Epson ActionScanner II - Manual (Page 8)

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Turn off your Macintosh, scanner, and all peripheral devices.
Caution:
Be sure that your Macintosh, scanner, and all peripheral devices
are turned off before you plug in the SCSI cable.
Plug the 25-pin connector into the SCSI port on the Macintosh
with a icon above it. Tighten the two screws on the
sides of the connector.
Connect the 50-pin end of the cable to either the top or
bottom SCSI connector on the scanner; then fasten the
connector with the wire clamps on its side.
Turn on the scanner by pressing the OPERATE button. The
green OPERATE light comes on on the top right side of the
scanner. The READY light comes on when the scanner has
warmed up.
Then turn on your Macintosh. (Always turn on the scanner
before turning on the Macintosh.)