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  1. #1
    Technician Keith N's Avatar
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    Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    Hi all!

    Hopefully, third time’s the charm... My first 2 posts about this disappeared.

    I'm having an issue with our C5051. A few weeks ago, after someone replaced the cyan toner, it started printing cyan and, to a lesser extent, yellow streaks on any color copies or prints. Even though we don't print much color here, it was using a LOT of cyan. To the point where it filled the waste toner container in 4 days. We normally print a few hundred pages a day here. It ran itself out of cyan toner, so I ordered some along with a cleaning blade assembly from PR as ours was at 290% life.

    I replaced the cyan toner, then the transfer cleaning blade assembly. When I took the ITB assembly out to work on the cleaning blade, there was a tremendous amount of cyan toner all over the top of the drum units. Also, there were several small chunks of what appeared to be black plastic stuck under the blade in the cleaning blade assembly. I removed those and when I upended the ITB assembly, a few more fell out. They were small curly cue shapes. I blew the excess toner out of the copier with canned air and replaced everything. When I fired it back up, everything seemed normal.

    Now I'm not getting any cyan toner output of the machine at all. I ran multiple PG10s and there is no cyan on them except for some perpendicular stripes along the bottom of the pages. The yellow is bleeding across the bottom 1/4 of the pages, which makes me think that the yellow drum may need to be replaced. But the lack of cyan toner output is confusing me. Any ideas on what I should look at here? Black copies and prints are just fine.

    As an aside, people in the office can be a little...over enthusiastic when dealing with our equipment. So I'm wondering if whoever changed the cyan toner shoved the tube in too hard and broke something?

    Any help would be greatly appreciated! Thank you!

  2. #2
    mbaublit
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    Re: Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    Have you replaced the cyan dv unit check the drive on the back they break alot

  3. #3
    Technician Keith N's Avatar
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    Re: Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    Quote Originally Posted by mbaublit View Post
    Have you replaced the cyan dv unit check the drive on the back they break alot
    First of all, thank you very much to the thread gods that got my post up! THANK YOU!

    mbaublit, thank you for your reply! Would a dev unit fail suddenly like that or would it be a more gradual process? When I slid the process unit out, it was pretty heavily covered in cyan toner. I've attached a picture (hopefully) so you can see what I was dealing with. It's so thick, you can't even see the label on the dev unit.

    Cyan toner smaller.jpg

    Is this a dev unit failure? My main concern is I don't want to throw parts at it, especially if we can eke some further life out of them.

  4. #4
    mbaublit
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    Re: Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    On the back of the developer is a little gear it's usually black and it looks like a cross every time I lost the one color or another it that spins in the mag roller doesn't move

  5. #5
    Senior Tech 250+ Posts
    Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    techandtrader's Avatar
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    Re: Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    Mbau is right. The devs have a gear on them that needs upgraded. You can use a color when they break, Thats not all that could be wrong. The Black drum is the same color as the color drums. That means they are aftermarket drums, at least the black one. You need to run the DPC drum calibrations ASAP. When the HVT and the drums are out of whack they can dump toner up on top of each other like in the pic. I seen it happen on a high speed machine just with test prints! I have seen the aft. drums work good in the low speed models. I wont use them in the highspeed models. The HVT PCB doesnt like these drums. Buy all new OEM drum units. Replace the gears and have another tech double check it.

  6. #6
    Technician Keith N's Avatar
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    Re: Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    Alright, I'll open it up as soon as I get a spare minute and will let you know what I find.

    IIRC, I had to salvage the drums out of another machine and they weren't an exact match, so I had to swap a small part on them to get it to work properly with the C5051. On the black drum though, I think I had to notch something in order for it to fit. The old machine may have been a C5035, but I don't quite remember.

  7. #7
    Senior Tech 250+ Posts
    Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

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    Re: Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    Quote Originally Posted by Keith N View Post
    Alright, I'll open it up as soon as I get a spare minute and will let you know what I find.

    IIRC, I had to salvage the drums out of another machine and they weren't an exact match, so I had to swap a small part on them to get it to work properly with the C5051. On the black drum though, I think I had to notch something in order for it to fit. The old machine may have been a C5035, but I don't quite remember.
    Its documented that what you did will cause all of this HVT toner mess. the broken gear didnt help.

  8. #8
    Tech Specialist 1,000+ Posts Canuck's Avatar
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    Re: Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    New dev propeller(lol) comes with a pin to put through the shaft. The coupling on the machine itself breaks sometimes too..

  9. #9
    Tech Specialist 1,000+ Posts Canuck's Avatar
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    Re: Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan


  10. #10
    Senior Tech 250+ Posts
    Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    techandtrader's Avatar
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    Re: Canon C5051 dumped cyan toner, replaced toner & cleaning blade, now no cyan

    This threads title is click bait. Toner dumping...sounds like the old C5800 toner /Dev dumping lol. I have replaced plenty pinned gears but still have not had to replace coupler on machine side.

    We have not seen any issues with the stop pads. Would like to see that whole PDf.

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