C458 with C-2557, brand new dev unit

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  • Bman
    Junior Member
    • Dec 2023
    • 9
    #1

    C458 with C-2557, brand new dev unit

    I recently replaced the DV unit on a c458 and it will throw a code C-2557, when I check conf state the K is way low, which is throwing the code. I have added toner manually through service mode however the change is very little. Im thinking its just a defective DV unit but hate to throw another one at it just to see and find out if there is machine issue.

    anyone run into this?
    Tags: None
    • tsbservice
      Field tech

      Site Contributor
      5,000+ Posts
      • May 2007
      • 8008
      #2
      What about toner?
      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.
      Blessed are they who can laugh at themselves, for they shall never cease to be amused.

        Comment

        • Thib
          Technician
          • May 2017
          • 35
          #3
          Have had this happen... usually the sub hopper assy. (Toner feed assy). Also be wary of aftermarket toner, only use a trusted brand, i have seen some mess with the sensor in the DV unit.
            👍 1

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            • copyman
              Owner / Technician

              Site Contributor
              2,500+ Posts
              • Sep 2005
              • 4684
              #4
              Did you really shake the dev unit before installing, especially if box was sitting on end. Did you replace the DV unit because of the 2557 code or something else?

                Comment

                • blackcat4866
                  Master Of The Obvious

                  Site Contributor
                  10,000+ Posts
                  • Jul 2007
                  • 23007
                  #5
                  I had a machine that would take a new developing unit, and suck all the toner out of it in about 90 seconds. It was caused by a bad HVT. It took me (3) developing units to figure that out. =^..^=
                  If you'd like a serious answer to your request:
                  1) demonstrate that you've read the manual
                  2) demonstrate that you made some attempt to fix it.
                  3) if you're going to ask about jams include the jam code.
                  4) if you're going to ask about an error code include the error code.
                  5) You are the person onsite. Only you can make observations.

                  blackcat: Master Of The Obvious =^..^=

                    Comment

                    • tsbservice
                      Field tech

                      Site Contributor
                      5,000+ Posts
                      • May 2007
                      • 8008
                      #6
                      Originally posted by Thib
                      Have had this happen... usually the sub hopper assy. (Toner feed assy). Also be wary of aftermarket toner, only use a trusted brand, i have seen some mess with the sensor in the DV unit.
                      I'm with Thib on this one. Although we had one doing this but TCR was OK.
                      Toners all OEM. We did HVT, DV, DR and ITB still the same.....Grhhh
                      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.
                      Blessed are they who can laugh at themselves, for they shall never cease to be amused.

                        Comment

                        • naren parashar
                          Junior Member
                          • Mar 2018
                          • 4
                          #7
                          Originally posted by Bman
                          I recently replaced the DV unit on a c458 and it will throw a code C-2557, when I check conf state the K is way low, which is throwing the code. I have added toner manually through service mode however the change is very little. Im thinking its just a defective DV unit but hate to throw another one at it just to see and find out if there is machine issue.

                          anyone run into this?
                          Before replacing the developer unit, was your machine working? Or what was the reason for replacing developer unit?
                          If TCR value is low in old and new devloper units , then work on Sub hopper assembly,your black toner is not supplied to developer unit.
                          You have to open the hopper assembly and remove all the all cmyk toners from hopper assembly. Check the mechanism of toner agitator sometime it will stuck or you can find the toner caking within agitator.
                          Clean the toner sensors and repack.
                          Machine has to take the toner automatically after doing this..
                          It is a common problem due to compatible toners.
                          You can fix it by opening the hopper assembly.
                          Relax.👍

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