Pioneer CDJ-500G Service Manual page 28

CDJ-500G, CDJ-500
3. Pickup Radial / Tangential Tilt Adjustment
*Objective To adjust the angle of the pickup relative to the disc so that the laser beams are shone straight
down into the disc for the best read out of the RF signals.
«Symptom when out of ad- | Sound broken; some discs can be played but not others.
justment
*Measurement instrument | Connect the oscilloscope to | *Player state Test mode, play
connections TP1, Pinl(RF).
eAdjustment location Pickup radial tilt adjustment
[Settings] 20mV/division screw and tangential tilt ad-
200ns/division justment screw
AC mode
8cm disc
(However, those with
approx. 20 min of audio sig-
nal (music).)
[Procedure]
1. Press the SEARCH FWD B® or key to move the pickup to the external circumference of the disc.
Press the TRACK SEARCH FWD PPI key, the PLAY/PAUSE p>/[] key, then the PLAY/PAUSE P>/f key in that order
to close the respective servos and put the player into play mode.
. First, adjust the radial tilt adjustment screw with the hexagon wrench (GGK1002) so that the eye pattern (the diamond
shape at the center of the RF signal) can be seen the most clearly.
. Next, adjust the tangential tilt adjustment screw with the hexagon wrench (GGK1002) so that the eye pattern (the diamond
shape at the center of the RF signal) can be seen the most clearly. (Figure 3).
K The ball-point type hexagonal wrench is used because the disc will get in the way if a normal hexagonal wrench is used.
. Adjust the radial tilt adjustment screw and the tangential tilt adjustment screw again so that the eye pattern can be seen the
most clearly. As necessary, adjust the two screws alternately so that the eye pattern can be seen the most clearly.
. When the adjustment is completed, lock the radial and tangential adjustment screw.
Note: Radial and tangential mean the directions relative to the disc shown in Figure 2.
Hexagon wrench Radial direction
Radial direction
Tangential direction
Tangential
direction
2 O 2;
Disc
Figure 2
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