Canon C750 - Uneven Magenta Ink Lay

OUPrint872

Member
Anyone seen this? Canon cannot figure out it out. Any Canon techs out there?

We have a Canon C750, less than 30K on it . On magenta ONLY, we are getting a distortion line (lead to tail) down the sheet. Tech has replaced developer/housing, image drum, transfer roller with no change. No other colors are being affected, but all the imaging parts for that color has been replaced and are new. Problem still persists. Any information would be helpful. Thanks.

Mag_Issue.jpg
 
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DYP

Well-known member
Anyone seen this? Canon cannot figure out it out. Any Canon techs out there?

We have a Canon C750, less than 30K on it . On magenta ONLY, we are getting a distortion line (lead to tail) down the sheet. Tech has replaced developer/housing, image drum, transfer roller with no change. No other colors are being affected, but all the imaging parts for that color has been replaced and are new. Problem still persists. Any information would be helpful. Thanks.
Has the laser/laser window been checked for dirt on it?
 

OUPrint872

Member
printing656 - I uploaded an image to the original post.

DYP - Every image component has been replaced with new and the machine is clean as a whistle.
 

OUPrint872

Member
Everything has had a new swap. They even brought a (known perfect) image belt unit in and it still happens. Tech's are baffled because it not the known issues.
 

OUPrint872

Member
No change, original equipment or new.

Note: CYK are perfectly clean. Only M is the problem.
 
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DYP

Well-known member
If all Magenta imaging parts have been changed making no difference then software needs to be looked, but I am assuming that there is a uniform density routine and I would have thought it would have been run and or reset back to default and run. I also assumed you have ruled out paper.
 

Some Guy

Member
Does the line go to edge of paper (Beyond the white border)? If so, you've got bad charge on the drum, or a malfunctioning LED/ROS driver. I'm referring to the dark line 1/4 of the page from the Right Edge. Above is assuming top of image is either LE/TE

If R side of image is LE/TE, it looks like you might have harmonic banding, which would point to dev HVPS for that color. Hard to see with glare in the photo
 
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OUPrint872

Member
Canon tech came in with a new High Voltage Power Supply Board. They also changed out the Magenta drum again. Problem is fixed!

Tech's theory is that this Canon engine uses the magenta leg as its reference color and the drum kept getting the brunt of the improperly operating HVPS.

"SOME GUY" was spot on. Thanks folks!
 

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