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5.
Adjustment and
Check
5-1
Spindle
Speed
Adjustment (See
Fig.
5-1)
a)
Insert
and clamp
a blank diskette while
DC
motor
is
rotating.
b)
Move
the
head
to
trackOO.
c)
Connect
the
frequency counter
to
TP6
d)
Check
that
counter
shows 200±3ms.
e)
If
the
counter
value
shows
out
of
range,
turn
the variable
resistor
(VR1
)
on
DC
motor board
locates
bottom
of
drive.
Spindle
speed goes
slower by
turning
to
the
left,
faster to
the
right.
f)
If
the
counter value
shows
out
of
range
after
taking
method
(e),
exchange
the
drive
belt
and
repeat from
(d).
g)
If
the
counter
value
still
shows
out
of
range
after
exchanging
the
drive
belt,
exchange
the
DC
motor and/or
DC
motor
board.
VR1
Fig. 5-1
Spindle Speed Adjustment
5-2
a)
b)
c)
d)
Radial
Track Adjustment (See
Fig.
5-2)
Insert
and clamp
a
CE
diskette.
Move
the
head
to
track
1
6
and check
the
cat's-eye
waveform
of
the top
and bottom
heads.
Adjust as follows
if
one
of
the top
or
bottom head
is
not
more
than
75%
in
an amplitude
ratio of
two
waveform.
Slightly
loosen the
fixed
screws
of
the stepping
motor assembly and
move
the stepping
motor back
or
forward
to
adjust the
amplitude
ratio.
The
amplitude
of
two
wave
forms should be
nearly the
same,
then
tighten the
stepping
motor assembly
fixing
screw.
Check
the cat's-eye
waveform
of
top
and bottom
heads.
Repeat
from
(d)
if
adjustment
fails.
Measuring
Condition
Channel
1
-TP1 (10mv/div)
Channel
2
-TP2
(10mv/div),
invert
Mode
-ADD
Sweep
-20ms/div
Stepping Motor
Assy
-^
X100
75
'A
Fig.
5-2
Radial Track Adjustment
11
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