Sony ta av 490 service manual 2

Page 1

TA-AV49

SERVICE MANUAL us Model

Canadian Model
AEP Model
UK Model
E Model

SPECIFICATIONS

US MODEL

AUDIO POWER SPECIFICATIONS "9"
POWER OUTPUT AND TOTAL HARMONIC Jack 5 ,r r I
DISTORTION' Input lack type ensuwrty mpedance
. , PHONO MM Pho o 2.0 mV 50kohms
With 8 ohm loads both channels dnven, TUNER "
from 20 -' 29,000 Hz; rated 125 watts per CD
channel mln'rflum HMS POWela WIIh "Q VIDEO 1.2.14 Phone 150mV 50kohms
more than 9.9 /0 total harmonic distortion (cm,
from 250 mtlltwatts to rated output. mpg
Other speclllcntions '78 [HF
Ampllller section Output
Power bandwidth (IHF)
7 Hz - 30 kHz (8 ohms) REC OUT Phono Voltage 150 mV
Harmonlc dlstonlon jacks Impedance 470 ohms
Less than (19% (at 1 kHz, 8 ohms load, Front SPEAKERS Accepts speakers 0' a _ 16

125W+125W (US, Canadian. E model) or

ohms.
75W+75W (AEP, UK, West Germany _
model). surround OFF) HEADPHONES Stereo IAccepts low and high
phone impedance
Inlermodulation (IM) distortion (60 Hz : 7 kHz) Jack headphones.

Less than 03% at rated output

Frequency response VIDEO 12' 1v . 7
PHONO: RIAA equalization curve MON'TOR 5 la 9 p' 5 Ohms
TUNER. CO, GRAPHIC EO. TAPE, VIDEO I. 2. 3.
4:10 Hz to 70 kHz, :3 dB Tone controls
Residual noise Less than 25 uV (8 ohms, network A)
Damping Iaclor 40 (5 ohms, 1 kHz) Response
BASS :8!) dB (100 HZ)
W" "W TREBLE :10 dB (10 kHz)
Vldeo Input/output
Permissible signal InpUI level -Continuad on page 2-
1.5 Vp~p
Output signal level
1+0.1Vp-plwithle-prnput INTEGRATED STERE
(measured at MONITOR OUT)
Impedance (output)

50 AV AMPLIFIER
S O N Y;

MICROFILM

Page 2

TA-AV490 I

General SAFETY CHECK'OUT
System
Power ampllller All-stage dlreclcoupled pure
complementary SEPP OCL clrcull After correcting the original service problem.

Surround ampllller

Semicomplernentary SEPPcircult perform the following safety check before releasing

Preamplifier NF type tone control the set to the customer:
s""°"d "3" 0'9"" 09' 5""°"d WW Check the antenna terminals, metal trim. metallized
Overalloutput ng'égzlfitgmgxgwm knobs, screws, and all other exposed metal parts for
From 125w+125w. AC leakage. Check leakage as described below.
Surround 40W (20w + 20W) '
AEP, UK, West Germany model: LEAKAGE TEST

Front 75W+ 75W
Surround 25W (125w+ 125W)

The AC leakage from any exposed metal part to
Dolby lnpul sensitivity

earth ground and from all exposed metal parts to any

500 mV
Peak musk: W, 0W (E model) exposed metal part having a return to chassis, inust
420w not exceed 05 mA (500 microampers). Leakage
Power requirements current can be measured by any one of three
US, Canadian model: methods.
120V AC. 60Hz
AEP, West Germany model: i. A commercial leakage tester, such as the
220V AC. 5018on Simpson 229 or RCA WT-S40A, Follow the
UK "10¢: manufacturers' instructions to use these instru-
240v AC. 50l60Hz menu
E model:
120. 220 or 240V AC adjustable, 2. A battery-operated AC milliammeter. The Data
50/60 Hz Precision 245 digital multimeter is suitable for
Power consumptlon this job.
US model: 230W . .
Canadian model: 500W 3 Measuring the voltage drop across a resrstor by
AEP, west Germany model: 170w means of a VOM or battery-operated AC volt-
UK m°d°|1400W meter. The "limit" indication is 0.75 V. so
E model: 2.50, analog meters must have an accurate low-
Ac P°w°muuu USEZanadIan. AEP we Germany. E voltage scale. The Simpson 250 and Sanwa
m 2 .
aawltehod outputstor system. 100 watts _SH-6:3Trd are examples of a passwe VOMlhat
max, IS suitablet Nearly all battery operated digital
UK model: multimeters that have a l V AC range are
I switched output lot system. 100 watts suitable. (See Fig. A)
max.
Olmenslons US, Canadian, UK. E model:
430 x 130 x 355 (WIHID)mm
(17 x 5% x 14 Inches) To Exposed Mm/
AEP, Wen Germany model: Part: on Set
430 x 130 x 360 (WIHID)mm
(17 x 5la x 14I4inches)
Weight US. Canadian model:
Approx. 10kg (221!) 102) '
AEP. UK, West Germany model: AC
Approx. am; (19!!) 201) 0- 751-": g -5*9 voltmeter
E model: [0.75 V]
Approx. 10.1kg (221i: 302)
Accessorles supplled
Programmable remole commander
RM-onztt) __._
Sony sum-30w) balleriele) ' 5" G'°"
Fig. A. Using an AC voltmeter to check AC leakage.

MODEL IDENTIFICATION
-Specification Label-

SONY- MODEL nun-Avon

US model: AC 120V 60Hz 230w
INTEGRATED AV AMPLIFIER Canadian model: AC120V 60Hz 500VA
AEP,West Germany model: AC 220V ~50/60Hz
UK model: AC 240V ~ 50/60Hz
E model: AC 120/220/240V ~50/60H2 250W

SERIAL N0.
MADE IN JAPAN