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LD-V4300D
'
3. PICK-UP HBGHT ADJUSTMENT AND DRIVE SHAFT LEVELNESS ADJUSTMENT
•
Purpose: Adjust
the inclination
of the slider
shaft
so
that the pick-up
assembly moves
parallel
the
disc.
•
Symptoms
when incorrectly adjusted:
Lens comes contact
with the disc
surface,
Warped discs
cannot
be played.
Measurement
equipment
Measurement equipment
Player condition
Adjusting points
&jigs
· connecting
points
•
Oscilloscope
•
Oscilloscope:
In FTSB
•
Service mode:
•
Pick-up height adjustment
•
Hexagonal
wrench
assembly
• Play
mode
screw
in the
pick-up
(2mm)
CHl: Between
TPI -
3
•
T racking servo loop open
assembly
•
1.-0w-pass filter
(FOCS
RTN) and GND
•
Tilt
servo
OFF
• Pinion
gear
of
the
lilt
(IOOkO/lµF)
motor in
the
mechanism
•
Test disc:
GGV1003
assembly
Adjusting procedure
Note:
This
adjustment should be
performed with
the )
the voltage value
comes
withln
the
standard
value us-
unit
placed horizontally.
ing the hexagonal
wrench
(2mm}.
(Pick-up assembly height adjustment)
(Drive shaft levelness adjustment)
I
.
Connect
the oscilloscope as
shown in the figure below,
5.
Perform the level
adjustment by
changing
the
screen
and
play the t~t
disc around the
frame
#
10000.
to the
service mode and confirming that
the
tilt
func-
2. O~n
the
tracking servo
loop.
tion
is
OFF. Move the tilt
motor
UP/DOWN by
using
3.
Measure the volt.1ge at
TPl-3
(FOCS
RTN)
in
the
tile
(SKIP
REV/FWD)
key
on the
remote eontrol
unit
FTSB
assembly
with
the oscilloscope.
so
tbat
the
focus
return
voltage described
above
4. Check that
the
focus
retum
voltage
is
0V
±
l0mV
with
becomes
tile
same value
as
the
inside and
outside
of
respect
to
the
GND
voltage.
If
it
is
out
of
the
standard,
the
disc. {Fig.
3-
l)
adjust
the
pick
-
up
height
adjustment
SCTew so
that
"'Frame
No.
115
=
VJ
•
Frame
No.
10000
=
V2
• Frame No. 22000
=
V3
VI
- V2
S: 20
mV
V3 - V2
~
20
mV
Adjustment diagram
FTSB
ass&mbly
~
D
Q@l
~
Ose.illoscope
TP1
[)
@
0
'
......
,
,--------
..
@
0
CH1
'
'
Isl
0
:1µ Fi
IOOMSl
!
~
n
~
Pick
-
up
height
adjustment screw
0
u
=@
0
0 D
0
0
I
0
~
!§ii§
Fig.
3-1
1
06
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