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PDR-W839
6.8 SERVO ADJUSTMENT
MANUAL ADJUSTMENT
6.8.1 Preparations
1.
2.
3.
4.
Enter the TEST mode.
Press the INPUT key so that "OPTICAL" appears on the FL display.
Press the ERASE key more than three seconds to initialize it.
Press the SYNCHRO key to perform the average process.
\ "OPTICAL" disappears on the FL display when completed.
6.8.2 Focus Offset Adjustment
Test Point
CN102-pin 8 (Focus err)
Adjustment Value
0 mV ± 30 mV
Purpose
Optimizing DC offset voltage of focus-error amplifier.
Symptom when Out of Adjustment
Focus-in does not function, or bad RF wave shape.
Adjustment method
FL Indication
[Procedure]
1. Monitor the FOCUS ERROR waveform with VC.
2. Adjust the JOG key so that FE offset becomes zero.
3. Press the ENTER key to register the adjustment.
CN102
FE 8
10: 1 prove
Oscilloscope
VC 6
6.8.3 SRFO Offset Adjustment
Test Point
CN102-pin 2 (RF)
Adjustment Value
0 mV ± 30 mV
Purpose
Optimizing DC offset voltage of RFDC output circuit when recording.
Symptom when Out of Adjustment
Recording does not function.
Adjustment method
FL Indication
[Procedure]
1. Press the AUTO SPACE key and shift to the SRFO Offset Adjustment.
2. Monitor the RFDC waveform with VC.
2. Adjust the JOG key so that RFDC offset becomes zero.
3. Press the ENTER key to register the adjustment.
CN102
RF 2
10: 1 prove
Oscilloscope
VC 6
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