Pioneer PD-M423 Руководство по эксплуатации - Страница 23
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PD-M423, PD-M403
6. 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
@Measurementinstru-
| See Figure S.
@ Player state
Test mode, play
ment connections
50 mV/division
20 mV/division
i
YEDS-7
X-Y
mode
@ Disc
DS
[Procedure]
1. Set the AF generator output to 1.2 kHz and 2 Vp-p.
2. Press the TRACK/MANUAL SEARCH FWD PtP - D>] or REV KK-
<kj key to move the pickup to halfway
across the disc (R=35 mm), then press the PGM(PROGRAM) key, the PLAY/PAUSE [>/ []] key twice in that order
to close the corresponding servos and put the player into play mode.
3. Adjust VR151 (TRK. GAN) so that the Lissajous waveform is symmetrical about the X axis and the Y axis.
(10:1)
BB
0.001 pF
accenceneeenereescanceceeneeres 2
Low pass filter
Tracking Gain Adjustment
Higher gain
Optimum gain
Lower gain
33