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9-3. Checking the All Servo ON
1) When the ENTER button is pressed in the “FCS ON!” state, the tracking sled servo is turned on and all servos run. If the
servos are all normal, “SV ON” is displayed.
2) After checking, press the STOP button to return the display to “SV OFF”.
ELECTRIC ADJUSTMENT
All the MD blocks are adjusted and checked in the test mode.
1. Temperature Compensation Adjustment
*
Normally, do not perform the temperature compensation adjustment.
If it needs to be performed, follow the procedure given below in a suitable environment for measuring the correct temperature near the
unit.
• Test point: Check the test point on the display.
• Tool: Thermometer (Celsius)
Adjustment procedure:
1) After the MD test mode starts up, press the STOP button to display “SV OFF”.
2) Press the DISPLAY button to display “T = $**”.
3) Press the PAUSE button to display “T + **C + **”.
4) Put the thermometer near the MD mechanism to measure the room temperature (Celsius).
5) The values of +## are changed by pressing the B.SKIP button and F.SKIP button. Adjust the value **C±## (Celsius) until
the value is the same as the thermometer reading. Press the ENTER button to store the value.
6) After adjustment, press the STOP button to return the display to “SV OFF”.
2. Laser Power Adjustment
• Test point: Pickup laser output
• Tool: Laser power meter (meters that can measure up to 10 mW)
2-1. Playback Laser Power Adjustment
• Adjustment procedure
1) Press the MD REC/EDIT button in the “SV OFF” state to change the display to “L READ”.
2) Press the PAUSE button once to display “L = $**”.
3) Measure the pickup laser output using the laser power meter and adjust it using the B.SKIP button and F.SKIP button so that
it is around 0.68 mW. Then, press the ENTER button. (default setting L = $09)
4) After adjustment, press the STOP button to change the display to “SV OFF”.
2-2. Record Laser Power Adjustment
1) Press the EDIT button three times in the “SV OFF” state to change the display to “L WRITE”.
2) Press the PAUSE button once to display “L = $**”.
3) Measure the pickup laser output using the laser power meter and adjust it using the B.SKIP button and F.SKIP button so that
it is around 6.8±0.03 mW. Then, press the ENTER button. (default setting L = $4A)
4) After adjustment, press the STOP button to return the display to “SV OFF”.
Note:
If the laser power exceeds 7.0 mW, the pickup may be damaged.
3. Automatic Sequence Adjustment (EFB/IVR/FOCUS AGC/TRACKING AGC adjustment)
• Test point: Check the test point on the display.
• Test disk: MDW-74 (MDW-60), TGYS-1 or equivalent
3-1. Adjusting the MO Disk
• Adjustment procedure
1) Insert the MDW-74.
2) Press the MD MODE button to display “SEL GRV”.
3) Press the BAND button to display “AUTO ADJ” and start the adjustment. After adjustment, “Complete” is displayed.
(If the adjustment failed, “FAILED” appears.)
4) Then, press the STOP button to return the display to “SV OFF”.
5) Proceed to 3-2 for checking.
