User Guide

Pickup-and-feed block
The pickup-and-feed system is divided into two blocks: The pickup-and-feed block and the fuser/
delivery block.
Figure 5-6 Pickup-and-feed and fuser/delivery block diagram
1 Fuser/delivery block
2 Pick-up and feed block
The following printer functions take place in the pickup-and-feed block:
■ Detection of media
■ Detection of media-size
■ Detection of media entering the paper path from tray 1 or tray 2
■ Lifting of the tray 2 paper plate
■ Prevention of multiple-feeds
■ Correction of page skew
For information about the locations of switches, sensors, and motors in the pickup-and-feed block,
see
Printer switches and sensors and Printer motors and fans.
When it receives a print command from the host computer, the dc controller PCA turns on the main
motor (M101) power. The motor drives the tray 2 pickup, feed, and separation rollers. In
HP LaserJet 4300 and 4350 Series printers, the print cartridge motor power also turns on. The laser/
scanner motor power turns on.
The dc controller PCA then activates the feed clutch (CL101) to rotate the feed roller. The tray 2
pickup solenoid is activated (SL101) and the pickup arm descends. The pickup roller touches the
media and a sheet is fed into the printer. The separation roller prevents multiple sheets of media
from being fed at one time.
116 5 Theory of operation