Pioneer PD-J400T User Manual

6.
Focus
servo
loop
gain
adjustment
@ Objective
To optimize the focus servo loop gain
@
Symptom
when
out
of
adjustment
Playback does not start or focus actuator noisy
@
Measurement
instrument
|
See
Figure
6.
connections
@ Player state Test mode, play
[Settings] @ Adjustment location
VR152 (FCS GAN)
CH1 CH2
20 mV/division 5 mV/division
X-Y mode
@ Disc YEDS-7
[Procedure]
1.
Set
the
AF
generator
output
to
1.2
kHz
and
1
Vp-p.
2.
Press
the
MANUAL
/TRACK
SEARCH
FWD
>
/
PRI
or
REV
Kd
/
<td
key
to
move
the
pickup
to
halfway
across
the
disc
(R
=
35
mm),
then
press
the
PROGRAM
key,
and
do
twice
the
PLAY/PAUSE
b>
/
I]
key
in
that
order
to
close
the
corresponding
servos
and
put
the
player
into
play
mode.
.
Adjust
VR152
(FCS
GAN)
so
that
the
Lissajous
waveform
is
symmetrical
about
the
X
axis
and
the
Y
axis.
(FCS IN)
4 PIN
(GND)
6 PIN
(FCS ERR)
Figure 6
Focus Gain Adjustment
Higher gain
Optimum gain Lower gain
34

Pioneer PD-J400T Specifications

General

Brand	Pioneer
Model	PD-J400T
Category	CD Player
Language	English