Canon MX520 series Online Manual page 129

For details on each setting item:
FAX settings
Print settings
LAN settings
Device user settings
Mobile phone print settings
Bluetooth settings
PictBridge print settings
Language selection
Firmware update
Reset setting
Note
You can use the machine considering the environment, such as setting 2-sided printing as default.
About ECO settings
You can reduce the operating noise when printing at night.
About Quiet setting