AGFA DuoScan Owner's Manual page 8

The figure "rear view" illustrates the location of the different parts at the rear of your scanner.
1. power input
2. thumb wheel (to pull out the main board)
3. 25-pin connector
4. 50-pin connector
5. SCSI ID switch
1 2 3 4 5 2
Chapter 1 — Preparing the scanner 8