C451 Bad color when print/copy, but self-test is perfect

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  • tsbservice
    Field tech

    Site Contributor
    5,000+ Posts
    • May 2007
    • 7911
    #16
    Re: C451 Bad color when print/copy, but self-test is perfect

    Hey Jim, Thanks for your attitude. Seems you're doing a great service for locals.
    I must admit that was sceptical about your particular scenario.
    Turns out to be my bad.

    Kind regards,
    tsb
    A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.
    Blessed are they who can laugh at themselves, for they shall never cease to be amused.

      Comment

      • Synthohol
        Certified Konica Expert

        Site Contributor
        5,000+ Posts
        • Mar 2016
        • 5737
        #17
        Re: C451 Bad color when print/copy, but self-test is perfect

        Lol,I'm 54 by the way
        When a C454 can be bought off lease for less than the cost of a few DV units I just don't see putting money into a machine the manufacturer wants nothing to do with anymore.
        Fwiw my home copier is an EP2030 and when it has an issue it will find a dumpster but it still works to an extent.
        I took it because a customer was tossing it and I volunteered to take it away
        We know a thing or two because we've seen a thing or two.
        The medication helps though...

          Comment

          • fatduke
            Technician

            50+ Posts
            • Jun 2020
            • 75
            #18
            Re: C451 Bad color when print/copy, but self-test is perfect

            Hi man,

            so if I could give to you my contribute, first:

            Check consumables life (expecially drums, developer, trasnfer roller, transfer belt)
            Check drum voltage settings in service mode
            Run a sensor check
            Try to switch old drums with a new one
            Use PCL6 Drivers on PC where printer is installed

            It seems there is a kind of connection trouble between machine ad communication.

            Please attach demo page test in UTILITY MODE (the one with bird)

            I hope it can be useful

              Comment

              • Jim Z
                Junior Member
                • Jun 2020
                • 6
                #19
                Re: C451 Bad color when print/copy, but self-test is perfect

                Originally posted by fatduke
                Hi man,

                so if I could give to you my contribute, first:

                Check consumables life (expecially drums, developer, trasnfer roller, transfer belt)
                Check drum voltage settings in service mode
                Run a sensor check
                Try to switch old drums with a new one
                Use PCL6 Drivers on PC where printer is installed

                It seems there is a kind of connection trouble between machine ad communication.
                Please attach demo page test in UTILITY MODE (the one with bird)
                I hope it can be useful
                FatDuke-
                Thanks for your comments.
                I did get this problem fixed, here's the cure:

                Found a Stabilization Failure when trying to do Graduation adjustments.
                The half-tone printout only used about 1/4 of the page.
                Turns out that dirty patch sensors were to blame.
                I guess these sensors are for Transfer Belt registration.
                After a few passes doing Graduation adjustments, the old girl is back to being wonderful.

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