Kyocera FS-1035 error C7990

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  • fernando
    • Jul 2025

    #1

    [Error Code] Kyocera FS-1035 error C7990

    Hi, I have an error code C7990 on a Kyocera FS-1035 MFP. Can someone help me on translation and fix of this error?

    Thank you.
  • GESPAGE
    Technician
    • May 2011
    • 40

    #2
    Re: Kyocera FS-1035 error C7990

    code C7990 on a Kyocera FS-1035 MFP.

    Waste toner full. The waste toner sensor has detected that the waste toner reservoir (drum unit) is full.

    Waste toner reservoir (drum unit) is full = Turn the power switch off/on to restart the machine. If the error is not resolved, replace the drum unit

    Defective waste toner sensor = Replace the waste toner sensor.

    Comment

    • fernando

      #3
      Re: Kyocera FS-1035 error C7990

      Hi, Thank you for your reply.

      I already changed the drum and image unit from another one we have here, and the error persist...

      The only thing I don't know where it stays, it's the sensor... can you give me some directions to find it for change it?

      Comment

      • DWise
        Senior Tech

        500+ Posts
        • Apr 2010
        • 895

        #4
        Re: Kyocera FS-1035 error C7990

        Fernando, you can probably contact Paul with JustManuals.com and get a Parts Manual and Service Manual for this model. You'll more than likely need them if you are going to service the printer.
        Do for one what you wished you could do for everyone. - Andy Stanley

        Comment

        • taskalfaman
          Trusted Tech

          100+ Posts
          • Nov 2009
          • 137

          #5
          Re: Kyocera FS-1035 error C7990

          it is located nearby the LSU-unit.
          the best way is to detach the complete scanner unit .

          have fun

          Originally posted by fernando
          Hi, Thank you for your reply.

          I already changed the drum and image unit from another one we have here, and the error persist...

          The only thing I don't know where it stays, it's the sensor... can you give me some directions to find it for change it?

          Comment

          • fernando

            #6
            Re: Kyocera FS-1035 error C7990

            Originally posted by taskalfaman
            it is located nearby the LSU-unit.
            the best way is to detach the complete scanner unit .

            have fun

            Thank you taskalfaman, I will try to have some Fun...

            Comment

            • Joe Foe from Buffalo
              Trusted Tech
              • Feb 2009
              • 399

              #7
              Re: Kyocera FS-1035 error C7990

              Have a fs 1028 same code its not the drum unit since it works in another machine. Please be a little more detailed about the sensor... location part #.....Is it next to the laser unit? I had the machine down to take laser unit out and didnt see it.

              Comment

              • Kyo fan
                Trusted Tech

                250+ Posts
                • Dec 2013
                • 368

                #8
                Re: Kyocera FS-1035 error C7990

                Doesn't matter if it worked in another machine. Take the drum unit out, open one of the sides and empty the waste toner. Restart the device after.

                Comment

                • Ctl-Alt-Del
                  Trusted Tech

                  Site Contributor
                  250+ Posts
                  • Jul 2006
                  • 430

                  #9
                  Re: Kyocera FS-1035 error C7990

                  Originally posted by Joe Foe from Buffalo
                  Have a fs 1028 same code its not the drum unit since it works in another machine. Please be a little more detailed about the sensor... location part #.....Is it next to the laser unit? I had the machine down to take laser unit out and didnt see it.
                  The waste toner tank is full, replace the drum unit (it's built into the drum unit).

                  Comment

                  • Alexkyocera
                    Technician

                    50+ Posts
                    • Jul 2015
                    • 82

                    #10
                    Re: Kyocera FS-1035 error C7990

                    Originally posted by Ctl-Alt-Del
                    The waste toner tank is full, replace the drum unit (it's built into the drum unit).
                    The Drum unit has two opening on either sides, pull them with a small flat screwdriver and vacuum, restart the machine, enter maintenance mode and reset the counter and you shoud be good, if your drum surface isnt damage that is

                    Comment

                    • subaro
                      Service Manager

                      1,000+ Posts
                      • Oct 2010
                      • 1274

                      #11
                      Re: Kyocera FS-1035 error C7990

                      Originally posted by Joe Foe from Buffalo
                      Have a fs 1028 same code its not the drum unit since it works in another machine. Please be a little more detailed about the sensor... location part #.....Is it next to the laser unit? I had the machine down to take laser unit out and didnt see it.

                      If you take a look at the service manual, it would show you exactly whrere it is located. just below the laser unit.

                      9. Toner sensor ................................................ Detects the quantity of toner in a toner container.
                      THE ONLY THING FOR EVIL TO TRIUMPH IS FOR GOOD MEN TO DO NOTHING..........edmund burke

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                      • Joe Foe from Buffalo
                        Trusted Tech
                        • Feb 2009
                        • 399

                        #12
                        Re: Kyocera FS-1035 error C7990

                        Remember this drum unit worked in two other machines. I emptied the toner unit an still went code on original machine. Ended up putting a used drum unit in to fix it an saving one that had the issue for a machine that has a service contract an is in need of one.

                        Comment

                        • tech28
                          Trusted Tech

                          Site Contributor
                          250+ Posts
                          • Jun 2013
                          • 434

                          #13
                          Re: Kyocera FS-1035 error C7990

                          Its in YouTube on how to remove and empty out. Good Luck.

                          Comment

                          • JAMCEOLA
                            Junior Member
                            • Sep 2015
                            • 2

                            #14
                            Re: Kyocera FS-1035 error C7990

                            Please take out the Drum Unit and empty the Waste Toner.

                            Sent from my TECNO-L5 using Tapatalk

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