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  1. #11
    RTFM!! 5,000+ Posts allan's Avatar
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    Re: C451: no saturation in blacks

    Take a big old spoon full of toner and chuck it down the Dev tank shoot and print 5 test pages. Keep an eye on the TCR K value under <state confirmation> <level history 1> and see if the TCR value goes up.
    If it does the TCR sensor is fine. Your C-2557 will go away for a short run of print but will return. Normal value is at 6.5% yours should be at 4% to get the code.
    Meaning that the sub hopper thinks its full and supplying toner but its actually not, or it is but no way for the toner to escape. Check if there is toner in the sub hopper. That would be point 7 in the trouble shooting describing toner stuck to the toner detecting sensor.
    Strip an clean sub hopper.

    For your noise hardened toner in the sub hopper could be the issue.
    But then again on these machines it could be the transfer belt cleaning unit.

    If the TCR value is like at 0% them it could be the IU.
    Whatever

  2. #12
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    Re: C451: no saturation in blacks

    Quote Originally Posted by allan View Post
    Take a big old spoon full of toner and chuck it down the Dev tank shoot and print 5 test pages. Keep an eye on the TCR K value under <state confirmation> <level history 1> and see if the TCR value goes up.
    If it does the TCR sensor is fine. Your C-2557 will go away for a short run of print but will return. Normal value is at 6.5% yours should be at 4% to get the code.
    Meaning that the sub hopper thinks its full and supplying toner but its actually not, or it is but no way for the toner to escape. Check if there is toner in the sub hopper. That would be point 7 in the trouble shooting describing toner stuck to the toner detecting sensor.
    Strip an clean sub hopper.

    For your noise hardened toner in the sub hopper could be the issue.
    But then again on these machines it could be the transfer belt cleaning unit.

    If the TCR value is like at 0% them it could be the IU.
    Thanks for the help all, but we solved the problem by leasing a new machine with service included - yay all around! (thread about that here)

    So now it's one less amateur to get in your hair with newbie questions!

    I don't know if there's any second hand value in our old C451 – if not we might just strip it for the motors and whatnots and leave it for our hacklab…

    Cheers
    Mateusz

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