Sony CFD zw 755 service manual

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sony CFD zw 755 service manual

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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 PUBLISHED BY SONY. TABLE OF CONTENTS Specifications ........................................................................... 1 1. SERVICING NOTES .................................................... 3 2. GENERAL ....................................................................... 4 3. DISASSEMBLY 3-1. Cabinet (Rear) .......................................................... 6 3-2. Power Board, Back up Board, Battery Board ........... 6 3-3. CD Block ASSY ....................................................... 7 3-4. Control Board ........................................................... 7 3-5. Power Key Board, Mega Bass Board, Preset Board, Volume Board ..................................... 8 3-6. Key Board ................................................................. 8 3-7. Headphone Board ..................................................... 8 3-8. REC SW Board, PB Board ....................................... 9 3-9. Mechanism Deck ...................................................... 9 3-10. Capstan/reel Motor (M301), Belt ........................... 10 3-11. Main Board ............................................................. 10 3-12. CD Board ................................................................. 11 3-13. Optical pick-up Block ............................................. 11 4. ADJUSTMENTS 4-1. Mechanical Adjustments ........................................... 12 4-2. Electrical Adjustments .............................................. 12 5. DIAGRAMS 5-1. Explanation of IC Terminals ..................................... 15 5-2. Block Diagrams ........................................................ 17 5-3. Schematic Diagram (Main Section) ......................... 21 5-4. Printed Wiring Boards (Main Section) ..................... 25 5-5. Printed Wiring Boards (Control Section) ................. 28 5-6. Schematic Diagram (Control Section) ...................... 31 5-7. Printed Wiring Boards (CD Section) ........................ 34 5-8. Schematic Diagram (CD Section) ............................ 37 6. EXPLODED VIEWS 6-1. Rear Cabinet Section ............................................... 44 6-2. Front Cabinet Section .............................................. 45 6-3. CD Section .............................................................. 46 6-4. Tape Mechanism Section-1 (MF-ZW755-117) ....... 47 6-5. Tape Mechanism Section-2 (DECK A) (MF-ZW755-117) ................................................... 48 6-6. Tape Mechanism Section-3 (DECK A) (MF-ZW755-117) ................................................... 49 6-7. Tape Mechanism Section-4 (DECK B) (MF-ZW755-117) ................................................... 50 6-8. Tape Mechanism Section-5 (DECK B) (MF-ZW755-117) ................................................... 51 6-9. Optical pick-up Section (KSM-213CDM) .............. 52 6-10. Speaker Section ....................................................... 53 7. ELECTRICAL PARTS LIST .................................... 54 CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. Power consumption AC 15 W Battery life For CD radio cassette-corder: FM recording Sony R20P: approx. 7.5 h Sony alkaline LR20: approx. 22 h Tape playback Sony R20P: approx. 7 h Sony alkaline LR20: approx. 20 h CD playback Sony R20P: approx. 3 h Sony alkaline LR20: approx. 10 h For memory back-up: approx. 1 year Dimensions Approx. 650 x 265 x 256 mm (w/h/d) (25 5⁄8 x 10 1⁄2 x 10 1⁄8 inches) (incl. projecting parts) Mass Approx. 6.7 kg (14 lb. 12 oz) (incl. batteries) Supplied accessory AC power cord (1) Remote control (1) Design and specifications are subject to change without notice. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electro- static breakdown because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic breakdown 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, observe more than 30 cm away from the objective lens. Flexible Circuit Board Repairing - Keep the temperature of the soldering iron around 270°C 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. 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.

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– 3 – CHUCK PLATE JIG ON REPAIRING On repairing CD section, playing a disc without the CD lid, use Chuck Plate Jig. - Code number of Chuck Plate Jig : X-4918-255-1 SECTION 1 SERVICING NOTES LASER DIODE AND FOCUS SEARCH OPERATION CHECK 1. Turn on POWER button and press CD button to CD position. 2. Open the CD lid. 3. Turn on S901 as following figure. 4. Confirm the laser diode emission while observing the objecting lens. When there is no emission, Auto Power Control circuit or Optical Pick-up is broken. Objective lens moves up and down three for focus search. SAFETY CHECK-OUT After correcting the original service problem, perform the following 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 return to chassis, must not exceed 0.5mA (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. 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 indication is 0.75V, 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) AC voltmeter (0.75V) To Exposed Metal Parts on Set Earth Ground 0.15 µF 1.5kΩ Fig. A. Using an AC voltmeter to check AC leakage. Insert a precision screw driver and push SWITCH (S901)