HP LaserJet 4250 Service Manual - Page 128
Paper-pickup-and-feed system, rollers in the HP LaserJet 4200 Series printers. The HP LaserJet 4250 - fuser error
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Paper-pickup-and-feed system The pickup-and-feed system consists of various rollers that the printer motors drive. The printer uses tray 1 (the manual feeding tray) and a cassette in tray 2 as media sources. The printed media is delivered to either the rear output bin (straight-through printing) or the top output bin (the default destination). One 500-sheet feeder and one 1,500-sheet feeder can be added to HP LaserJet 4200/4300 Series printers. Two additional 500-sheet feeders and one 1,500-sheet feeder can be added to HP LaserJet 4250/4350 Series printers. These accessories are discussed later in this chapter. The tray 1 paper sensor (on the tray 1 pickup assembly; PS105) detects media in tray 1. The tray 2 paper sensor (PS101) detects media in tray 2. The paper-size sensor (PS106) and the paper-size switch (SW102) detect the media that is loaded in the tray 2 cassette. Two motors, a clutch, and a solenoid that are controlled by the dc controller PCA drive all of the rollers in the HP LaserJet 4200 Series printers. The HP LaserJet 4250, 4300, and 4350 Series printers use three motors, a clutch, and a solenoid. See Motor and fan control. The pre-feed, top-of-page, and fuser-assembly delivery sensors (PS102, PS103, PS108) detect media arriving and passing along the paper path. If the media does not reach or pass these sensors within a specific amount of time, the microprocessor on the dc controller PCA halts the printer functions and a jam error message appears on the control-panel display. See Alphabetical printer messages and Numerical printer messages. For information about the location of printer switches, sensors, and motors see Printer switches and sensors and Printer motors and fans. 114 5 Theory of operation