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  1. #1
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    Konica Minolta C3350 white spots and vertical lines in black/grey prints

    Since some time there are white dots in the prints, even visible when text is printed. Even more visible is this in grey prints. Additionally there are some lines visible, especially in grey areas. Does anyone know what the cause of these problems might be? Is it a cleaning issue or is there a part that has to be replaced? The device is used very little (~5000 pages printed). Attached scans of grey, black and cyan prints.
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  2. #2
    Master Of The Obvious 10,000+ Posts
    Konica Minolta C3350 white spots and vertical lines in black/grey prints

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    Re: Konica Minolta C3350 white spots and vertical lines in black/grey prints

    Were I to guess, I'd say that you've got label adhesive on the black drum. How it got transferred from the primary transfer belt without leaving it on the belt ... I don't know.

    The photoconductor or "drum" is an optical device. Light exposes the imaged (dark) areas of the drum, and anything stuck on the surface acts like a filter, leaving white anomalies at 96mm intervals. The lighter lines in the feed direction are probably just a dirty black laser slit glass.

    If it were me, I'd remove the imaging units, and use the wand to clean the laser slit glasses. I would then re-install the C/M/Y imaging units. Then I would clean whatever is stuck to the black drum. This is the tricky part, since the drum is inside the imaging unit, and you can only see a small part of it at a time. I would would use paraffin lamp oil to clean a small area with a cotton pad and gently wipe only (don't scrub). Then rinse with alcohol on a cotton pad. Rotate 1/10th of a rotation and repeat, until you get all the way around the drum.

    There will be residue on the drum, so you'll see a pattern that repeats at 96mm over the next 50 to 100 prints, until the drum wiper has squeegee'd off the residue.

    =^..^=
    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. #3
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    Konica Minolta C3350 white spots and vertical lines in black/grey prints

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    Re: Konica Minolta C3350 white spots and vertical lines in black/grey prints

    Quote Originally Posted by kombo2 View Post
    Since some time there are white dots in the prints, even visible when text is printed. Even more visible is this in grey prints. Additionally there are some lines visible, especially in grey areas. Does anyone know what the cause of these problems might be? Is it a cleaning issue or is there a part that has to be replaced? The device is used very little (~5000 pages printed). Attached scans of grey, black and cyan prints.

    From your samples it looks like you need to replace the image unit. These can be replaced by the end user (you)

    From personal experience attempting to clean the unit only makes the issue worse.


    Konica Minolta IUP22K Black Imaging Unit A3GP01D
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  4. #4
    Service Manager 2,500+ Posts tsbservice's Avatar
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    Re: Konica Minolta C3350 white spots and vertical lines in black/grey prints

    Agree with other guys. First remove black imaging unit and clear laser slit glass if images aren't improving replace black IU.
    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.

  5. #5
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    Re: Konica Minolta C3350 white spots and vertical lines in black/grey prints

    Thank you for your answers and ideas!

    I have tried cleaning the black opc drum with alcohol and a cotton cloth as a first step, because on inspection the white spots were visible as clots of toner that were stuck to the drum. Result is that the white spots are gone : ). If they come back after some time then i will probably replace the black imaging unit.

    Unfortunately the vertical lines are still there, in the grey prints very visible, in the cyan only very faint (see attached scans). I have wiped what i think is the laser slit glas but that looks clean, see attached photo. I was thinking that maybe the vertical lines do not originate from the opc drum, but maybe from the transfer belt? I think at some point i read that these devices are known for damagin transfer belts. I have attached a photo of the transfer belt, there are some lines visible, but i am not sure if they are responsible for what is visible in the prints. What do you think?
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  6. #6
    Master Of The Obvious 10,000+ Posts
    Konica Minolta C3350 white spots and vertical lines in black/grey prints

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    Re: Konica Minolta C3350 white spots and vertical lines in black/grey prints

    That is the laser glass that you have photographed. It's unlikely that the inside of the black laser is dirty, and the inside of the color lasers are all clean.

    It's possible that it's a developing issue ... requiring replacing the black imaging unit. =^..^=
    Last edited by blackcat4866; 1 Week Ago at 06:35 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 =^..^=

  7. #7
    Service Manager 2,500+ Posts tsbservice's Avatar
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    Re: Konica Minolta C3350 white spots and vertical lines in black/grey prints

    It's not hard to remove all toners, WTB all IUs and ITB itself. Then post a picture of whole belt.
    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: Konica Minolta C3350 white spots and vertical lines in black/grey prints

    Here are 2 photos of the transfer belt. Can you identify if this looks normal or not?
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  9. #9
    Master Of The Obvious 10,000+ Posts
    Konica Minolta C3350 white spots and vertical lines in black/grey prints

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    Re: Konica Minolta C3350 white spots and vertical lines in black/grey prints

    Quote Originally Posted by kombo2 View Post
    Here are 2 photos of the transfer belt. Can you identify if this looks normal or not?
    From what I can see, the primary transfer belt looks fine. It would affect all colors equally. =^..^=
    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 =^..^=

  10. #10
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    Re: Konica Minolta C3350 white spots and vertical lines in black/grey prints

    I think you are right, the faint vertical lines in the color prints are probably more imagination than really there. I will try and replace the black imaging unit, after that i hope the quality will improve significantly. I will give feedback after the replacement if that fixed the problem.

    Thank you for your help!!

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