Mpp Offset Readjustment - Pioneer PDR-W839 Service Manual

PDR-W839

6.8.8 MPP Offset Readjustment

Test Point
Adjustment Value
Purpose
Symptom when Out of Adjustment
[Procedure]
1. Press the AUTO SPACE key and shift to the MPP Offset Readjustment.
(Press the AUTO SPACE key several times to appear the right indication.)
2. Monitor the TE waveform with VC.
Be careful with monitoring TE waveform instead of MPP waveform in the readjustment !
3. Adjust the JOG key so that TE offset becomes zero.
4. Press the ENTER key to register the adjustment.
CN102
5
TE
10: 1 prove
6
VC
72
CN102-pin 5 (Tracking err)
0 mV ± 50 mV
Optimizing DC offset voltage of tracking-error output circuit.
Playback does not function, incapable of searching, or track skipping.
Adjustment method
Oscilloscope
FL Indication