Pioneer PD-S703 Manual de serviço - Página 14

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Pioneer PD-S703 Manual de serviço
PD-S703
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 FWD [>> Dl or REV KX] <K1 key to move the pickup to halfway
across the disc (R=35 mm), then press the OUTPUT SELECTOR
key, the PLAY [> key, then the PAUSE [][ key in
that order to close the corresponding servos and put the player into play mode.
Pin 5 (FCS. IN)
Pin 4 (GND)
Figure 4
Focus Gain Adjustment
Higher gain
Optimum gain
Lower gain
1-14