Pioneer PD-M603 Manual de serviço - Página 28

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PD-M603

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

[Settings]

CHI

CH2

@ Adjustment location

|VR151 (TRK. GAN)

[Procedure]

1. Set the AF generator output to 1.2 kHz and 2 Vp-p.

2. Press the TRACK/MANUAL

SEARCH FWD b> - bbl 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 [> key, then the PAUSE []] key in that

order to close the corresponding servos and put the player into play mode.

3. Adjust VRIS1 (TRK. GAN) so that the Lissajous waveform is symmetrical about the X axis and the Y axis.

Figure 5

Tracking Gain Adjustment

Higher gain

Optimum gain

Lower gain