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CHANGE REG'D SIZE → PAPER SETTINGS
CHECK DOCUMENT
CLOSE COVER TONER COVER
The paper size is not appropriate for 2-sided copying.
Set the paper size to <LTR> or <A4>. For details, see "Setting Paper Size and Type."
A document jam may have occurred in the ADF.
Remove the jammed document.
The toner cover is not closed completely.
Check the toner cover, and make sure that it is completely closed.