M-S Mix Ratio Adjustment; Tracking Offset Adjustment - Pioneer pdr-w739 Service Manual

PDR-W739

6.5.2 M-S Mix Ratio Adjustment

Test Point
Adjustment Point
Adjustment Value
Symptom when out of
adjustment
[Procedure]
(1) Press the AUTO SPACE button so that "CDR f2fff3∗∗" appears on the FL display.
(2) Press the FINALIZE button for focus-in.
(3) Press the PLAY/PAUSE 6 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 REC LEVEL knob until the value to be reached is obtained.
(5) Press the REC LEVEL knob to register the adjustment.
Once the adjustment is registered with the REC LEVEL knob, " ERASE " on the FL display will disappear.
(6) Press the STOP button to stop the unit.
Note: For adjustment, use the following circuits.
39kΩ
TE
0.001µF
39kΩ
MPP
VC
0.001µF
Note: Adjustment must be done around mid-radius on a disc.

6.5.3 Tracking Offset Adjustment

Test Point
Adjustment Point
Adjustment Value
[Procedure]
(1) Press the AUTO SPACE button so that "CDR 03fff6∗∗" appears on the FL display.
(2) Adjust with the REC LEVEL knob until the above adjustment value to be reached is obtained.
(3) Press the REC LEVEL knob to register the adjustment.
Once the adjustment is registered with the REC LEVEL knob, " ERASE " on the FL display will disappear.
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 6.5.2 above attached.
68
CN102 - pin 4 (TE) and pin 3 (MPP)
REC LEVEL knob
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
CN102 - pin 4 (TE)
REC LEVEL knob
0 mV ± 10 mV
Oscilloscope