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  1. #1
    The Wolf 1,000+ Posts mojorolla's Avatar
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    Bizhub 454e - need 2nd opinion

    454e with CQ issues on copy and print we have laying around the shop. I have 6 of the slower 4e units but of course none of this series.
    Have swapped drum and dv units, transfer, reseated laser and connections, firmware, the usual suspects. A panic stop shows that these density variations are occurring before the fuser.
    I am leaning towards the laser unit. From the test prints, it looks like one of the laser diodes is failing.
    Looking for a second opinion before I waste time or $$ on this older unit.
    Thanx
    1.jpg2.jpg3.jpg



    Failing to plan is planning to fail!!!

  2. #2
    Service Manager 2,500+ Posts
    Bizhub 454e - need 2nd opinion


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    Re: Bizhub 454e - need 2nd opinion

    Quote Originally Posted by mojorolla View Post
    454e with CQ issues on copy and print we have laying around the shop. I have 6 of the slower 4e units but of course none of this series.
    Have swapped drum and dv units, transfer, reseated laser and connections, firmware, the usual suspects. A panic stop shows that these density variations are occurring before the fuser.
    I am leaning towards the laser unit. From the test prints, it looks like one of the laser diodes is failing.
    Looking for a second opinion before I waste time or $$ on this older unit.
    Thanx
    1.jpg2.jpg3.jpg



    Genuine K/M Toner, Drum & Developer ?

    When you had the dev unit out did you look at laser window to see if dirty?

    If I think of anything else will post later

  3. #3
    Master Of The Obvious 10,000+ Posts
    Bizhub 454e - need 2nd opinion

    blackcat4866's Avatar
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    Re: Bizhub 454e - need 2nd opinion

    It certainly could be laser ... but I've never seen a bad KM laser unit, ever. Atypical of most of the laser issues I've addressed, it's usually not that subtle. =^..^=
    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 =^..^=

  4. #4
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    Re: Bizhub 454e - need 2nd opinion

    I've seen lasers fail, but never in a way that causes these IQ issues. Normally its mirror rotation/codes
    You've pretty much hit all the spots, but have you tried cleaning the slit glass for the laser?

  5. #5
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    Re: Bizhub 454e - need 2nd opinion

    4e series have some problems with fine dust coming into laser unit and stick to poligon mirrors but in that case ussualy density should be lower on the paper far side.
    If you already check everything else i would try to clean write unit.
    You can read this topic about that.

    C224e Print Quality Issues (Problem & Solution)

  6. #6
    The Wolf 1,000+ Posts mojorolla's Avatar
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    Re: Bizhub 454e - need 2nd opinion

    Using all OEM and I physically removed / cleaned the laser, but I did not open it. The LD printouts are what caught my interest as the LD adjustment patterns description in the manual is "wood grain", which is what I am getting. Machine runs Stabilizer in image adjustments without issue.

    Blackcat...never...? Now that is interesting.


    Failing to plan is planning to fail!!!

  7. #7
    Service Manager 2,500+ Posts tsbservice's Avatar
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    Re: Bizhub 454e - need 2nd opinion

    I have 2 failed LSUs on C224e...but they failed with different symptom - many fine lines main scan direction. But yes can be LSU.
    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.

  8. #8
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    Re: Bizhub 454e - need 2nd opinion

    This is recently problem on C258, laser could cause different error patterns.
    Top part of image is after laser cleaning and bottom is before cleaning.
    My customer describe it like paper is needleworked

    C258 laser.jpg

  9. #9
    Service Manager 2,500+ Posts tsbservice's Avatar
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    Thumbs up Re: Bizhub 454e - need 2nd opinion

    Quote Originally Posted by Toxic View Post
    This is recently problem on C258, laser could cause different error patterns.
    Top part of image is after laser cleaning and bottom is before cleaning.
    My customer describe it like paper is needleworked

    C258 laser.jpg
    Excellent work!
    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.

  10. #10
    Service Manager 1,000+ Posts
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    Re: Bizhub 454e - need 2nd opinion

    Even if it was a laser diode (which I highly doubt) you have to remember that each diode would be writing a line..If you had one not operating, or weak, you would see a greyscale checkerboard in your black areas..From my experience, the polygon mirrors do get dirty but tend to accumulate the dust on the edge of the mirrors, not the full length. I think you have another issue..I'm assuming the samples you posted are 1 from a good machine, one from you problem child and the 1/w tone from the same problem child. If a diode was bad, it would detect it during H-Sync. E

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