In Device Manager>Universal Serial Bus controllers>Unknown USB Device (Device Descriptor Request Failedĩ. When I do get an error msg it is usually a "Cannot communicate with scanner"Ĩ. Completely removed and reinstalled the driver several timesħ. (Turning it off is not an option, other networked users need it on, nor is leaving the PC on)ģ.Have the latest driver from the Canon websiteĤ. The software (canon toolbox or windows scan) will just hang indefinitely.Ģ.If the MF is powered down on PC boot and powered up after booting, the scanner WILL work. Any subsequent boot (cold or warm) and it fails to work if the MF is left on. After my building a new PC with Windows 8.1, my Canon MF4270 (which worked fine with Win 7 Ultimate) scanning function will only work:ġ.When the driver is first installed.
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