Pioneer XR-P640M, XR-P340M XR-P7 4oM, XR-P64M, XR-P34M xR-P7 4, XR-P64, XR-P340, CH1, YEDS7

xR-P7 4o￿M, XR-P64{)M, XR-P34()M xR-P7 4{), XR-P64{), XR-P340

I TrackingServo Loop Gain Adjustment

o Objective To optimize the tracking servo loop gain.

OSymptom when out of adjustment

oMeasurement Instrument Connections

lProcedurel

Playback does not start, during searchesthe actuator is noisy, or tracks are skipped.

SeeFig. 5.	o	Player State	Test mode,play
ISettings]	o	Adjustment Location	vR8151(TRK GAN)
CH1
50mVzldivision	o	Disc	YEDS_7
X-Y mode
CHz
20mVzldivision

1. Set the AF generatoroutput to l.2kHz and 2Vp-p.

2 . PresstheMANUAL/TRACKSEARcHFwD>> . >>!keyorREV!<< . << ￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿

halfway acrossthe di5g(ft:35mm), then pressthe DOLBY NR key, thePLAY /PAUSE >/llkey twice in that order to close the corresponding servos and put the player into play mode.

3. Adjust VR8151 (TRK GAN) so that the Lissajous waveform is symmetrical about the X axis and the Y axis.

( 1 0 :1 )

Pin3 (TRIN)
Pin4 (GND)	1.2kHz
	( 1 0 :t 1 2 V P - P
Pin2 (TRER)

0.001uF

Low pass filter

Fis.

Tracking Gain Adjustment

ffi

HighergainOptimumgainLower gain

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