Sony ta ax 295 service manual

Page 1

This set is the amplifier Section in
SEN-290 (CND, E)/SEN-390 (US).

US Model
Canadian Model
E Model

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTOFITION:
With 8 ohm loads both channels driven, from 20-20000 H_z;
rated 105 watts per channel minimum HMS power, with no
more than 0.9% total harmonic distortion from 250
milliwatts to rated output.

Amplifier section

inputs
Sensitivity Impedance
PHONO , 3.0 mV 50 kilohms
TUNERICDI -
VIDEOII'APE 250 NW 50 kliohms
Output REC OUT: Voltage 150 mV, Impedance 1 kohms

SPEAKER: Accepts speaker of 3 to 16 ohms
HEADPHONES: Acepts headphones with low and
high impedance
Frequency response PHONO: RIAA curve
TUNER/CDNIDEO/TAPE: 30 Hz -- 30 kHz:3 dB
GRAPHIC EQUALIZEFI controls
Boost/cut range:
:8 dB (100 HZ, 330 Hz, 1 kHz, 3.3 kHz)

:6 dB (10 kHz)

Dimensions Approx. 430 x 130 x 355 mm (wlhld)
(17 x 5']: x14lnches)

Weight Approx. 8.5 kg (18 lb 12 02)

General

Power requirements 120 V AC. 60 Hz (US. Canadian)
120/220/240 V AC, 50/50 Hz (E)
AC outlet 1 switched, 100 W max.

Design and specifications subject to change Without notice.

INTEGRATED STEREO AMPLIFIER

ONY;

Page 2

TA-AX295

TABLE OF CONTENTS

Section Title Page
1. GENERAL

1-1. Location of controls ............................ 3
2. DISASSEMBLY

2-1. Panel Assy, Front ............................... 4
2-2. Removal of The Q511 .......................... 4
3. ELECTRICAL ADJUSTMENT .................... 5
4. DIAGRAMS

4-1. Block Diagram .................................. 6
4-2. Circuit Boards Location .......................... 9
4-3, Printed Wiring Boards ............................ 10
4-4. Schematic Diagram ....... .15
46. Semiconductor Lead Layouts I .

5. EXPLODED VIEWS

5-1l Case, Front Panel Section ........................ 20
5-2. Chessis Section .................................. 21
6. ELECTRICAL PARTS LIST ...................... 22

SAFETY-RELATED COMPONENT WARNINGI!

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.

MODEL IDENTIFICATION
-Model Number Label-

SONYZ MODEL Not TA-AX295

INTEGRATED STEREO AMPLIFIER

m

AC 120V 60Hz {Us model:

SONX. MODEL N0. TA»AX29_5_

INTEGRATED STEREO AMPLIFIER
AC 120/220/240VN50/60Hz 200W

E

ATTENTION AUCOMPO'SANT AYANT RAPPORT
A LA SECURITEI

LES COMPOSANTS IDENTIPIés PAR UNE MAROUE A
sun LES DIAGRAMMES scHEMATmUEs ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES com-
POSANTS QUE PAR DES PIECES sonv DONT LEs
NUMERos SONT DONNEs DANs CE MANUEL ou
DANs LEs SUPPLEMENTS PUBLIEs PAR soNv.

SAFETY CH ECK-OUT

After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:

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 0.5 mA (500 microampers). Leakage
current can be measured by any one of three
methods,

I. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540Al 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-
meterl The limit indication is 0.75V, 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 Exposed Metal
Parts on 39!

ea
0.15;: Elam /

'._l

'_- Earth Ground

A C
voltmeter
{0.75 V}

F lg. A. Using an AC voltmeter to check AC leakage.

200W

Canadian model: 425VA