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DL
M3
M4
X
X
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TABLE 3-4
DIAGNOSTIC MODE OF OPERATION
Ml
Test
Description of Test
Seek to Track 0, and turn on spindle motor. This t e st
seeks the carriage to Tr ack 0, and tu rn s on the spindle
motor. It may be used to check the Track 0 status.
Seek to Track 1, and turn on spindle motor. This test
seeks the carriage to Tr ack 1, and t u rn s on the spindle
m otor. It m a y b e u sed fo r i n d ex-to-data bu rst t e s t i n g
with an alignment diskette.
Seek to Track 3 8
motor. T his test seeks the carriage to T r a ck 0, t h en t o
T rack 38. It m a y b e u sed for r a d ial a l i g n m ent a d j u st -
ment with an alignment diskette.
Seek to Track 38 f rom T rack 76 , and turn on spindle
motor. This test seeks the carriage to Track 76, then to
Track 38. This test, along with th e previous one, is used
to measure hysteresis.
Seek to Track 76, and turn on spindle motor. This test
seeks the carriage to Track 76, and turns on the spindle
motor. Thi s t es t m a y b e u s e d t o c h eck i n d ex-to-data
b urst and azimuth .
Seek to Track 75, and turn on spindle motor. This test
seeks the carriage to Track 75, and turns on the spindle
motor.
Toggle front panel L.E.D. with each revolution of the disk.
This test t oggles the f r on t p a nel L . E .D. at th e l eading
edge of each side zero index pulse. A single-sided disk
should be used for this test.
Toggle front panel L.E.D. with each revolution of the disk.
This test t oggles the f r on t p a nel L . E .D. at th e l eading
edge of each side one index pulse. A double-sided disk
should be used for this test.
Alternate seek between Track 0 and Track 76 with spindle
motor on. Th is t e st c o n t i n u o usly m o v es t he c a r r i a g e
between Tracks 0 an d 76. This test i s used to exercise
the positioner system.
Seek to Track 2, and monitor the Track 0 sensor. This
test moves the carriage to Track 2, and displays the
state of th e T r ack 0 sensor. The Track 0 sensor sho"l d
change state at Track 2.
f r o m T r ack 0 , a n d t urn on spindle
3-15
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