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  1. #1
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    Post KM C258 offsetting issue

    Hi guys,
    I encountered an issue with a KM C258 arround 100k (40k black)
    Looks like an black eraser assembly issue but not sure (monochromy in cyan, magenta and yellow ok).
    First half of the sheet, everything is fine but the second half has an offsetting issue.
    Had tried a new black drum and transfer belt but still happening.
    Any idea before i disassemble that innocent machine ?

    Attached Files Attached Files

  2. #2
    Service Manager 2,500+ Posts
    KM C258 offsetting issue

    Phil B.'s Avatar
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    Re: KM C258 offsetting issue

    Quote Originally Posted by JDR View Post
    Hi guys,
    I encountered an issue with a KM C258 arround 100k (40k black)
    Looks like an black eraser assembly issue but not sure (monochromy in cyan, magenta and yellow ok).
    First half of the sheet, everything is fine but the second half has an offsetting issue.
    Had tried a new black drum and transfer belt but still happening.
    Any idea before i disassemble that innocent machine ?
    could be a LSU. Seen that on Ricoh and Color HPs


  3. #3
    Aging Tech 1,000+ Posts
    KM C258 offsetting issue


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    Re: KM C258 offsetting issue

    Have you tried using a thick paper setting? Even if it isn't thick paper the density of the toner could be causing the problem. Just a thought.


  4. #4
    Service Manager 1,000+ Posts
    KM C258 offsetting issue

    Synthohol's Avatar
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    Re: KM C258 offsetting issue

    does look like an erase lamp failure, but it may be fuser?
    if fuser has the offset image there is this advice...
    Error
    Image is offset during fusing.

    Root Cause
    Firmware requires updating.

    Workaround/Fix
    Install special firmware GC2-E1 and set newly created Engine FW DipSW 13 by performing the following procedure.
    1. Enter Service Mode
    2. Utility/Stop/00/Stop/01
    3. Enter Enhanced Security
    4. Stop/0/Clear
    5. Engine FW DipSw
    6. Highlight Engine FW DipSw 13
    7. Back out of Service Mode and Turn OFFMain Power Switch

    Please consider contributing to this site if you want me to share files for free.

  5. #5
    Master Of The Obvious 10,000+ Posts
    KM C258 offsetting issue

    blackcat4866's Avatar
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    Re: KM C258 offsetting issue

    96mm interval is most certainly a drum. The laser is responsible for drum cleaning and imaging, so if you have one you must necessarily have the other. But there might be a drum grounding or drum memory issue. Almost certainly the black drum will solve your issue. =^..^=

    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.


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

  6. #6
    Senior Tech 100+ Posts tsbservice's Avatar
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    Re: KM C258 offsetting issue

    In fact topic starter said he replaced black drum. As fusing pressure roller and drums have same pitch interval of 94mm, i would stay with Synthohol on this one.

    Never argue with an idiot. They will drag you down to their level and beat you with experience.

  7. #7
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    Re: KM C258 offsetting issue

    thanks guys for all your replies.
    I have already replaced drum and transfer belt and tried with another fuser (just in case).
    I though about erase led but LSU seems to be a good idea.
    I gonna try this out.


  8. #8
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    Re: KM C258 offsetting issue

    Here what i can report to you :
    I have tried to replace erase LED, LSU, ITB, Black drum, black developper, fuser, FRB... and the issue still occurs.
    Even tried a self check diag where everything is OK (except 2nd dimm error).
    Dunno what to do realy except a data clear...


  9. #9
    Service Manager 1,000+ Posts
    KM C258 offsetting issue

    Synthohol's Avatar
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    Re: KM C258 offsetting issue

    Not for nothing, I have seen issues like this when the file has layers and is not flattened properly and the underlying image still shows up.
    Does it do it with every job or just this one?
    Print the built in demo page a few times. Lots of black there and let's see if it repeats like your attachment.

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  10. #10
    Field Supervisor 500+ Posts
    KM C258 offsetting issue


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    Re: KM C258 offsetting issue

    The odd thing to me is that it appears that the white lettering (paper surface) is what is being shadowed with toner later on the page. It's not like it's a toner repeat. It's more of a negative shadow. I can't figure a good explanation for this one.


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