Canon Pixma MX520 Series Online Manual page 457

Cannot Detect the Machine with the Wired LAN: Check 1
Is the LAN cable connected, and are the machine and the router turned on?
Make sure that the LAN cable is connected.
Make sure that the machine is turned on.
Confirming that the Power Is On
Make sure that the router is turned on.
If the LAN cable is connected and the machine or the network device is turned
off:
Turn on the machine or the network device.
After turning on the machine or the network device, it may take some time until ready for use. After a while
just turning on the machine or the network device, click Redetect on the Check Printer Settings screen.
When the machine is detected, follow the instructions on the screen to continue to set up the network
communication.
If the LAN cable is connected and the machine and the network device are turned
on:
If the machine and the network device are turned on or if the machine could not be detected after clicking
Redetect, go to check 2.
Cannot Detect the Machine with the Wired LAN: Check 2