Figure 28. Stapler/Stacker Jam Detection - HP Color LaserJet 9500 Service Manual

Paper path and jam detection
Face-up path
Face-down path
Path through accumulator
Accumulator exit sensor
Gear-wheel sensor
Accumulator
Figure 28. Stapler/stacker jam detection
The paper-path sensors detect jams at the following locations:
ENWW
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 paper-
path 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).
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)
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
Chapter 5 Theory of operation 63