Falcon B-300 - Manual (Page 120)

Installing Options 120
Note:
The removed upper rear printer cover should be retained since it will be necessary if you
remove the duplex unit.
3. Insert the bottom side of the duplex unit first, and then attach the duplex unit.
Uninstalling the Optional Duplex Unit
Follow the steps below to uninstall the duplex unit.
1. Turn off the printer.