Lexmark T520 - 20ppm 8MB Par USB Pcl6 Ps3 Ppds Service Manual page 161

4520-xxx
Error Message 24x (x=Tray 1 through 5) Paper Jam Check Tray x
The paper has not cleared the pass thru sensor or reached the pass
thru sensor of the option above tray x.
Error Message 250 - Paper Jam - Check MP Feeder
The paper is jammed in the multipurpose feeder and has not
reached the base machine input sensor or has not reached the input
sensor in time.
Error Message 260 Paper Jam - Check Envelope Feeder
An envelope is jammed in the envelope feeder or has not reached
the base machine input sensor.
Error Message 27x Paper Jam - Check Bin x
Paper is jammed in output bin. Generally this message appears
when the paper has not cleared the exit sensor in time, has jammed
in the redrive assembly or has not fed into the output bin.
Diagnostic Aids
3-29