Xerox Phaser 4500 Service Manual page 70

Theory of Operation
2-34
Gear Layout
1. Roller gears
2. Idle gear 29
3. Idle gear 47
Functional Components
Two-sided printing is enabled by mounting the duplex unit on the rear side of
the base engine.
Duplex unit switch
duplex unit housing cover are closed.
Duplex unit sensor
duplex unit.
Duplex unit fan
to prevent abnormal temperature rise in the duplex unit.
Duplex roller
into the printer through the duplex unit, to print on the second surface.
Duplex unit PWBA
from the HVPS/engine logic board and information from sensors and
switches, and controls paper transport through the duplex unit.
Duplex unit motor
the paper through the duplex unit.
1
This switch detects that the duplex unit lower housing and
This sensor detects the presence or absence of paper in the
This fan vents air within the duplex unit and takes in outside air,
This roller feeds the paper having the printed first surface back
The CPU on the duplex unit PWBA receives instructions
This motor drives the three duplex rollers, which transport
2
3
4
5
6
s4500-029
4. Idle gear 77
5. Duplex unit motor
6. Idle gear 57/37
Phaser 4500/4510 Service Manual