Canon iR Advance C5035i Print Fading Problem

[dan7777]

We have had to replace the laser units. I also got a reconditioned laser unit that did not work and finally my boss ordered a new one. On some colors the color faded in areas, not the same color across the page. I was able to get over a million copies at a print shop until they upgraded. It went through two sets of lasers. They are not hard to replace, just make sure they are seated correctly and be careful with the connectors. Remove the drum drawer and transfer belt assembly to get to them. You can clean the mirrors and polygon mirror in the laser but that does not always fix it. In some cases it does but not all.

[onlyinnewfoundland]

Haven't had too many of these problems, but like everyone has said...definitely laser related if it's only occuring in magenta and yellow. By the way these lasers are interchangable (I mean from left to right)..or at least I have had to troubleshoot by swapping. They will work if you just want to see if it's a laser issue.

I have to take these suckers apart on a semi-regular basis for a customer of ours who smokes in the same room as the machine. Oh joy, oh bliss.

Hope you got it working.

[Canuck]

Read this..N08-041-2-soiled mirror.pdf

[malwatson]

I cleaned the polygon mirror and it did improve slightly, however it didn't go entirely.
I have to-date only changed one laser and after swapping lasers the problems goes,
so the yellow and magenta laser was the problem.

Thank you all for your contributions I really appreciate your help.

[roho]

If I'm not mistaken, the other thing common to both yellow and magenta is the bias plate found on the base of the magenta hopper. That might be worth checking out for dust, dirt, or poor contact.

[roho]

That bias plate connects to the itb assembly, providing transfer bias to the primary xfer rollers. The bias contact for cyan and K are on the bottom of the cyan hopper base.

[malwatson]

That bias plate connects to the itb assembly, providing transfer bias to the primary xfer rollers. The bias contact for cyan and K are on the bottom of the cyan hopper base.

Hi Roho,

Thanks for your contribution, do you have any diagrams or imagery pointing to this location?

[roho]

there isn't much in the manuals on this, but the best way to see is to remove the itb and shine a light in, you'll see the four hopper bases, and the plate on the middle two, magenta and cyan. These plates interconnect with the itb, the cyan plate providing bias to the cyan and k xfer, while the plate one the magenta does likewise for the magenta and yellow. I would however strongly recommend cleaning the lasers themselves as well. The lasers are in pairs, two units, however each laser unit houses two separate lasers themselves. Ive had k fail with light prints, while cyan was perfect. I would however, remove and clean the lasers also, as there is now a mod for toner getting into them. If it was a bias issue, I'd suspect the prints would be uniformly light, and the yellow and magenta lasers are more prone to toner build up due to their proximity to the itb cleaner assembly. I've removed them before in some cases of uneven density like you"ve described and cleaned the lens. They often do get very dirty. Some things to try.

[Canuck]

Usually when you lose a transfer bias or current you would see the light area across the entire length of the print, running from front to rear of the machine. This light area is at front or rear of machine, in paper feed direction. Loss of transfer current or bias would affect the whole length of the transfer roll, not just the end