Pioneer PD-M602/KUXJ Manual de servicio - Página 27

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PD-M602

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

CHI

CH2

@ Adjustment location

| VR152 (FCS. GAN)

20mV/division

5mV/division

[Procedure]

1. Set the AF generator output to 1.2 kHz and 1 Vp-p.

2. Press the TRACK / MANUAL SEARCH FWDD>? - Dtf or REV KK - <k/ key to move the pickup to halfway across

the disc (R=35 mm), then press the PGM (PROGRAM) key, the PLAY [>> key, then the PAUSE []] key 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.

Pin 5 (FCS. IN)

Pin 4 (GND)

Focus Gain Adjustment

Higher gain

Optimum gain

Lower gain