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4-1. 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.
4-2. Precautions for Use of optical pick-up
(KMS-210A)
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 connect-
ing 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
SECTION 4
ELECTRICAL ADJUSTMENTS
4-3. Precautions for Adjustments
1) When replacing the following parts, perform the adjustments and
1. Temperature
2. Laser power
3. Traverse
4. Focus bias
5. Error rate check
2) Set the test mode when performing adjustments.
laser tap
3) Perform the adjustments in the order shown.
4) Use the following tools and measuring devices.
5) When observing several signals on the oscilloscope, etc.,
4-4. Creating MO Continuously Recorded Disc
* This disc is used in focus bias adjustment and error rate check. The
following describes how to create a MO continuous recording disc.
1. Insert a MO disc (blank disc) commercially available.
2. Rotate the SELECTOR knob and display "CREC MODE".
3. Press the YES button and display "CREC IN".
4. Press the YES button again to display "CREC MID".
5. Complete recording within 5 minutes.
6. Press the NO button and stop recording .
7. Press the EJECT button and remove the MO disc.
The above has been how to create a continuous recording data
for the focus bias adjustment and error rate check.
Note :
• Be careful not to apply vibration during continuous recording.
— 14 —
checks with ® in the order shown in the following table.
Optical
Pick-up
IC171
compensation
G
®
offset adjustment
®
G
adjustment
®
®
adjustment
®
®
adjustment
®
®
After completing the adjustments, exit the test mode.
• MD test disc (CD) TDYS-1
• Laser power meter LPM-8001
• Oscilloscope
• Digital voltmeter
• Thermometer
make sure that VC and Ground do not connect inside the
oscilloscope.
(VC and Ground will become short-circuited.)
"CREC (0300)" is displayed for a moment and recording starts.
BD Board
IC101, IC121, IC191
D101
®
®
G
®
G
®
G
®
G
®
(Parts No. 4-963-646-01)
(Parts No. J-2501-046-A)
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