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  1. #1
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    Post Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

    Hello Everyone,

    We have a Konica Minolta Bizhub C759 and having a problems with the print outs, with red/magenta shadows double/ghost prints. The problems only appears when we print on a 11x17" size paper but for a 8x11" the prints are good. You can print one at a time and they will all look good. But print like 10 or more and the first few will look good and then the rest will start to double/ghost. Please see below for sample prints:

    20200326120829.pdf 20200326115404.pdf


    The KM Bizhub C759: 2 years old
    Total Counter: 86,730
    The fusing unit is new
    the 3 imaging units and drum are new CMYK

    Did perform the Image Stabilization Only, Image + Stabilization, Print Skew Reset, and Color Registration Adjust but to no avail.

    I appreciate the help.

  2. #2
    Service Manager 1,000+ Posts
    Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.


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    Re: Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

    Quote Originally Posted by RUSORIZO View Post
    Hello Everyone,

    We have a Konica Minolta Bizhub C759 and having a problems with the print outs, with red/magenta shadows double/ghost prints. The problems only appears when we print on a 11x17" size paper but for a 8x11" the prints are good. You can print one at a time and they will all look good. But print like 10 or more and the first few will look good and then the rest will start to double/ghost. Please see below for sample prints:

    20200326120829.pdf 20200326115404.pdf


    The KM Bizhub C759: 2 years old
    Total Counter: 86,730
    The fusing unit is new
    the 3 imaging units and drum are new CMYK

    Did perform the Image Stabilization Only, Image + Stabilization, Print Skew Reset, and Color Registration Adjust but to no avail.

    I appreciate the help.
    Sorry don't know that model but with my Kon/Min experience just a few things come to mind.

    When you are saying the IU's, Drum and fuser are new why would you have had to replace them with only 86K clicks? If it didn't have such a low meter I would say you had a bad magenat IU / drum. or possibly transfer belt! I've seen that on other Kon/Mins and it was dirty IDC sensors under trans belt. Usually with P codes.

    You probably already have the attached from service manual but just in case.
    Attached Files Attached Files
    Last edited by copyman; 03-26-2020 at 04:15 AM.

  3. #3
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    Re: Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

    Quote Originally Posted by copyman View Post
    Sorry don't know that model but with my Kon/Min experience just a few things come to mind.

    When you are saying the IU's, Drum and fuser are new why would you have had to replace them with only 86K clicks? If it didn't have such a low meter I would say you had a bad magenat IU / drum. or possibly transfer belt! I've seen that on other Kon/Mins and it was dirty IDC sensors under trans belt. Usually with P codes.

    You probably already have the attached from service manual but just in case.

    Our techs replaced for a new IU's, Drum and fuser to check if the problem will be solve but still same problem occurred with no P codes showing. Our techs is having hard time to figure out the problem.

  4. #4
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    Re: Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

    Quote Originally Posted by RUSORIZO View Post
    Our techs replaced for a new IU's, Drum and fuser to check if the problem will be solve but still same problem occurred with no P codes showing. Our techs is having hard time to figure out the problem.
    I would definitely clean the idc sensors before doing any any other adjustments.

    I have had a similar fault to this which only affected a3 size paper and adjusting the fuser speed cured it.

  5. #5
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    Re: Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

    Had this on a c552 long time ago. Skew reset twice and after a initialisation/stabilisation was a temp. solution. There was a tech bulletin to replace all IU's and the black drum also.

    But check the IDC first. Its special that you doesn't have p codes.

  6. #6
    Master Of The Obvious 10,000+ Posts
    Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

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    Re: Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

    I can't remember where I've seen this before, but I have.

    The color registration starts at the leading edge of the page correctly, but gets worse the longer the page runs. Notice that the yellow registration is the worst, magenta not quite as bad (but more visible because it's magenta), and cyan the least affected.

    I suspect that you'll find some bind or drive failure in the primary transfer drive, slowing the belt slightly.
    =^..^=

    After checking the database, I've seen variations of color registration on the KM color presses because of worn 2nd transfer or worn registration roller.
    Last edited by blackcat4866; 03-26-2020 at 01:54 PM.
    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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    Re: Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

    what thickness paper are you using and what are tray settings

    have you tried cutting down paper to a4 size as it may be the stock

    have you stopped copy process and looked at image on belt is that disformed

  8. #8
    Service Manager 1,000+ Posts tsbservice's Avatar
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    Re: Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

    Check fusing loop sensors actuator springs and registration sensor springs. Reform or replace if necessary.
    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.

    Blessed are they who can laugh at themselves, for they shall never cease to be amused.

  9. #9
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    Re: Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

    on the old c552 c452 the sensor under the fuser plate snapped and caused same fault after about half the page as fuser went into a slower drive speed

  10. #10
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    Re: Help. Konica Minolta Bizhub C759 double/ghost prints on 11x17 only.

    I appreciate all of your advise. Our techs will try each every one of you guys suggestions. I will let you know the outcome.
    Again, thank you so much for the help.

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