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Top Products
xR-P7 4oM, XR-P64{)M,
XR-P34()M
xR-P7 4{), XR-P64{),
XR-P340
I
Tracking
Servo
Loop
Gain Adjustment
o
Objective
O
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.
o
Measurement
Instrument
Connections
See Fig. 5.
ISettings]
CH1
50mVzldivision
X-Y
mode
CHz
20mVzldivision
o
Player
State
o
Adjustment Location
o
Disc
Test mode,
play
vR8151
(TRK
GAN)
YEDS_7
lProcedurel
1.
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
X
axis and the Y axis.
Pin3
(TRIN)
Pin4
(GND)
Pin2
(TRER)
0.001
uF
Low
pass
filter
Fis.
Tracking
Gain Adjustment
(10:
1)
1.2kHz
(10:
t1
2VP-P
ffi
Higher
gain
Optimum
gain
Lower
gain
1-37