Table of Contents
Advertisement
Available languages
Available languages
7. Tracking Servo Loop Gain Adjustment
| © Objective
@ Symptom when out of
adjustment
@ Measurement instru-
ment connections
| [Procedure]
To optimize the tracking servo loop gain.
Playback does not start, during searches the actuator is noisy, or tracks are skipped.
See Figure 7.
@ Player state
Test mode, play
[Settings]
CHI
CH2
50 mV/division
50mV/division
wise
YEDS-7
X~- Y mode
@ Adjustment location
| VR1S1 (TRK. GAN)
1. Set the AF generator output to 1.2kHz and 2 Vp-p.
2. Press the MANUAL/TRACK SEARCH FWD P> / DDI or REV IXKI / << key to move the pickup to halfway across
the disc (R=35 mm), then press the PROGRAM key, the PLAY/PAUSE > / 010 key, then the PLAY/PAUSE
/ 00
key in that order to close the corresponding servos and put the player into play mode. (Press the "[>/00" key
twice.)
3. Adjust VR151 (TRK. GAN) so that the Lissajous waveform is symmetrical about the X axis and the Y axis.
Pin 3 (TRK. IN)
Pin 4 (GND)
Pin 2 (TRK. ERR)
39 kQ
Low pass filter
Figure 7
Tracking Gain Adjustment
40
Higher gain
Optimum gain
Lower gain
Advertisement
Table of Contents
