xerox DC 242 copy quality on black

Discussion in 'Xerox Color Laser Printers & Color Copiers' started by Chrisio1977, Apr 12, 2019.

  1. Chrisio1977

    Chrisio1977 Member

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    Hi.

    Got an annoying issue with black at the minute and that is I am getting lighter streaks down the length of the paper on solid blacks / grays.

    The drum is 74% and was changed due to this problem and the old one had around 25% life remaining. The dev and dev housing are new.

    Its not that noticeable in anything other than printing full coverage black or gray when it stands out like a sore thumb!

    Does anyone have any bright ideas?

    attached is a scanned pdf

    Cheers
    Chris
     

    Attached Files:

  2. Biggs

    Biggs Senior Member

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    The thin lines in the print direction looks like a bad corona/charge wire. Or a dirty grid.
    The over all poor saturation (especially if it's an uncoated media) looks like insignificant transfer voltage and/or fuser temperature
     
  3. OkiTech

    OkiTech Senior Member

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    Corona / Primary Charge Unit is part of the Drum cartridge, I think. If not - probably a #1 source of this issue, if it is part of the new drum cartridge, look at your fuser unit. take the fuser unit out and align this page with fuser's mouth, see if flawed "Lines" will align with flaws on upper or lower fuser rollers.
     
  4. Chrisio1977

    Chrisio1977 Member

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    Thanks both. I will check the fuser and report back however the defects do not appear in any other colour apart from black.

    Thanks
     
  5. Biggs

    Biggs Senior Member

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    Part of feels the same way about the imaging unit being an one-part/all-in-one replacement. I’m sure of it on the C60/70. I’ll have to look this up.
     

  6. OkiTech

    OkiTech Senior Member

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    Ok, 3 more theories then:
    #1) it is your ITB belt. How many copies on it? It would be hard to see the condition/level of contamination of a transfer roller under the Drum but that could be the issue.
    #2) check if laser slit glass is clean- there should be a wand that you can slide in and out to clean it.
    #3) check if flaws on printed page align with any of the rollers past fuser. I mean the plastic/hard rubber rollers that drive paper out. Phaser 7500/7800 and previous models were notorious to leave sort of impression on dense areas from eject rollers. They would get really hot and gloss up toner more then areas next to them..
     
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