Pioneer PDR-L77 Service Manual page 56

PDR-L77
6.5.4 Focus Bias Adjustment
Test Point
Adjustment Point
Adjustment Value
Symptom when out of
adjustment
[Procedure]
(1) Press the DIGITAL SYNCHRO button in Stop mode.
Note: Make sure the unit is in Stop mode.
(2) Check that "SYNC" appears on the FL display.
(3) Press the AUTO/MANUAL button so that "04 34" appears on the FL display.
(4) Press the FINALIZE button for focus-in.
(5) Press the PLAY button for CAV-servo spindle kick.
(6) Press the PAUSE button to close the tracking servo, then set the unit to Playback mode.
(7) Adjust with the RECORD button and the REC MUTE button until the above adjustment value to be reached is obtained.
Press the SET button to register the adjustment. Once the adjustment is registered with the SET button, "D.VOL" on the FL display lights.
(8) Press the STOP button to stop the unit.
RF
10 : 1
VC
10:1 probe
Note: Adjustment must be done around mid-radius on a disc.
56
CN102 - pin 1 (RF)
RECORD button and REC MUTE button
Adjust until RF jitter is minimal or that the eye pattern of the RF waveform is most open.
Sound broken, record characteristics deteriorate
Jitter Meter
or
Oscilloscope
Test Disc
STD-903