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  1. #11
    Trusted Tech 50+ Posts kopirmaster's Avatar
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    when you change wire,do you get back plastic screew on charge corona,or you back metal screew,maybe this is your problem

  2. #12
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    Re: MP7500 black copies

    I have the same problem erratically, without a fault code.
    I've made the following attempts diagnostic
    I changed the corona charging by the crown of another machine
    I changed the power supply unit revealing
    I changedthe power of load
    Ground the drum by hand with temporary wire cun

    But the failure continues

  3. #13
    Field Supervisor 500+ Posts
    MP7500 black copies

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    Re: MP7500 black copies

    You always said black "copies", how about the prints? Do a counter print, how does it look like?

    To estimate, if the error is charge related or laser related, tape a part of the dust proof glass with black tape, is the sheet still completly black?
    If sometimes you feel a little useless, offended and depressed always remember that you were once the fastest and most victorious sperm of hundreds of millions!

  4. #14
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    Re: MP7500 black copies

    The impression is black, on copy mode or printing mode.
    Including printing of the counter.

    Thanks for replying

  5. #15
    Field Supervisor 500+ Posts
    MP7500 black copies

    Herrmann's Avatar
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    Re: MP7500 black copies

    ok, then do the "glass trick" as i described and see, what happens
    If sometimes you feel a little useless, offended and depressed always remember that you were once the fastest and most victorious sperm of hundreds of millions!

  6. #16
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    Re: MP7500 black copies

    Thanks for the answer

    'll try this

  7. #17
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    Re: MP7500 black copies

    After the test confirmed that the flaw comes from the laser.
    Already checked the cables, to no avail.
    Now I'm hoping to get a laser and a BCU to continue.

    Regards

  8. #18
    just one copy?? 500+ Posts
    MP7500 black copies

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    Re: MP7500 black copies

    Quote Originally Posted by Herrmann View Post
    ok, then do the "glass trick" as i described and see, what happens
    Thats a nice trick ya got there Hermann. I'll use that one day. +.
    I have not failed. I've just found 10,000 ways that won't work. ~Thomas Edison

  9. #19
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    Re: MP7500 black copies

    After more than 30 days the machine donīt failed again, the problem was solved by replacing a portion of the wiring harness of the laser.
    Apparently, the harness had a false-contact producing Black copies.

    Thanks for your cooperation in resolving the problem

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