HP 2600fx - Optical Disk Drive Command Reference Manual page 239

NOTE
Jukebox SCSI-2 Command Set
Log Sense Command (4DH)
Diagnostic User
Number 0 - Poweron
1 - Front Panel
2 - SCSI Bus
3 - FRU Isolation
4 - Error Recovery
5 - SCSI Reset
6 - SCSI Abort
FRU 1 The FRU most likely to be at fault. (See Appendix C).
FRU 2 The second most likely FRU to be at fault. (See
Appendix C).
FRU 3 The third mostly likely FRU to be at fault. (See
Appendix C).
Test Number The diagnostic test number. See Table B-12 on
page B-40 for a list of diagnostic tests.
Time Stamp Indicates when the error occurred (measured in hours
since the odometer was initialized).
The FRU numbers returned indicate the most likely cause of the error,
but these FRUs might not be the actual cause of the problem.
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