Canon PRO-6000 Online Manual page 841

6900
Cause
A printer error has occurred.
What to Do
Turn off the power and unplug the power cord.
Wait at least 10 seconds, and then turn the power back on.
If the error appears again, make a note of the detailed error code (ECxx-xxxx) that appears on the touch
screen, and then contact a Canon customer service center.
Detailed error codes
EC51-3000
841