Sony cdx 3900r

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2 TABLE OF CONTENTS 1. GENERAL Location of controls ................................................................. 3 Getting Started ......................................................................... 3 Setting the clock ...................................................................... 3 CD Player ................................................................................ 3 Radio ....................................................................................... 4 RDS ......................................................................................... 4 Other Functions ....................................................................... 6 Additional Information ............................................................ 7 Connections ............................................................................. 8 2. DISASSEMBLY 2-1. Sub Panel Assy .................................................................. 10 2-2. CD Mechanism Block ....................................................... 10 2-3. Main Board ....................................................................... 11 2-4. Heat Sink ........................................................................... 11 2-5. Chassis (T) Assy ................................................................ 12 2-6. Lever Assy ......................................................................... 12 2-7. Servo Board ....................................................................... 13 2-8. ARM Roller Assy .............................................................. 13 2-9. Chassis (OP) Assy ............................................................. 14 2-10. Optical Pick-up Block ....................................................... 14 3. DIAGRAMS 3-1. IC Pin Descriptions ........................................................... 15 3-2. Block Diagram -“CD Section-“ ........................................... 21 3-3. Block Diagram -“Tuner Section-“ ....................................... 22 3-4. Block Diagram -“Display Section-“ .................................... 23 3-5. Circuit Boards Location .................................................... 23 3-6. Printed Wiring Boards -“CD Mechanism Section-“ ............ 24 3-7. Schematic Diagram -“CD Mechanism Section (1/2)-“ ....... 26 3-8. Schematic Diagram -“CD Mechanism Section (2/2)-“ ....... 27 3-9. Printed Wiring Board -“Main Section-“ .............................. 28 3-10. Schematic Diagram -“Main Section (1/3)-“ ........................ 30 3-11. Schematic Diagram -“Main Section (2/3)-“ ........................ 31 3-12. Schematic Diagram -“Main Section (3/3)-“ ........................ 32 3-13. Schematic Diagram -“Sub (CD) Section-“ .......................... 33 3-14. Printed Wiring Board -“Sub (CD) Section-“ ....................... 34 3-15. Printed Wiring Board -“Key Section-“ ................................ 35 3-16. Schematic Diagram -“Key Section-“ ................................... 36 4. EXPLODED VIEWS 4-1. Chassis Section ................................................................. 40 4-2. Front Panel Section ........................................................... 41 4-3. CD Mechanism Section (1) ............................................... 42 4-4. CD Mechanism Section (2) ............................................... 43 4-5. CD Mechanism Section (3) ............................................... 44 5. ELECTRICAL PARTS LIST ........................................ 45 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 PUBLISHED BY SONY. SERVICE NOTE CAUTION Use of controls or adjustments or performance of proce- dures other than those specified herein may result in haz- ardous radiation exposure. 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. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electrostatic 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 emission, ob- serve from more than 30 cm away from the objective lens.

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3 SECTION 1 GENERAL This section is extracted from instruction manual.