Pioneer PDR-04 - Manual (Page 60)

PDR-04
6.3.6 Coarse WBL Offset Adjustment Adjustment 2
• Objective To optimize the DC offset voltage of the wobble amp.
• Symptom when out Player does not record or playback CD-R discs.
of adjustment
• Measurement instru- Connect the oscilloscope to • Player state Test mode, stop
ment connections CN104(TP1), Pin 5 (WBL).
(HEAD BOARD assy)
[ Settings ] 1 mV/div.
• Adjustment VRI 08 (WBL. OFS)
5 mS/div.
location
(HEAD BOARD assy)
DC mode
• Disc None needed
[ Procedure ]
(T) Adjust VRI08 (WBL. OFS) so that the DC voltage at Pin 5 (WBL) of CN104 (TP1) becomes 0 ± 10mV.
6.3.7 Playback Power Re-adjustment
Adjustment 2
Adjust in the same manner as “1. Playback Power Adjustment ” in Adjustment 1.
6.3.8 Coarse Focus Offset Adjustment Adjustment 2
• Objective
• Symptom when out
of adjustment
To optimize the DC offset voltage of the focus error amp.
The player does not focus in add the RF signal is dirty.
• Measurement instru­
ment connections
Connect the oscilloscope to
CN204(TP201), Pin 1 (RF).
(SERVO UCOM BOARD assy)
[ Settings ] 20 mV/div.
2 mS/div.
DC mode
• Player state
• Adjustment
location
• Disc
Test mode, focus and spindle servos
closed and tracking servo open.
VR105 (FE. OFS)
(HEAD BOARD assy)
STD-903
[ Procedure ]
(1 ) Press the FINALIZE key, then the PLAY ► key in that order to close the focus servo then the spindle servo.
(2) Adjust VR105 (FE. OFS) so that the amplitude of RF signal at CN204 (TP201 ), Pin 1 (RF) is maximum.
Out of adjustment Optimum adjustment
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