Sony xr c 7220 r service manual

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Ð 2 Ð TABLE OF CONTENTS 1. GENERAL Location of controls ........................................................ 3 Resetting the unit ............................................................ 4 Detaching the front panel ................................................ 4 Setting the clock .............................................................. 4 Labelling the rotary commander ..................................... 4 Using the rotary commander .......................................... 4 Adjusting the sound characteristics ................................ 5 Attenuating the sound ..................................................... 5 Changing the sound and display settings ....................... 5 Installation ....................................................................... 6 Connections ..................................................................... 7 2. DISASSEMBLY ......................................................... 12 3. ASSEMBLY OF MECHANISM DECK ........... 14 4. MECHANICAL ADJUSTMENTS ....................... 17 5. ELECTRICAL ADJUSTMENTS Test Mode ........................................................................ 18 Tape Deck Section .......................................................... 18 Tuner Section .................................................................. 19 6. DIAGRAMS 6-1. Block Diagram Ð TUNER/TAPE Section Ð ................... 23 6-2. Block Diagram Ð MAIN Section Ð ................................. 25 6-3. Block Diagram Ð DISPLAY/KEY CONTROL Section Ð ........................ 27 6-4. Block Diagram Ð BUS CONTROL/POWER SUPPLY Section Ð ........... 29 6-5. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 31 6-6. Printed Wiring Board Ð Main Board (Component Side) Ð ................................ 33 6-7. Printed Wiring Board Ð Main Board (Conductor Side) Ð .................................. 35 6-8. Schematic Diagram Ð Main Board (1/4) Ð ..................... 37 6-9. Schematic Diagram Ð Main Board (2/4) Ð ..................... 39 6-10. Schematic Diagram Ð Main Board (3/4) Ð ..................... 41 6-11. Schematic Diagram Ð Main Board (4/4) Ð ..................... 43 6-12. Printed Wiring Board Ð KEY Board Ð ........................... 45 6-13. Schematic Diagram Ð KEY Board Ð .............................. 47 6-14. Printed Wiring Board Ð SUB/INVERTER Board Ð ........................................... 49 6-15. Schematic Diagram Ð SUB/INVERTER Board Ð .......... 50 6-16. IC Pin Function Description ........................................... 54 7. EXPLODED VIEWS ................................................ 58 8. ELECTRICAL PARTS LIST ............................... 61Flexible 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.