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CDJ-500G, CDJ-500
5. Focus Servo Loop Gain Adjustment
*Objective
To optimize the focus servo loop gain.
eSymptom when out of ad- | Playback does not start or focus actuator noisy.
justment
*Measurement
instrument | See figure 4.
Player state
Test mode, play
connections
[Settings]
«Adjustment location
VR152 (FCS. GAN)
CHI
CH2
20mVi/division
SmV/division
| *Disc
YEDS-7
X-Y mode
[Procedure]
1. Set the signal generator output to 1.2kHz and 1 Vp-p.
2. Press the SEARCH FWD B® or << key to move the pickup to halfway across the disc(R=35mm),then press the TRACK
SEARCH FWD PPI key, the PLAY/PAUSE P/Ill key, then the PLAY/PAUSE P>/If key in that order to close the corre-
sponding servos and put the player into play mode.
3. Adjust VR152 (FCS. GAN) so that the Lissajous waveform is symmetrical about the X axis and the Y axis.
Pin 5 (FCS. IN)
Pin 4 (GND)
Figure 4
Focus Gain Adjustment
1-30
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