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Measure the azimuth burst. Ensure that Burst 1
is less than or equal to Burst 2, and that Burst
4 is less than or equal to Burst 3.
1
E. Figure 2-10 depicts an azimuth of exactly minus 9, 12, or 18 minutes, depending upon
the manufacturer of the diskette used. This is the lower limit of allowable azimuth error.
Bursts 1 and 2 are of equal amplitude. If this signal is observed, the Cats Eye alignment
should be checked prior to any corrective action.
F. Figure 2-11 depicts an alignment of exactly plus 9, 12, or 18 minutes, depending upon
the manufacturer of the diskette used. Bursts 3 and 4 are of equal amplitude. This is the
upper limit of allowable azimuth error. If this signal is observed, the Cats Eye alignment
should be checked prior to any corrective action.
G. After the lower head has been checked, switch to read on the upper head and observe
the azimuth pattern. Both the upper and lower heads should be within the specification.
Note
2
3
4
Figure 2-9
Optimum Head Azimuth A l i gnment
3 '
Figure 2-10
Head Azimuth of Acceptable Lower Limits
2-1 1
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