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  1. #1
    Senior Tech 100+ Posts kyogenius's Avatar
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    KM 2550 BLANK COPIES

    Sorry guys hv been away a while but still have my machine with the problem of blank copies, i have tried nearly everything on it on another working machine,they all fine, i mean dev unit ,drum unit,laser unit,all boards except power source pcb, all things seems working, could it be my power board, any suggestions, the best i got is a very faint image on one edge if i set all my settings on darkest.

    Could it be my dev bias, hw can i check it ,if its likely

  2. #2
    Service Manager 1,000+ Posts
    KM 2550 BLANK COPIES


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    Re: KM 2550 BLANK COPIES

    Did you replace the High Voltage board?

  3. #3
    Senior Tech 100+ Posts kyogenius's Avatar
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    Re: KM 2550 BLANK COPIES

    SURE i even tried it on another machine, its fine

  4. #4
    Service Manager 1,000+ Posts
    KM 2550 BLANK COPIES


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    Re: KM 2550 BLANK COPIES

    Go ahead with the Power Supply board. Sorry, I have to ask....it's blank on internal prints too, right? Cuz these machines have an issue with mirrors clouding up.

  5. #5
    Master Of The Obvious 10,000+ Posts
    KM 2550 BLANK COPIES

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    Re: KM 2550 BLANK COPIES

    Is there any latent developed image? I'm guessing no. =^..^=
    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 =^..^=

  6. #6
    Service Manager 1,000+ Posts
    KM 2550 BLANK COPIES


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    Very faint on the edges

  7. #7
    Master Of The Obvious 10,000+ Posts
    KM 2550 BLANK COPIES

    blackcat4866's Avatar
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    Re: KM 2550 BLANK COPIES

    So there may be a transfer or separation charge loss, but you won't know for sure until the first problem is resolved. You could have developing drive issues, but I think that's unlikely, it would affect image quality evenly in the main scan direction. Your primary charge is intact or you'd have black prints. Drum ground fault would also affect the image quality evenly in the main scan direction.

    That leaves developing bias voltage, or possibly a generic toner or wrong toner issue.

    Personally, I'm leaning towards wrong toner. Any remnants of OEM toner would remain at the far ends of the developing unit.

    Change the toner and vacuum out the developing unit. Then run U130 to refill the developing unit. Otherwise it could take several hundred pages to deplete the generic/wrong toner. =^..^=
    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 =^..^=

  8. #8
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    Re: KM 2550 BLANK COPIES

    Check the metal contacts that go from the High Voltage Board to the Transfer/Separation and Drum/Developer. They are think metal strips which are mounted to a plastic housing. I've had a flange that seats the metal strip break and there wasn't proper connection between the contact and the transfer roller.


    Contacts.pdf

  9. #9
    Senior Tech 100+ Posts kyogenius's Avatar
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    Re: KM 2550 BLANK COPIES

    thanks guys ,i hv tried nearly everything on this machine but still NO breakthrough, my only conclusion could be a broken cable or something related to wiring,however am still willing to try anything . i got a working machine beside this faulty one. what else can i try,

    any suggestion is most welcome no matter how stupid it may sound

  10. #10
    Master Of The Obvious 10,000+ Posts
    KM 2550 BLANK COPIES

    blackcat4866's Avatar
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    Re: KM 2550 BLANK COPIES

    Do internal prints come out OK? From what you've said, all that's left is wire harness and charge contacts. That's all I've got. =^..^=
    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 =^..^=

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