Sony ta ax 401 service manual

Page 1

SERVICE MANUAL

US Mode/

SPECIFICATIONS
AUDIO POWER SPECIFICATIONS 0W
POWER OUTPUT AND TOTAL HARMONIC FIECOUT Phono jacks Voltage 150 mV
DISTORTION- Impedance 1 kilohm
With 8 ohm loads both channels driven, 2:32:15 : h :°°e:5f°eak*::f":f:ms-
from 20 - 20,000 Hz; rated 135 watts per ,affim °"e h:§§§,,:,;:_a" '9 """ 3"
channel minimum RMS power, with no
more than 0.9% total harmonic distortion GRAPH EQUALZEgggggfmgMEMO HL 330m
from 250 milliwatts to rated output. 1kHz, 3.3 kHz)
:26dB(10kHz)
Amplifier section
Power bandwidth (IHF) 30 Hz - 30 kHz 18 ohms, 65 watts) General
1.7 dB (78 IHF) System Preamplifier: Low-noise, highgaln equalizer

Dynamic headroom
Harmonic distortion
Frequency response

Less than 0.9% at rated output
PHONO: FllAA equalization curve
TUNER, CD, VIDEO, TAPE: 30 HZ - 30 kHz :3 dB

Damping Iactor 27 (8 ohms, 1 kHz)

Input
Jack SIN (weighting
input jack Sensitivity Impedance network. input
type level)
71 dB
PHONO MM Phono 3.0 mV 50 kilohms 75 dB
(A, 3.0 mV)
LsNER 92 dB
Phone 250 mv 50 kilohms 33 (18
VIDEO (A 250 mVI
TAPE '
78 IHF

amplifier
Power amplifier: Purecomplementary SEPP
00L power amplifier with all stages
directly coupled
Power requirements 120 V AC, 60 Hz
Power consumption 235 W

AC outlets 3 switched, total 100 watts max.

Dimensions Approx. 430 X130x 355 mm (wlh/d)
(17 x 51/: x 14 inches)

Weight Approx. 8.5 kg (18 lb 12 oz)

Supplied accessory RM-SIM Remote commanderfl)

DeSIgn and specifications subject to change without notice

INTEGRATED STEREII AMPLIFIER

SONY.

Page 2

TA-AX40 1

TABLE OF CONTENS

Section Title Page
1. GENERAL
1-1, Location of Controls ...................... 3

2. DISASSEMBLY

2-1. Removal of The Front Panel .................. 4
2-2 Removal of The Q511 ...................... 4
3. ELECTRICAL ADJUSTMENTS ................ 5
4. DIAGRAMS
4-1. Block Diagram .............................. 6
4-2. Circuit Boards Location . . , 9
4-3 Printed Wiring Boards ......... . i 10
4-4. Schematic Diagram -MAIN Section- r r 15
4-5. Schematic Diagram -DISPLAY Section- 19
46. Semiconductor Lead Layouts ................ 22
5. EXPLODED VIEWS
5-1l Case, Front Panel Section .................... 23
5-2. Chassis Section .............................. 24
6. ELECTRICAL PARTS LIST .................. 25

WW

SAFETY-RELATED COMPONENT WARNING
COMPONENTS IDENTIFIED 3V MARK A 0R DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATIONr REPLACE THESE COMPONENTS WITH
SONV PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

SAFETY CHECK-OUT

3, Measuring the voltage drop across a resistor by
means of a VOM or batterycperated AC volt-
meter. The limit" indication is 047SV, 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)

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 leakager 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 0.5 mA (500 microampers), Leakage

current can be measured by any one of three -1
methods.
AC

1, A commercial leakage tester, such as the 0.75}: §I.5kll 7217/5???
Simpson 229 or RCA WT-540Ar Follow the

manufacturers instructions to use these instru-

To Exposed Metal
Parts on Set

ments,
2 A battery-operated AC milliammeter, The Data '7' Earth Ground
Precision 245 digital multimeter is suitable for _
this job Fig, A. Usmg an AC voltmeter to check AC /eakage.