Missing SCSI Device (3550)

1.  Power-off the 3550 Expansion Unit and disconnect all internal and external SCSI  devices from the 3550 Expansion Unit.

       See 'Automatic Configuration' before continuing.

2.  Power-on the 3550 Expansion Unit and run 'Automatic Configuration'.
   •  If the built-in SCSI controller  is not on the Installed Device List in  advanced diagnostics,  replace the system board of the 3550 Expansion Unit.

3.  Reconnect the devices to the 3550 Expansion Unit.
   NOTE:   The built-in SCSI controller includes an active terminator. This  terminator automatically works when an external  SCSI  device is attached.

4.  Go to 'Undetermined Problem'.