Background on MPC2550

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  • GhostInTheMachine
    Technician

    50+ Posts
    • Feb 2010
    • 88
    #1

    Background on MPC2550

    Hey guys,

    I have a MPC2550 that has a blue background on copies only, not prints. It does this obviously in color mode, not b&w. I have adjusted the background sensitivity in user tools but it seems to have no effect. Swapping out the SBU also had no effect.

    Any ideas???
    Tags: 550, b/w, background, black and white, color, copies, copies only, forgot, front cover, mode, mpc, prints, sbu, sensitivity, sound, tools, user
    • TonerMunkeh
      Professional Moron

      2,500+ Posts
      • Apr 2008
      • 3865
      #2
      From both DF and glass?
      It's 106 miles to Chicago. We've got a full tank of gas, half a pack of cigarettes, it's dark and we're wearing sunglasses.

      Hit it.

        Comment

        • GhostInTheMachine
          Technician

          50+ Posts
          • Feb 2010
          • 88
          #3
          It seems to be worse from the DF but it happens on the glass also

            Comment

            • TonerMunkeh
              Professional Moron

              2,500+ Posts
              • Apr 2008
              • 3865
              #4
              Mmm... bent scanner frame possibly. Try a spirit level on it. Could be a bad exposure lamp, CCD or SIO board too. Models of that age have rubbish parts in the scanner assembly.
              It's 106 miles to Chicago. We've got a full tank of gas, half a pack of cigarettes, it's dark and we're wearing sunglasses.

              Hit it.

                Comment

                • teebee1234
                  Service Manager

                  Site Contributor
                  1,000+ Posts
                  • Jul 2008
                  • 1670
                  #5
                  May possibly be an issue with the IPU where image processing is done.

                  Also found this in the GKB, sound kind of similar where maybe the blue background is actually process black but is different in the fact that you say it is not occuring in b/w mode...


                  [Problem]
                  Background when ADS Mode is turned Off
                  In Full Color the background is a process black, In Black and White mode the background is gray. With ADS on there is no evident backgrounding. When ADS is turned off and exposure is at the center setting, backgrounding is exhibited. Print Jobs and internal prints do not have background

                  [Cause]
                  The gray balance adjustment NV RAM Data has been corrupted and has reverted to the default value
                  [Action]
                  Reset the value of SP 4685 - 001 and 002, SP4686 - 001 and 002 and SP4687 - 001 and 002 to the value on the Factory Data Sheet.(Located under Jam Instruction Sheet on the Front Cover)
                  If the Factory Data Sheet is not available try starting with these settings and fine tuning as needed.
                  • SP4685-001 to -26 SP4685-002 to -26
                  • SP4686-001 to -6 SP4686-002 to -6
                  • SP4687-001 to -16 SP4687-002 to -16

                    Comment

                    • kyoceran
                      Trusted Tech
                      • Jul 2007
                      • 100
                      #6
                      a bit silly , but is the auto image density turned on, some machines come with this off, good luck.

                        Comment

                        • Smee
                          Trusted Tech

                          100+ Posts
                          • Aug 2009
                          • 178
                          #7
                          Im with the last post - check Auto Density is turned on. Ive had this on a couple of machines - totally threw me the first time.

                            Comment

                            • teebee1234
                              Service Manager

                              Site Contributor
                              1,000+ Posts
                              • Jul 2008
                              • 1670
                              #8
                              That's true that auto density (ADS) may be off, but if it is it shouldn't leave a background when using plain white paper. That's why I posted the settings that may need to be changed.

                                Comment

                                • kyoceran
                                  Trusted Tech
                                  • Jul 2007
                                  • 100
                                  #9
                                  as parts age and wear , as there is no automatic correction the image can become soiled, remember analogue manual setting.

                                    Comment

                                    • kyoceran
                                      Trusted Tech
                                      • Jul 2007
                                      • 100
                                      #10
                                      I must offer my apologies, i forgot about that scenario, have a good week

                                        Comment

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