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PRECAUTION
6-1. Precautions for Checking Laser Diode Emission
To check the emission of the leaser diode during adjustments, never
view directly from the top as this may lose your eye-sight.
view directly from the top as this may lose your eye-sight.
6-2. Precautions for Use of optical pickup (KMS-210A)
As the laser diode in the optical pickup 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 tale ad-
equate measures to prevent damage by static electricity. Handle the
flexible board with care as it breaks easily.
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 tale ad-
equate measures to prevent damage by static electricity. Handle the
flexible board with care as it breaks easily.
Laser tap
Optical pickup flexible board
6-3. Precautions for Adjustments
1) when replacing the following parts, perform the adjustments and
checks with O in the order shown in the following table.
Optical
BD (MD) BOARD
pickup
IC171
D101 IC101,IC121,IC191
1. Temperature
compensation
X
O
O
O
offset adjustment
2. Laser power
O
X
X
O
adjustment
3. Traverse
O
O
X
O
adjustment
4. Focus bias
O
O
X
O
adjustment
5. Error rate check
O
O
X
O
2) Set the test mode when performing adjustments.
After completing the adjustments,exit the test mode.
3) Perform the adjustments in the order shown.
4) Use the following tools and measuring devices.
4) Use the following tools and measuring devices.
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Test disc (CD) TDYS-1
(Parts No. 4-963-646-01)
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Laser power meter LPM-8001
(Parts No. J-2501-046-A)
r
Oscilloscope
r
Digital voltmeter
r
Thermometer
5) When observing several signals on the oscilloscope, etc., make
sure that VC and GND do not connect inside the oscilloscope.
(VC and GND will become short-circuited)
(VC and GND will become short-circuited)
6) Do not move RV105 of the BD (MD) board. When replacing it,
adjust to the mechanical center of the semi-fixed resistor.
6-4. 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 record-
ing disc.
ing disc.
1. Insert a MO disc (blank disc) commercially available.
2. Rotate the JOG dial and display “ CREC MODE”.
3. Press the YES button and display “ CREC IN”.
4. Press the YES button again to display “ CREC MID”.
2. Rotate the JOG dial and display “ CREC MODE”.
3. Press the YES button and display “ CREC IN”.
4. Press the YES button again to display “ CREC MID”.
“ CREC (0300)” is displayed for a moment and recording starts.
5. Complete recording within 5 minutes.
6. Press the NO button and stop recording
7. Press the MD
6. Press the NO button and stop recording
7. Press the MD
§ 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.
focus bias adjustment and error rate check.
Note :
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Be careful not to apply vibration during continuous recording.
SECTION 6
ELECTRICAL ADJUSTMENTS
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