BASF 6106 - Page 57

4-3.3.3.
TRACK
ZERO SWITCH
ADJUSTMENT
CHECK
a.
Select
mini
disk drive
and
start
drive
motor.
b.
Monitor
TJ2-3
(TRACK
ZERO
SWITCH)
SYNC
AlITO
CH
1
2
V
/
Div.
TJ2-3
MODE
:
CH
1 only
TIME
BASE
: 10
msec/
Div.
Step
out
to
track
Check
space
between
head carriage
and
outer
stop
for
~
2.5
mm.
If
the
space
is
not
correct
provide
track zero
switch
adjustment.
Check if
track
zero
switch
closes
(TJ2-3
—«. low)
between
track 3 and
2 when
stepping
towards track
zero
and opens
(TJ2-3
—
•>
high)
between
track 2
and 3 when
stepping
from
track
to
track
4 . If
the
track
zero
switch
will not
chan-
ge within
these limits
provide track
zero switch adjustment.
TRACK
ZERO
SWITCH
ADJUSTMENT
Load Test
Disk
Select
mini
disk
drive and
start
drive
motor.
Measure
with
Oscilloscope.
AUTO
2V/DIV
TJ2-6
(TPACK
00)
2V/DIV
TJ2-3
(TRACK
- SWITCH
)
Chopped
10
msec/DIV
SYNC
CH
1
CH Z
MODE
TIME
BASE
Step
the
head
carriage out
until
the
head
carriage
touches
the outer
stop.
Step in
until
CHI
goes
high
(normally one
step
in).
Now the
head
carriage is
positioned
at
track
0.
Loosen
the
track o
switch
and adjust
it
that
it
will
close
(TJ2-3:
high—*low)
between
track
3
and
2 when
the
head carriage
is
mo-
ved towards
track
and will
open
(TJ2-3: low
—
-.high) between
track
2
and 3
when the
head carriage
is
step-
ped from track
to track
4.
4
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