Canon LBP7780CX User Manual page 912

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Contact your local authorized Canon dealer to request service.
When contacting your Canon dealer, please report also the error code which you noted down in Step 2.
If you are not sure what the problem is, contact your local authorized Canon dealer.
A Message Appears in the Display
See the following and solve the problem according to the message.
"A Message Appears in the Control Panel"
The Display Is Turned Off
The printer has entered Sleep Mode while it is offline.
Release Sleep Mode.
"Sleep Mode"
Place the printer online.
"Online and Offline"

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