Sony DXA-H2750 User manual

SERVICE

MANUAL

This

set

the

Amplifier,

cassette

deck

section

FH-E705C,

MHC-2750.

SONY-06187

DXA-H2790

Model

Canadian

Model

AEP

Model

Australian

Model

Tourist

Model

Name

Using

Similar

Mechanism]

TC-H2700/H3700

Tape

Transport

Mechanism

DECK

TCM-190RA13A

Type

DECK

TCM-19ORB22A

SPECIFICATIONS

Amplifier

Section

Continuous

RMS

power

output

US,

CND

model:

watts

ohms

kHz,

THD)

EA,

AUS,

model:

40.

watts

ohms

kHz,

THD)

AEP,

UK,

model:

35.

+35

watts

ohms

kHz,

DIN)

Music

power

output

AEP,

UK,

model:

watts

ohms

kHz,

10%

THD)

Peak

music

power

output

£,

EA,

AUS,

model:

400

watts

inputs

DAT

(phono

jacks):

sensitivity

450

mV,

impedance

kilohms

AEP,

UK,

model:

PHONO

(phono

jacks):

sensitivity

mV,

impedance

kilohms

Except

AEP,

UK,

model:

VIDEO

(phono

jacks):

sensitivity

450

mV,

impedance

kilohms

Outputs

HEADPHONES

(stereo

minijack):

accepts

headphones

ohms

SPEAKERS:

accepts

speakers

ohms

Cassette

Deck

Section

Recording

system

4-track

2-channel

stereo

Frequency

response

(DOLBY

OFF)

—

13,000

(+3

dB),

using

TYPE

cassette

(Sony

HF-S)

—

14,000

(+3

dB),

using

TYPE

cassette

—

15,000

(+3

dB),

using

TYPE

cassette

Wow

and

flutter

0.1%

WRMS

+0.3%

(DIN)

Design

and

specifications

subject

change

without

notice.

STEREO

CASSETTE

DECK

AMPLIFIER

ONY.

DXA-H2750

SAFETY

CHECK-OUT

After

correcting

the

original

service

problem,

perform

the

following

safety

check

before

releasing

the

set

the

customer:

Check

theantenna

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

ail

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-540A.

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

0.75V,

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

0.15

voltmeter

(0.75

Earth

Ground

Fig.

Using

voltmeter

check

leakage.

MODEL

IDENTIFICATION

—

Model

Number

Label

—

SONY

movetno.

pxa-H2750

STEREO

CASSETTE

DECK

AMPLIFIER

WML

model:

AC:

120V

60Hz

105W

CND

model:

AC:

120V

60Hz

115W

AEP

model:

AC:

220-—230V~50/60Hz

model:

AC:

240V~50Hz

EA,

model:

AC:

120/220/230~-240V~50/60Hz

110W

model:

AC:

220—230V~50Hz

AUS

model:

AC:

240V~50Hz

110W

@CND:

Canadian

model

AUS:

Australian

model

eG:

Germany

model

elT:

italian

model

@EA:

Saudi

Arabia

model

e@TR:

Tourist

model

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

CCM-

POSANTS

QUE

PAR

DES

PIECES

SONY

DONT

LES

NUMEROS

SONT

DONNES

DANS

MANUEL

DANS

LES

SUPPLEMENTS

PUBLIES

PAR

SONY.

DXA-H2750

TABLE

CONTENTS

Section

Title

Page

Section

’

Title

Page

GENERAL

DIAGRAMS

j-l.

Part

Identification

.............-..

02.

eee

5-1.

Semiconductor

Lead

Layouts

................660.

5-2.

Ciaucuit

Boards

Location

....................006-

DISASSEMBLY

5-3.

Printed

Wiring

Boards

—Deck

Section—..........

2-1.

Front

Panel

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

cece

eee

eaee

5-4.

Schematic

Diagram

—Deck

Section—

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

2-2.

Control

Board,

Board

.....................05.

5-5.

Schematic

Diagram

—Main

Section—

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

2-3.

Cassette

Lid

Assy

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

cece

eee

centre

eee

5-6.

Printed

Wiring

Boards

—Main

Section—

........

2:4,

Bl0ck®

occ

cen

secvanivdeae

ern

eaienldse

aciiens

5-7.

Printed

Wiring

Boards

—-Panel

Section—

........

2:5..

“Back

Panel:

tee

.cneia

cexiwints

alee

evse

Uieeet

5-8.

Schematic

Diagram

—Panel

Section—

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

2-6.

Power

Transformer

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

cece

scence

eeees

2-7.

Main

Board

............0cc

ccc

cece

ences

EXPLODED

VIEWS

2-8.

Joint

(Upper)

...........

cee

cece

eee

eens

6-1.

Cabinet

Section

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

sche

dep

ane

2-9.

Capstan/Reel

Motor

.............-..

sees

eee

6-2.

Chassis

Section............0ccc

cece

eee

cea

eeeee

2-10.

Head

Base

ASSY...........

sce

eee

eens

6-3.

Cassette

Holder

Section.................

cee eee

6-4.

Mechanism

Deck

Section

.................00005

MECHAINICAL

ADJUSTMENTS

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

6-5.

Mechanism

Deck

Section

..............0:e

sees

ELECTRICAL

ADJUSTMENTS

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

ELECTRICAL

PARTS

LIST

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

ALD

DAL

AED

AP AD

AED MEE AED

AED

AER

ECD»

AED

ALD

AEP

ARES»

RE E>

NEED

AED» AEE:

AED»

AEG

ERED:

AEG»

AED AED

AEE

AGS

AED

ALES

AED

ARORA

SECTION

GENERAL

1-1.

-_PARTS

IDENTIFICATIONS

This

section

extracted

from

instruction

manual.

(1)

HEADPHONES

jack

(stereo

minijack)

[2]

SYSTEM

POWER

switch

and

STANDBY

indicator

The

indicator

remains

lit

long

the

power

cord

connected

wall

outlet.

[3]

DISPLAY

button

[4]

DIRECT

button

and

indicator

(5)

FUNCTION

button

and

function

indicators

@ @

[6]

PRESET

button

VOLUME

control

TOTAL

EFFECT

CONTROL

—/+

buttons

[8]

Cassette

holder

(Deck

EJECT

button

(Deck

8B)

[13]

Tape

operation

buttons

(for

Deck

Stop

button

(>:

Forward

play

button

and

indicator

<]:

Reverse

play

button

and

indicator

p>:

Fast

winding

buttons

PAUSE

[f:

button

and

indicator

REC

button

and

indicator

[12]

DOLBY

(Dolby

Noise

Reduction)

switch

[3]

SYNCHRO

button

@ @

TAPE

DUBBING

buttons

NORMAL

SPEED

button

HIGH

SPEED

button

[is]

DIRECTION

mode

selector

Tape

operation

buttons

(for

Deck

©:

Stop

button

Forward

play

button

and

indicator

<j:

Reverse

play

button

and

indicator

p>:

Fast

winding

buttons

EJECT

button

(Deck

Cassette

holder

(Deck

DXA-H2750

Note

the

disassembly

procedure

the

numerical

order

given.

SECTION

DISASSEMBLY

2-1.

FRONT PANEL

Connector

CN956

N80

}

Connectors

CN953

Connectors

}CN109

CN104

Claws

BVTP

2.6x8

2-2.

CONTROL

BOARD,

BOARD

CN505

BVTT

3X6

Control

board

Knob

(VOL)

assy

2-3.

CASSETTE

LID

ASSY

2-4.

BLOCK

BVTP

2.6X8

DXA-H2750

2-5.

BACK

PANEL

CN952

(US,

Canadian)

BVTP

3X10

BVTP

3x10

Back

panel

BVTP

3x10

2-6.

POWER

TRANSFORMER

Bracket

(heat

sink)

Heat

sink

BVTT

3x6

Power

tranfomer

2-7.

MAIN

BOARD

@TC

main

board

@CN601

CN603

2-8.

JOINT

(UPPER)

BVTP

2.6x8

Joint

(upper)

BVTP

2.6x8

DXA-H2750

2-9.

CAPSTAN/REEL

MOTOR

PTPWH

2x23

fitting

base

Claws

When

installing,

pull

the

belt

and

put

arround

claws.

When

installing,

pull

the

capstan

belt

and

put

arround

claws.

connectors

capstan

motor

ground

plate’

connector

@B2.6x3

Claws

MD-A

board

MD-B

board

reet

motor

belt

(FR)

P2.6X2.8

2-10.

HEAD

BASE

ASSY

Claw

head

basd

assy

torsion

spring

hy:

lever

(pinch

lever

REV)

assy

lever

(pinch

lever

FWD)

assy

—8—

SECTION

MECHANICAL

ADJUSTMENTS

PRECAUTION

Clean

the

following

parts

with

denatured

alcoholmois-

tened

swad:

record/playback

head

erase

head

pinch

roller

rubber

belts

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

Meter

reading

65g

CQ-1020

(0.42

0.90

inch)

Forward

6g*cm

1ee

(0.014

0.0802

inch)

65g

(0.42

0.9002

inch)

Reverse

back

tension

€Q-102RC

(0.014

0.0802

inch)

Forward,

120g

Reverse

€Q-201B

(0.98

1.67

inch)

DXA-H2750

SECTION

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

Perior

electrical

adjustments,

short

the

connector

TP401

(test

mode).

Test

Tape

[Tape

__—Contents

Use

P-4-A100

10kHz,

—10dB

Azimuth

Adjustment

P-4-L300

315Hz,

0dB

Level

Adjustment

WS-48B

3kHz,

0dB

Tape

Speed

Adjustment

Record/Playback

Head

Azimuth

Adjustment

Procedure

Forward

Playback

Mode

test

tape

P-4-A100

(10kHz,

—10dB)

TP201

(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

screw

Peak

position

L-CH

RCH

—

peak

DXA-H2750

Playback

Mode

test

tape

P-4-A100

(10kHz,

—10dB)

L-CH

47kQ

phase

45°

good

Change

the

reverse

playback

mode

and

repeat

the

steps

After

the

adjustment,

lock

the

adjustment

screw

with

suitable

locking

compound.

Adjustment

Location

—record/playback

head—

azimuth

cover

Removing

the

azimuth

cover.

Unlock

the

stoppers

the

azimuth

cover

using

L-shaped

wrench

order

adjust.

Tape

Speed

Adjustment

Procedure

—Forward

Playback

Mode—

test

tape

WS-48B

(3kHz,

0dB)

frequency

counter

TP201

(LINE

OUT)

Perform

high

speed

adjustment

before

normal

speed

adjust-

ment.

(High speed

adjustment)

Turn

the

power

and

put

the

deck

into

the

FWD

mode.

Press

the

HIGH

SPEED

switch.

Adjust

RV72A

(H)

the

deck

that

reading

the

frequency

counter

meets

the

adjustment

value.

Adjust

the

RV72B

(H)

deck

performing

steps

deck

(Norma!

speed

adjustment)

Put

the

set

into

the

FWD

playback

mode.

Press

the

NORMAL

SPEED

switch.

this

time,

adjust

RV71A

(L)

the

deck

and

RV71B

(L)

the

deck

that

reading

the

frequency

counter

meets

the

adjustment

value.

Adjustment

Limits

Frequency

Counter

Reading

6,000

20Hz

3,000

10Hz

Frequency

difference

between

the

beginning

and

the

ead

the

tape

should

within

3%.

Frequency

difference

between

deck

and

deck

the

begin-

ning

the

tape

should

within

1.5%.

Adjustment

Location:

MD-A

Board,

MD-B

Board

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