Sony tc rx 470 service manual

Page 2

TC-RX47O

Supplied accessory
Audio connecting cords (2)

Design and specifications subject to change without notice.

TABLE OF CONTENTS

Section M Page
Specifications .................................. 1
Safety Check~out ............................... 2
1. GENERAL

Identification of Front Panel Pans ~~~~~~~~~~~ 3
2. DISASSEMBLY ......................... 4
3. ADJUSTMENTS
3-]. Mechanical Adjustment -------------------- 6
3-2. Electorical Adjustments ~~~~~~~~~~~~~~~~~ 6
4. DIAGRAMS
4-1. Printed Wiring Board
4-2, Schematic Diagram ....................... 13
5. EXPLODED VIEWS ~~~~~~~~~~~~~~~~~~~~ 17
6. ELECTRICAL PARTS LIST ~~~~~~~~~~~~ 21

SAFETY-RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED BY MARK A 0R 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.

SAFETY CHECK-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.

1. A commercial leakage tester, such as the Simpson
229 or RCA WT-540A, Follow the manufacturers
instructions to use these instruments.

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 voltmeter.
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 Z V AC
range are suitable. (See Fig. A)

To Exposed Metal
Parts on Set
F A0,
0.15 u v0 tmeler
1'5 kg (0. 75 V)

'2 Earth Ground

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

ATTENTION AU COMPQSANT AYANT RAPPORT
A LA SECURITE!

Les COMPOSANTS IDENTIFIES PAR uwe MAROUE A
sun Les DIAGRAMMES scmawmoues ET LA LISTE
oes PIECES sour CRITIQUES POUR LA sécunlre
DE Foucnownemem. we REMPLACER ces com-
POSANTS oue PAR DES Pieces SONY DONT Les
NUMenos sour DONNES DANS ce MANUEL ou
DANS Les SUPPLEMENTS PUBLIES PAR soNv.