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  1. #1
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    bizhub 421 poor printing output

    gday guys

    our bizhub 421 printer is printing documents and missing a section of ink about a quarter down the page

    so on a particular page youll see a white line horizontally across an A4 sheet about a centimeter thick

    ive sprayed the inside of the printer out with circuit board spray and tried to get the crap off the rollers, it hasnt helped

    not sure what else to do, any ideas?


  2. #2
    Field Supervisor 500+ Posts
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    Re: bizhub 421 poor printing output

    Scan in and post an image, and tell us feed direction. Always helpful. Could be a Dev unit.


  3. #3
    Senior Tech 250+ Posts Woxner's Avatar
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    Re: bizhub 421 poor printing output

    could be dirty t corona, charge corona or blank spot in dev unit. transfer corona tend to blank out on these esp when dirty. they wont code until they short complety for 5 times in a row.


  4. #4
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    Re: bizhub 421 poor printing output

    thanks guys

    we actually have another clone of this 421 printer in the shed

    i could swap bits off it, which is what i did with the big fusing unit when the faults started occurring

    i really dont know what your talking about with components, but if could lead me to a few links that would be brilliant

    its the weekend im only here at work for a half hour but by tuesday can reply thoroughly

    i will also get a photo of the output asap


  5. #5
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    Re: bizhub 421 poor printing output

    so heres the issue any ideas why this is happening?.....

    (inkless area on right side)

    the developer unit does look to have a ink dust trails on the roller where this ink is missing

    do i have to take the fusing unit out to get the dev unit out??

    dddd.jpg


  6. #6
    Senior Tech 250+ Posts
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    Re: bizhub 421 poor printing output

    It may be something blocking the laser from hitting the drum in that area.


  7. #7
    Senior Tech 250+ Posts CraigW's Avatar
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    Re: bizhub 421 poor printing output

    ^^^ Yes, check the cleaners status behind front door. Smallest, lowest knob.


  8. #8
    Master Of The Obvious 10,000+ Posts


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    Re: bizhub 421 poor printing output

    Yes, it looks like a dirty laser slit glass to me. =^..^=

    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.


    blackcat: Master Of The Obvious =^..^=

  9. #9
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    Re: bizhub 421 poor printing output

    cleanner of the main charge corona ??


  10. #10
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    Re: bizhub 421 poor printing output

    Quote Originally Posted by myster View Post
    cleanner of the main charge corona ??
    well oh my god, i cleaned the pins you mentioned from behind the front small door

    and cleaned the slit glass and its printing fine now

    unbelievable a 20 second job

    which do we believe did it, the slit or cleaning the pins?

    how do i clean the coroner champ


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