Pioneer XR-P340M Manuel d'utilisateur télécharger pdf (Page 37)

xR-P7 4oM, XR-P64{)M,

XR-P34()M

xR-P7 4{), XR-P64{),

XR-P340

Tracking

Servo

Loop

Gain Adjustment

Objective

Symptom when out

of adjustment

To optimize the tracking servo loop

gain.

Playback

does

not

start, during searches the actuator is noisy, or tracks

are skipped.

Measurement

Instrument

Connections

See Fig. 5.

ISettings]

CH1

50mVzldivision

X-Y

mode

CHz

20mVzldivision

Player

State

Adjustment Location

Disc

Test mode,

play

vR8151

(TRK

GAN)

YEDS_7

lProcedurel

Set the AF

generator

output to l.2kHz

and

2Vp-p.

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

halfway across the di5g

(ft:35mm),

then

press

the 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

axis and the Y axis.

Pin3

(TRIN)

Pin4

(GND)

Pin2

(TRER)

0.001

Low

pass

filter

Fis.

Tracking

Gain Adjustment

(10:

1.2kHz

(10:

2VP-P

ffi

Higher

gain

Optimum

gain

Lower

gain

1-37

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 62 63

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Pioneer XR-P340M Manuel d'utilisateur Page 37

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