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A complete check of the servo system is performed. The test performs worst case
repositions, forward and reverse speed checks, and high speed rewinds, for
example.
Diagnostic Test 96 (Servo Reposition Exeraser)
Parameter A
=
forward time in seconds; parameter B = reverse time in seconds.
A scratch tape is needed for this test.
The drive continuously repositions to EOT and then rewinds if parameter A is
greater than or equal to parameter B. Otherwise, the tape unit repositions until it
reaches BOT.
Diagnostic Test 97 (Servo Close Loops Test)
A scratch tape needed for this test.
The ability to close the servo loops is tested.
Diagnostic Test 98 (Read Channel Gain Profile Display)
Parameter A
=
density.
This test displays the read channel gain profile for the selected density. The display
will show "TX WY" where X is the track number (1 to 9 and A) and YYY is the gain
needed for that track. The Diagnostic Select switch can be used to view all the
tracks. Track A is the average of all 9 tracks. The Enter button is used t o terminate
gain display. The gain profiles are generated by Test 99.
Values range from 158 to 205. Typical good values are between 170 and 195.
If the range of values displayed is greater than 10, clean the read/write head and
run test 99.
Diagnostic Test 99 (Read Channel Calibration Test)
Note: Ensure that the read/write head is clean before you start this test.
Parameter A
=
density; parameter B
=
SAVETTEMP. A CE tape is needed for this
test.
Calibrates the read channel gain profile. A tape which is typical of those used on
the tape unit should be used for the calibration. This test writes a calibration pattern
on the tape and then reads the pattern to calibrate the tape unit. The tape unit
should be calibrated in both 6250 and 1600 densities. If parameter B is set to SAVE,
the calculated gain profile is saved in battery powered storage. If parameter B is
set to TEMP, the calculated gain profile is discarded after this test is complete.
When the test is complete, the gain is displayed (see Test 98). Values range from
158 to 205. Typical correct values are between 170 and 195.
If bad tapes are suspected, volume statistics should be run at the system.
Diagnostic Test 100 (Erase Tape Test)
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8-14
9348
Service Information
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