Service Manual
5-13
Theory of Operation
5
The Phaser 440 does not reverse the drum to “back up” the print to the start
position for each pass during printing. This is one of the reasons for the
Phaser 440's fast print times.
Print unloading
To unload the print after printing, the drum rotates clockwise until the trailing
edge of the paper flips out into the exit path, then the drum motor rotates the
drum counterclockwise to the clamp-open position. This also pushes the print to
the lower exit rollers. The paper-feed motor, running backward for a set amount
of time, drives the lower and upper exit rollers, which pull the print through the
rollers and out to the printer's output tray. The print engine checks to make sure
that the paper's trailing edge has passed the paper-exit sensor. After a set
amount of time, the drum rotates to park the paper clamp under the bail rollers
(to prevent them from denting the drum). Then the paper-feed motor is turned
off, completing the print process.
Figure 5-8 Raising the thermal head between passes
Figure 5-9 Ejecting the print
8699-15A
Between passes,
the thermal head
raises to allow
the paper clamp
to pass
8699-16
Upper
exit rollers
Lower exit
rollers
Paper-
exit
sensor
Bail
rollers
