Pioneer PDR-04 - Manual (Page 67)

PDR-04
6.3.17 WBL Focus 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+3.9ki2).]
[ Settings ] 5 mV/div.
20 pS/div.
____________ DC mode_____
Player state
• Adjustment
location
• Disc
Test mode, play
VR115(WFE. 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 player into play mode.
(3) Press the DISPLAY OFF key to light up the DISPLAY OFF KEY LED.
(4) Adjust VR115 (WFE. OFS) so that the amplitude of waveform at CN104 (TPl), Pin 5 (WBL) is minimum.
Out of adjustment Optimum adjustment
67