Canon PIXMA iP2850 - Manual (Page 212)

1203
Cause
The cover is opened while printing is in progress.
Action
If paper is left inside the printer, remove the paper slowly with both hands and close the cover.
Press the printer's ON/RESUME button to dismiss the error.
The printer ejects one blank sheet of paper and resumes printing from the next paper.
The printer will not reprint the page that was printed when the cover is opened. Try printing again.
Important
• Do not open or close the cover while printing is in progress, as this can damage the printer.
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