Pioneer PDR-L77 Service Manual page 55

6.5.2 M-S Mix Ratio Adjustment
Test Point CN102 - pin 4 (TE) and pin 3 (MPP)
Adjustment Point
Adjustment Value
Symptom when out of
adjustment
[Procedure]
(1) Press the AUTO/MANUAL button so that "02 F3" appears on the FL display.
(2) Press the FINALIZE button for focus-in.
(3) Press the PLAY button for CAV-servo spindle kick (the status where the spindle rotates with the focus servo on and tracking servo off).
(4) Adjust with the RECORD button and the REC MUTE button until the value to be reached is obtained.
(5) Press the SET button to register the adjustment.
Once the adjustment is registered with the SET knob, "D.VOL" on the FL display lights.
(6) Press the STOP button to stop the unit.
Note: For adjustment, use the following circuits.
39k
TE
0.001 F
39k
MPP
VC
0.001 F
Note: Adjustment must be done around mid-radius on a disc.
6.5.3 Tracking Offset Adjustment
Test Point CN102 - pin 4 (TE)
Adjustment Point
Adjustment Value
[Procedure]
(1) Press the AUTO/MANUAL button so that "03 F6" appears on the FL display.
(2) Adjust with the RECORD button and the REC MUTE button until the above adjustment value to be reached is obtained.
(3) Press the SET button to register the adjustment.
Once the adjustment is registered with the SET button, "D.VOL" on the FL display lights.
TE
10 : 1
VC
10:1 probe
Note: Perform the adjustment in Stop mode.
This adjustment is possible with the low-pass filter used in adjustment 5 above attached.
RECORD button and REC MUTE button
Adjust until the value of the output signals from pin 4 (TE) and pin 3 (MPP) of CN102 are the same,
or the differential output of these signals is minimal.
Sound broken, record characteristics deteriorate
CH1
10 : 1
Oscilloscope
CH2
10 : 1
10:1 probe
RECORD button and REC MUTE button
0 mV 10 mV
Oscilloscope
PDR-L77
Test Disc
STD-903
55