Sony wm ex 570 service manual
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Extracted text from sony wm ex 570 service manual (Ocr-read)
Page 1
Ð 2 Ð Flexible Circuit Board Repairing ¥ Keep the temperature of the soldering iron around 270 ûC 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. 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. TABLE OF CONTENTS 1. SERVICING NOTES ............................................... 3 2. GENERAL ................................................................... 5 3. DISASSEMBLY ......................................................... 6 4. MECHANICAL ADJUSTMENTS ....................... 11 5. ELECTRICAL ADJUSTMENTS ......................... 11 6. DIAGRAMS 6-1. Block Diagram ................................................................ 12 6-2. Printed Wiring Board ...................................................... 14 6-3. Schematic Diagram ......................................................... 17 6-4. IC Pin Function Description ........................................... 23 7. EXPLODED VIEWS ................................................ 25 8. ELECTRICAL PARTS LIST ............................... 28 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 PUB- LISHED BY SONY.
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Ð 3 Ð SECTION 1 SERVICING NOTES 1. Setting 1) Refer to Ò3. DISASSEMBLYÓ, and remove the cabinet and open the MAIN board. 2) Connect the MAIN board to the M901 (motor) and PM901 (plunger) using jumper wires. 3) Short the ATS terminals. 4) Press and fixed the S701 (CASSETTE HOLDER). 5) Supply 1.5V to the battery terminals Ô and Õ using a stabi- lized power supply. 2. FF, REW Modes 1) Input a square wave to the TP35 (PHOTO IN) and TP23 (GND). (See figure below) 2) Press the S704 (STOP) for selecting STOP mode. 3) Press the S706 (FF) or S707 (REW). 3. PLAY mode 1) Input a square wave to the TP35 (PHOTO IN) and TP23 (GND). (See figure below) 2) Press the S704 (STOP) for selecting STOP mode. 3) Press the S705 (PLAY). (Each time the switch is pressed, the mode is changed over) This set detects the rotation of GEAR (S) using the PH701 (photo reflector). The PH701 is mounted on the MAIN board, and there- fore the GEAR cannot be detected with the MAIN board removed. As a result, the motor cannot be controlled, causing malfunction. Further, the S702 (FWD/REV switch) is also mounted on the MAIN board, and with the board removed, the mechanism position cannnot be detected and the operation is not changed over. Therefore, when the voltage check is executed with the MAIN board removed, follow the procedure provided below. Note :Do not move the S702 swithc position when removing the MAIN board. If it is moved, the set will not be changed over to the selected mode. In this case, reconnect the MAIN board to the set and retry the work from the beginning. Ñ MAIN BOARD (Side B) Ñ AF oscillator square wave 10 Hz, – 3.5 dB S702 IC701 S705 (PLAY) S704 (STOP) TP23 (GND) FWD ® REV S706 (FF) S707 (REW) RV601 connect to M901 (motor) battery terminalPH701 TP35 PHOTO IN battery terminal ATS terminals (to S901)connect to PM901 (plunger) S701 CASSETTE HOLDER – +