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  1. #1
    Senior Tech 250+ Posts
    Konica Minolta C458 Humming/Whistle Noise

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    Konica Minolta C458 Humming/Whistle Noise

    in Konica Minolta C458 getting continuous Humming/Whistle Noise.

    Even the front and side doors are open and machine is not functioning. Is it from power supply? or another card.

    Kindly advise.

    Thanks and kind regards,

    mearmi

  2. #2
    Service Manager 2,500+ Posts
    Konica Minolta C458 Humming/Whistle Noise


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    Re: Konica Minolta C458 Humming/Whistle Noise

    Quote Originally Posted by mearmi View Post
    in Konica Minolta C458 getting continuous Humming/Whistle Noise.

    Even the front and side doors are open and machine is not functioning. Is it from power supply? or another card.

    Kindly advise.

    Thanks and kind regards,

    mearmi
    Not much is on and little output from power supply with doors open. If happening when doors open then I would look at a fan making noise.

  3. #3
    Senior Tech 250+ Posts
    Konica Minolta C458 Humming/Whistle Noise


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    Re: Konica Minolta C458 Humming/Whistle Noise

    I'm with the previous answer, I've had to replace several fans for noise, down by the power supply. Reasonably easy to get to.
    OC

  4. #4
    Service Manager 5,000+ Posts tsbservice's Avatar
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    Re: Konica Minolta C458 Humming/Whistle Noise

    My vote goes to PS.
    See this thread Bizhub C308 Power Supply Humming Noise - Fuser
    Last poster has some interesting ideas
    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.

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  5. #5
    Senior Tech 100+ Posts
    Konica Minolta C458 Humming/Whistle Noise


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    Re: Konica Minolta C458 Humming/Whistle Noise

    Is it similar to a coil whine? 454s had this issue, a board on the upper rear of the machine. I suspect because they were initially designed for 20a but then dropped to 15a, as it only affected the 454s but never fully looked into it. Might be the same for the 458.

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