SONY STRSE581
Service Manual

Harmonic distortion Selectivity

0.5% (50 mV/m, 400 kHz) At 10 kHz: 40 dB

TABLE OF CONTENTS 1. GENERAL ································································3 TEST MODE ····························································5 DIAGRAMS
Circuit Boards Location ····················································· 6 Printed Wiring Board � Display Section � ························ 7 Schematic Diagram � Display Section � ··························· 9 Printed Wiring Board � Volume/Video Section �············ 11

General
System Tuner section: PLL quartz-locked digital synthesizer system Preamplifier section: Low-noise NF type equalizer Power amplifier section: Pure-complementary SEPP 120 V AC, 60 Hz 230 W 2 switched, total 120 W/1A Max 17 � 5 7/8 � 11 5/8 inches (430 � 145 � 295 mm) 16 IB 15 oz (7.7 kg) FM wire antenna (1) AM loop antenna (1) Remote controller (remote) (1) Size AA (R6) batteries (2)

2. 3.
3-1. 3-2. 3-3. 3-4.

Power requirements Power consumption AC outlets Dimensions Mass (Approx.) Supplied accessories

3-5. Schematic Diagram � Volume/Video Section � ·············· 13 3-6. Printed Wiring Board � Main Section � ·························· 15 3-7. Schematic Diagram � Main Section (1/3) � ···················· 17 3-8. 3-9. 3-10. 3-11. 3-12. Printed Wiring Board � SP-SW, Power Section � ··········· 19 Schematic Diagram � Main Section (2/3), SP-SW � ······ 21 Schematic Diagram � Main Section (3/3), Power � ········ 23 IC Pin Function ································································ 25 IC Block Diagrams ··························································· 27

Design and specifications are subject to change without notice.

4. 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.

EXPLODED VIEWS

4-1. Front Panel Section ·························································· 29 4-2. Chassis Section ································································· 30

5.

ELECTRICAL PARTS LIST ································ 31

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. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. 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)
To Exposed Metal Parts on Set

2.

3.

0.15 µF

1.5 k�

AC Voltmeter (0.75 V)

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.

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

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