Bio-Rad Model 550, Ultramark, and Benchmark Microplate Reader Accessories - Manual (Page 23)

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Error Message Probable Cause Recommended Solution
SCSI ini. SCSI chip trouble. Contact Bio-Rad.
WCS R/W SCSI SCSI chip trouble. Contact Bio-Rad.
DPR R/W SCSI SCSI chip damaged. Contact Bio-Rad.
SCSI bus Data communication problem
between the Ultramark and
your computer. The Ultramark is not the source of the
problem. Check your computer.
Bus Rst SCSI The termination switch may be
off. Turn the SCSI termination switch on
(located next to SCSI connector).
Another connected SCSI
device is powered off. Turn the connected machine on, or
turn the termination switch on the
Ultramark on.