Jam detection
The MFP uses the following sensors to detect the presence of media and to check whether media is
being fed correctly or has jammed:
■ Pre-feed sensor (PS102)
■ Top-of-page sensor (PS103)
■ Fuser-delivery sensor (PS108)
■ Paper-delivery sensor (PS109)
■ Reversing paper-sensor (PS110)
■ Reversing unit paper-jam sensor (PS111)
The microprocessor on the dc controller checks for jams by timing 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 (the motors are turned off and the rollers no longer rotate) and a jam message appears on
the control-panel display.
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
period of time after the media is picked up, the microprocessor on the dc controller PCA determines
that a pickup jam has occurred.
NOTE The MFP attempts to pick up the media several times before determining that a
pickup jam exists. The number of pickup attempts depends on the source (for example, four
attempts occur if tray 1 is the source).
The transport process stops and a 13.XX.YY JAM message appears on the control-panel display.
For more information about jam messages, see
Resolving control-panel messages.
Pickup delay jam from tray 2
If the pre-feed sensor (PS102) does not detect the leading edge of the media within a specific period
of time after the media is picked up, the microprocessor on the dc controller PCA determines that a
pickup delay jam has occurred.
NOTE The MFP attempts to pick up the media several times before determining that a
pickup jam exists. The number of pickup attempts depends on the source (for example, four
attempts occur if tray 1 is the source).
The transport process stops and a 13.XX.YY JAM message appears on the control-panel display.
For more information about jam messages, see
Resolving control-panel messages.
Pickup stationary jam
If the top-of-page sensor (PS103) does not detect the trailing edge of the media within a specific
period of time after the media is picked up, the microprocessor on the dc controller PCA determines
that a pickup 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
Resolving control-panel messages.
118 5 Theory of operation
To Next Page
Loading...