Sony TA-V925NE User manual

SERVICEMANUAL

This set is the Stereo

amplifiersection in

LBT-V925CD

AEP Model

UK Model

SPECIFICATIONS

Poweramplifler

Poweroutput 85W + 85Wat5 %distortion

Power

consumption 150W

ACoutlets

Dimensions

Weight

2 unswitched.

200

W max.

355x 132

X 335

(w/h/d)

(14

X 5rl5X 13rlcinches)

Approx.6.7

(14lb13oz)

General

Power

requirements240

VAC,50

Designand

specifications

subject

tochange

without

notice.

STEREO

POtllER

AMPLITIER

SONY.

Title Page

I. GENERAL

1-1.Functionof Controls......i.........'.......'.".."."'.."

4. DIAGRAMS

4-1.

Circuit Boards Location ....".."..".5

4-2.

Semiconductors

Lead Layout...........'......'.....'..'

4-3.Printed

'ffiring Boards ......'...'....'.7

44. Schematic

Diagram....... ......'.......

MODELIDENTIFICATION

- Specification Labet -

AEP,ltalian Model

: AC:22OY-50,/60H2 150W

UK Model:

AC: 240V-50,/60H2 150W

TABLEOF CONTENTS

Description

M0DELN0.

TA-V925NE

STEREO

AMPLIFIER

SAFETY.RELATEDCOMPONENTWARNINGII

coMPoNENTS

|DÊNTTFTEDBY MARK 2[ On OOrreO

L|NE W|THMARK l\ ONTHESCHEMATTC

DTAGRAMS

AND IN THE PARTS LIST ARE CR]TICALTO SAFE

OPERATION. REPLACETHESECOMPONENTS

WITH

SONY PARTS WHOSE PART NUMBERSAPPEAR AS

SHOWN

IN THISMANUAL OR IN SUPPLEMENTS

PUB.

LISHEDBY SONY.

-2-

sEcTtoN

GENERAL

Parts ldentification

Power amplifier

iUl powER

swtrch

El peax

powEn

METER

EJ ueren RANGE

setecror

[S'lopenlnoN Indtcaror

lEl speerenssetector

lEl XeaopXONESlack

(srereo

phone

jack)

Note : Follow the disassemblY

order given.

TFRONT

PANEL]

(DC Bias Adjustment)

Perform this adjustment when

or ICs of the Power amPlifier.

Setup

. No signal (No load)

. Minimum volume

Procedure

1. Connect DC volt meter to

2. Turn on the Power and wait

RT101 (L-CH) and RTlSl

voltage becomes

7mV.

Adjusument Location :

VTVM

(DC

range)

(MA1N

boardl

sEcTloN

DISASSEMBLY

proceduroin the numerical

o BVTP3XS

eKNoB--*âà

e)KNoB

sEcrloN 3

ELECTRICAL

ADJUSTMENTS

replacing

the transistors

the TP.

for 3 minutes,then adjust

(R-CH) so that the bias

/ u*,

@À

Kt l,

F1 \ÈLJ I

\ZJ RT1o1

rpi

SECTION

DIAGRAMS

.Ll. CIRCUIT

BOARDS

LOCATION

SPEAKER

TEAMINAL(B) BOARD

PT TRANSLATION

BOARO

HEADPHONE

JACK

SPSW BOARD

METER

BOARD

POWER

BOARD

SPEAKER

TERMINAL(A) BOARO

SURROUND

JACKEOARO

PINJACKBOARO

TRANSISTOR

R BOARO

TRANSISTOR

L BOARD

MAINBOARD

RELAY

BOARD

METER

SW BOARD METER

SWTRANSLATION

BOARD

LEAD LAYOUT

2SC1

841-PA

/t\

+2. SEMICONDUCTORS

SS1

585

1OEzN

_,::,-:"

':#"",

PC1

237H4

V*-

l-*

30DL4-FC

ï*

PC1

298V

,'m,a

2SA1

348

25C3402

DTAl

14ES

n:r

ffi[

altl

SLR-34UW5

1SS1

lz-ta

F--

SEL241OE-C

'""''ft'"^

a6& cthode

25A1232

2SC301

,'ry'.

2S01585-K

,[{.

. SEMICONDUCTOR

LOCATION +3. PRINTED

WIRINGBOARDS . Refer to page 6 Semiconductor

Lead Layouts.

(TRANSISTOR

L BOARDI (TRANSTS

Ref. No. Location

rc101

tc151

rc201

rc301

tc401

rc451

0102

0103

Ql04

0152

0154

o201

o401

0402

D15l

D152

D201

D202

D204

D210

D301

0302

D303

D304

D305

D306

D402

D404

D405

D406

D407

D408

D409

D41

D411

D412

D413

D414

D41

D452

D454

D455

D456

D457

D458

D459

D460

D461

D462

ts-J

E-7

F-9

E-2

H-

H-20

B-3

B-4

é-z

D-2

B-8

B-6

B-9

r-é

H-18

G-

o-2

E-9

F-9

H-9

t-é

r-8

E-12

*12

I-b

t-7

r-6

t-7

H-18

H-

H-18

r-18

t- 18

G-

H-19

G-

H-19

H-

H-19

r-19

Note

. O-: parts exlracted

from the componenl

side'

Jueren

I TRANSLATION

I BOARD

-7-

15 16 17 18 19 20 22

SPEAKER

TERMINAL

(B)

BOARD

__ -,_.d

IMETER

BOARDI

13 24 25 26 27 28 29 30

SPEAKERTERi,|INAL

(A) BOARD

lsuRRour{D

JAct(

BoARD

JACKBOARD

IPOWER

BOARDI

lIÂ

oFF 0ll

lïorrERl

- t0

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