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c.
Check the waveform (see Figure 5-2).
that
are displayed
should be
within
other in amplitude.
The two lobes
70%
of
each
ON TRACK 38
EQUAL AMPLITUDE
MAX
MAX
OFF TRACK 38
TOWARD TRACK 37
ADJUST IF A/B<70%
-MAX
-MAX
OFF TRACK 38
TOWARD TRACK 39
ADJUST IF B/A<70%
Figure 5-2
Head Radial Alignment Waveform
d.
If
the ratio of
the lobes of the waveform is not
within specifications,
loosen
the
two screws· that
fasten
th~
carriage to the base frame and adjust the
carriage position
(in
or
out)
with
the
adjusting
driver (see Figure 5-3).
e.
Tighten the screws.
f.
Unload the heads, step the carriage to track 76 then
step it back to track
38,
and load the heads for
three minutes.
g.
Recheck the waveform.
h.
If the waveform is within specifications, check the
00 track sensor (see Section 5.5.2).
5-5
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