Pioneer PD-M601 Service Manual page 30

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 1.2kHz and 1 Vp-p.
2. Press the TRACK / MANUAL SEARCH FWD D> - Dpjor REV I<k]- <<] key to move the pickup to halfway across
Figure 4
Focus Gain Adjustment
Higher gain Optimum gain Lower gain
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