I have a PIXMA MG5520 printer. The printer works, the copier works, but when I try to scan, I get a Code 5,157,69. I have uninstalled and reinstalled the software, but nothing seems to work. So my guess is that there is a setting which somehow got changed. Please help.
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I was getting the same error and tried un-install / re-install, which didn't work. Then I turned of my work VPN to see if that was the issue and it was. As soon as I disconnected the VPN it worked again, so the first couple of times I used the scanner I must not have been on my company's VPN. Hope that helps!
I removed the printer from the system, deleted the software, rebooted the computer then re-added the printer and software and continue to have the same problem. For the time being I'll get around it by using the "Scannable" app on my iPhone which does a great job of scanning, correcting and allows me to send the information anywhere via text or email.
I found that the best solution is to quit trying to use the Canon Printer and download "Scanable" to your iPhone. It is an easy-to-use application, will align and clean up the item and you can easily email or text it as needed. When I need something scanned now I use "Scanable" then email it to myself and store it on the computer or print it directly from my phone using airprint. I've given up on trying to get the Canon scanner to work with Windows 10. For some reason the Windows 10 just blocks the scanner regardless of what steps are taken to reload or allow it access.
After much research, I think that I have finally found a solution that worked for me. I have MX490 on Windows 10. When I did the Paint test, listed above, it gave me 2 different scanning options for the same system. Here is what I believe happened. When I used Windows plug and play to add a device it created a generic driver system. Then, I downloaded the actual drivers from Canon. That created another device and driver system for the same scanner. Having 2 drivers for the same system does not work. I believe that the combating drivers/software is when you get the error message "system cannot connect because another user or program is using the system". This is one of the issues I had, along with the error codes in this feed.
So, Here is my solution:
click Control Panel
click or search for Device Manager
click Imaging Devices
single click and hi-lite the driver that you do not want to keep and using the scroll bar on top click X for delete.
Only having 1 driver system solved my problems.
Hope this helps you as well.