HP LaserJet P4510 Service Manual - Page 136
Pickup-and-feed block,
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Figure 5-24 Pickup, feed, and delivery blocks Fixing/delivery unit Face-down delivery Face-up delivery Pickup/feed unit Pickup-and-feed block The following 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 When it receives a print command from the host computer, the DC controller PCA turns on the feed motor (M101) power. The motor drives the Tray 2 pickup, feed, and separation rollers. The drum 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 product. The separation roller prevents multiple sheets of media from being fed at one time. As the pre-feed sensor (PS102) detects the media, the dc controller PCA turns off the clutch, which stops the media. When the DC controller PCA detects that the laser/scanner is ready it activates the feed clutch again. The feed roller moves the media farther into the product. The registration shutter corrects page skew and the media is transported to the fuser/delivery block. 122 Chapter 5 Theory of operation ENWW