Sony HCD-EC68P Service Manual - Page 3

TABLE OF CONTENTS 1. SERVICING NOTES 3 2. GENERAL 6 3. DISASSEMBLY 3-1. Disassembly Flow 10 3-2. Side Panel (L)/(R 11 3-3. Panel (Top 11 3-4. MAIN Board 12 3-5. Front Panel Block (EC78P: UK 12 3-6. Front Panel Block (EC68P/EC78P: US, Canadian)........ 13 3-7. Back Panel Block 13 3-8. 3 CD Mechanism Block (EC78P: UK 14 3-9. Base Unit (EC78P: UK 14 3-10. 1 CD Mechanism Block (EC68P/EC78P: US, Canadian 15 3-11. Base Unit (EC68P/EC78P: US, Canadian 15 3-12. Belt (EC68P/EC78P: US, Canadian 16 3-13. Belt (EC78P: UK 16 3-14. OP Base Assy (KSM-213D 17 4. TEST MODE 18 5. ELECTRICAL ADJUSTMENTS 22 6. DIAGRAMS 6-1. Block Diagram - CD SERVO, TUNER Section 25 6-2. Block Diagram - MAIN Section 26 6-3. Printed Wiring Board - CD Board 28 6-4. Schematic Diagram - CD Board 29 6-5. Printed Wiring Boards - MAIN Section 30 6-6. Schematic Diagram - MAIN Section (1/3 31 6-7. Schematic Diagram - MAIN Section (2/3 32 6-8. Schematic Diagram - MAIN Section (3/3 33 6-9. Printed Wiring Board - HI AMP Board (EC78P 34 6-10. Schematic Diagram - HI AMP Board (EC78P 34 6-11. Printed Wiring Board - LOW AMP Board 35 6-12. Schematic Diagram - LOW AMP Board 35 6-13. Printed Wiring Board - PANEL Board 36 6-14. Schematic Diagram - PANEL Board 37 6-15. Printed Wiring Boards - KEY Section 38 6-16. Schematic Diagram - KEY Section 38 6-17. Printed Wiring Board - MOTOR Board (EC68P/EC78P: US, Canadian models 39 6-18. Schematic Diagram - MOTOR Board (EC68P/EC78P: US, Canadian models 39 6-19. Printed Wiring Board - PT Board 40 6-20. Schematic Diagram - PT Board 41 7. EXPLODED VIEWS 7-1. Panel Section 47 7-2. Front Panel Section 48 7-3. Chassis Section 49 7-4. Main Section 50 7-5. 3 CD Mechanism Section (EC78P: UK) (CDM88A-K6BD90-WOD 51 7-6. 1 CD Mechanism Section (Except EC78P: UK) (CDM77B-K6BD90-WOD 52 8. ELECTRICAL PARTS LIST 53 HCD-EC68P/EC78P SECTION 1 SERVICING NOTES NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electrostatic 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 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 pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens. UNLEADED SOLDER Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with the lead free mark due to their particular size) : LEAD FREE MARK Unleaded solder has the following characteristics. • Unleaded solder melts at a temperature about 40 °C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350 °C. Caution: The printed pattern (copper foil) may peel away if the heated tip is applied for too long, so be careful! • Strong viscosity Unleaded solder is more viscou-s (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc. • Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder. RELEASING THE DISC TRAY LOCK The disc tray lock function for the antitheft of an demonstration disc in the store is equipped. Releasing Procedure: 1. Press [I/1] button to turn the power on. 2. Press the [FUNCTION] button to select CD function. 3. While pressing the [x] button, press the [Z] button for more 5 seconds). 4. The message "UNLOCKED" is displayed and the disc tray is unlocked. Note: When "LOCKED" is displayed, the slot lock is not released by turning power on/off with the [I/1] button. 3