How to get OS X to recognise scanner/printer is turned on, without rebooting

I have a Canon MP560 printer/scanner combo, installed and working.

However typically when I turn on the power to the printer and click 'Open Scanner...' I get the following error:

Needless to say the scanner is switched ON and the cable IS connected.

If I reboot my macbook then everything works fine. This is a pain in the neck though. I would like to find a way to get the scanner working without having to reboot.

Full details of my setup:

• Macbook Air running Mavericks 10.9.5


• -->connected to CalDigit Thunderbolt dock


• -->connected via USB and HDMI to Dell monitor


• -->connected to printer via USB cable

I don't doubt the intermediate elements in the USB chain probably contribute to the problem, however I will note that everything works fine after I reboot my macbook (with printer switched on and connected).

I don't mind if it's a fiddly hack, deleting plist files etc, as long as I don't have to reboot.

It is physically inconvenient to connect the printer directly to the mac.

It is not the same problem as this How I can get OSX to recognize Canon MP560 Scanner again? since I see the printer and scanner listed as installed.