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Maintenance and Service Guide 4-17
Addendum 108431-001 (11-88) to
Manual No. 108033-003
Monitor Alignment
The Monitor Alignment selection allows you to
check the alignment and intensity of the video
display unit.
Diskette Drive
The Diskette Drive test verifies that the diskette
drive, diskette drive controller, and associated
cables are operating properly.
The following selections are available:
□ Write/Read/Compare
□ Random Seek
□ Verify Diskette
□ Diskette Speed
□ Diskette Change Line
□ Format a Diskette (for diagnostic use only)
NOTE: During certain tests, you may be asked
to insert a blank diskette that has been
formatted for diagnostics. To fully test
a diskette drive, use the highest capac-
ity media intended for the drive. The
diskette must not be write protected.
The following paragraphs describe these selec-
tions.
Write/Read/Compare
The Write/Read/Compare selection verifies that
the diskette drive subsystem writes, reads, and
compares data patterns, that the diskette drive
controller properly resets, and that the diskette
drive controller buffers are valid.
Random Seek
The Random Seek selection verifies that the
diskette drive and the diskette drive controller
randomly seek tracks across the diskette.
Verify Diskette
The Verify Diskette selection verifies the dis-
kette drive by reading the contents of the entire
diskette.
Diskette Speed
The Diskette Speed selection verifies that the dis-
kette drive motor is spinning within the proper
speed range.