HP LaserJet 4250 Service Manual - Page 155
Stacker jam detection, Stacker-feed jam, Stacker-feed stationary jam, Stacker residual-media jam
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Stacker jam detection The stacker uses the following sensors to detect the presence of media and to verify whether the media is feeding correctly or is jamming. For information about the location of these sensors, see Stacker and stapler/stacker switches and sensors. ■ Paper-inlet sensor (PS1101) ■ Paper-delivery sensor (PS102) Stacker-feed jam If the paper-inlet sensor (PS1101) does not detect the leading edge of the media within a specified period of time after the stacker driver has received the paper-delivery signal, the dc controller PCA determines that a stacker-feed delay jam has occurred. The transport process stops and a 13.XX.YY JAM message appears on the control-panel display. For more information about jam messages, see Alphabetical printer messages and Numerical printer messages. Stacker-feed stationary jam If the paper-inlet sensor (PS1101) does not detect the trailing edge of the media within a specified period of time after the paper-inlet sensor (PS1101) detected the leading edge of the media, the dc controller PCA determines that a stacker feed-delay jam has occurred. The transport process stops and a 13.XX.YY JAM message appears on the control-panel display. For more information about jam messages, see Alphabetical printer messages and Numerical printer messages. Stacker residual-media jam If the paper-inlet sensor (PS1101) or the paper delivery sensor (PS1102) detects media during the initial drive period, the dc controller PCA determines that a stacker residual-media jam has occurred. The transport process stops and a 13.XX.YY JAM message appears on the control-panel display. For more information about jam messages, see Alphabetical printer messages and Numerical printer messages. NOTE This jam message only appears if the paper-delivery sensor (PS1102) detects media at the start of the initial drive. Stacker and stapler/stacker 141