Xerox DOCUPRINT N4525 Service Quick Reference Manual page 173

Duplex Unit Paper Path Components
The Duplex Unit Paper Path is made up of a number of transport rollers and paper sensors.
1.
Exit Gate and Exit Gate Solenoid
Diverts paper to either the Duplex Transport Roller #1 or to the Face Up Bin.
2.
Transport Roller #1 and Pinch Roller
Drives paper down through the Duplex Unit and into the lower Transport Roller.
3.
Transport Roller #2 and Pinch Roller
Drive the paper into the Wait Roller.
4.
Wait Sensor
Monitors paper at the Wait Roller. Holds paper there until it is time to refeed the
sheet into the printer, to the Registration Roller.
5.
Wait Roller and Pinch Roller
Refeed the sheet into the printer for the second side printing (at the proper
time). The Wait Roller drives the paper out of the Duplex Unit and back into the
printer.
6.
Exit Roller
Drives paper out of the Duplex Unit and into the Face Up output Bin.
7.
Exit Sensor
Monitors paper travel through the Exit Roller and into the Face Up output Bin.
Volume 3 / Duplex Unit - General Information 3-505