Xerox DOCUPRINT N4525 Service Quick Reference Manual page 171

Step 2
The Inverter Counterclockwise Clutch switches on and rotates the Offset Roller
backwards, driving the sheet of paper back into the Exit Unit. The Exit Gate Solenoid
toggles the Exit Gate so the paper path runs to the Exit Roller. The Exit Roller drives the
sheet of paper toward the Duplex Unit. The Duplex Exit Solenoid toggles the Duplex Exit
Gate such that the paper path runs to the Duplex Transport Roller 1. Two sets of Transport
Rollers drive the paper down to the Wait Roller. The paper stops momentarily at the Wait
Roller. When it is time to send the sheet of paper back into the printer for printing on the
second side, the Wait Clutch switches on and the Wait Roller drives the paper out the
bottom of the Duplex Unit and into the printer Registration Roller. The paper stops at the
Registration Roller so the image on the Drum can align with the leading edge of the paper.
When registration is complete, the Registration Roller drives the paper into the Drum and
Bias Transfer Roller where the second side is printed.
Second Image
S4525-323
Fig 3-4 Duplex Paper Path - Step 2
Volume 3 / Duplex Unit - General Information 3-503