In The Bypass Tray - Xerox WC PE120 Series User Manual

In the Bypass Tray

"Bypass Jam" appears on the display when you try to print using
the Bypass tray and the machine does not detect paper. This
may be a lack of paper or improper paper loading.
If the paper is not feeding properly, pull the paper out of the
machine.
To resume printing, open and close the front door.
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Troubleshooting