Sony cdx 848 x service manual

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2 CDX-848X SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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. AEP/UK model: When replacing the chassis (U.S) sub assy of mechanism deck which have the CAUTION LABEL attached, please be sure to put a new CAUTION LABEL (3-223-913-11) to the chassis (U.S) sub assy.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. Flexible 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. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. SERVICING NOTES NOTES ON HANDLING THE OPTICAL PICK- UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electro- static 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 emis- sion, observe from more than 30 cm away from the objective lens. US model: If the optical pick-up block is defective, please replace the whole optical pick-up block. Never turn the semi-fixed resistor located at the side of optical pick-up block. DISC MAGAZINE GETTING OUT PROCEDURE ON THE POWER SUPPLY IS OFF Remove the CASE (LOWER T) beforehand 1) Press the lever (ML.S) assy in the direction of arrow A. 2) Removal the magazine assy. Note: Take out the magazine only when the tray is completely within the magazine. If the disk or tray is sticking out, turn on the power and eject the magazine. Lever (ML.S) Magazine assy A OPTICA L PICK-UP BLOCK SEMI-FIXED RESISTOR

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3 CDX-848X TABLE OF CONTENTS SERVICING NOTES .......................................................... 2 1. GENERAL Installation ....................................................................... 5 Connections ..................................................................... 6 2. DISASSEMBLY 2-1. Disassembly Flow ........................................................... 7 2-2. Case (Upper T), Front Panel Assy .................................. 8 2-3. Mechanism Deck (MG-251B-137) ................................. 8 2-4. JACK Board, DIGITAL OUT Board .............................. 9 2-5. MAIN Board, Slide Variable Resistor (Elevator Height Sensor) (RV202) ................................. 9 2-6. ELJ Motor Assy (Elevator) (M104) ................................ 10 2-7. Escutcheon (T) ................................................................ 10 2-8. Chassis (U.S) Sub Assy .................................................. 11 2-9. Chassis Assy .................................................................... 11 2-10. RF Board ......................................................................... 12 2-11. Sled Motor Assy (251) (M101), Optical Pick-up (KSS-720A) .......................................... 12 2-12. LSW Board, Spindle Motor (S) Sub Assy (M102) ........ 13 2-13. ELJ Motor Assy (Chucking) (M103) ............................. 13 3. MECHANISM DECK ASSEMBLY 3-1. Assembly Flow ................................................................ 14 3-2. Optical Pick-up Complete Assy ...................................... 14 3-3. Gear (Lomini)/(Load Cam) Assy .................................... 15 3-4. Operation Check ............................................................. 15 4. MECHANICAL ADJUSTMENT .......................... 16 5. ELECTRICAL CHECK .......................................... 17 6. DIAGRAMS 6-1. Block Diagram -“ SERVO Section -“ .............................. 19 6-2. Block Diagram -“ BUS CONTROL/ POWER SUPPLY Section -“ ........................................... 20 6-3. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 21 6-4. Printed Wiring Boards -“ RF/LSW Boards -“ ................. 22 6-5. Schematic Diagram -“ RF/LSW Boards -“ ...................... 23 6-6. Printed Wiring Boards -“ MAIN Board (Component Side) -“ .............................. 24 6-7. Printed Wiring Boards -“ MAIN (Conductor Side)/SWITCH Boards -“ .............. 25 6-8. Schematic Diagram -“ MAIN Board (1/3) -“ .................. 26 6-9. Schematic Diagram -“ MAIN Board (2/3) -“ .................. 27 6-10. Schematic Diagram -“ MAIN (3/3)/SWITCH Boards -“ ................................. 28 6-11. Printed Wiring Boards -“ JACK/DIGITAL OUT Boards -“ ................................. 29 6-12. Schematic Diagram -“ JACK/DIGITAL OUT Boards -“ .................................. 29 6-13. IC Pin Function Description ........................................... 34 7. EXPLODED VIEWS 7-1. Case Section .................................................................... 37 7-2. Mechanism Deck Section-1 (MG-251B-137) ................ 38 7-3. Mechanism Deck Section-2 (MG-251B-137) ................ 39 7-4. Mechanism Deck Section-3 (MG-251B-137) ................ 40 7-5. Mechanism Deck Section-4 (MG-251B-137) ................ 41 8. ELECTRICAL PARTS LIST ............................... 42 NOTE FOR REPLACING IC201 IC201 on MAIN board for this set has been changed in the mid- way of manufacturing. In a set that the former type of IC201 is mounted, SUB board is connected to MAIN board (conductor side). No service parts are supplied for the former type of IC201 and SUB board. When the former type of IC201 is replaced, remove SUB board and replace the former type of IC201 with the new type. CHECKING QUALITY OF SUB BOARD If the set works normally after SUB board is removed from MAIN board, SUB board has a trouble. IN this case, remove SUB board and replace IC201 now in use with the new type of IC201. -“ MAIN BOARD (Component Side) -“ -“ MAIN BOARD (Conductor Side) -“ New Type MB90473PFV-G-110- BNDE1 Former Type MB90473PFV-G-108- BNDE1 MAIN BOARD IC201 SUB BOARD IC201 Ver 1.1 2001.05 SUB BOARD