10-18-2020 08:54 AM - edited 10-18-2020 08:57 AM
I'm having this problem too with my Mac running Sierra. When I first got the mf743cdw, I was able to install the scanner driver and used it once, but since then my computer hasn't been able to find it. I can't add my printer at all through the MF Toolbox using either Bonjour or the IP address (it says the "specified scanner is not supported"), and while I can add it to the MF Scan Utility (and believe me, I've been saying "MF!" a lot during this process), it appears in Bonjour and I can add the IP address, but it says it cannoy commuicate with the scanner. Tried reinstalling and uninstalling, but nothing works. I can connect through Remote UI no problem and it shows the scanner is ready. Canon really needs to fix this problem with the drivers, it is extremely frustrating. Couple that with the fact that we're using the same unit with 3 other computers (Mac and PC), so any change in IP address or network settings makes those computers unable to find the printer.
The good news is that I did find a workaround. If I go into the Settings/Printers & Scanners, and then select the "Scan" tab there's a button to "Open Scanner" which opens Apple's built-in scanner interface... it's not great to work with, but I can indeed scan without having to reinstall anything. Also, I need to wake up the printer sometimes before it will work, but damnit, I can scan!
11-04-2020 01:47 PM
I understand you are having an issue with scanning via your wireless network with your Color imageCLASS MF743Cdw using the scanning software provided with the printer. Your MF743Cdw uses the MF Scan Utility to scan (it is not compatible with the MF Toolbox). For clarification, I have a couple of follow up questions:
1) Did you use steps similar to these instructions at this LINK to register the network scanner using the Bonjour connection?
1-1) If so, when you open the Canon MF Scan Utility from the Applications menu, is the MF743Cdw (or MF740 Series) listed in the main dialog box?
If you need immediate assistance and you're in the USA, please click http://Canon.us/ContactCF for our US-based support. If you're outside of the US, please click http://Canon.us/4xf7 for support options.
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11-08-2020 06:47 PM
Thank you for your reply. I have followed the procedure to register the scanner through the Canon MF Scan Utility, but my computer never seems to be able to find it to scan after I add it. As I said, it worked once, the first time I set it up, but the next time I tried to scan, the computer said it couldn't find the scanner, and I'm in the state I'm in now no matter how many times I readd it, or which way I add it, through Bonjour or IP address.
As I said, I have a workaround of using the built-in scanning window, so I am able to scan.
06-05-2021 01:02 PM
06-13-2021 11:43 AM - edited 06-13-2021 11:46 AM
Wow, thanks rubyit for that comprehensive set of instructions! I am happy to report that I believe I found my own solution to the problem. It turns out that the cause was probably my Verizon router, which seemed to cause the printer's IP address to constantly change any time we lost power or I had to reboot the router (which was often because it was so old). The old router was recently replaced and my connection with the printer/scanner appears to be stable for the time being (I have even been able to use the MF Scan Utility), however if the problem occurs again, I'll be sure to use these steps.
06-13-2021 04:40 PM
Thank you Ruby! I made the changes you recommeded and all appears to be working much better. I very much appreciate you taking the time to create this detailed and complete set of instructions - Thank you!!
06-13-2021 07:42 PM
I tried all these settings and it seems to print well but I still can't get the scanner to work. If I choose to scan to "Computer", it says "Connect computer". If I try to activate the scanner from my Mac, it doesn't see it and when I try to add by IP address, it also doesn't see it.
How in the heck do I get this to scan. I said it before and I will say it again - I want to throw this printer out the window!!! If it wasn't so darn heavy I would! It has been nothing but headache after headache for two years now. And every time I go to print (which isn't real often), I have to delete the printer and add it back for it to work. I'm hoping the settings you recommeded will fix that issue. But I still can't scan. I can scan on a USB stick (after trying stick after stick and it saying it doesn't support this device), but that is a pain in the butt. I want to scan right to my computer.
What can I do to get this to work? Canon can you help? Why does it ask to connect my computer? It's wireless and on the same network! And I said this before - my old Epson printer worked flawlessly with wireless printing/scanning and I didn't have to constantly mess with settings.
I'm a senior software engineer. If I can't figure this printer out, who can? I never felt so dumb using a printer! Does anyone want to buy mine cheap???? I will never buy another Canon printer again!