BASF 6106 - Positioning System

4.3.3.
POSITIONING
SYSTEM
The
positioning
system
consists
of
the
step-
per
motor
with spiral
wheel,
the
head
car-
riage assembly and the
track
00
microswi
ten .
4.3.3.1.
TRACK ADJUSTMENT
CHECK
a. Load
a BASF
-
CE Mini Disk
b. Start
the drive motor
and
select
the
mini
disk drive.
c. Allow
10 minutes
warm
up
time, then
step the
carriage
to track
16.
d-
Measure with
oscilloscope:
SYNC : EXT.
POS.
TJ2-8
INDEX
CH
1
:
AC
50
mV
imcalibrated
inverted
TJ1-"
CH 2
: AC 50 mV
imcalibrated
jJl-P
MODE
:
ADD
TIME
BASE
: 10 ms/ Iiv.uncalibrated
Monitor the
read
signal
on the screen
and
adjust
the time
base
of the scope
until
four
orientation
bursts
are
shown.
.
Turn
the
variable gain
potentiometer
until
the
amplitude
of
the first
orientation
burst
reaches
60
scale
units.
. Determine
X and
Y.
(see
Example!)
X
Uj
-
U,
Caution:
Pay
attention
to sign
Y
«
U,
-
U,
EXAMPLE:
X
-
U\
'1
-
U
2
-
2 scale
units
^
-
U
4
-
4 scale
units
Z-X+Y-
+
2-4--2
scale
units
U,
h.
Calculate
Z
2
-
X
Y
i.
If
2
exceeds
15
scale*
units
proceed
with
point
e.
of
track adjustment
procedure
(4.4.3.2.)
•