HP Color LaserJet 9500 Service Manual - Page 65

Paper path and jam detection ● Paper input-The device receives media from the printer. ● Flipper-FLEntry1 senses the media and activates the flipper motors. For face-up printing, the flipper delivers the media (which the FLEntry senses) to the face-up bin. Otherwise, the flipper changes page orientation from face-up to face-down and delivers media to the paperpath module. ● Paper path-The paper-path module delivers face-down print jobs to the accumulator assembly. This module is bypassed if the destination is the face-up bin. ● Accumulator assembly-The accumulator assembly collects and registers print jobs from the flipper (which the GWSens senses), sends them to the carriage assembly for stapling, and delivers them to the stapler bin (which the ACExit senses). Face-up path Face-down path Path through accumulator Accumulator exit sensor Gear-wheel sensor Accumulator Flipper entry sensor Flipper entry sensor 1 Interlock switch Paper input from the printer Flipper Flipper exit sensor Stapler and carriage Controller PCA Power supply Figure 28. Stapler/stacker jam detection The paper-path sensors detect jams at the following locations: ● Flipper entry sensor 1 (FLEntry1) and flipper entry sensor (FLEntry) ● Flipper exit sensor (FLExit) ● Paper-path sensor (Exit) ● Gear-wheel sensor (GWSens) ● Accumulator entry sensor (ACEntry) ● Accumulator exit sensor (ACExit) ENWW Chapter 5 Theory of operation 63