Dell 5535dn Service Manual page 294

Duplex
Functions of main components
When the duplex is installed, duplex (double-sided) printing is available with the printer.
The following outlines the functions of the main components of the duplex.
Sensor (duplex input)
The sensor (duplex wait) detects whether media is remaining in the duplex.
Duplex drive motor assembly
The duplex drive motor assembly transmits driving force to the two duplex media transport roll assemblies and
the duplex media center transport roll assembly middle that feeds media.
Sensor (duplex input)
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Service Manual
Duplex drive
motor assembly