User Guide

Printing from the 500-sheet feeder
NOTE HP LaserJet 4200/4300 Series printers support up to two optional 500-sheet feeders.
HP LaserJet 4250/4350 Series printers support up to three optional 500-sheet feeders.
The paper-feeder driver controls the 500-sheet feeder operation sequences. An 8-bit microprocessor
in the paper-feeder driver controls the 500-sheet feeder sequences and the communication with the
dc controller PCA.
The paper-feeder driver drives the solenoid in response to the pickup command. The paper-feeder
driver also reports the paper-feeder status to the dc controller PCA.
The printer delivers a charge of +24 Vdc to the paper feeder, which then generates 5 V for the
integrated circuits.
Figure 5-10 500-sheet feeder I/O block diagram
Paper-pickup-and-feed system 125