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FDD412A/B
&. 3.2
(1)
(2)
(3)
Q Track
Sensor
Position
Adjustment
Objective
and
setting
requirements
When
the
carriage
returns
to track
#0,
the TRACK
00 signal
should
be
properly
sensed.
Tools
and
measuring
instruments
to
be
used
(a)
Work
medium
(b)
#2 Phillips
screwdriver
(c)
Synchroscope
(1:1
probe * 2)
(d)
Shorting-plug
(e)
Tester
or system
(i)
Seek
should
be repeatedly
possihle
on
tracks
#0 to 4
to
0.
(ii)
DC power
supply
should
be
available.
(£)
IC clips
(standard
14-pin
type x2,-'or
28-pin
type x1)
Adjustment
(a)
Turn
off
DC power
supply.
(b)
Turn
the
shaft
at
the
step
motor
rear
end
to move
the
head
carriage
towrad
the
outermost
track,
until
the
step
motor
pulley
pin
hits
the
stopper
on
the
step
motor
keep
plate.
(At
this
time,
do not
touch
the
head
carriage,
drive
pulley
and
steel
belt.)
;
(c)
Turn
on
DC
power
and
insert
the
work
medium.
(d)
Short-circuit
JP2
at 4 and
6 with
a shorting-plug
to excite
phase
O of
the
step
motor.
(Steps
(a) to
(d) above
are
carried
out
to initailize
the
carriage
onto
track
#0.)
(e)
Set
the synchroscope.
CH-1:
TRACK
OO-P
(IC14-12
pin
or
1C12-22
pin)
CH-2:
STEP-N
(1C5-11
pin
or
1C12-7
pin)
(f)
Remove
the
shorting-plug
installed
in
step
(d)
above.
(g)
Loosen
the
set
screw
on
the
0 track
sensor,
and move
the
sensor
toward
the
outermost
track
(i.e.,
away
from
the
spindle).
(h)
Move
the
0 track
sensor
bit
by bit
toward
track
#76,
and
hold
it
temporarily
where
the
TRACK
00
signal
is
brought
"High"
for
the
first
time.
(i)
Repeat
seek
operation
on
track
#0 to 4 to 0, and
fine-
adjust
the
sensor
position
so
that
the
TRACK
O0-P
signal
and
STEP
signal
appear
in
such
a relation
to
each
other
as
shown
in Fig.
4.26.
This
adjustment
is made
easier
by
following
the
steps
given
below:
(ii)
Get
a
correct
synchronization
with
the
STEP-N
signal
at
CH-2.
a 7
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