Q: Lexmark scanner no longer functions

If you haven't done so already, try resetting the printing system.

OS X Mavericks: Reset the printing system  also Yosemite

I'm having precisely the same issue with a Lexmark x2670 on 10.10.2

It throws "The scan operation is canceled" error every time I try a Scan or an Overview Scan.

I've restarted, reset the scanner, unplugged the scanner's power supply, and I reset the printing system, no change.

What scanning software are you using?

Applications folder most likely. Finder>Applications. The one I use is called MP Navigator. I have a Canon printer. I would imagine there is a Lexmark printer application.

Does Lexmark have current drivers for these scanners? Neither of these models is shown on OS X: Printer and scanner software available for download - Apple Support

If you're unsure you can go to the Lexmark site and download the most recent software for your unit. I just went to their site and it was fairly straight forward.

It might be in the Utilities folder. You could try to download and install the newest driver and see if that works. If not try to contact Lexmark Support.

Lexmark just told me moments ago (March 23, 2015) that there will not be a 10.10 driver issued for my X2650 and that I need to buy a new printer.  The 2013 10.9 driver is the end of the line.  Then they offered me, as a "Prestige" customer, 30% off a new unit.  Class act that was.