Sony hcd ep 707

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2 HCD-EP707 Notes on chip component replacement -Never reuse a disconnected chip component. - Notice that the minus side of a tantalum capacitor may be dam- aged by heat. Flexible Circuit Board Repairing -K eep the temperature of the soldering iron around 270 ËšC dur- ing 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. This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the bottom. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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. Fig. A. Using an AC voltmeter to check AC leakage. 1.5 k -„¦ 0.15 µF AC voltmete r (0.75 V) To Exposed Metal Parts on Set Earth Ground A TTENTION AU COMPOSANT AYANT RAPPORT Ã- LA SÉCURITÉ! LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU D ANS LES SUPPLÉMENTS PUBLIÉS PAR SONY. 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, metallized 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 r eturn 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 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 indica- tion is 0.75 V, so analog meters must have an accurate low- v oltage 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- ab le. (See Fig. A)

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3 HCD-EP707 TABLE OF CONTENTS 1. SERVICING NOTES ................................................ 3 2. GENERAL ................................................................... 5 3. DISASSEMBLY 3-1. Disassembly Flow........................................................... 6 3-2. Side (P anel)..................................................................... 7 3-3. Top Ca binet Section ........................................................ 7 3-4. Tape Mechanism Deck (CRL4349)................................ 8 3-5. Front P anel Section......................................................... 8 3-6. MAIN Board ................................................................... 9 3-7. CD Mechanism Deck (CMCJ-0132).............................. 9 3-8. REGULATOR Board...................................................... 10 3-9. POWER AMP Board....................................................... 10 3-10. Cove r........................................................................\ ....... 11 3-11. Draw er ........................................................................\ ..... 12 3-12. Belt (Gray/Black) ............................................................ 13 3-13. Optical Block .................................................................. 13 4. ELECTRICAL ADJUSTMENTS ......................... 14 5. DIAGRAMS 5-1. Block Diagram -“ TUNER Section -“............................. 16 5-2. Block Diagram -“ TAPE DECK Section -“..................... 17 5-3. Block Diagram -“ MAIN Section -“................................ 18 5-4. Block Diagram -“ DISPLAY/POWER SUPPL Y Section -“...................... 19 5-5. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 20 5-6. Printed Wiring Boards -“ MAIN Section -“.................... 21 5-7. Schematic Diagram -“ MAIN Section (1/2) -“................ 22 5-8. Schematic Diagram -“ MAIN Section (2/2) -“................ 23 5-9. Printed Wiring Boards -“ POWER AMP Section -“ ...... 24 5-10. Schematic Diagram -“ POWER AMP Section -“............ 25 5-11. Printed Wiring Boards -“ DISPLAY Section -“.............. 26 5-12. Schematic Diagram -“ DISPLAY Section -“................... 27 5-13. Printed Wiring Boards -“ REGULATOR Section -“....... 28 5-14. Schematic Diagram -“ REGULATOR Section -“........... 29 5-15. IC Pin Function Description........................................... 31 6. EXPLODED VIEWS 6-1. Panel Section................................................................... 33 6-2. Front P anel Section......................................................... 34 6-3. Top Ca binet Section ........................................................ 35 6-4. Chassis Section ............................................................... 36 6-5. CD Section ...................................................................... 37 7. ELECTRICAL PARTS LIST ............................... 38 NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT T he laser diode in the optical pick-up block may suffer electro- static 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. T he 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 emis- sion, observe from more than 30 cm away from the objective lens. - MODEL IDENTIFICATION -“ Rear View -“ Po wer Voltage Indication AC : 120 V 60 Hz 38 W AC: 230 V - 50/60 Hz 38 W Model US and Canadian models Other models Power Voltage Indication SECTION 1 SERVICING NOTES V er 1.7