09-20-2017 02:10 PM
I recently purchased a MF634CDW direct from Canon for my home office. I set it up and seemed like all was OK, but my wife reported that the machine had an error message. I power cycled and then it seemed fine, but I now realize that whenever the device goes into sleep mode, and you send a print job, it displays an error message and you have to power cycle to get it to function again.
I am not using the wireless functionality and am using the wired network. Other then turning off the sleep mode altogether and accepting that this device has flaws, I don't have another option. I downloaded and installed the latest firmware but it did not fix the issue.
05-10-2019 03:57 PM - edited 08-07-2019 01:38 PM
OK, I think I have successfully solved this issue on my network - the resolution is specific to ASUS router. I would guess similar settings exist on other routers.
Check out this post ( I am copying over so the instructions are not lost) - FOR ASUS ROUTERS ONLY
This solved pretty much all issues for me. I can print when the printer is sleeping, it wakes up, prints, and goes back to sleep again.
Edit : 8/7/2019 - I have returned the printer since it doesnt work with Unifi / Amplifi which is the gold standard for high throughput pro/ semi pro wifi systems. Too much headache.
08-02-2019 12:23 PM
I would very much like to follow these instructions, but none of the things you list under the "professional" tab are listed for my rouer. I have the ASUS RT-AC55U. Please help - thanks!
08-04-2019 01:08 PM
Thank you for sharing what worked for you and congratulations on successfully troubleshooting your issue.
For the benefit of others, I just want to point out that I can see from your instructions that the problem you are solving is for a wireless connection. That type of connection is always trickier than a hard-wired connection.
Many of us are still waiting for canon to solve their problem with hard-wired connections, for which their printer driver's failure has no excuse.
08-07-2019 01:33 PM
08-07-2019 01:21 PM
Hi katmichaels.
It is recommended that you contact your router manufacturer for assistance with your router settings.
09-21-2019 06:42 PM
09-23-2019 08:15 PM
Hit me before that. My wife has been having the problem for a year. My problems started 6 months ago. People have been having this problem since at least 2014. I worked software development and support for four decades - I never would have let a problem slide for 5 years. Too many companies underrate the value of support and only place noobies and the incompetent in support. My first job had a mixture of both. One of them literally was a "people person, dammit" (Office Space reference).
08-07-2019 09:17 PM
I have had my MF634Cdw for over a year; every time Canon updates the drivers, I have issues with getting anything to print. This last update 7/26/19 changed my printer type to "AIR PRINT" . I have no idea what that is.
But this not waking up from sleep mode could be my problem, thought it has not ever happened before. How would I turn that Sleep mode off?
10-14-2019 11:12 AM
Does anyone from Canon ever look at this problem?
I have tried connecting with USB cable directly, tried connecting wirelessly with a new router. NOTHING WORKS. With the number of emails regarding this situation I should think even mediocre customer service would have addressed this by now.
I try to send print jobs and all I get is that the Mac computer is looking for a printer. The wireless setup on the printer shows that it is connected. But the print jobs are not going through.
HELP!!!!!!!!!
10-21-2019 12:27 PM
Hi ktbfrod.
If you have tried all of those steps, and the issue remains, then there may be another internal issue with the printer. Please call our telephone support group at 1-800-OK-CANON (652-2666), Monday - Friday 10:00 a.m. to 6:30 p.m. ET (excluding holidays). A representative will be able to perform further troubleshooting steps to try and resolve the issue.
09/26/2024: New firmware updates are available.
EOS R5 Mark II - Version 1.0.1
EOS R6 Mark II - Version 1.5.0
07/01/2024: New firmware updates are available.
04/16/2024: New firmware updates are available.
RF100-300mm F2.8 L IS USM - Version 1.0.6
RF400mm F2.8 L IS USM - Version 1.0.6
RF600mm F4 L IS USM - Version 1.0.6
RF800mm F5.6 L IS USM - Version 1.0.4
RF1200mm F8 L IS USM - Version 1.0.4
Canon U.S.A Inc. All Rights Reserved. Reproduction in whole or part without permission is prohibited.