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LD-V4300D
6. PICK-UP ASSEMBLY CENTERING
CHECK
• Purpose: To check that the
center of the spindle
motor is on the track
or
the
laser
beam.
Maasurement
equipment
&Jgs
~aswement equipment
connecting
points
Player condition
Adjusting points
• Oscilloscope
•
Oscilloscope:
In
FTSB
•
Service mode:
• Test
disc:
GGV1003
assembly
•
Play
mode
CHl(X):
• Trackina servo loop open
lletwe.n
TP1-9(TRKG
•
Tilt
servo
OFF
Error) and GND
CH2
(Y):
TPl-4 (TRKG
A+C)
Adjusting
procedure
I. With the player set
horizontally,
play the test
disc.
S.
aose the tracking
servo
and
move the pick-up toward
2. After
moving the pick-up toward inside
of
the disc us-
the outside of
the
disc
using the SCAN FWD
keys.
ing
the
Step keys,
open
the cracking servo.
Then,
open
the
tracking
servo
again, and observe
the
3.
Connect the X-input
(CHI) of
1he
oscilloscope
to
Lissajous
waveform.
At
this
time, check that
the Y-axis
TPl-9
(TRKG
ERROR) in FTSB
assembly
and
the
amplitude
of
the Lissajous waveform is
the same as
the
Y•input
(CH2) 10
TPl-4 (TRKO
A+ C).
recorded one
in
step 4.
Set
the
oscilloscope
to
the
X·Y
mode,
and
observe the
If
the
Lissajous waveforms
of
the
inside and outside of
Lissajous
wave( onn of the
T
RKG
error
siinaJ and the
the
disc
arc
different in
their
Y-axis amplitude, perform
TRKO
A
+C
signal.
"7.
Pick-up
Assembly Centering
Adjustment".
(See
4.
Record
the
Y
·axis
amplitude
of
the
Lissajous
page 116)
waveform.
Adjustment diagram
Osei I loscope
fTS8a•emblv
0
~
0
!
O@
CHI
~
~
CH2<>
[)
CN4
-
0
1§)
0
~
D
0
0
D
0~
0
0
0
l5l'a
~ I §
Fig.&-1
109
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