Sony tc we 635 service manual

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Ð 2 Ð 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 Ë LA SƒCURITƒ!! LES COMPOSANTS IDENTIFIƒS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHƒMATIQUES ET LA LISTE DES PIéCES SONT CRITIQUES POUR LA SƒCURITƒ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIéCES SONY DONT LES NUMƒROS SONT DONNƒS DANS CE MANUEL OU DANS LES SUPPLƒMENTS PUBLIƒS PAR SONY. SAFETY CHECK-OUT After correcting the original service problem, perform the follow- ing safety checks 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 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). Leak- age 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 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 pas- sive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A) Fig. A. Using an AC voltmeter to check AC leakage. 0.15 µF To Exposed Metal Parts on Set 1.5k W AC voltmeter (0.75V) Earth Ground

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Ð 3 Ð MODEL IDENTIFICATION ÐBack panelÐ PARTS No. MODEL 3-032-412-0¹US model 3-032-412-1¹CND model 3-032-412-2¹AEP model 3-032-412-3¹UK model 3-032-412-4¹AUS model 3-032-412-5¹SP, MY model 3-032-412-6¹CH model ¥ Abbreviation CND : Canadian model SP : Singapore model MY : Malaysia model AUS : Australian model CH : Chinese model TABLE OF CONTENTS 1. GENERAL .......................................................................... 4 2. DISASSEMBLY 2-1. Case ...................................................................................... 5 2-2. Front Panel Assembly ........................................................... 5 2-3. Cassette Lid Assembly (Deck A/B) ...................................... 6 2-4. Mechanism Deck Assembly (Deck A/B) .............................. 6 2-5. Leaf SW (REC/PB) Board (Deck A/B) ................................ 7 2-6. Pinch Lever (FWD)/(REV) Assembly (Deck A/B) ............... 8 2-7. Flywheel (FWD)/(REV) Assembly (Deck A/B) ................... 8 2-8. Mechanical Block Assembly (Deck A/B) ............................. 9 2-9. Head Relay (REC/PB) Board (Deck A/B) ............................ 9 3. SERVICE MODE ............................................................ 10 4. MECHANICAL ADJUSTMENTS ............................... 11 5. ELECTRICAL ADJUSTMENTS ............................... 11 6. DIAGRAMS 6-1. Circuit Boards Location ...................................................... 15 6-2. Printed Wiring Board Ð Main Section Ð .............................. 17 6-3. Schematic Diagram Ð Main Section Ð (1/4) ........................ 19 6-4. Schematic Diagram Ð Main Section Ð (2/4) ........................ 21 6-5. Schematic Diagram Ð Main Section Ð (3/4) ........................ 23 6-6. Schematic Diagram Ð Main Section Ð (4/4) ........................ 25 6-7. Printed Wiring Board Ð Deck Section Ð .............................. 27 6-8. Schematic Diagram Ð Deck Section Ð ................................ 28 6-9. Schematic Diagram Ð Display Section Ð ............................ 29 6-10. Printed Wiring Board Ð Display Section Ð ....................... 31 6-11. Schematic Diagram Ð Panel Section Ð .............................. 33 6-12. Printed Wiring Board Ð Panel Section Ð ........................... 35 6-13. Schematic Diagram Ð Power Section Ð ............................. 37 6-14. Printed Wiring Board Ð Power Section Ð ......................... 39 6-15. IC Pin Function ................................................................ 41 7. EXPLODED VIEWS 7-1. Case Section ........................................................................ 43 7-2. Chassis Section ................................................................... 44 7-3. Cassette Holder Section ...................................................... 45 7-4. Front Panel Section ............................................................. 46 7-5. Tape Mechanism Section (TCM-230ASR4/HSR4) ............ 47 8. ELECTRICAL PARTS LIST ........................................ 48 Part No.