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NOTE
THE TRACK 16 RADIUS IS 1.9167 INCHES FROM THE CENTER Of THE
H\.JB.
OTHER TRACK LOCATIONS ARE COMPUTED BASED UPON 48 TPI.
3.
Select the drive.
4.
Insert a certified alignment diskette, Dysan Number 224/2A,
into the drive.
5.
Select Head 0, the lower head.
6.
Read Track 16 for Radial Track alignment of the lower head.
7.
Adjust the oscilloscope to observe a Cats Eye pattern
(Figure 5-6).
8.
Verify the smaller of the two Cats Eye patterns is not less
than 75 percent in amplitude of the other one.
NOTE
THE 75 PERCENT FIGURE IS FOR USE WITH AN ALIGNMENT DISKETTE
VERIFIED AGAINST A STANDARD ALIGNMENT DISKETTE.
9.
Ste'p the drive to Track 0; then, step it back to Track 16.
10.
Verify the Cats Eye pattern.
11.
Step the drive to Track 26 or higher; then, step it back
to Track 16.
12.
Verify the Cats Eye pattern.
13.
Switch to Head 1, the upper head.
14.
Read Track 16 to verify the alignment of the upper head,
if applicable.
15.
Verify the Cats Eye pattern.
16.
step the drive to Track 0; then, step it back to Track 16.
17.
Verify the Cats Eye pattern.
18.
step the drive to Track 26 or higher; then, step it back to
Track 16.
19.
Verify the Cats Eye pattern.
20.
If all the checks verify, the radial track alignment
is acceptable.
21.
If any check does not ver i fy,
the stepper motor must
be adjusted.
5-9
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