TABLE OF CONTENTSSERVICING NOTES
1. GENERALááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááNOTES ON HANDLING THE OPTICAL PICK-UP4
BLOCK OR BASE UNIT
2. DISASSEMBLYááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá7
The laser diode in the optical pick-up block may suffer electrostatic
3. TEST MODEááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá15break-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
4. MECHANICAL ADJUSTMENTSááááááááááááááááááááááááá18
use the procedure in the printed matter which is included in the
repair parts.
5. ELECTRICAL ADJUSTMENTSThe flexible board is easily damaged and should be handled with
DECK Section ááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááácare.18
CD Section ááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 21
VIDEO Section ááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááNOTES ON LASER DIODE EMISSION CHECK22
6. DIAGRAMSThe laser beam on this model is concentrated so as to be focused
6-1. Block Diagram N BD Section N áááááááááááááááááááááááááááááááááááááon the disc reflective surface by the objective lens in the optical23
6-2. Block Diagram N VIDEO Section N áááááááááááááááááááááááááááááápick-up block. Therefore, when checking the laser diode emis-25
6-3. Block Diagram N MAIN Section N áááááááááááááááááááááááááááááááásion, observe from more than 30 cm away from the objective lens.27
6-4. Circuit Board Location áááááááááááááááááááááááááááááááááááááááááááááááááááááá 29
6-5. Schematic Diagram N BD Section N ááááááááááááááááááááááááááááááLASER DIODE AND FOCUS SEARCH OPERA31TION
6-6. Printed Wiring Board N BD Section N áááááááááááááááááááááááááááCHECK33
6-7. Schematic Diagram N CD MOTOR Section Nááááááááááááááá 35
6-8. Printed Wiring Board N CD MOTOR Section N ááááááááááááCarry out the OS curve check� in OCD section adjustment� and check37
6-9. Schematic Diagram N AUDIO Section N áááááááááááááááááááááááthat the S curve waveforms is output three times.39
6-10.Printed Wiring Board N AUDIO Section N áááááááááááááááááááá 41
6-11.Printed Wiring Board N MAIN Section N ááááááááááááááááááááááNotes on chip component replacement43
6-12.Schematic Diagram N MAIN Section (1/3) N ááááááááááááááááY Never reuse a disconnected chip component.45
6-13.Schematic Diagram N MAIN Section (2/3) N ááááááááááááááááY Notice that the minus side of a tantalum capacitor may be dam-47
6-14.Schematic Diagram N MAIN Section (3/3) N ááááááááááááááááaged by heat.49
6-15.Printed Wiring Board N VIDEO Section N áááááááááááááááááááá 51
6-16.Schematic Diagram N VIDEO Section (1/3) N ááááááááááááááFlexible Circuit Boar53d Repairing
6-17.Schematic Diagram N VIDEO Section (2/3) N ááááááááááááááY Keep the temperature of the soldering iron around 270 uC during55
6-18.Schematic Diagram N VIDEO Section (3/3) N áááááááááááááárepairing. 57
6-19.Schematic Diagram N PANEL Section N áááááááááááááááááááááááY Do not touch the soldering iron on the same conductor of the59
6-20.Printed Wiring Board N PANEL Section N áááááááááááááááááááácircuit board (within 3 times).61
6-21.Schematic Diagram N VIDEO OUT Section N ááááááááááááááY Be careful not to apply force on the conductor when soldering or63
6-22.Printed Wiring Board N VIDEO OUT Section N áááááááááááunsoldering.65
6-23.Schematic Diagram N AMP KEY CONTROL Section N67
6-24.Printed Wiring Board
N AMP/KEY CONTROL Section N ááááááááááááááááááááááááááááááá 69
6-25.Schematic Diagram N POWER Section Náááááááááááááááááááááá 71
6-26.Printed Wiring Board N POWER Section N ááááááááááááááááááá 73
6-27.IC Pin Function Description áááááááááááááááááááááááááááááááááááááááááááááá 74
6-28.IC Block Diagrams áááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 83
7. EXPLODED VIEWSááááááááááááááááááááááááááááááááááááááááááááááááá88
8. ELECTRICAL PARTS LISTáááááááááááááááááááááááááááááááááá97
N 3 N |
ACEC
