Sharp,MX4501N, H4-02 error code

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  • MFPTech
    Trusted Tech

    250+ Posts
    • Nov 2010
    • 486

    Sharp,MX4501N, H4-02 error code

    Sharp,MX4501N, H4-02 error code even after replacing the fuser unit. Machine works after resetting the code but it keeps coming back. Any help will be appreciated!
  • xmasvn
    Technician
    • Jul 2009
    • 70

    #2
    Fusing section low temperature trouble (TH_US)

    cause

    The fusing temperature does not reach the specified
    level within the specified time from turning ON the
    power relay.
    Thermister trouble.
    Heater lamp trouble.
    PCU PWB trouble
    Thermostat trouble.
    Connector, harness connection trouble.
    Power unit trouble.
    Interlock switch trouble.

    check and remedy

    Replace the thermister.
    Replace the heater lamp.
    Replace the PCU PWB.
    Replace the thermostat.
    Check connection of the connector and the harness.
    Replace the power unit.
    Replace the interlock switch.
    Use SIM5-2 to check the flashing operation of the
    heater lamp.
    Use SIM14 to cancel the trouble.

    Comment

    • bilyahn
      Service Manager

      1,000+ Posts
      • Dec 2006
      • 1457

      #3
      Did you happen to check to see if they had any A/C line problems? Have had H4 codes on other Sharps for this reason. Haven't had too many fuser problems with the MX3501/4501 series that a newer fuser didn't fix. Have you updated the ROMs?

      Good luck.

      Bil

      Comment

      • JustManuals
        Field Supervisor

        5,000+ Posts
        • Jan 2006
        • 9919

        #4
        This Parts & Service manual can now be purchased for $12.77 and downloaded immediately after payment from
        Just Manuals | The Internet's largest selection of manuals | Instant Downloads


        Paul@justmanuals.com

        Comment

        • scout

          #5
          Re: Sharp,MX4501N, H4-02 error code

          Has anybody found a solution to this problem? I have a customer with this exact issue. I have moved the washers on the thermistors as suggested in a different forum with no luck. The code will reset using SIM 14 but continues to pop back up. Any ideas?

          Comment

          • MFPTech
            Trusted Tech

            250+ Posts
            • Nov 2010
            • 486

            #6
            Re: Sharp,MX4501N, H4-02 error code

            Originally posted by scout
            Has anybody found a solution to this problem? I have a customer with this exact issue. I have moved the washers on the thermistors as suggested in a different forum with no luck. The code will reset using SIM 14 but continues to pop back up. Any ideas?
            Sorry don't remember how I fixed it, it's been 2 years I no longer work on Sharps. Is there any fan maybe causing this error?
            Good luck

            Comment

            • Toner Boy
              Trusted Tech

              Site Contributor
              250+ Posts
              • Aug 2007
              • 353

              #7
              Re: Sharp,MX4501N, H4-02 error code

              43fuser-temp.pdf
              These should be default values for fuser temp 3501n from a working machine, might want to check sim 43 settings

              Comment

              • sharphead
                Trusted Tech

                250+ Posts
                • Aug 2009
                • 275

                #8
                Re: Sharp,MX4501N, H4-02 error code

                Worth changing the first power board

                Comment

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