Filter
Top Products
)(F..P74(,.M.
XR-P64OM,
XR-P34OM
xR-P74(),
XR-P64{J--,
XR-P34O
!
Focus
Servo
Loop
Gain
Adjustment
o
Objective
o
Symptom
when
out
of
adjustment
To optimize
the focus
servo
loop
gain.
Playback
does not start
or focus
actuator
noisy.
o
Measurement
Instrument
Connections
See Fig. 4.
ISettings]
cHl
20mY/division
X-Y mode
CHz
5mVzldivision
o
Player
State
o
Adjustment
Location
a
Disc
Test mode,
play
vR8152
(FCS
GAN)
YEDS-7
lProcedurel
1.
Set the AF
generator
output
to t.2kLlz
and lVp-p.
2.PresstheMANUAL/TRACKSEARcHFwD>>.>>!keyorREV!<<.<<
halfway
across the disc
(R:35mm),
then
press
t}re DOLBY NR
key, thePLAY
/PAUSE
>/D]key
twice in
that order
to close the corresponding
servos
and
put
the
player
into
play
mode.
3. Adjust VR8152
(FCS
GAN) so
that the Lissajous
waveform is
symmetrical
about the X axis
and the Y axis.
(10:1)
Pin5
{FOIN}
Pin4
(GND)
Pin6
(FOER)
Fis. 4
Focus
Gain
Adjustment
ffi,
1.2kHz
1 Vp-p
ffi
Higher
gain
Optimum gain
Lower
gain
1-36