Konica Minolta Bizhub C550i abnormal image

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  • Mr. Breaker
    Technician
    • Nov 2014
    • 17
    #1

    [CQ] Konica Minolta Bizhub C550i abnormal image

    Hi,

    This week we had an interesting case with a Konica Minolta Bizhub C550i (machine with memoryboard)...

    The customer compliant about color copies, as there was an dotted pattern as background to the image.
    When outputting the “testpage” (the one with the bird), only K is doing the correct gradation pattern but all colors (so C,M & Y) don’t do any gradation. So any RGB gradation pattern is 100%, so the 5% gradation check area has an solid 100% coverage and the photo of the bird is (almost) solid black.

    Machine was on firmware version AA7N0Y0-F000-G00-K8-970.

    We changed the baseboard, but the problem was persistent.
    To make a long story short… It turned out to be an simple fix. Just alter the “function version” (softswitch 25) of the machine and change it to any existing function version and after the alteration, change it (back) to the appropriate version (in our case hex 30, so v2.2) and the problem is solved. This problem can probably also happen on the C450i and 650i (or maybe even C250i, C300i or C360i, not sure though about this slower series…)

    As you can imagine it was quite “an ride” to find the solution… So I post it here so you guys won’t have to invent the wheel and make a lot of expenses on parts and boards that aren’t the solution. For reverence I added the abnormal “testpage” output of the machine.

    20220312_174726.jpg

    Best regards,

    Mr. Breaker
    Tags: c450i, c550i, c650i, colors_full_output
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22932
      #2
      Re: Konica Minolta Bizhub C550i abnormal image

      Congratulations on your success! =^..^=
      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
          • 7911
          #3
          Re: Konica Minolta Bizhub C550i abnormal image

          First of all, thumbs up for you posting this thread, not many come here with solutions not questions!
          Secondly, would you mind sharing some more info like:
          - exactly how problem develops(assuming it's not on new installation)
          - counters
          - how on earth you come to an idea downgrading function version and setting it back appropriate
          - some more samples like counter page, CMYK halftones, etc.
          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

            • Mr. Breaker
              Technician
              • Nov 2014
              • 17
              #4
              Re: Konica Minolta Bizhub C550i abnormal image

              Originally posted by tsbservice
              First of all, thumbs up for you posting this thread, not many comes here with solutions not questions!
              Secondly, would you mind sharing some more info like:
              - exactly how problem develops(assuming it's not on new installation)
              - counters
              - how on earth you come to an idea downgrading function version and setting it back appropriate
              - some more samples like counter page, CMYK halftones, etc.
              - It was an new machine (1,5 week onsite at the customer).
              So counters were near 0.
              - My hypothesis is (since IT of the customer didn't changed to the new driver yet), that the machine got in this state by the wrong (really old BH C360 driver, so no I series), but I can't tell for sure.
              - As stated... all halftone output is 100% coverage. Only K will respond to halftone output.
              - First tried, firmware rewriting, second Initialization, swapped baseboard still no joy, so tried several other options, as it turned out to be the function version (as strange as it may sound). But I'm very happy that changing the function version solved the problem, because this could easily become an real nightmare to overcome.

                Comment

                • tsbservice
                  Field tech

                  Site Contributor
                  5,000+ Posts
                  • May 2007
                  • 7911
                  #5
                  Re: Konica Minolta Bizhub C550i abnormal image

                  OK just to be on safe side was machine at proper functional version prior problem - sw. 25 at hex 30?
                  I certainly apologize asking too much questions 😊
                  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

                    • Mr. Breaker
                      Technician
                      • Nov 2014
                      • 17
                      #6
                      Re: Konica Minolta Bizhub C550i abnormal image

                      Originally posted by tsbservice
                      OK just to be on safe side was machine at proper functional version prior problem - sw. 25 at hex 30?
                      I certainly apologize asking too much questions 😊
                      No props, that's correct.

                      Machine was on sw25 hex 30 prior to the problem (and with the problem). Changing sw25 to hex 10 solved the problem. After this... set sw 25 to hex 30 problem stays fixed.

                        Comment

                        • Synthohol
                          Certified Konica Expert

                          Site Contributor
                          5,000+ Posts
                          • Mar 2016
                          • 5737
                          #7
                          Re: Konica Minolta Bizhub C550i abnormal image

                          does not sound crazy, i just has a 750i blow the cpu board. replaced board and loaded latest FW and changed the bit to 30.
                          papercut would not work at all. on a whim (and looking at a sister machine that works with papercut) i saw it was at 10 so i changed it back to 10 and all was right in the world.
                          We know a thing or two because we've seen a thing or two.
                          The medication helps though...

                            Comment

                            • tsbservice
                              Field tech

                              Site Contributor
                              5,000+ Posts
                              • May 2007
                              • 7911
                              #8
                              Re: Konica Minolta Bizhub C550i abnormal image

                              Originally posted by Synthohol
                              does not sound crazy, i just has a 750i blow the cpu board. replaced board and loaded latest FW and changed the bit to 30.
                              papercut would not work at all. on a whim (and looking at a sister machine that works with papercut) i saw it was at 10 so i changed it back to 10 and all was right in the world.
                              That would affect another application I agree but print quality is pretty big imho.
                              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

                                • Mr. Breaker
                                  Technician
                                  • Nov 2014
                                  • 17
                                  #9
                                  Re: Konica Minolta Bizhub C550i abnormal image

                                  Originally posted by tsbservice
                                  That would affect another application I agree but print quality is pretty big imho.
                                  Second that, totally didn't expect to solve the print quality problem with changing the function version.

                                  And to be honest I wouldn't believe it if I hadn't seen it with my own eyes. <= That's the reason of this thread, because one can spend a lot of time and money wasted, while the fix is so simple (and unbelievable)...

                                    Comment

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