Sony mdx ca 680x service manual

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2 MDX-CA680/CA680X 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. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT 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. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. The laser diode in the optical pick-up block may suffer electro- static break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down 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 Never look into the laser diode emission from right avove when checking it for adustment. It is feared that you will lose your sight. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK (KMS-241C). The laser diode in the optical pick-up block may suffer electro- static break-down easily. When handling it, perform soldering bridge to the laser-tap on the flexible board. Also perform mea- sures against electrostatic break-down sufficiently before the op- eration. The flexible board is easily damaged and should be handled with care. laser-tap OPTICAL PICK-UP FLEXIBLE BOARD 1. GENERAL Location of Controls ....................................................... 3 Setting the Clock ............................................................. 4 2. DISASSEMBLY 2-1. Disassembly Flow ........................................................... 10 2-2. Sub Panel Assy ................................................................ 10 2-3. Mechanism Deck (MG-164MA-138) ............................. 11 2-4. MAIN Board ................................................................... 11 2-5. Heat Sink ......................................................................... 12 2-6. SERVO Board ................................................................. 12 2-7. MD Cover Assy ............................................................... 13 2-8. Float Block ...................................................................... 13 2-9. Lo Motor Assy (Loading) (M903) .................................. 14 2-10. Lever (LE23) Assy .......................................................... 14 2-11. Holder Assy ..................................................................... 15 2-12. Chucking Arm Assy ........................................................ 15 2-13. Optical Pick-up (KMS-241C) ......................................... 16 2-14. SL Motor Assy (Sled) (M902), SP Motor Assy (Spindle) (M901) ................................... 16 3. ELECTRICAL ADJUSTMENTS Test Mode ........................................................................ 17 MD Section ..................................................................... 17 Tuner Section .................................................................. 17 4. DIAGRAMS ................................................................. 18 4-1. Block Diagram -“ SERVO Section -“ ............................... 23 4-2. Block Diagram -“ TUNER Section -“ .............................. 24 4-3. Block Diagram -“ MAIN Section -“ ................................. 25 4-4. Block Diagram -“ BUS CONTROL/ POWER SUPPLY Section -“ ........................................... 26 4-5. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 27 4-6. Printed Wiring Boards -“ SERVO Section -“ ................... 29 4-7. Schematic Diagram -“ SERVO Section (1/2) -“ ............... 30 4-8. Schematic Diagram -“ SERVO Section (2/2) -“ ............... 31 4-9. Printed Wiring Board -“ MAIN Board -“ ......................... 32 4-10. Schematic Diagram -“ MAIN Board (1/3) -“ ................... 33 4-11. Schematic Diagram -“ MAIN Board (2/3) -“ ................... 34 4-12. Schematic Diagram -“ MAIN Board (3/3) -“ ................... 35 4-13. Printed Wiring Board -“ SUB Board -“ ............................ 36 4-14. Schematic Diagram -“ SUB Board -“ ............................... 37 4-15. Printed Wiring Board -“ KEY Board -“ ............................ 38 4-16. Schematic Diagram -“ KEY Board -“ .............................. 39 4-17. IC Pin Function Description ........................................... 41 5. EXPLODED VIEWS 5-1. General Section ............................................................... 49 5-2. Front Panel Section ......................................................... 50 5-3. Mechanism Deck Section-1 (MG-164MA-138) ............ 51 5-4. Mechanism Deck Section-2 (MG-164MA-138) ............ 52 6. ELECTRICAL PARTS LIST ............................... 53 TABLE OF CONTENTS

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3 MDX-CA680/CA680X SECTION 1 GENERAL This section is extracted from instruction manual. Location of controls Refer to the pages listed for details. : During Playback : During radio reception : During menu mode aVolume control dial 16 bMBP button 22 cZ (eject) button (located on the front side of the unit, behind the front panel) 9 dSOURCE (Power on/Radio/CD/MD) button 8, 9, 11, 13, 14, 16 eDisplay window fReceptor for the card remote commander gMENU button 8, 10, 11, 12, 13, 17, 18, 21 hDISPLAY/PTY *1 (display mode change/ programme type) button 9, 11, 15, 18 iSCROLL button 9 jOPEN button 7, 9 kLIST button 11 14 lD-BASS button 22 mRESET button (located on the front side of the unit, behind the front panel) 7nNumber buttons (3) REP 10 (6) SHUF 10 13, 14, 16, 17 oMODE button 9, 11 13, 14, 16 pSOUND button 20, 22 qAF button *1 15, 17 rTA b u t t o n *1 16, 17 sOFF (Stop/Power off) button *2 7, 9 tENTER button 11 14, 18 8, 10, 11, 12, 13, 17, 18, 21 *2W *1AEP, UK models only arning when installing in a car without an ACC (accessory) position on the ignition switch After turning off the ignition, be sure to press (OFF) on the unit for 2 seconds to turn off the clock display. Otherwise, the clock display does not turn off and this causes battery drain. CD/MD RADIO MENU (AEP, UK models) 1 2 3 4 5 6 AF TA OFF DS MENU LIST SOUND ENTER MBP SOURCE REP SHUF MODE D-“BASS DISC/PRESET SEEK SEEK DISPLA Y O P EN PTY S C R O L L CD/MDRADIO CD/MD RADIO CD/MDRADIO CD/MDRADIOMENU