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Paper Feed System
Note
The LJ 5 printer designators differ as follows.
LJ 4 / 4 Plus Multipurpose (MP) Tray Paper Cassette (PC) Tray Lower Cassette (LC) Tray
LJ 5 Tray 1Tray 2Tray 3
The following paper paths are described in this section of the
manual:
• PC Tray (Tray 2) to Output Trays
• MP Tray (Tray 1) to Output Trays
The paper feed system is responsible for picking paper from
either the PC tray (Tray 2) or MP tray (Tray 1) and delivering it
to the image formation system, feeding it into the fusing station,
and delivering the paper to the output tray (see Figure 5-16).
The Paper Feed Assembly is a modular, replaceable paper-feeder
mechanism which allows media to be input from either of four
sources. The four paper input sources of the printer are:
• The MP Tray (Tray 1)
• The PC Tray (Tray 2)
• The Lower Cassette (Tray 3)
• The Envelope Feeder
Each input has features which makes it the best choice for
various applications. For instance, short media and heavy stock
can be fed from the MP tray (Tray 1) because it senses media
length and has a relatively straight paper path. Large print jobs
can be fed reliably from the optional Lower Cassette (Tray 3).
The Paper Feed Assembly contains a state machine which
monitors input sensors and generates commands for the solenoids
and motors on the Paper Feed Assembly. In addition, the Paper
Feed Assembly communicates with the DC Controller through
serial data lines. An illustration of this is M2, the Paper Feed
Motor. M2 is controlled solely by the Paper Feed Assembly state
machine. M2 begins rotation when the State Machine receives
the correct set of conditions from its inputs and the serial data
lines. M2 stops rotation when the Input Registration sensor (PS1)
reports the presence of paper to the State Machine. The State
Machine outputs the presence of paper to the DC Controller
through the serial data line.
5-26 Functional Overview