How to troubleshoot Canon scanner no longer scanning via image capture?

I have a Canon MF4770n printer/scanner connected via Ethernet to the home network, and a Mac running Mac OS 10.14.6.

Previously (for years), I could open Image Capture and choose the scanner and thereby scan images to my computer either from the flatbed or the document scanner.

Although the print capabilities still work, AND the scanner still shows in the list in the Image Capture utility, I now get the following error when I actually click the "scan" button in Image Capture:

Scanner reported an error

Cannot communicate with the scanner.
The cable may be disconnected, or the scanner may be turned off.
Check the scanner status and try again.
Scanner driver will be terminated.

Error code: 600104

What's even more interesting, if I click the scan button on the computer without anything in the document feeder, I just get a message that there's nothing in the document feeder. So the scanner is definitely connected. This is repeatedly reproducible.

How can I troubleshoot?

Solution 1:

Can't really help with fixing the problems in Image Capture, but you might be able to scan by alternatively using:

• System Preferences > Printers & Scanners > (name of scanner) > Scan > Open Scanner

We've had weird problems before with Image Capture and this was the provisional workaround. Image Capture magically worked later on in the future, somehow.