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Light band on laser printing

Discussion in 'Electronic Repair' started by David Nebenzahl, Feb 22, 2010.

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  1. My trusty HP 2100M printer is now printing with a definite light band in
    one spot on each page. The cartridge is old (bought new with the printer
    back in 19-ought-99) but doesn't have that many pages on it (couple
    thousand). Turning the cartridge to redistribute the toner doesn't fix
    the problem.

    Diagnosis? I'm hoping a certain regular here who lives in "Surf City"
    might answer ...
     
  2. Thanks. I shoulda said which direction: it's lengthwise, down the page
    as it's printed. And it's not a sharply-defined light spot but a light
    area, about 2 inches from the left edge and maybe 3/4" wide or so. It
    prints in that area, but noticeably lighter.

    So how much of the image-producing stuff is actually in the printer and
    not in the cart?

    I'll check out that DIY link now.
     
  3. N_Cook

    N_Cook Guest

    Get into the iron filings and redistibute along the drum, they've got too
    packed in the one spot so not allowing toner to pass at that point. Requires
    more than just shaking the cartridge as a filings thing rather than toner
    thing
     
  4. So you're saying there are iron filings in the toner cartridge?

    I know copiers use iron filings, I seem to remember in the "developer".
    I remember my repair guy replacing them in my big honkin' Kodak copier once.

    So what do I do, just shake the cartridge really hard?
     
  5. N_Cook

    N_Cook Guest

    Hold a magnetic compass nearby, should attract more than magnetised iron, at
    some point between toner hopper and OPC drum
    I'm asuming there is a spring loaded cover to the toner that drops in place
    on removing. Hopefully there is an exposed pulley somewhere and turn it back
    and forth while holding the cartridge vertically and inverting as well, just
    one revolution each way may be enough. If not enough repeat more times
     
  6. N_Cook

    N_Cook Guest

    cog not pulley
     
  7. Interesting. Wouldn't mind a second opinion on this. What do you think,
    Jeff?
     
  8. [snip]

    While this discussion is getting interesting, and I hope it continues,
    I'd like to report that I took my cartridge out and gave it a good
    talking to. Spun it around (in several axes), slapped it upside its
    little head a few times, spun it some more, then put it back in and
    printed some pages. Whatever the problem was is now gone, so we can
    safely conclude that the light band was caused by something inside the
    cart. Maybe some toner clumped together?
     
  9. N_Cook

    N_Cook Guest


    You can send toner cartridges by ordinary post so they must be able to take
    all sorts of rattling in all attitudes without spillage.

    For some reason , unknown to me, the iron filings are called "developer" in
    the photocopier world, much the same mechanical process after latent image
    generation as laser printer, except voltages are different.
    Nothing ever beat the rotating magnet and filings for toner distribution
    AFAIK.

    my page on this sort of stuff
    http://www.divdev.fsnet.co.uk/copiers.htm
     
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