Canon LBP7780CX User Manual page 439

3. When you have finished entering all the values, press [OK] for the setting to take effect.
If you are not sure what to enter in [IP Address]:
If you are not sure what values you should enter for the IP address, contact your network administrator or see
"Determining Which IP Address to Assign to the
7
Perform a hard reset or restart the printer.
The settings become effective after hard resetting or restarting the printer.
NOTE
About details of hard reset
See "Canceling All the Jobs (Hard
Printer" for more information.
Reset)."