64
(ELECTRICAL ADJUSTMENT )
All adjustments and checks of the MD disc are performed using the test mode.
1. Temperature Compensation Adjustment
*
In principle, do not perform the temperature compensation adjustment during the normal maintenance or repair work. If the
adjustment value is found out that it is far out of the specification values shown in this service manual, perform the temperature
compensation adjustment under the environment where the ambient temperature can be precisely measured.
• Test Point: Indication on the display
• Jig: Thermometer
• Adjustment procedure
1)
Start up the MD test mode then press the STOP key to display the message “ALL SVoFF”.
2)
Press the DISPLAY key to switch the display to “TEMP=$**”.
3)
Press the PAUSE key to switch the display to “T+**C:+00”.
4)
Place the thermometer near the MD mechanism to measure the room temperature.
5)
Press the B.SKIP and F.SKIP keys until the indication value on the thermometer and the indication value ** on the display are the
same. After the two values are adjusted for the unity value, press the ENTER key to set the value.
6)
Press the STOP key to display the message “ALL SVoFF”.
2. Laser Power Adjustment
• Test Point: Pickup laser output
• Jig: Laser power meter (The meter capable of measuring up to 10 mW)
2-1. Playback Laser Power Adjustment
• Adjustment procedure
1) Press the EDIT key while the message “ALL SVoFF” appears, to change the display to “LA READ”.
2) Press the PAUSE key once to display the “LASER = $**”.
3) Measure the laser output of the pickup unit using a laser power meter. Adjust the laser output value for 0.68±0.003 mW by
pressing the B.SKIP and F.SKIP keys, and press the ENTER key.
4) After the adjustment is complete, press the STOP key to display “ALL SVoFF”.
2-2. Recording Laser Power Adjustment
1) Press the EDIT key three times while the message “ALL SVoFF” appears, to change the display to “LA WRITE”.
2) Press the PAUSE key once to display “LASER=$**”.
3) Measure the laser output of the pickup unit using a laser power meter. Adjust the laser output value for 6.8±0.03 mW by
pressing the B.SKIP and F.SKIP keys. Press the ENTER key.
4) After the adjustment is complete, press the STOP key to display “ALL SVoFF”.
Note:
If the laser output exceeds 7.0 mW, the pickup may be damaged.
3. Auto Sequence Adjustment (EFB/IVR/Focus AGC/Tracking AGC Adjustments)
• Test Point: Indication on the display
• Test Disc: MDW-60, TGYS-1 or equivalent
4) After the adjustment is complete, press the STOP key to display “ALL SVoFF”.
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