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  1. #21
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    Re: KM 4050 light prints and copies on one end

    Looks Transfer Roller Holder is broken on that side

  2. #22
    Service Manager 5,000+ Posts
    KM 4050 light prints and copies on one end

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    Re: KM 4050 light prints and copies on one end

    The OP said he could see the void area on the latent image. That would eliminate any transfer issues. I would check the charge assembly being misaligned like blackcat suggested.

  3. #23
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    Re: KM 4050 light prints and copies on one end

    My photo may not have been the best example. I coped a peace of black plastic sheet. The white edge is not the issue it is the front where it gets light and you can see lines. I have attached a close up of what I am talking about.

    IMG_6270.jpg

  4. #24
    Master Of The Obvious 10,000+ Posts
    KM 4050 light prints and copies on one end

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    Re: KM 4050 light prints and copies on one end

    Bad news: that's the laser. =^..^=
    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.
    3) if you're going to ask about jams include the jam code.
    4) if you're going to ask about an error code include the error code.
    5) You are the person onsite. Only you can make observations.

    blackcat: Master Of The Obvious =^..^=

  5. #25
    Service Manager 1,000+ Posts
    KM 4050 light prints and copies on one end


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    Re: KM 4050 light prints and copies on one end

    Polygon mirror, clearly, as tsbservice said a while ago. This is a common problem.

    You will see a "fog" on one end of each mirror face. Kind of like how a ceiling fan develops dirt on only one side because that's the side to cut into the air.

    Thus the light area is only on the bottom of the page.

    The only cost to you is some disassembly and a dab of alcohol.

  6. #26
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    Re: KM 4050 light prints and copies on one end

    Thank you to everyone that commented.
    I suspected it was the laser now I just need to figure out how to remove it. I can not fine disassembly instructions for it anywhere

  7. #27
    Service Manager 5,000+ Posts
    KM 4050 light prints and copies on one end

    BillyCarpenter's Avatar
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    Re: KM 4050 light prints and copies on one end

    Quote Originally Posted by blackcat4866 View Post
    Bad news: that's the laser. =^..^=

    I'm curious how you know it's the laser? Is it the lines on the page?

  8. #28
    Master Of The Obvious 10,000+ Posts
    KM 4050 light prints and copies on one end

    blackcat4866's Avatar
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    Re: KM 4050 light prints and copies on one end

    Quote Originally Posted by BillyCarpenter View Post
    I'm curious how you know it's the laser? Is it the lines on the page?
    I've seen this a few times on other manufacturers, other models, most recently Toshiba e Studio 4505AC. What made it particularly easy to diagnose was the fact that it only affected black images, in three cases:

    4505AC Sample2.JPG4505AC Sample1.JPG

    =^..^=
    Last edited by blackcat4866; 12-12-2020 at 12:48 AM.
    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.
    3) if you're going to ask about jams include the jam code.
    4) if you're going to ask about an error code include the error code.
    5) You are the person onsite. Only you can make observations.

    blackcat: Master Of The Obvious =^..^=

  9. #29
    Master Of The Obvious 10,000+ Posts
    KM 4050 light prints and copies on one end

    blackcat4866's Avatar
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    Re: KM 4050 light prints and copies on one end

    Quote Originally Posted by JR2ALTA View Post
    Polygon mirror, clearly, as tsbservice said a while ago. This is a common problem.

    You will see a "fog" on one end of each mirror face. Kind of like how a ceiling fan develops dirt on only one side because that's the side to cut into the air.

    Thus the light area is only on the bottom of the page.

    The only cost to you is some disassembly and a dab of alcohol.
    The dirty polygon mirror(s), in my experience, present at overall very light prints and copies, sometimes including laser codes (the machine attempts to overcome the dirt by increasing the intensity of the laser diode, unsuccessfully), though it doesn't hurt to check and/or clean the mirror surfaces (use very soft cloth, scratches easily):

    image.jpgimage.jpg
    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.
    3) if you're going to ask about jams include the jam code.
    4) if you're going to ask about an error code include the error code.
    5) You are the person onsite. Only you can make observations.

    blackcat: Master Of The Obvious =^..^=

  10. #30
    Service Manager 1,000+ Posts
    KM 4050 light prints and copies on one end


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    Re: KM 4050 light prints and copies on one end

    Quote Originally Posted by blackcat4866 View Post
    The dirty polygon mirror(s), in my experience, present at overall very light prints and copies, sometimes including laser codes (the machine attempts to overcome the dirt by increasing the intensity of the laser diode, unsuccessfully), though it doesn't hurt to check and/or clean the mirror surfaces (use very soft cloth, scratches easily):

    image.jpgimage.jpg
    The picture you provide is very dirty. I think the customer tolerated light image on the bottom of the page until the whole page got lighter. But as you can see the greater build up is still on one edge, though, making the bottom of the page lighter than the rest.

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