Sony HCD-CP500K, Service Manual, Page: 30 / 94

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HCD-CP500K/CP500MD
2. PRECAUTIONS FOR CHECKING LASER DIODE
EMISSION
To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eye-sight.
3. PRECAUTIONS FOR USE OF OPTICAL PICK-
UP (KMS-260B/260E)
As the laser diode in the optical pick-up is easily damaged by static
electricity, solder the laser tap of the flexible board when using it.
Before disconnecting the connector, desolder first. Before connecting
the connector, be careful not to remove the solder. Also take adequate
measures to prevent damage by static electricity. Handle the flexible
board with care as it breaks easily.
Optical pick-up flexible board
pick-up
flexible board
laser tap
4. PRECAUTIONS FOR ADJUSTMENTS
1. When replacing the following parts, perform the adjustments
and checks with the mark in the order shown in the following
table.
2. Set the MD test mode when performing adjustments.
After completing the adjustments, exit the MD test mode.
Perform the adjustments and checks in “Group Service” of the
MD test mode.
3. Perform the adjustments to be needed in the order shown.
4. Use the following tools and measuring devices.
•
Check Disc (TDYS-1) (Part No. : 4-963-646-01)
• Test Disk (MDW-74/GA-1) (Part No. : 4-229-747-01)
• Laser power meter LPM-8001 (Part No. : J-2501-046-A)
or
MD Laser power meter 8010S (Part No. : J-2501-145-A)*
1
• Oscilloscope (Measure after performing CAL of prove.)
• Digital voltmeter
• Thermometer
• Jig for checking BD board waveform
(Part No. : J-2501-196-A)
5. When observing several signals on the oscilloscope, etc.,
make sure that VC and ground do not connect inside the
oscilloscope.
(VC and ground will become short-circuited.)
6. Using the above jig enables the waveform to be checked without
the need to solder.
(Refer to Servicing Notes on page 8.)
7. As the disc used will affect the adjustment results, make sure
that no dusts nor fingerprints are attached to it.
*
1
Laser power meter
When performing laser power checks and adjustment (electrical
adjustment), use of the new MD laser power meter 8010S (Part
No. J-2501-145-A) instead of the conventional laser power
meter is convenient.
It sharply reduces the time and trouble to set the laser power
meter sensor onto the objective lens of optical pick-up.
Optical
Pick-up
IC101 IC102 IC151 IC190 IC195 D101
Parts to be replaced
Adijustment
7. Initial setting of adjustment value
× × × × ×
8. Recording of Iop information
× × × × ×
9. Temperature compensation
× × × ×
offset adjustment
10. Laser power adjustment
× × × ×
11. Iop NV Save
× × ×
12. Traverse adjustment
× × ×
13. Focus bias adjustment
× × ×
16. Auto gain adjustment
× × ×
6-4. AUTO CHECK
× ×