![]() ![]() I thought I'd have to reinstall the drivers, but on searching I found a great solution from Jeff Widmer which worked instantly - no rebooting, no unplugging etc! I'm posting it here, with slightly quicker steps. Similarly with other scanning apps I tried, like Abbyy Finereader - I just got error messages. ![]() The MF Toolbox app appeared but, although previously it would automatically scan to PDF, nothing happened after that, no matter what buttons I clicked. In my case the scanner function on my Canon i-Sensys MF4150 LaserBase laser multifunction printer, copier, scanner and fax suddenly started playing up and it wouldn't scan anything, whatever application I tried to use, even though the printer and copier worked fine. I've not tried it on other i-Sensys MF4100 imageClass series devices, like MF4120 or MF4140, but it worked like a charm on my MF4150. If your Canon multi-function scanner has suddenly stopped working and won't scan, and you're troubleshooting error messages like "Unable to open TWAIN source", "Cannot open TWAIN source", "Source initialization failed" on trying to scan, here's an easy solution to the problem that's worth trying. ![]()
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