SERVICING NOTESTABLE OF CONTENTS
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT1. GENERAL
FRONT PANEL áááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 5
The laser diode in the optical pick-up block may suffer electrostatic
REAR PANEL ááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 6
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
2. DISASSEMBLYááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá8
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
3. TEST MODEááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá16repair parts.
The flexible board is easily damaged and should be handled with
care.4. MECHANICAL ADJUSTMENTSáááááááááááááááááááááááááááá 18
NOTES ON LASER DIODE EMISSION CHECK5. ELECTRICAL ADJUSTMENTS
Deck Section áááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 21
The laser beam on this model is concentrated so as to be focused onCD Section ááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 25
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, observe
6. DIAGRAMS
from more than 30 cm away from the objective lens.
6-1. Block Diagram CD Section áááááááááááááááááááááááááááááááááááááááááááá 27
Block Diagram Main Section ááááááááááááááááááááááááááááááááááááááááá 29
LASER DIODE AND FOCUS SEARCH OPERATIONBlock Diagram Audio Sectionáááááááááááááááááááááááááááááááááááááááá 31
CHECK6-2. Circuit Boards Location ááááááááááááááááááááááááááááááááááááááááááááááááááá 33
6-3. Printed Wiring Board BD Section áááááááááááááááááááááááááááááááááá 35
Carry out the OS curve check� in OCD section adjustment� and check6-4. Schematic Diagram BD Section áááááááááááááááááááááááááááááááááááá 37
that the S curve waveform is output repeatedly. 6-5. Printed Wiring Board CD Motor Section ááááááááááááááááááááááá 39
6-6. Schematic Diagram CD Motor Section áááááááááááááááááááááááááá 41
6-7. Printed Wiring Board Audio Section áááááááááááááááááááááááááááááá 43
Notes on chip component replacement
6-8. Schematic Diagram Audio Sectionááááááááááááááááááááááááááááááááá 45
? Never reuse a disconnected chip component.
6-9. Printed Wiring Board Leaf SW Section ááááááááááááááááááááááááá 47
? Notice that the minus side of a tantalum capacitor may be damaged
6-10. Schematic Diagram Leaf SW Section áááááááááááááááááááááááááááá 49
by heat.
6-11. Printed Wiring Board Main Section ááááááááááááááááááááááááááááááá 51
6-12. Schematic Diagram Main (1/5) Section ááááááááááááááááááááááááá 53
Flexible Circuit Board Repairing
6-13. Schematic Diagram Main (2/5) Section ááááááááááááááááááááááááá 55
? Keep the temperature of the soldering iron around 270 uC during
6-14. Schematic Diagram Main (3/5) Section ááááááááááááááááááááááááá 57
repairing.
6-15. Schematic Diagram Main (4/5) Section ááááááááááááááááááááááááá 59
? Do not touch the soldering iron on the same conductor of the
6-16. Schematic Diagram Main (5/5) Section ááááááááááááááááááááááááá 61
circuit board (within 3 times).
6-17. Printed Wiring Board Panel Section ááááááááááááááááááááááááááááááá 63
? Be careful not to apply force on the conductor when soldering or
6-18. Schematic Diagram Panel Section ááááááááááááááááááááááááááááááááá 65
unsoldering.
6-19. Printed Wiring Board Surround Amp Section áááááááááááááááá 67
6-20. Schematic Diagram Surround Amp Sectionááááááááááááááááááá 69
6-21. Schematic Diagram Power Section áááááááááááááááááááááááááááááááá 71
6-22. Printed Wiring Board Power Section ááááááááááááááááááááááááááááá 73
6-23. Waveforms áááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 75
6-24. IC Pin Function Description ááááááááááááááááááááááááááááááááááááááááááááá 76
6-25. IC Block Diagrams ááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 84
7. EXPLODED VIEWSááááááááááááááááááááááááááááááááááááááááááááááááááááá86
8. ELECTRICAL PARTS LISTááááááááááááááááááááááááááááááááááááá94
N 4 N |
ACEC
