Sony xr 4954 x service manual

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2 TABLE OF CONTENTS 1. SERVICE NOTE ............................................................. 2 2. GENERAL ........................................................................ 3 3. DISASSEMBLY .............................................................. 13 4. ASSEMBLY OF MECHANISM DECK ................ 14 5. MECHANICAL ADJUSTMENTS ............................ 17 6. ELECTRICAL ADJUSTMENTS 6-1. Test Mode ........................................................................ 17 - Tape Deck Section ........................................................ 17 - Tuner Section ................................................................ 17 7. DIAGRAMS 7-1. Block Diagrams - TUNER/TAPE/MAIN Section ..................................... 18 - DISPLAY/KEY CONTROL/BUS CONTROL/ POWER SUPPLY Section ........................................... 19 7-2. Printed Wiring Board -“ MAIN Board -“ ......................... 21 7-3. Schematic Diagram -“ MAIN Board (1/2) -“ ................... 22 7-4. Schematic Diagram -“ MAIN Board (2/2) -“ ................... 23 7-5. Printed Wiring Boards -“ KEY/SUB Boards -“ .............. 24 7-6. Schematic Diagrams -“ KEY/SUB Boards -“ .................. 25 7-7. IC Block Diagrams ......................................................... 26 7-8. IC Pin Function ............................................................... 27 8. EXPLODED VIEWS ................................................ 32 9. ELECTRICAL PARTS LIST ............................... 35Flexible Circuit Board Repairing - Keep the temperature of the soldering iron around 270 ËšC 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. SECTION 1 SERVICE NOTE SUB board Front panel assembly Please press on the sub board from above when checking it. This assures that the connector does not lose contact.