EXP Computer C4077-90960 - Manual (Page 124)

Printing from Tray 1
The presence of paper in Tray 1 is detected by the Tray 1 Paper Present
Sensor (PS1301). The lifting plate pressurization solenoid (SL2) is then
activated, releasing the plate which applies upward pressure on the paper,
causing it to contact the Tray 1 pickup roller. The Tray 1 Feed Clutch (CL3)
turns on at this time and feeds the paper from Tray 1 to the registration
position.
The remainder of the Tray 1 print process is identical to the Tray 2 and 3
process, described above.
Printing from the Envelope Feeder
The Envelope Feeder mounts in slots above Tray 1. The printer can print
from Tray 1 when the Envelope Feeder is installed. When the print job
calls for an envelope, it is fed directly to the Registration Assembly. From
there, the print process is identical to the Tray 2 and 3 process, described
above.
Printing from Tray 4 (2000-Sheet Input Unit)
Tray 4 feeds the paper upward through a guide slot in the Lower Right Door
Assembly to the Paper Input Unit. Once there, the operation is the same as
printing from Trays 2 and 3.
Two-Sided Printing
The Duplex Unit mounts inside the printer below the Fusing Assembly.
The back side of the paper is printed first, the paper is turned over, and
then fed back to the Registration Assembly for front side printing. When
the print job calls for 2-sided printing, a solenoid in the Duplex Unit
operates the duplex flipper in the Diverter Assembly and routes the paper
to the Duplex Unit. The paper does not exit the printer when being turned
over for 2-sided printing. It is routed through a slot in the back of the
Duplex Unit, down inside the left cover and under Tray 3. When the
Duplex Unit senses the trailing edge of the paper, it reverses direction and
feeds the paper back through the Duplex Unit to the Registration Assembly.
5
Functional Overview
Functional Overview 5-39