Manual Adjustment; Preparations; Focus Offset Adjustment; Srfo Offset Adjustment - Pioneer PDR-W839 Service Manual

6.8 SERVO ADJUSTMENT

MANUAL ADJUSTMENT

6.8.1 Preparations

1. Enter the TEST mode.
2. Press the INPUT 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.

6.8.2 Focus Offset Adjustment

Test Point
Adjustment Value
Purpose
Symptom when Out of 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.
CN102
8
FE
10: 1 prove
6
VC

6.8.3 SRFO Offset Adjustment

Test Point
Adjustment Value
Purpose
Symptom when Out of Adjustment
[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
2
RF
10: 1 prove
6
VC
CN102-pin 8 (Focus err)
0 mV ± 30 mV
Optimizing DC offset voltage of focus-error amplifier.
Focus-in does not function, or bad RF wave shape.
Adjustment method
Oscilloscope
CN102-pin 2 (RF)
0 mV ± 30 mV
Optimizing DC offset voltage of RFDC output circuit when recording.
Recording does not function.
Adjustment method
Oscilloscope
PDR-W839
FL Indication
FL Indication
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