Sony sava 700 service manual
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Extracted text from sony sava 700 service manual (Ocr-read)
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2 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 PUB- LISHED BY SONY. TABLE OF CONTENTS 1. SERVICING NOTES ............................................... 3 2. GENERAL ................................................................... 4 3. DISASSEMBLY ......................................................... 5 4. TEST MODE .............................................................. 8 5. DIAGRAMS 5-1. Note for Printed Wiring Boards and Schematic Diagrams ................................................ 11 5-2. Printed Wiring Board Ð Main BoardÐ ........................... 12 5-3. Schematic Diagram Ð Main Board (1/3) Ð .................... 13 5-4. Schematic Diagram Ð Main Board (2/3) Ð .................... 14 5-5. Schematic Diagram Ð Main Board (3/3) Ð .................... 15 5-6. Printed Wiring Boards Ð FILTER/THERMO/REG/ T2/T1/STANDBY/AC-SW Board Ð ............................... 16 5-7. Schematic Diagram Ð FILTER/THERMO/REG/ T2/T1/STANDBY/AC-SW Board Ð ............................... 17 5-8. Printed Wiring Board Ð AMP Board Ð .......................... 18 5-9. Schematic Diagram Ð AMP Board Ð ............................. 19 5-10. Printed Wiring Boards Ð DISPLAY/LED/KEY Board Ð ..................................... 20 5-11. Schematic Diagram Ð DISPLAY/LED/KEY Board Ð ..................................... 21 5-12. IC Pin Function Description ........................................... 24 6. EXPLODED VIEWS ................................................ 26 7. ELECTRICAL PARTS LIST ............................... 30
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3 SECTION 1 SERVICING NOTES MODEL IDENTIFICATION Ð Rear view Ð MODEL PART No. US model 4-217-252-0 EXCEPT US models 4-217-252-2 SAFETY CHECK-OUT After correcting the original service problem, perform the follow- ing safety check before releasing the set to the customer: Check the antenna terminals, metal trim, ÒmetallizedÓ 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 microamperes). 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 manufacturersÕ 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 ÒlimitÓ indica- tion is 0.75 V, so analog meters must have an accurate low- voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex- amples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V AC range are suit- able. (See Fig. A) Fig. A. Using an AC voltmeter to check AC leakage. 1.5 k W 0.15 µF AC voltmeter (0.75 V) To Exposed Metal Parts on Set Earth Ground PART No.