My Canon LIDE 600F scanner is old but still worked very well. When I upgraded to OS 10.11 my computer no longer recognized the scanner. Canon has officially stated that they are not making new drivers for this product, but I had a similar issue with my tablet not working and was able to find a solution on this site. Does anyone know of a workaround?
MacOS – Is it possible to use an older Canon Scanner with OS 10.11 El Capitan
canoncompatibilitymacosscanning
Related Solutions
It looks like some old saved settings were causing the scanner to hang indefinitely - pressing scan over and over wasn't working.
I pressed the show details button a few times but didn't realize things were working slowly in the background. After a minute or so - I was able to get into the details, change some settings, and it has been working well.
Those TWAIN errors are not logging now either. Life is good again in Lion scan land.
Have you tried installing this comprehensive Apple Canon Printer/Scanner driver set? I dont have an FS400US I can test this with but its worth a shot.
Best Answer
VueScan might help. Honestly, you're better off buying a new AIO then trying to get these older machines working. You can also try deleting anything related to this Canon scanner that's on your Mac then checking if Preview will recognize it. I was reading here that some people had a limited amount of success doing that.