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6. Tracking Servo Loop Gain Adjustment

@ Objective

To optimize the tracking servo loop gain.

@Measurementinstru-

| See Figure 5.

@ Player state

Test mode, play

ment connections

[Settings]

@ Adjustment location

| VRISI (TRK. GAN)

CHI

CH2

50mV/division

20mV/division

X-Y mode

eps

[Procedure]

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

2. Press the TRACK / MANUAL SEARCH FWD b> Ppl or REV |<kI <i 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 VRI51 (TRK. GAN) so that the Lissajous waveform is symmetrical about the X axis and the Y axis.

Pin 3 (TRK. IN)

Pin 4 (GND)

Low pass filter

Figure 5

Tracking Gain Adjustment

Higher gain

Optimum gain

Lower gain