Yesterday I was helping friends to set up their new Retina iMac & they couldn't find the driver discs for the multi-function printer. It has wi-fi connectivity, plus ethernet & USB, so I connected it via wi-fi to their broadband router and the printer part became available under Printers & Scanners in System Preferences. However, the scanner wasn't showing up.
Next I opened Image Capture, which detected the scanner then downloaded & installed the necessary software to get the scanner working in Image Capture & Preview.
They're happy enough with that, having come from a cranky & unresponsive Windoze 10 setup.