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  1. #1
    Senior Tech 100+ Posts
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    misalignment on C754

    Hello guys,

    i have this issue with our KM C754.

    If i print on 160gsm and setting the paper type to be thick 2, my prints are having like a shadow output. Seem like a misalignment of the colors.
    If i print on 160gsm and setting the paper type to be Plain Paper, there is no misalignment but the fuser cannot fuse properly the image on the paper. prints are peeling off and sticking on the fuser roller.

    If I print in the normal 80gsm and as plain paper, everything is well.

    So basically if i am using Thick 1 or Thick 2 as my settings for 120gsm or 160gsm, i am getting a misalignment.

    Anybody got an idea for this?

    Thanks all.

  2. #2
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    Re: misalignment on C754

    I started to have a doubt while testing this.

    I made boxes of RGB and CMY and a line of black to check which color is misaligned. It turns out that the black is the one being misaligned

    Attaching a sample.
    Attached Files Attached Files

  3. #3
    RTFM!! 5,000+ Posts allan's Avatar
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    Re: misalignment on C754

    Black is the Key color so its save to say CMY is misaligned or K is not registering.

    Check for P-codes 9, 14, 21, 22 or 31.
    Whatever

  4. #4
    RTFM!! 5,000+ Posts allan's Avatar
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    Re: misalignment on C754

    Leave the front door open and send the job, then close the door to get the print.
    I should stabilize if you close the door.
    Whatever

  5. #5
    Master Of The Obvious 10,000+ Posts
    misalignment on C754

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    Re: misalignment on C754

    It looks like a drive issue to me. The black line faintly appears corner to corner, then is stretched toward the trailing edge. I think that I'd look at the black drum drive.

    If all of the colors were affected perhaps a minor adjustment of fuser speed might fix this for you. Lighter weight papers will be more forgiving. =^..^=
    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 5,000+ Posts
    misalignment on C754

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    Re: misalignment on C754

    What have you done so far, initialise + stabilisation ? Cleaned the patch sensors?

    What are the life of your ITB & IU's?

    The machine makes various changes depending on the paper weight settings.

    9/10 a colour mis-registration issue is caused by the ITB.
    Let us eat, drink, and be merry, because tomorrow we may die!

    For all your firmware & service manual needs please visit us at:

    www.copierfirmware.co.uk - www.printerfirmware.co.uk




  7. #7
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    Re: misalignment on C754

    Quote Originally Posted by allan View Post
    Black is the Key color so its save to say CMY is misaligned or K is not registering.

    Check for P-codes 9, 14, 21, 22 or 31.

    Goodpoint, yes black could be the reference for the other color.

    I don't see any P-Codes showing up in the screen of the copier.

  8. #8
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    Re: misalignment on C754

    Yes i have done initialize + stablization, also the gradation adjustment. Prior to that, i took out the sensor assembly to clean fully, paper path all the way to the fuser. My primary doubt right now is with the ITB Unit, especially the black primary transfer inside, too bad i cannot open and clean it, replaceable by whole. Next to it i'm doubting the drive of the Black DV and/or drum.

    Checking the consumables status, the ITB unit seems like was not replaced since purchase. It still has 25% left but the count is 924k. Drum units are still half of the percentage.

    Could this issue be from the ITB? Is there anyway to open up the ITB unit for me to clean and check inside? I'd like to try before purchasing a new one.
    There is no instructions in the manual.

  9. #9
    RTFM!! 5,000+ Posts allan's Avatar
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    Re: misalignment on C754

    as per BC check the fuser speed.
    Whatever

  10. #10
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    Re: misalignment on C754

    Hi Allan, may i know what "BC" is?

    Are u referring to the Fuser speed in Service mode>>Machine>>Fusing Transport Speed?

    I cant seem to modify it. Plain Paper is -10, Thick 1 is 20, Thick 2 to 4 is 10.

    Just an update - i have been printing the sample in succession with no changes of any settings and i noticed that the misalignment are not consistent.
    There is a portion where misalignment is less, more and some portion where almost aligned.
    Attached Files Attached Files

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