Sony ta av 650 service manual

Page 1

TA-IIVBSII/AVBSIIG

SERVICE MANUAL us Model

TAvAVG 5 0

E Model

TA~AVSSOG

Photo : TA-AVSSO

TABLE OF CONTENTS

Section Title Page
1_ SERVICING NOTE ............................................................................. 2
2' GENERAL .......................................................................................... 3

3. BLOCK DIAGRAM

3.], Block Diagram .......................................................................... 15
$2 Explanation of IC Terminals --------------------------------------------------- 21
4 ELECTRICAL ADJUSTMENTS ........................................................ 24

5. DIAGRAMS
51, IC Block Diagrams -----

52, Circuit Boards Location~

5-3I Printed Wiring Boards ~Audio Section-

5-4. Schematic Diagram -Audio Section-v

5-5. Schematic Diagram -AMP Section- ---- -
5-6. Printed Wiring Boards -AMP Section- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 43

6. EXPLODED VIEWS
61, Front Panel and Cabinet Section"
6-2, Chassis Section~

7 ELECTRICAL PARTS LIST .............................................................. 51

INTEGRATED STEREfl AV AMPLIFIER
SONY;

Page 2

TA-AV650/AV6506

SECTION 1
SERVICING NOTE

Adjusting the Operating Voltage(E Model)

0 When using in an area where the voltage is 240V.
When using a set designated for the E region (220V
specifications) in an area where the voltage is 240V.
reconnect the connector connected to CNV903 to CNV904,

[AC BOARD] COMPONENT SIDE

T8901

220v Cstoa
240v m CNV904

RY901

T901

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL T0 SAFE
OPERATIONi REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

SAFETY CHECK-OUT (US Model)

After correcting the original sennce 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

l. 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 battery-operated AC volt-
meter. 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 3 2V AC range are
suitable. (See Fig. A)

To Exposed Metal
Part: on Set

AC
0.15m: §Ifikfl / voltmeter
(0.7514

"-F Earth Ground

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