HP LaserJet 4250 Service Manual - Page 147
Envelope feeder jam detection, Envelope feeder pickup delay jam
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Figure 5-16 Envelope-feeder pickup-and-feed diagram Envelope feeder jam detection The envelope feeder uses the envelope multiple-feed sensor (PS902) along with sensors in the printer to detect the presence of media and to determine whether the media is feeding correctly or is jamming. If a jam occurs in the envelope feeder, the error message 13.xx.yy appears on the control-panel display. For more information see Numerical printer messages. Envelope feeder pickup delay jam If the pick-up sensor (PS103) does not detect the leading edge of the envelope within a specified period of time after the envelope is picked up, it attempts to pick up the media several times before determining that a pickup jam has occurred. If the pre-feed sensor inside of the printer (PS102) does not detect the leading edge of the envelope within a specific amount of time after the re-pick operation stops, the microprocessor on the dc controller PCA determines that a jam has occurred. The transport process stops and a 13.xx.yy message appears on the control-panel display. For more information about jam messages, see Numerical printer messages. Envelope feeder pickup stationary jam If the envelope multiple-feed sensor (PS902) detects multiple envelopes after the pickup operation begins, the transport process stops and a 13.xx.yy message appears on the control-panel display. For more information about jam messages, see Numerical printer messages. Paper-pickup-and-feed system 133