Sony xm 2000 r service manual
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Extracted text from sony xm 2000 r service manual (Ocr-read)
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Ð 2 Ð TABLE OF CONTENTS 1. SERVICING NOTES ................................................ 3 2. GENERAL ................................................................... 4 3. DISASSEMBLY ......................................................... 8 4. ELECTRICAL ADJUSTMENTS ......................... 9 5. DIAGRAMS 5-1. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 12 5-2. Printed Wiring Board Ð PRE AMP Section Ð ................ 13 5-3. Schematic Diagram Ð PRE AMP Section Ð .................... 15 5-4. Printed Wiring Boards Ð PROTECT Section Ð ............. 17 5-5. Schematic Diagram Ð PROTECT Section Ð .................. 19 5-6. Printed Wiring Boards Ð POWER AMP Section (Component Side) Ð .............. 21 5-7. Printed Wiring Boards Ð POWER AMP Section (Conductor Side) Ð ................ 23 5-8. Schematic Diagram Ð POWER AMP Section Ð ............ 25 6. EXPLODED VIEWS ................................................ 28 7. ELECTRICAL PARTS LIST ............................... 32Notes 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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Ð 3 Ð PROTECTOR This set has protection circuit and indicators. When trouble oc- curs, LED indicates status. Each LED lights up in green during normal operation. The color will change green to flashing red when trouble occurred. SECTION 1 SERVICING NOTES LED OFFSET (D851) OVER CURRENT *1 (D852) THERMAL (D855) Problem ·DC voltages are applied to the SPEAKER OUT terminal (CN812, CN813) ·DC voltages out to the SPEAKER OUT terminal cause the internal cir- cuit troubled ·The SPEAKER OUT terminal is shorted ·The internal output element is troubled ·The temperature rises to unsafe level Solution Turn off the power switch. Make sure the speaker cord and ground lead are securely connect Turn off the power switch. Make sure the SPEAKER OUT terminal are not short-circuited The set heats up abnormally ·Stereo operation: 1 to 8 W ·Bridging operation: 2 to 8 W Make sure to place the set in a ventilated location (The color will return to green when the temperature returns to normal) *1: Does not work in no-signal condition. TEST TONE To check the systemÕs status, activate the built in transmitter then press the [TESTÊTONE] button (S801). If the tone is heard, the set is functioning normally. CANCELLING THE PROTECTOR AT THE SERVICE Note:When check the protector, do not cancel it. In case of a failure in this set, the protection circuit functions to prevent a speaker damage and turn off the power to stop the set working. To make the set work at the service, disconnect the JW81 of the PROTECT board and turn on the power. Be sure to reconnect the JW81, after the completion of service. + + C867 C871 T851JW81 PROTECT OFF (disconnect) – PROTECT Board – (Component Side)