Canon iR2520 UFRII LT not working in MAC OS 10.9.

You need to open System Information, as seen in the 4th row. Then with System Information open, you can select Printers in the left column.

Okay. That image shows you are using the Generic Postscript driver included with OS X rather than the UFR2 driver. The iR2520 does not support the Postscript printer language, so that explains why you cannot print.

If you navigate to /Library/Printers/Canon, do you see a folder called "CUPS_Printer"? This is the folder the UFR2 v10.3.0 driver installer will create. If it is not present then run the UFR2 installer again.

Do you see a folder called CUPS_Printer inside the Canon folder?

Good, that shows the UFR2 driver is installed.

Are you sure you have the correct IP address for the iR2520? If you enter this IP address into a web browser you should connect to the internal web page of the copier. Does this happen?

If the IP address is correct, open Printers and Scanners and click the plus button to add. Select the IP icon and enter the IP address. Set the protocol to HP Jetdirect. Leave the Queue name blank. Change the Name to iR2520. Leave the Location blank. Then in the Use menu, click on "Select printer software" and look for the Canon iR2520 in the Printer Software window. When found, select it and click OK. Then click Add to complete the queue creation. Now see if you can print.

Good to read it is now working for you.