Can I get help diagnosing this based on these images? C250

Discussion in 'Konica Minolta Color Laser Printers & Copiers' started by jozef, Apr 25, 2011.

  1. jozef

    jozef New Member

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    Hi, this Konica Bizhub C250 prints with "waves" in Cyan mostly. The waves or ripples are sort of where the color is missing in white diagonal regions. Can someone look at these and give me some indication about what's wrong with it? I have the service manual for it too. Sometimes blue almost looks like it has some pink in it. Unit is not calling for replacement of any consumable at this time. Waste toner cartridge seems a little heavy but no error messages.

    I'd be grateful for any help. I'm thinking this may not be hard for someone with more experience. Thank you.
     

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  2. Michael4

    Michael4 Senior Member

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    I haven't seen an issue like this is some time. I thought for a moment the wires that charge the cyan toner roller (you have one for each color) was perhaps burned out. But you wouldn't get consistent diagonals like this.

    Have you examined the fuser roller? perhaps you have something adhered to the roller , or the roller/blanket itself is damaged.
    With marks like these you should be able to notice something quite easily if the roller is blemished.

    I don't believe it's an issue with the toner or toner waste at all. And Konica doesn't use an ITB , at least my 6501 didn't not use one...

    Please look at the fuser roller and any other visible roller for marks or blemishes , and let me know what you find..
     
  3. jozef

    jozef New Member

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    Thanks for your note. I didn't see anything noticeable there. But, this doesn't appear on anything other than cyan or colors that use cyan like purple or green. So, can I assume it's only about the Cyan imaging unit?
     
  4. Michael4

    Michael4 Senior Member

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    You are right.

    the fusing unit would affect all color. There must be something wrong with the Cyan transfer roller. The machine i use now has 4 easy to locate rollers for each toner color. Each roller has a wire to receive its charge, and a shield to protect the wire. These rollers apply toner to an ITB, which in turn applies it the paper..

    I'm not sure how your model works , but it has to be something with that Cyan unit, whatever your machines design may be
     
  5. jozef

    jozef New Member

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    Thanks.
    I'm understanding it needs a new CYAN imaging unit. They're really pricey at $400+. Each color has its own imaging unit with drum. I wish I could just be certain before suggesting this purchase. But, I have nothing to swap it out with. I'm looking for the lowest cost one I can source or even better, a rebuild kit, but I don't think they exist for this IU210C for bizhub 250C.
     

  6. kmden

    kmden Member

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    You are correct...it is the Cyan IU. The reason it's doing it is because it is low in developer, hence the diagonal lines as it agitates. If you can get some dev, you can put it into the IU, just remember that the IU still has a life span. Also, if you put in too much, you may get an error code.
     
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