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TABLE 3-4
DIAGNOSTIC MODE OF OPERATION
DL
M4
M3
Ml
Test
Description of Test
-
-
-
-
°
Seek to Track 0, and turn on spindle motor. This test
seeks the carriage to Track 0, and turns on the spindle
motor. It may be used to check the Track
°
status.
-
-
-
X
1
Seek to Track 1, and turn on spindle motor. This test
seeks the carriage to Track 1, and turns on the spindle
motor. It may be used for index-to-data burst testing
with an alignment diskette.
-
-
X
-
2
Seek to Track
38
from Track 0, and turn on spindle
motor. This test seeks the carriage to Track 0, then to
Track 38. It may be used for radial alignment adjust-
ment with an alignment diskette.
-
-
X
X
3
Seek to Track
38
from Track 76, and turn on spindle
motor. This test seeks the carriage to Track 76, then to
Track 38. This test, along with the previous one, is used
to measure hysteresis.
-
X
-
-
4
Seek to Track 76, and turn on spindle motor. This test
seeks the carriage to Track 76, and turns on the spindle
motor. This test may be used to check index-to-data
burst and azimuth.
-
X
-
X
5
Seek to Track 75, and turn on spindle motor. This test
seeks the carriage to Track 75, and turns on the spindle
motor.
-
X
X
-
6
Toggle front panel L.E.D. with each revolution of the disk.
This test toggles the front panel L.E.D. at the leading
edge of each side zero index pulse. A single-sided disk
should be used for this test.
-
X
X
X
7
Toggle front panel L.E.D. with each revolution of the disk.
This test toggles the front panel L.E.D. at the leading
edge of each side one index pulse. A double-sided disk
should be used for this test.
X
-
-
-
8
Alternate seek between Track 0 and Track 76 with spindle
motor on. This test continuously moves the carriage
between Tracks
°
and 76. This test is used to exercise
the positioner system.
X
-
-
X
9
Seek to Track 2, and monitor the Track 0 sensor. This
test moves the carriage to Track 2, and displays the
state of the Track 0 sensor. The Track 0 sensor should
3-15
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