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7. Tracking servo loop gain adjustment
@ Objective
To optimize the tracking servo loop gain
@ Symptom when out of
Playback does not start, during searches the actuator is noisy, or tracks are skipped.
adjustment
@ Measurement instrument
| See Figure 7.
@ Piayer state
Test mode, play
connections
[Settings]
@ Adjustment location
VR151 (TRK GAN)
CH1
CH2
@ Disc
YEDS-7
50 mV/division
50 mV/division
X-Y mode
[Procedure]
1. Set the AF generator output to 1.2 kHz and 2 Vp-p.
2. Press the MANUAL/TRACK SEARCH FWD b>
/ Bl or REV <éd / ed key to move the pickup to halfway across the disc (R = 35 mm),
then press the PROGRAM key, and do twice the PLAY/PAUSE b> / if key in that order to close the corresponding servos and put the
player into play mode.
. Adjust VR151 (TRK GAN) so that the Lissajous waveform is symmetrical about the X axis and the Y axis.
3 PIN
(TRK IN)
4 PIN
(GND)
2 PIN
(TRK ERR)
Low-pass filter
Figure 7
Tracking Gain Adjustment
Higher gain
Optimum gain
Lower gain
35
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