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Q2431-90912 Chapter 5 Theory of operation 87
Printer jam detection
The printer uses the following sensors to detect the presence of media and to verify if the media
is being fed properly or has jammed. For information about the location of these sensors, see
“Printer switches and sensors” on page 336.
● Pre-fed sensor (PS102)
● Top of page sensor (PS103)
● Fuser delivery sensor (PS108)
The microprocessor on the DC controller PCA checks for media jamming by timing the passing
of the media as it moves past these sensors. If the media does not pass the sensor in a specific
period of time, the transport process is stopped (motors are turned off and the rollers no longer
rotate) and a jam message appears on the control-panel display.
Printer pickup delay jam from tray 1
If the top of page sensor (PS103) does not detect the leading edge of the media within a specific
time after the media is picked up the microprocessor on the DC controller PCA determines there
is a pickup jam.
Note The printer attempts to re-pickup the media several times before determining there is a pickup
jam. The number of re-pickup tries depends on the pickup source (for example, the re-pickup is
tried 4 times if tray 1 is the pickup source).
The transport process is stopped and a 13.XX.YY JAM message appears on the control-panel
display. For more information about jam messages, see “Alphabetical printer messages” on
page 258 and “Numerical printer messages” on page 274.
Printer pickup delay jam from tray 2
If the pre-feed sensor (PS102) does not detect the leading edge of the media within a specific
time after the media is picked up the microprocessor on the DC controller PCA determines there
is a pickup jam.
Note The printer attempts to re-pickup the media several times before determining there is a pickup
jam. The number of re-pickup tries depends on the pickup source (for example, the re-pickup is
tried 4 times if tray 1 is the pickup source).
The transport process is stopped and a 13.XX.YY JAM message appears on the control-panel
display. For more information about jam messages, see “Alphabetical printer messages” on
page 258 and “Numerical printer messages” on page 274.
Printer pickup stationary jam
If the top of page sensor (PS103) does not detect the trailing edge of the media within a specific
time after the media is picked up the microprocessor on the DC controller PCA determines there
is a pickup jam.
The transport process is stopped and a 13.XX.YY JAM message appears on the control-panel
display. For more information about jam messages, see “Alphabetical printer messages” on
page 258 and “Numerical printer messages” on page 274.