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TABLE OF CONTENTS
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH
MARK ! 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
PUBLISHED BY SONY.ATTENTION AU COMPOSANT AYANT RAPPORT
ร- LA SรCURITร!
LES COMPOSANTS IDENTIFรS PAR UNE MARQUE ! SUR LES
DIAGRAMMES SCHรMATIQUES ET LA LISTE DES PIรCES SONT
CRITIQUES POUR LA SรCURITร DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIรSES SONY
DONT LES NUMรROS SONT DONNรS DANS CE MANUEL OU
DANS LES SUPPรMENTS PUBLIรS PAR SONY.
SAFETY CHECK-OUT
After correcting the original service problem, perform the
following safety checks 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
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 2V AC range are suitable. (See
Fig. A)
Earth GroundAC
voltmeter
(0.75V) 1.5k-ฆ 0.15ยตF
Fig. A. Using an AC voltmeter to check AC leakage.
To Exposed Metal
Parts on Set
SAFETY CHECK-OUT ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 2
1. GENERAL ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 3
2. DISASSEMBLY
2-1. REMOVAL OF FRONT CABINET ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 4
2-2. DIAL POINTER SETTING ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 4
3. MECHANICAL ADJUSTMENTS ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 5
4. ELECTRICAL ADJUSTMENTS
4-1. TAPE RECODER SECTION ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 5
4-2. RADIO SECTION ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 6
5. DIAGRAMS
5-1. PRINTED WIRING BOARD -TUNER SECTION - ยทยทยทยท 8
5-2. SCHEMATIC DIAGRAM -TUNER SECTION - ยทยทยทยทยทยทยทยทยท 9
5-3. PRINTED WIRING BOARD -AUDIO SECTION - ยทยทยทยท 11
5-4. SCHEMATIC DIAGRAM -AUDIO SECTION - ยทยทยทยทยทยทยทยทยท 13
6. EXPRODED VIEWS
6-1. FRONT CABINET SECTION ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 15
6-2. MECHANISM DECK SECTION (1) ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 16
6-3. MECHANISM DECK SECTION (2) ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 17
7. ELECTRICAL PARTS LIST ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท 18
