Sony cfd v 77 s service manual
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Ñ 2 Ñ TABLE OF CONTENTS 1. SERVICE NOTES ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááá 3 2. GENERAL ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááááááááá 4 3. DISASSEMBLY 3-1. Front Cabinet Assy ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááá 5 3-2. Control Board ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááááááááá 6 3-3. Cabinet (upper) Assy ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááá 6 3-4. Power, Battery, Half Battery, Voltage Selection Board áááááá 7 3-5. Volume, Lcd, Mono st, Main Board ááááááááááááááááááááááááááááááááááá 7 3-6. Mechanism Deck, Optical Pick-up Section áááááááááááááááááááááááá 8 4. DIAL POINTER INSTALLATION ááááááááááááááááááááááááááááááá 9 5. ADJUSTMENT 5-1. Mechanical Adjustment ááááááááááááááááááááááááááááááááááááááááááááááááááá\ á 10 5-2. Electrical Adjustment ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááá 10 5-3. Tuner Section ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááá 11 5-4. Reference ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááááááááááááááááááááá 15 6. DIAGRAMS 6-1. Circuit Board Location ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áá 17 6-2. Block Diagram ááááááááááááááááááááááááááááááááááááááááááááááááááá\ áááááááááááááá 18 6-3. Printed Wiring Board ááááááááááááááááááááááááááááááááááááááááááááááááááá\ ááááá 21 6-4. Schematic Diagram Ð Main Board(1/3) Ð áááááááááááááááááááááááá 25 6-5. Schematic Diagram Ð Main Board(2/3) Ð áááááááááááááááááááááááá 28 6-6. Schematic Diagram Ð Main Board(3/3) Ð áááááááááááááááááááááááá 31 6-7. IC Pin Function Description ááááááááááááááááááááááááááááááááááááááááááááá 33 7. EXPLODED VIEWSááááááááááááááááááááááááááááááááááááááááááááááááá 38 8. ELECTRICAL PARTS LISTááááááááááááááááááááááááááááááááááá 44 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. Battery life For CD radio cassette-corder: FM recording Sony R20P : approx. 3.5 h Sony alkaline LR20 : approx. 10 h Tape playback Sony R20P : approx. 1.5 h Sony alkaline LR20 : approx. 5 h CD playback Sony R20P : approx. 1 h Sony alkaline LR20 : approx. 4 h Dimensions Approx. 420 ´ 165 ´ 256 mm (w/h/d) (16 5/8 ´ 6 1/2 ´ 10 1/8 inches) (incl. projecting parts) Mass (incl. batteries) Approx. 4.2 kg (9 lb. 4 oz) Supplied accessories AC power cord (1) Design and specifications are subject to change without notice. After correcting the original service problem, perform the following 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 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 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 passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A) SAFETY CHECK-OUT To Exposed Metal Parts on Set 0.15 µF 1.5 k ½ AC Voltmeter (0.75 V) Earth Ground Fig. A. Using an AC voltmeter to check AC leakage. 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.
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Ñ 3 Ñ SECTION 1 SERVICE NOTES NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electrostatic 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 from more than 30 cm away from the objective lens. 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 LASER DIODE AND FOCUS SEARCH OPERATION CHECK 1. Press CD open knob. 2. Open the lid for CD. 3. Push on SWITCH (S801) 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 once for the focus search. This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior. The following caution label is located inside the unit. Laser component in this product is capable of emitting radiation exceeding the limit for Class 1. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. Insert a precision screw driver and push SWITCH(S801)