Sony ta d 505 service manual

Page 2

TA- D505

SAFETY CHECKOUT TABLE OF CONTENTS

After correcting the original service problem, Section Title Page
perform the following safety check before releasing ___ _ V"
the set to the customer: SECT|0N ]_ GENERAL . . . . . . . . . . . . 3
Check the antenna terminals, metal trim, metallized SECTION 2 DI AGRAMS

knobs, screws, and all other exposed metal parts for

AC leakage. Check leakage as described below. 2-1 10 Pm Functlono . . . . . . 4

2-2. Circuit Boards Location

2-3. Printed Wiring Boards .

2-4. Schematic Diagram
LEAKAGE TEST ~Audio Section- . . . . . . . .13
2-5. Schematic Diagram

0 .
o .
e .
or: C5

The AC leakage from any exposed metal part to , 18
earth ground and from all exposed metal parts to any -Control Sect10n~ . . . . . . '

exposed metal part having a return to chassis, must SECTION 3_ EXPLODED VIEWS
not exceed 0.5 mA (500 microampers). Leakage 3_1 Cabinet Section. . . . . . . 21

current can be measured by any one of three

methods. 3-2. Main Board Section . . . ~ ~ 22
I. A commercial leakage tester. such as the SECTION 4- ELECTRICAL PARTS LIST ' ' ' ° ' 23
Simpson 229 or RCA VII-540A. Follow the
manufacturers instructions to use these instrw
mm o IDENTIFICATION
, . M DEL
2. A batteryoperat-ed AC milltammeter. The Data ~Specification Label~
Precmon 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 0.75 v, so SONY MODEL 0'
analog meters must have an accurate low
voltage scale. The Simpson 250 and Sanwa INTEGRATED STEREO AMPLIFIER
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)
To Euposad Metal
Parr: on Set
AEP, GERMANY, ITALIAN model: AC: 220V~ 50/60Hz
UK model: AC: 240V~ 50/60Hz
E, SAUDI ARABIA,
' AUSTRALIAN model: AC: 120/220/24OV~ 50/60Hz
AC
075; T 1.5m / 736w," SAFETV~RELATED COMPONENT WARNING
--J COMPONENTS IDENTIFIED Bv MARK A on DOTTED
LINE WITH MARK @ ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL To SAFE
_ OPERATION. REPLACE THESE COMPONENTS WITH
? 5" GWw SONY PARTS WHOSE PART NUMBERS APPEAR AS
' SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
Flgi A. Usmg an AC voltmeter to check AC lea/rage. USHED BY SONY.