HP 4300 Service Manual - Page 117

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 properly 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" on page 274. Envelope feeder pickup delay jam If the pickup sensor (PS103) does not detect the leading edge of the envelope within a specific 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-fed 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" on page 274. Envelope feeder pickup stationary jam If the envelope multiple feed sensor (PS902) detects multiple fed envelopes after the pickup operation begins The transport process stops and a 13.XX.YY message appears on the controlpanel display. For more information about jam messages, see "Numerical printer messages" on page 274. Q2431-90912 Chapter 5 Theory of operation 97