Canon MB5400 SERIES Online Manual page 1355

6933
Cause
Printer error has occurred.
What to Do
Turn off the printer and unplug it.
Plug in the printer again and turn it back on.
If this does not solve the problem, contact your nearest Canon service center to request a repair.
Important
• If you unplug, all the faxes stored in the printer's memory are deleted.
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