Pioneer PDR-04 - Manual (Page 66)

PDR-04
6.3.16 Fine WBL Offset Adjustment Adjustment 2
> Objective
> Symptom when out
of adjustment
To adjust the gain balance of the wobble signal.
Player does not record or search or pause CD-R discs.
• Measurement instru­
ment connections
Connect the oscilloscope to
CN104(TP1), Pin 5 (WBL).
[ This connection must be via a
high-pass filter (180pF+3.9k£2).]
[ Settings ]
5 mV/div.
20 pS/div.
_________ DC mode_____
• Piayer state
> Adjustment
location
> Disc
Test mode, play
VR108 (WBL. OFS)
(HEAD BOARD assy)
STD-R03
[Procedure]
(1) Move the pickup to midway across the disc (R = 35mm) with the MANUAL / TRACK SEARCH FWD ►► or REV
keys.
(2) Press the FINALIZE key, the PLAY ► key, then the PAUSE
II
key in that order to close the respective servos and put
the piayer into play mode.
(3) Adjust VRI08 (WBL. OFS) so that the amplitude of waveform at CN104 (TP1), Pin 5 (WBL) is minimum.
•vw»wi4j(w«vw.v
Out of adjustment Optimum adjustment
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