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  1. #11
    Technician konicavod's Avatar
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    Re: Konica Minolta bizhub C258 image quality problem

    Quote Originally Posted by Ihar View Post
    cann't see Drum Unit count life status.
    you can use web interface for it.

  2. #12
    Master Of The Obvious 10,000+ Posts
    Konica Minolta bizhub C258 image quality problem

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    Re: Konica Minolta bizhub C258 image quality problem

    Quote Originally Posted by BillyCarpenter View Post
    I was examining the transfer belt for a Kyocera the other day and I noticed that it has 4 primary charge rollers. I assumed that is for the purpose of charging the upper length of the belt. It appears that would be incorrect. Let me take a guess.

    The individual colors need a different charge on the belt because of the different properties of each color toner? Just a guess.
    Sorry, no. Each primary transfer roller transfers the single color image CMYK from each drum to the primary transfer belt. There is a mechanism to lift the CMY primary transfer rollers away from the drum when black only images are being made. On every machine I've ever worked on the (4) primary rollers are identical. There are other rollers called "facing rollers" that tension the belt.
    =^..^=
    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 =^..^=

  3. #13
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    Re: Konica Minolta bizhub C258 image quality problem

    Replacing the Drum Unit gave a result. Left one is before replacing - right one is after.
    befAft.jpg

  4. #14
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    Question Re: Konica Minolta bizhub C258 image quality problem

    Hi,this is interesting, i have the exact same problem with a 308 since yesterday.After I have done all the standard things, even change ITB, DV Units looking good, the following happens when changing the drum ..... see pictures ......
    Before with stripes and dots, then still dots, at the moment I can't get any further .....

    And another interssting thing, the old Drums looking good as well,
    stripes also go partly diagonally

    There have been reports of a blown HV plastic block near the drive. Can that be?
    Any Idea ?

    mfg Markus

    befor.jpgafter.jpg

  5. #15
    Senior Tech 250+ Posts
    Konica Minolta bizhub C258 image quality problem


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    Re: Konica Minolta bizhub C258 image quality problem

    Quote Originally Posted by Ihar View Post

    How can i see the drum units count?

    bit switch 227 hex 00

  6. #16
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    Re: Konica Minolta bizhub C258 image quality problem

    Quote Originally Posted by konicavod View Post
    you can use web interface for it.
    I used web interface, but there were only information about toner cartridge count and life.


    Quote Originally Posted by CP-1015 View Post
    bit switch 227 hex 00
    Bit swich where? In firmware? I don't understand your post.

  7. #17
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    Re: Konica Minolta bizhub C258 image quality problem

    Quote Originally Posted by fornerm View Post
    Hi,this is interesting, i have the exact same problem with a 308 since yesterday.After I have done all the standard things, even change ITB, DV Units looking good, the following happens when changing the drum ..... see pictures ......
    Before with stripes and dots, then still dots, at the moment I can't get any further .....

    And another interssting thing, the old Drums looking good as well,
    stripes also go partly diagonally

    There have been reports of a blown HV plastic block near the drive. Can that be?
    Any Idea ?

    mfg Markus

    befor.jpgafter.jpg
    Have you changed drum unit with the new one or replacing with the another color drum? Your second image looks like my first (before).

  8. #18
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    Re: Konica Minolta bizhub C258 image quality problem

    Change with new one. On Magenta ist the same ...... Yellow ist ok, a little bit with dots, but without stripes....

  9. #19
    Junior Member TiBa's Avatar
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    Re: Konica Minolta bizhub C258 image quality problem

    Quote Originally Posted by Ihar View Post
    Have you changed drum unit with the new one or replacing with the another color drum? Your second image looks like my first (before).

    please also think of the development unit ... these could be used up

  10. #20
    Service Manager 1,000+ Posts femaster's Avatar
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    Re: Konica Minolta bizhub C258 image quality problem

    Quote Originally Posted by fornerm View Post
    Hi,this is interesting, i have the exact same problem with a 308 since yesterday.After I have done all the standard things, even change ITB, DV Units looking good, the following happens when changing the drum ..... see pictures ......
    Before with stripes and dots, then still dots, at the moment I can't get any further .....

    And another interssting thing, the old Drums looking good as well,
    stripes also go partly diagonally

    There have been reports of a blown HV plastic block near the drive. Can that be?
    Any Idea ?

    mfg Markus

    after.jpg
    While I've not experienced this on an Cxx8 series yet, the dots you are seeing on the after sample look exactly like the dots I've seen on a few C552's when the ITB is used well beyond it's life. Junk builds up on the roller(s) under the belt and causes those spots. Replacing the belt has fixed the issue for me every time.

    Now I see that you indicate you have already replaced the ITB. Was the new ITB installed when you created the second image above after changing out the drum? The magenta streaking on the bottom of that sample is also a bit disconcerting.
    A Ricoh Service Tech for 7 year. A Konica Minolta Service Tech for 7 years. Now, KM service manager for 3 years.
    My Ricoh knowledge is slowly dwindling away at this point. Many things have been lost to time...

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