Trouble with an older scanner

I'm assuming this scanner interface is a SCSI connection. First thing you may want to look at is the SCSI ID number switch at the very back end of the scanner. Before changing the SCSI ID switch make sure your scanner is powered down. Repeat steps above when trying different SCSI ID numbers to see which one works with your computer. If you have other SCSI devices connected make sure they are not sharing the same SCSI ID # which will cause a conflict.