Pioneer PDR-04 - Manual (Page 65)

PDR-04
6.3.15 WBL Balance 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+3.9kQ).]
[ Settings ] 5 mV/div.
20 pS/div.
______ pc mode
Player state
• Adjustment
location
Disc
Test mode, play
VR106 (WBL. BALANCE)
(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 ll key in that order to close the respective servos and put
the player into play mode.
(3) Adjust VR106 (WBL. BALANCE) so that the amplitude of waveform at CN104 (TPl), Pin 5 (WBL) is minimum.
Out of adjustment Optimum adjustment
65