Tandy 1000 SL Technical Reference Manual page 464

pattern, the head is not on the alignment check track.
In such event, execute step-out or step-in for the following tracks'
space to obtain the most similar waveform to that in Fig.3418.
48tpi: 2 tracks
96tpi:
4
tracks
Note: The above number of tracks to be stepped is required to make the
alignment track position be fit with the magnetized condition of
the basic phase "A" of the stepping motor. If the stepped track
numbers are inassured, set it again from track
00
(TRACK
00
output
signal goes to TRUE).
For a 48tpi FDD, the lobe pattern in Fig.3418 shall be observed at
the even track, while it shall be observed at the track of multiple
number of four for a 96tpi FDD.
(61 After one or several step-outs from the check track, step in the head
to the check track again and measure VA and VB at that time.
(71 Calculate the true value of misalignment by substituting the value
in item (6) and ALIGNMENT calibration value (see alignment disk label,
attention to the side).
VA-VB
(Larger value in VA
L
VB
loo
Misalignment (true value) =
-
Calibration value)
-
(Relative humidity-50) x K
"K" is humidity compensation factor.
48tpi
:
K-0.26
96tpi: K-0.42
e.g. 96tpi, VA=O.58V, VB-0.61V, Calibration value=-6(%)
Relative humidity= 65%:
-
3452
-