Sony ta av 490 service manual

Page 1

TA-AV49

SERVICE MANUAL us Model

Canadian Model
AEP Model
UK Model
E Model

I we scivu'c Iii.iiiii:ils
(irulis schema \

lligili/ml h)

SPECIFICATIONS \x'wwt'rcuscn lCCl11illltl1lIS.lll l1»

AUDIO POWER SPECIFICATIONS 9"
POWER OUTPUT AND TOTAL HARMONIC I Jack . .
DISTORTIONI Input lack type SansltIVIty Impedance
. . PHONO MM Phono 2.0 mV kohrns
With 8 ohm loads both channels driven, NER I 50
from 20 - 29,000 Hz; rated 125 watts per 2%
Channel mm'mum HMS Powel- WIIh no. VIDEO 1,2, 3,4 Phone 150 mV 501(0th
more than (9.9% total harmonic distortion (cm,
from 250 milliwatts to rated output. ups
Other speclllclllnns 78 IHF
Amplitier section Output
Power bandwidth (IHF)
7 Hz - 30 kHz (8 ohms) REC OUT Phone Voltage 150 mv
Harmonic distortion lacks Impedance 470 ohms
Less than 0.9% (at 1 kHz, 8 ohms load. Front SPEAKERS Accepts speakers of 3 _ 16
125W+125W (US, Canadian, E model) or ohms.
EJJJJEHfiEZ 3:6Wast Ge'mw HEADPHONES Stereo 'Accepts low and high
phone impedance
Intermodulatlun (IMJ dlstonlon (60 H211 kHz) lack headphones.

Less than 0.9% at rated output

Frequency response VIDEO 1, 2- - 1 v 7
PHONO: RIAA equalization curve MON'TOF 5 wk W 5 Ohms
TUNER, CO, GRAPHIC E0, TAPE. VIDEO 1, 2, 3,
4: 10 Hz to 70 kHz. 13 63 Tons controls
Residual noise Less than 25 pV (8 ohms, network A)
Damping factor 40 (8 ohms, 1 kHz) Response
BASS 28.5 dB (100 Hz)
Via Mb" TREBLE :10 dB (10 kHz)
Video Input/output
Permissible signal input level -Cnn!inuad on page 2-
1 5 Vp~p

Output signal level

t+0,1Vpplwithth-pinput INTEGRATED STERE"
(measured at MONITOR OUT)

Impedance (output)

AV AMPLIFIER

Page 2

TAAfiNmic anualsinfo

General
System
Power ampllller All-stage direcl~coupled pure
complementary SEPP OCL circuit
Surround ampllller
Semi complementary SEPP circuit
Preempllller NF type tone control
Surround circuit Dlgllal Delay Surround circuit
Operation clrcult malnx type
Overall output US. Canadian. E model:
From 125W 4- 125W,
Surround 40W (20W + 20W)
AEP, UK, West Germany model:
From 75W+ 75W
Surround 25W (125W+125W)
Dolby input sensitivity
500 mV
Peak music power output (E model)
420W
Power requirements
US. Canadian model:
120V AC. 60H:
AEP, West Germany model:
220! AC. 5W60Hz
UK model:
240V AC. SOIEOHZ
E model:
120, 220 or 240V AC adjustable,
50/60 Hz
Power consumption
US model: 230W
Canadian model: 500VA
AEP. West Germany model: 170W
UK model: 400W
E model: 250W
Ac Power outlet US, Canadian. AEP, West Germany. E
model:
3 switched outputs for system, 100 wats
max.
UK model:
1 switched output tor system, 100 watts
max.
DImenslons US, Canadian, UK. E model:
430 x 130 x 355 (WIH/D)mm
(17 x 5Ia x 14 inches)
AEF, West Germany model:
430 X 130 X 360 (W/HID)mm
(17 x 51/. x 14/4inehes)
Weight US. Canadian model:
Approx. 10kg (22Ib 10:)
AEP. UK. West Germany model:
Approx. BJkg (19Ib 202)
E model:
Apprwt. 10.1kg (22th 302)
Accessories supplied
Programmable remote commander
RM-PZDZU)
Sony SUM~3iNS| batteries (2)

Its Free

SAFETY CH ECK-OUT

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 leakage. 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
methods.

I. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. 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 batteryoperated AC volt-
meter. The limit" indication is 0.75 V, 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 2 V AC range are
suitable. (See Fig. A)

Ta Exposed Metal
Part: on Set

0. 15uF

AC
é 1.51!n / voltmeter
(0.75 V}

W

'4? Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

MODEL IDENTIFICATION
-Specification Label-

SONY.

INTEGRATED AV AMPLIFIER

MODEL N0. TA-AV 490

SERIAL N0.
MADE IN JAPAN

US model:

Canadian model:
AEP,West Germany model:
UK model:

E model:

AC 120V 60Hz 230W

ACl2OV 60H: SOOVA

AC 220V ~ 50/60Hz

AC 240V ~ 50/ BOHZ

AC 120/220/240V ~50/60Hz 250W