HP LaserJet 4250 Service Manual - Page 138
Printer delivery-delay jams, Printer door-open jam, Printer residual-media jam, XX.YY JAM
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If the fuser delivery sensor (PS108) does not detect the trailing edge of the media within a specified period of time after a printer delivery wrap jam is detected, or if the fuser delivery sensor (PS108) does not detect the trailing edge of the media within a specified period of time after it has detected the leading edge of the media, the microprocessor on the dc controller PCA determines that a printer delivery wrap 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 or Numerical printer messages. Printer delivery-delay jams If the fuser delivery sensor (PS108) does not detect the trailing edge of the media within a specified period of time after detecting the leading edge of the media, the microprocessor on the dc controller PCA determines that a fuser stationary 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 or Numerical printer messages. If the fuser delivery sensor (PS108) detects the trailing edge (paper out) of the media within a specified period of time after it has detected the leading edge of the media, the microprocessor on the dc controller PCA determines that a delivery jam has occurred. However, if the paper-length that the top-of-page sensor (PS103) detects does not match the media size that the printer expects from the pickup source, this jam is ignored. The top-of-page sensor (PS103) determines the length of the page by measuring the time it takes between when the leading and trailing edges of the page pass the sensor. 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 or Numerical printer messages. NOTE This jam cannot be detected for pages that are less than 200 mm (7.9 inches) in length. Printer door-open jam If the top door is opened during printing, the top-door-open switch (SW101) is activated and the microprocessor on the dc controller PCA determines that a door-open 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 or Numerical printer messages. Printer residual-media jam If neither the top-of-page sensor (PS103) nor the fuser-delivery sensor (PS108) detects the leading edge of the media at the start of initial rotation (see Table 5-1 Basic printer operating sequence), the microprocessor on the dc controller PCA identifies a residual-media jam. 124 5 Theory of operation