Pioneer PD-M423 Service-Handbuch - Seite 22

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Pioneer PD-M423 Service-Handbuch
PD-M423, PD-M403
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5. Focus Servo Loop Gain Adjustment
@ Objective
To optimize the focus servo loop gain.
@ Symptom when out of | Playback does not start or focus actuator noisy.
adjustment
[Procedure]
1. Set the AF generator output to 1.2 kHz and 1 Vp-p.
2. Press the TRACK /MANUAL SEARCH FWDPo> .- DP] or REV KK. <ki key to move the pickup to halfway across
the disc (R=35 mm), then press the PGM(PROGRAM) key, the PLAY/PAUSE [> / [ll] key twice in that order to
close the corresponding 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.
Focus Gain Adjustment
Higher gain
Optimum gain
Lower gain
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