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Misalignment (true value)
=
{
OS6'
x
100-(-6)
-
(65-50)
0.61
x
0.42
=
-5.2(%)
If the calculated value is positive, the magnetic head is shifted
inward from the reference position, while the head is shifted outward
from the reference position when the value is negative.
(8) Conversely, measure
VA
and VB when the head is on the alignment check
track by stepping-out after one o r several step-ins.
(9) Calculate the true value of misalignment as described in item (7).
(10) Confirm that both of the calculated values in items (7) and (9) are
within the following range.
True value of misalignment:
309,
Max.
(11) Execute items
(4)
through (10) for side
0
and side 1 heads respectively.
(122 If the value in item (10) or (11) is out of the specified range, adjust
the track alignment according to the following procedure.
(a) Loosen the two fixing screws of the stepping motor a little.
(b) Insert the alignment adjustment jig of
I43
screw from the back side
of the FDD as shown in Fig.3419.
(c) Repeat step-in and step-out operations and adjust the misalignment
to be the smallest on the alignment check track during both step-in
and step-out operations by turning the jig or the screw (stepping
motor moves little by little).
Note: When you adjust the alignment by observing the lobe pattern
using the oscilloscope, pay attention to the calibration value
on the alignment disk label and the ambient relative humidity.
-
3453
-
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