Theory of Operation 2-43
Optional 550-Sheet Feeder This is a mechanism for supplying paper from the
paper tray into the printer. The driving force from the Feeder Motor is transmitted via
the Feed Clutch Assembly to the Feed Roller and Nudger Roller, transporting paper
from the tray into the printer.
As the Nudger Roller picks up paper and the paper level lowers, the position of the
Nudger Roller drops accordingly. The lowered Nudger Roller pushes down the lock
lever of the Bottom Plate Assembly, releasing it. The spring below the Bottom Plate
Assembly pushes it up and lifts the paper, which lifts the Nudger Support Assembly
off of the lock lever of the Bottom Plate Assembly stopping its upward motion.
Turn Roller This roller, working with the Turn Pinch Roller, advances the paper
picked by the Nudger and Feed Rollers into the printer. The Feeder Motor drives the
Turn Roller through the Turn Roller Clutch.
550-Sheet Feeder PWBA A CPU installed in the 550-Sheet Feeder PWBA
receives instructions from the HVPS/Engine Logic Board and from sensors and
switches; the CPU controls feeding operation in the 550-Sheet Feeder.
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