MX4501 color problems.

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  • copierjeff
    Technician

    Site Contributor
    • Jun 2015
    • 21
    #1

    MX4501 color problems.

    I replaced the PCU board to get rid of a L4-31 code. It got rid of the code, but now the copies and prints are weird. Black and white is fine. The colors aren't right. Grayscale on copies and prints come out in in color.
    Internal test charts come out alright.
    Tags: None
    • ZOOTECH
      Senior member of CRS

      Site Contributor
      2,500+ Posts
      • Jul 2007
      • 3375
      #2
      Re: MX4501 color problems.

      Originally posted by copierjeff
      I replaced the PCU board to get rid of a L4-31 code. It got rid of the code, but now the copies and prints are weird. Black and white is fine. The colors aren't right. Grayscale on copies and prints come out in in color.
      Internal test charts come out alright.
      Have you updated the firmware? Have you thought about calibrating?
      "You can't trust your eyes, if your mind is out of focus" --

        Comment

        • copierjeff
          Technician

          Site Contributor
          • Jun 2015
          • 21
          #3
          Re: MX4501 color problems.

          I work on color Sharp's that often. I tried some of the color adjustments and they seemed to work. One of them failed. I'm not sure which one. I don't have access to Sharp firmware.
          I'm going to go back out there tomorrow. I'll give more info then.
          Thanks

            Comment

            • walterman
              Trusted Tech

              Site Contributor
              100+ Posts
              • May 2013
              • 196
              #4
              Re: MX4501 color problems.

              Perform firmware update and full calibration.

                Comment

                • walterman
                  Trusted Tech

                  Site Contributor
                  100+ Posts
                  • May 2013
                  • 196
                  #5
                  Re: MX4501 color problems.

                  Perform firmware update and full calibration.

                    Comment

                    • MStalkfleet
                      Technician
                      • Apr 2011
                      • 41
                      #6
                      Re: MX4501 color problems.

                      Agree with the other responses. Get the current firmware and then go through the calibration procedure from step one. Usually replacing the exit cooling fans above the fuser in the reverse assembly takes care of the L4-31 error, so I am curious what took out the PWB?

                        Comment

                        • raymondes68
                          Junior Member
                          • Jul 2015
                          • 5
                          #7
                          Re: MX4501 color problems.

                          MFP-SB-154 (service bullten) Additional troubleshooting information for L4-31 error

                          here is a bit of that bullten,
                          L4-31 trouble is displayed when a lock signal from the paper exit cooling fan or the toner hopper fan is detected by the PCU PWB. Therefore, it indicates that the fan is not rotating because a connector is disconnected, motor is locked or fan is obstructed.

                          If exit fans and toner fan are ok, failure of PCU PWB is suspected. Please replace the PCU PWB and confirm if the L4-31 error is resolved.

                          ***Take care to ensure the EEPROM is transferred to the replacement PCU PWB or conflicts will occur.***

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