C284 whistles in standby

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  • Genotrom
    Technician

    50+ Posts
    • Feb 2020
    • 77
    #1

    C284 whistles in standby

    I have a C284 that when it goes into standby starts to whistle consistently. As soon as it comes out of standby, the whistle is almost zero. It comes from some electronic board. I was just passing through, so I had little time for testing. Soon I will return to the place to try to identify the problem. Has anyone had this problem?
    Tags: c284, passing, standby, whistle
    • occus
      Trusted Tech

      250+ Posts
      • Jul 2013
      • 312
      #2
      Re: C284 whistles in standby

      Buzzing/Humming noise come from DCPU/FUPU (1/2)

      <Symptom>
      In a very quiet environment and a machine get into the ready status,
      buzzing/humming noise may come from DCPU (power supply)
      TABT1300108EN**
      DC for C224/284/364/224e/284e/364e or FUPU (Fusing power supply) for C454/454e.

      <Cause>
      Operation noise of the Noise filter for fusing heater lamp mounted on the
      DCPU/FUPU may hear in that environment.

      < Field action>
      Please adjust the Heater control level under the Service mode gradually
      up to the level 4.

      >The setting change is reflected
      and works by turning OFF/ON Noise filter
      the main switch.

        Comment

        • Bix
          Service Manager

          1,000+ Posts
          • Apr 2018
          • 1421
          #3
          Re: C284 whistles in standby

          Originally posted by occus
          <Cause>
          Operation noise of the Noise filter for fusing heater lamp mounted on the
          DCPU/FUPU may hear in that environment.
          It's funny that a noise filter causes noise. is an oxymoron

            Comment

            • Genotrom
              Technician

              50+ Posts
              • Feb 2020
              • 77
              #4
              Re: C284 whistles in standby

              Thank you occus! I have already tried this solution but without success. Is there any other advice? Or should I try a new DCPU/FUPU ?

                Comment

                • occus
                  Trusted Tech

                  250+ Posts
                  • Jul 2013
                  • 312
                  #5
                  Re: C284 whistles in standby

                  Is it the same sound? Have you ever heard the typical sound from the DCPU/FUPU?

                  In the past i had a 284e with a fax speaker that also made noises like this...


                  I've found a old tech info:
                  < Field action>
                  Please adjust the Heater control level under the Service mode gradually
                  up to the level 4.
                  >The setting change is reflected and works by turning OFF/ON the main switch.

                  If cannot be adjusted, please install the following firmware.
                  Only the Heater control level 4 has been changed so as to reduce the buzzing/humming noise more.

                  <Temporary Solution>
                  For C224/284/364/454
                  Please install the special firmware, ver. GC2-68 or later.
                  DL No.: C224/284/364: DLBT1202845EN** C454: DLBT1202847EN**

                  <Permanent Solution>
                  - For C224/284/364/454
                  The change will be applied on next released MR firmware.
                  - For C224e/284e/364e/454e
                  Please install the mass-production program, Ver.G20-63, or later.
                  DL No.:C224e/284e/364e: DLBT1311187EN** C454e: DLBT1311190EN**

                  <Subjected Machines>
                  C224/284/364/454/224e/284e/364e/454e
                  Last edited by occus; 09-18-2020, 11:22 AM.

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