Sony HCD-M333 Service Manual page 38

HCD-M333
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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-262A/262E)
As the laser diode in the optical pick-up is easily damaged by static
electricity, solder the laser tap of the flexible board when handling it.
Before disconnecting the connector, perform soldering bridge to the
laser tap. 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.
pick-up
Optical pick-up flexible board
4. Precautions for Adjustments
1. When replacing the following parts, perform the adjustments
TE
and checks with in the order shown in the following table.
L 13942296513
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)*
• Oscilloscope (Measure after performing CAL of prove.)
• Digital voltmeter
• Thermometer
• Jig for checking BD (MD) board waveform
(Part No. : J-2501-196-A)
Adjustment
7. Initial setting of adjustment value
8. Recording of Iop information
9. Temperature compensation
offset adjustment
10. Laser power adjustment
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11. Iop NV Save
12. Traverse adjustment
.
13. Focus bias adjustment
16. Auto gain adjustment
6-4. AUTO CHECK
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flexible board
laser tap
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Optical
IC101
Pick-up
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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 12)
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.
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Parts to be replaced
IC701 IC201 IC993
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IC195 D101
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