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  1. #11
    Field Supervisor 500+ Posts B0265's Avatar
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    Re: C250i No yellow on rear side of page

    Quote Originally Posted by copier tech View Post
    Is the yellow drum & DV unit racked into contact with each other correctly? Looks like they not racked in evenly, check the rear locking arm etc.
    It's difficult to see if the drum and dev units are in contact in the rear side but the dev unit release arm looks fine as far as we can see.

  2. #12
    Service Manager 5,000+ Posts tsbservice's Avatar
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    Re: C250i No yellow on rear side of page

    Quote Originally Posted by B0265 View Post
    The coating on the developing roller looks fine, it's even all over the surface.
    I have never stopped the machine during printing and tried to pull out a color drum when the 1st transfer roller is in the down position, can this be done without any damage?
    Yes drum can be pulled.
    A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.

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  3. #13
    Service Manager 1,000+ Posts Gift's Avatar
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    Re: C250i No yellow on rear side of page

    Haven't read the whole story here but did you try and interrupt the print process (open cover during printing) and check the image on the drum/itb surface?

  4. #14
    Field Supervisor 500+ Posts B0265's Avatar
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    Re: C250i No yellow on rear side of page

    Quote Originally Posted by Gift View Post
    Haven't read the whole story here but did you try and interrupt the print process (open cover during printing) and check the image on the drum/itb surface?
    Not me personally but P8 & P21 is shown all the time so I'm pretty sure the yellow image is missing on the transfer belt.

  5. #15
    RTFM!! 5,000+ Posts allan's Avatar
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    Re: C250i No yellow on rear side of page

    Could also be a broke part on the TBU that press the primary transfer roller down. So hope stopping the machine and pulling the drum could help a bunch.
    You did mention changing the TBU.

    Under service mode try to adj the primary transfer current to both extents and see if it will do more or less than that 6cm. Its not to far fetched to be a HV current leakage.
    Whatever

  6. #16
    Service Manager 1,000+ Posts Gift's Avatar
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    Re: C250i No yellow on rear side of page

    Quote Originally Posted by B0265 View Post
    Not me personally but P8 & P21 is shown all the time so I'm pretty sure the yellow image is missing on the transfer belt.
    Well I think checking with your own eyes is better than believing, especially if it's not a big effort to take a look. If the toner-image is fully there on the drum surface but only partially transfered on the belt you probably have an issue with it's inner parts (yellow 1st transfer roller).

  7. #17
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    Re: C250i No yellow on rear side of page

    Did you try to mark developing roller position and check after print does it moved?

  8. #18
    Field Supervisor 500+ Posts
    C250i No yellow on rear side of page

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    Re: C250i No yellow on rear side of page

    You can do a test on an A3 or 11x17 sheet, with 100% coverage in yellow and during the process of transferring the drum to the ITB, you open the front cover to stop the process. At this moment, analyze the drum and the ITB
    Nothing like day after day

  9. #19
    Field Supervisor 500+ Posts Woxner's Avatar
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    Re: C250i No yellow on rear side of page

    my two cents is the itb roller is not sitting down on drum. i have seen these break and do this

  10. #20
    Trusted Tech 50+ Posts
    C250i No yellow on rear side of page


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    Re: C250i No yellow on rear side of page

    Quote Originally Posted by Woxner View Post
    my two cents is the itb roller is not sitting down on drum. i have seen these break and do this
    Do you mean primary roller? The OP said he changed the yellow drum and transfer belt, which kind of rules that out. I think this needs more investigation, stopping mid print on an A3 255 half tone test would be a good start.

    Id be interested to hear what cures this issue!


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