Showing results for 
Show  only  | Search instead for 
Did you mean: 

Canon ImageClass MF726CDW Prints Vertical Yellow line on the left side of the page


I have the Canon ImageClass MF726CDW and it Prints Vertical Yellow line on the left side of the page.

My i had the printer for 2 years and had no problems printing, with same type of toners.

Now for the last few weeks it started to have those vertical yellow line, is not a line, is like 1 inch wide line on the left side of the page...

Here is a picture:




I pulled the toners out from the tray and the yellow toner is the last one, and i am seeing some yellow mark on the big belt or whatever is called that i guess paper goes on it, i clean some ,but i can not turn it, from the front of the printer, unless a back cover can be taken of and have easy access, and also how to release the belt so i can manually turn it and wipe some .


What you think it maybe?


Thanks for any advice.




No one?....any help, will appreciated!

Product Expert
Product Expert

Hello patrocle,


I understand your Color imageCLASS MF726Cdw prints a vertical yellow line down the left side of pages.  If you have not already done so, to restore your print quality, I suggest you clean the fixing unit and transfer belt using your MF726Cdw's operation panel using these steps:


1. Press  and tap <Menu>.
2. Tap <Adjustment/Maintenance>.
3. Tap <Clean Fixing Assembly>.
4. Read the message that is displayed, and tap <OK>.
5. Tap <Start>.
  • Cleaning starts. When the <Finished.> message is displayed approximately 1 minute later, press  to return to the <Home> Screen.

Follow these steps to clean the Transfer Belt:

1. Press  and tap <Menu>.
2. Tap <Adjustment/Maintenance>.
3. Tap <Clean ITB>.
4. Tap <Start>.
  • Cleaning starts. When the <Finished.> message is displayed approximately 1 to 2 minutes later, press  to return to the <Home> Screen.

 If you need immediate assistance and you're in the USA, please click for our US-based support. If you're outside of the US, please click for support options.


Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.

Thanks for replying!

I try your guide and looks that did not fix it, it got worse looks like ..., I guess there is something wrong with the transfer belt...that does that.





Both prints where done after your guide.


What next now?


Thank you for your help!


Any other suggestion? how maby to fix this?



I guess not...

If you've followed the above instructions and require further assistance, you'll want to call for support. Our friendly, US-based team can be reached at 1-800-OK-CANON (1-800-652-2666) Monday-Friday 8:00 am to 8:00 pm ET.

Thanks for reply.

I have sent email to support.

Waiting for a reply.


Hello! I realize your question was from 2018, so I am hoping you received a reply by now! 😉 I am having the same issue with the yellow lines printing down the left side.  Did you ever find a solution?

08/18/2023: Canon EOS R5 C training series is released.

07/31/2023: New firmware updates are available.

CR-N700 - Version 1.2.0

CR-N500 - Version 1.3.0

CR-N300 - Version 1.3.0

CR-X300 - Version 1.1.0

06/30/2023: New firmware version is available for EOS-R5 C

05/31/2023: New firmware updates are available.

EOS R6 Mark II - Version 1.1.2

EOS R6 - Version 1.8.2

EOS R7 - Version 1.3.1

05/18/2023: New firmware updates are available.

EOS Rebel T100 - Version 1.1.0

EOS Rebel T7 - Version 1.2.0

EOS 5D Mark IV - Version 1.4.0

EOS 6D Mark II - Version 1.2.0

PowerShot Elph 360HS - Version

PowerShot SX420 IS - Version

PowerShot 620 HS - Version

PowerShot SX720 HS - Version

PowerShot G1X Mark III - Version

PowerShot G7X Mark II - Version

PowerShot G9X Mark II - Version


04/20/2023: New firmware version 1.4.1 is available for EOS R3

03/30/2023: New firmware updates are available.

EOS R5 - Version 1.8.1

EOS 1DX Mark III- Version 1.7.1

Speedlite EL-1 - Version 1.0.2

03/30/2023: Product Advisory for EF50 F1.2 L USM

03/30/2023: Product Advisory for EOS R10

02/24/2023: We've updated Share Your Photos

2/07/2023: New product announcements!

EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM
01/09/2023: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
01/03/2023: Welcome to CES 2023!
12/08/2022: New firmware version is available for EOS C70
12/07/2022: New firmware version 1.7.0 is available for EOS R5