the duplex unit in a copier of a is the section of the copy machine used to make for double sided copies. in my time as a copy of technician, I never really ran into too many problems with the duplex units.
Here are some topics that will cover in this section:
What you can clean yourself
Tips / do's and don'ts for the duplex tray
paper jam going into the duplex
paper jam inside duplex
paper jam going out of duplex
paper jam when making double sided copies
