Sony hcd ex 1

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2 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 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. CAUTIONUse of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. Notes on chip component replacement ¥ Never reuse a disconnected chip component. ¥ Notice that the minus side of a tantalum capacitor may be damaged by heat. Flexible Circuit Board Repairing ¥ Keep the temperature of soldering iron around 270ûC during repairing. ¥ Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). ¥ Be careful not to apply force on the conductor when soldering or unsoldering. Laser component in this product is capable of emitting radiation exceeding the limit for Class 1. This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PROD- UCT MARKING is located on the rear exterior. This caution label is located inside the unit. 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.

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3 NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care. NOTES ON LASER DIODE EMISSION CHECK The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pick- up block. Therefore, when checking the laser diode emission, ob- serve from more than 30 cm away from the objective lens. LASER DIODE AND FOCUS SEARCH OPERATION CHECK Carry out the ÒS curve checkÓ in ÒCD section adjustmentÓ and check that the S curve waveform is output four times. TABLE OF CONTENTS 1. SERVICING NOTE .......................................................... 4 2. GENERAL .......................................................................... 7 3. DISASSEMBLY 3-1. Back Cover and Case ............................................................ 9 3-2. Panel Board and Stabilizer .................................................... 9 3-3. AMP Block ......................................................................... 10 3-4. CD Block ............................................................................ 10 3-5. Motor ASSY and CAM ....................................................... 11 3-6. Base Unit ............................................................................. 11 3-7. Main Board and Power Board ............................................ 12 4. ELECTRICAL ADJUSTMENT ..............................13 5. DIAGRAMS 5-1. Circuit Boards Location ...................................................... 14 5-2. Printed Wiring Board Ð Main Section Ð .............................. 16 5-3. Schematic Diagram Ð Main (1/3) Section Ð ........................ 18 5-4. Schematic Diagram Ð Main (2/3) Section Ð ........................ 19 5-5. Schematic Diagram Ð Main (3/3) Section Ð ........................ 20 5-6. Printed Wiring Board Ð LED/Loading/SW Section Ð ......... 21 5-7. Schematic Diagram Ð LED/Loading/SW Section Section Ð ............................... 21 5-8. Printed Wiring Board Ð AMP Section Ð .............................. 22 5-9. Schematic Diagram Ð AMP Section Ð ................................. 23 5-10. Printed Wiring Board Ð Panel Section Ð ........................... 24 5-11. Schematic Diagram Ð Panel Section Ð ............................. 25 5-12. Printed Wiring Board Ð Power Section Ð ......................... 26 5-13. Printed Wiring Board Ð Power Section Ð ......................... 27 5-14. Printed Wiring Board Ð REG Section Ð ............................ 28 5-15. Schematic Diagram Ð REG Section Ð .............................. 29 5-16. IC Block Diagrams ........................................................... 30 5-17. IC Pin Functions ............................................................... 32 6. EXPLODED VIEWS 6-1. Front and Case Section ....................................................... 36 6-2. Chassis Section ................................................................... 37 6-3. Mechanism Section ............................................................. 38 6-4. Base Unit Section ................................................................ 39 7. ELECTRICAL PARTS LIST................................. 40