HOLDER)

STOPPER

WASHER

ORNAMENTAL

PLATE

Push

LEVER

(LIFTER)

the

direction

arrow

and

remove

ORNAMENTAL

PLATE.

;

BrP26x6

PINCH

LEVER/HEAD

Removal

HEAD

at,

‘Ses

LEVER

(FR)

ESN

Seas

WASHER

Release

caw!

(

VN.

HEAD

‘G

Release

GP?

claw.

LEVER

(PINCH

LEVER

(PINCH

hes

MOTOR

PULLEY

Turn

MOTOR

PULLEY

finger

the

direction

arrow

and

confirm

that

HEAD

has

turned

the

direction

arrow

(5).

CAPSTAN

MOTOR/

FLYWHEEL

TC-RX77/RX77ES

Hook

BELT

here

temporarily

B2.6

when

reassembling.

eas

PTPWH2

FLYWHEEL

REV)

@CAPSTAN

MOTOR

BRACKET

(THRUST

BTP2

RETAINER

35—@

BVTP2.6

REEL

and

ASSIST

MOTORS

BTP2x

Align

BOSS

MODE

CAM

the

point

when

reassembling.

B2.6x6

LEAL)

ANZ

SELECTION

LEVER

MODE

CAM

Hook

BELT

here

temporarily

when

reassembling.

Align

the

line

MODE

CAM

the

tip

SELECTION

LEVER.

ASSIST

MOTOR

SPACER

(MOTOR)

grackET

(MOTOR

REEL

MOTOR

ASSY

REEL

MOTOR

BOARD

ia;

eae

TC-RX77/RX77ES

SECTION

ADJUSTMENTS

3-1,

MECHANICAL

ADJUSTMENTS

PRECAUTION

Clean

the

following

parts

with

denatured-

alcohol-moistened

swab

record/playback

head

pinch

roller

erase

head

rubber

belts

capstan

idler

Demagnetize

the

record/playback

head

with

head

demagnetizer,

not

use

magnetized

screwdriver

for

the

ad-

justments,

After

the

adjustments,

apply

suitable

locking

compound

the

parts

adjusted,

TORQUE

MEASUREMENT

CQ-102C

[80

60g

(0.42

—

0.8302

inch)

CQ-

102C

1—5g+cm

(0.014

—

0.0690z

inch)

Back

tention

REV

TREV.——sT«Ss

102RC_—«

[30

60g

+cm

(0.42

—

0.830z*

inch)

REV

CQ~

102RC

Back

tention

FF,

REW

CQ~-201B

—90*cm

(0.9

—

1.2502

inch)

1—5gecm

(0.014

—

0,0690z

inch)

3-2,

ELECTRICAL

ADJUSTMENT

Note:

The

adjustment

should

performed

the

order

given

the

service

manual.

rule,

adjustments

about

playback

should

performed

before

those

about

recording.

The

adjustments

should

performed

for

both

L-

and

R-CH,

Switches

and

controls

should

set

follows

unless

otherwise

specified,

DOLBY

switch

OFF

DIRECTION

switch

Standard

Record:

Deliver

the

standard

input

signal

level

the

input

jack

and

set

the

REC

LEVEL

control

obtain

the

standard

output

signal

level,

—Record

Mode—

OSC

VTVM

me)

10k

Attenuator

e—_—

ooo

LINE.

LINE

OUT

Standard

Input

Level

input

terminal

LINE

Standard

Output

Level

Test

Tape

P-4-A100

10kHz,

—10dB

Azimuth

Adjustment

P-4-L300

315Hz,

0dB

Level

Adjustment

3kHz,

0dB

Tape

Speed

Adjustment

Test

Mode

Put

the

set

into

the

test

mode

shorting

test

point

TP801

(TEST)

the

main

bord

during

the

set

turned

off.

Remove

the

short

after

the

Electrical

Adjustment

completed.

Record

Playback

Head

Azimuth

Adjustment

Procedure

Mode:

FWD

playback

Test

tape

P-4-A100

(LOkHz,

—10dB)

VTVM

LINE

OUT

Turn

the

adjustment

screw

for

the

maximum

output

levels,

these

levels

not

match,

turn

the

adjustment

screw

until

both

output

levels

match

together

within

1dB.

L-CH

within

1dB

R-CH

peak

Screw

position

Phase

Check

Adjustment

Location

Mode

playback

motor

rear

side

test

tape

variable

resister

P-4-A100

(10kHz,

—

10dB)

oscilloscope

LCH

ATK

LINE

OUT

Screen

pattern

phase

45°

90°

135°

180°

——_-—————”

good

wrong

Set

the

REV

mode

and

repeat

the

step

1-8,

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

Adjustment

screw

LINE

OUT

Adjust

RV101

(L-ch)

and

RV201

(R~ch)

that

the

reading

Tape

Speed

Adjustment

VTVM

meets

the

adjustment

limits

below.

Setting

test

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

Playback

and

Stop

operation

repeated

several

times.

Mode

playback

test

tape

Adjustment

Location:

Main

board

WS-48B

(3kHz,

OdB)

frequency

counter

Set

FWD

playback

mode.

Adjust

motor

rear

side

(variable

resistor)

that

the

frequency

counter

reading

becomes

3,000

15Hz.

Bias

Current

Adjustment

Procedure

LINE

(no

signal)

CS-413

blank

tape

digital

voltmeter

47k

L-CH

Ana

ces

TP301

B+

(+7.5V)

Set

RV103

and

RV203

mechanical

center

and

turn

the

set

recording

mode.

Connect

digital

voltmeter

shown

the

following

table.

38.

Adjust

the

following

transformers

for

the

minimum

readings

the

digital

voltmeter.

Adjustment

Part

and

TP301

T101

not

than

.®

and

©,

TP301

T201

130mV

Adjustment

Location:

Main

board

Record

Bias

Adjustment

Setting

REC

LEVEL

control:

Standard

Record

(See

page

7.)

test

TP801:

short

Procedure

Mode:

record

sine

CS-123

10k

blank

tape

ae)

attenuator

o—o

ooo

eee

LINE

315Hz

10kHz

24.5mV(—

30dBs(m))

Mode:

playback

recorded

portion

Playback

the

signal

recorded

step

Confirm

that

the

10kHz

playback

output

0+0.5dB

relative

the

315Hz

output.

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

TP801:

short

Procedure

Mode:

record

OSC

€)

attenuator

(oe)

VTVM

LINE

OUT

LINE

315Hz,

32.2mV(—

27.7dBs(m))

Mode:

playback

recorded

portion

LINE

OUT

Playback

the

signal

recorded

stepl.

Confirm

that

the

signal

level

within

the

adjustment

limits

below.

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

digital

voltmeter

Adjustment

procedure:

Quick

reverse

adjustment

tape

(Leader

the

‘

nee

black

cassette

tape)

TP802

Connect

the

digital

voltmeter

test

point

TP802.

Load

quick

reverse

adjustment

tape

and

play

back

the

leading

portion

FWD

mode.

Adjust

the

RV801

for

4.5+0.5V

reading

the

digital

voltmeter.

Play

back

quick

reverse

adjustment

tape

FWD

mode

again.

Confirm

that

the

reading

the

digital

voltmeter

“L”

level

the

magnetic

portion

the

tape.

Confirm

that

the

tape

stop

around

the

tape

end

(boder

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

Bias

Current

RV801

Quick

Reverse

TP301

Bias

Current

Test

point

RV203

(R-ch)

RV103

Record

Bias

240

SECTION

DIAGRAMS

4-1.

SEMICONDUCTOR

LEAD

LAYOUTS

DTA114ES

RBA402

SEL2210S-C

DTA144ES

DTC114ES

DTC143TS

2SA1175-HFE

tong

short

2SB1116A-L

2SC2603~-

node

—

cathode

28C945-P

28D1020-HFE

aad

peseall

GP2S22B

HZS7AIL

UZL~-7H1

UZL-12M1

eneaaha

CaTuocE

emitter

ANOCE

2SB1370~-EF

28D1312-K

10E2N

21DQ05

4-2.

CIRCUIT

BOARDS

LOCATION

POWER

BOARD

REEL

MOTOR

BOARD

MAIN

BOARD

HEAD

TRANSLATION

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