Pioneer PDR-04 - Manual (Page 52)

PDR-04
6.2.3 Coarse Skew Adjustment Adjustment 1
• Objective
• Symptom when out
of adjustment
To coarse adjust the angle of pickup to the disc for perform the grating and DPP
(tracking offset) adjustments correctly.
Sound broken, some discs can be played but not others.
»Measurement instru­
ment connections
Connect the oscilloscope to
CN204(TP201), Pin 1 (RF)
(SERVO UCOM BOARD assy)
[ Settings ] 20 mV/div.
200 nS/div.
AC mode
• Player state
• Adjustment
location
• Disc
Test mode,focus and spindle servos
closed and tracking servo open.
Radial adjustment screw and
tangential adjustment screw
STD-903
[ Procedure ]
(1) Move the pickup to the position where the radial/tangential adjustment screws will be seen with the MANUAL / TRACK
SEARCH FWD ►► or REV ◄◄ keys so that the radial/tangential adjustment screws can be adjusted.
(2) Press the FINALIZE key, then the PLAY ► key in that order to close the focus servo then the spindle servo.
(3) Adjust the RAD (radial direction) and TAN (tangential direction) adjustment screws alternately with hexagonal screwdriver
(1.27 mm diagonal) to maximize the RF output at CN204 (TP201), Pin 1.
Note : Radial direction and tangential direction mean the direction relative to the disc shown in Fig. 2.
0 Hexagonal
screwdriver
Radial direction
Fig. 2
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