NEC FD1165 - Head Radial Alignment Waveform

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