imageFORMULA R40 Continually giving message "Cannot find scanner. Check the power and the cables."

[hfrost]

My scanner is giving me this message each time I try to scan. "Cannot find scanner. Check the power and the cables." I have tried plugging it into new outlets, using a different USB connecting cord, and I have removed the CaptureOnTouch V4 software and re downloaded that. Please help! I have windows 11 on my hp desktop

[blink2210x]

Amazing!! Thank you,  I’ve spent the last few weeks trying to fix this, on the phone with UK technical support and they kept saying it’s my laptop that’s causing the issue.  
Followed your instructions and now I’m back up and working again!  Def must be caused by a windows update.

[davereit]

THIS instantly fixed the problem (caused, apparently, but the latest windows 11 update). THANK YOU!

[Rsweed · Accepted solution]

I had the same issue and tried several things. Finally, I Just went to the canon website and downloaded the install software again and ran it. I didn't uninstall or anything and my scanner worked immediately after. Hope this works for you too.

[Jeff_Sallee]

I tried to use the registry fix tool, but it did not fix all the issues.  I had to manually edit the registry by finding the right GUID and then ensuring the {GUID}/#### setting was the same in the GUID and the R40 entry.  

It took me several hours to fix this. I remembered there was a registry issue, but could not find the details.  I've had the same issue when I updated from Windows 10 to Windows 11 and with the last Windows 11 major update.  Once I had the Registry sorted, I uninstalled everything related to the R40, rebooted, then reinstalled everything, then rebooted again.  It works now.  

I spent way too much time going down the route of changing the Thin Client from disabled to Citrix: TWAIN Redirection and multiple uninstall/reinstall cycles.  I tried different cables, different ports, etc.  

This scanner is working now.  It is my favorite peripheral. Anytime I receive a paper document in the mail, it is scanned and filed.  Easy to find things now. I eliminated two 2-drawer filing cabinets since I purchased this scanner.  It is Great!  I just wish Microsoft would stop crashing it with their updates.  

[paulak]

Regarding this Windows 11/registry issue, I have attempted all the steps you outlined, and find myself down to the remaining step of manual Registry edit.  Could you please reply with the exact GUID registry lines you reference, so I can try to identify and fix them on my computer?  Thank you.

[NotSoOldNick]

Thanks Rsweed, that worked for me! My scanner is a p-150, and I use Windows 11x64. I re-installed "P-150 ISIS/TWAIN Driver Version 1.0 SP5", and voila.

[sloanish]

Complete directions (from Jdecker1) all in one place to fix this issue caused by the recent Windows update.
1) Exit out of the CaptureOnTouch out of your system tray
2) Go to this folder
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\CaptureOnTouch\Tool

3) Click on the shortcut for System Configuration
4) Under Thin Client Mode, change from Disabled to Citrix: Twain Redirection, then click ok.
5) Open up CaptureOntouch and the problem is fixed. Hope this helps someone else out there.

Tested OK

[ordad12]

OK, I am really stupid. I just updated to Release 24H2 and I cannot find a ProgramData file on the C: drive. And I can't find System Configuration in the CaptureOnTouch folder in the Program Files folder. 

[sloanish]

Complete directions (from Jdecker1) all in one place to fix this issue caused by the recent Windows update.
1) Exit out of the CaptureOnTouch out of your system tray
2) Go to this folder
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\CaptureOnTouch\Tool

3) Click on the shortcut for System Configuration
4) Under Thin Client Mode, change from Disabled to Citrix: Twain Redirection, then click ok.
5) Open up CaptureOntouch and the problem is fixed. Hope this helps someone else out there.

[ordad12]

I appreciate the reply, but I checked again in File Explorer and I do not have a ProgramData folder on my C:/ drive. I have a Program Files folder and a Program File (x86) folder, but no ProgramData folder.