56
PDR-609
6.7 SERVO ADJUSTMENT
6.7.1 Preparations
1. Enter the TEST mode.
2. Press the INPUT SELECTOR key so that "OPTICAL" appears on the FL display.
3. Press the ERASE key more than three seconds to initialize it.
4. Press the SYNCHRO key to perform the average process.
\
"OPTICAL" disappears on the FL display when completed.
MANUAL ADJUSTMENT
[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.
6.7.2 Focus Offset Adjustment
0 mV
±
30 mV
Optimizing DC offset voltage of focus-error amplifier.
Focus-in does not function, or bad RF wave shape.
CN102-pin 8 (Focus err)
Test Point
Adjustment Value
Purpose
Symptom when Out of Adjustment
Adjustment method
FL Indication
CN102
FE
VC
8
6
10: 1 prove
Oscilloscope
[Procedure]
1. Press the AUTO/MANUAL 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.
6.7.3 SRFO Offset Adjustment
0 mV
±
30 mV
CN102-pin 2 (RF)
Test Point
Adjustment Value
Optimizing DC offset voltage of RFDC output circuit when recording.
Recording does not function.
Purpose
Symptom when Out of Adjustment
Adjustment method
FL Indication
CN102
RF
VC
2
6
10: 1 prove
Oscilloscope
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