Scanning issue with Canon printer

Apple's built-in AirPrint supports this device without any Canon software or drivers, provided you are using it via Wi-Fi, or Ethernet. That vendor independence may appeal to you. AirPrint does not support USB connections unless connected to a small number of supported print servers.

Provided you have the device networked and powered, visit System Preferences > Printers & Scanners panel. If the device is shown in Printers, right-click on that icon and select Reset printing system… Or, if not present, click the [+] button to add it. In either case, a panel will appear where Apple's Bonjour discovered the network device, and you can choose Use: AirPrint rather than Canon drivers. Click Add. You should be able to print, and scanning is supported via Apple's Image Capture.

Can you print to the TS9520 using AirPrint? There may be a specific TS9520 scanner setup on that Printers & Scanners panel that informs it you are using Apple's Image Capture application.