2-60 Phaser 6121MFP Service Manual
Theory of Operation
Paper Path Through Duplex Unit
The following illustration shows the paper path through the Duplex Unit with the 
Duplex Unit Base Attachment, and the paper path through the Duplex Unit with 
the 500 Sheet Feeder attached.
Duplex Unit Fan
The Duplex Unit Fan moves air through the unit to keep the temperature of the 
LVPS from rising.
The Duplex Unit Fan operates at full-speed at the start of a duplex operation, and 
then slows to half-speed after the duplex operation ends. The fan is off when the 
Duplex Unit is not in use.
s6121mf
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