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  1. #1
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    Canon C255 Image issues

    Hi

    We have had an ongoing issue which we have been unable to solve.(see attached pics). Originally we thought it was the laser so we changed the laser, no change. On canons advice we change the main drive unit but no difference to the image.

    Machine boots up ok. No error or alarm codes but machine not setting up laser correctly. Vertical scan can be adjusted ok but horizontal scan can not be adjusted, makes no difference. So theres a magenta line I cannot get rid of.PG test page 6

    Any ideas?

    TIA

    John
    Attached Images Attached Images

  2. #2
    Senior Tech 250+ Posts
    Canon C255 Image issues

    GIUBOSS's Avatar
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    Re: Canon C255 Image issues

    main drive ?? Why didn't you think about the magenta drum unit, for example, as we talk about this?

  3. #3
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    Re: Canon C255 Image issues

    Thanks for your response. We have changed the drum and swapped the following parts from a donor machine:-

    Main controller, ITB ,DC controller, HVT high and low voltage

    Bit stumped with this one

  4. #4
    Copier Technician 250+ Posts
    Canon C255 Image issues

    mga's Avatar
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    Re: Canon C255 Image issues

    Quote Originally Posted by tbsl View Post
    Thanks for your response. We have changed the drum and swapped the following parts from a donor machine:-

    Main controller, ITB ,DC controller, HVT high and low voltage

    Bit stumped with this one
    Why would you think the problem would be a board.

  5. #5
    Service Manager 5,000+ Posts
    Canon C255 Image issues

    Phil B.'s Avatar
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    Re: Canon C255 Image issues

    Quote Originally Posted by tbsl View Post
    Hi

    We have had an ongoing issue which we have been unable to solve.(see attached pics). Originally we thought it was the laser so we changed the laser, no change. On canons advice we change the main drive unit but no difference to the image.
    Machine boots up ok. No error or alarm codes but machine not setting up laser correctly. Vertical scan can be adjusted ok but horizontal scan can not be adjusted, makes no difference. So theres a magenta line I cannot get rid of.PG test page 6
    Any ideas? TIA John
    Hey John,

    are the samples in LEF or SEF feed?

    jpg's really don't give us a good view of it. uploading samples in PDF format is much preferred.

    +1 on mga's advise... not likely related to a board

    did you run the alignment process?

    can you measure the distance between marks? compare to defect ruler in SM to find which part is culprit.

    you didn't swap the developer unit(s)?

  6. #6
    Senior Tech 100+ Posts onlyinnewfoundland's Avatar
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    Re: Canon C255 Image issues

    Quote Originally Posted by tbsl View Post
    Hi

    We have had an ongoing issue which we have been unable to solve.(see attached pics). Originally we thought it was the laser so we changed the laser, no change. On canons advice we change the main drive unit but no difference to the image.

    Machine boots up ok. No error or alarm codes but machine not setting up laser correctly. Vertical scan can be adjusted ok but horizontal scan can not be adjusted, makes no difference. So theres a magenta line I cannot get rid of.PG test page 6

    Any ideas?

    TIA

    John
    If you go under settings/reg > management settings > there is a spot to initialize all data. Try that. I have had a few new 3rd gen adv do weird stuff out of box.

    Does auto correct color mismatch work?

  7. #7
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    Re: Canon C255 Image issues

    Quote Originally Posted by tbsl View Post
    Thanks for your response. We have changed the drum and swapped the following parts from a donor machine:-

    Main controller, ITB ,DC controller, HVT high and low voltage

    Bit stumped with this one
    Was it the whole drum unit you changed or just the cylinder? Have you thoroughly cleaned: scanner mirrors, laser mirrors and ATR sensors?
    Just as has been said, you are going too far with replacing HVT, DC Controller and ITB. You are not having a blank or even a fading copy.

  8. #8
    Technician Copylady72's Avatar
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    Re: Canon C255 Image issues

    Quote Originally Posted by tbsl View Post
    Thanks for your response. We have changed the drum and swapped the following parts from a donor machine:-

    Main controller, ITB ,DC controller, HVT high and low voltage

    Bit stumped with this one
    Have you cleaned the registration patch sensors?

    Sent from my SM-N950U using Tapatalk

  9. #9
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    Re: Canon C255 Image issues

    thanks for all the replies. Due to the corona virus issue another engineer took this job on and replaced the DC controller and it fixed the issue. Not sure how/why but at least it's fixed

  10. #10
    Senior Tech 250+ Posts MunsterTech's Avatar
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    Re: Canon C255 Image issues

    hi,
    in the previous thread, you said you had already replaced the DC controller, now another engineer replaced the DC again? Dont understand that

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