Yellow not showiing up

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  • USITC
    • Jun 2025
    #1

    Yellow not showiing up

    I have a Konica Minolta Bizhub C350, when i copy the yellow seems like it is not working. When print something with green it shows up as blue. I am not getting any low toner messages, anyone know what could be wrong?
    Tags: best, bizhub, bizhub c35, bizhub c350, blue, c35, c350, copy, green, konica, konica minolta, level, messages, minolta, print, sense, shows, tech, toner, toner add, unit, wrong, yellow
    • RRodgers
      Service Manager

      1,000+ Posts
      • Jun 2009
      • 1947
      #2
      Originally posted by USITC
      I have a Konica Minolta Bizhub C350, when i copy the yellow seems like it is not working. When print something with green it shows up as blue. I am not getting any low toner messages, anyone know what could be wrong?
      Bad yellow IU or its bot adding toner. You can check the toner lvl in tech mode. Try a forced toner add
      Color is not 4 times harder... it's 65,000 times harder. They call it "TECH MODE" for a reason. I have manual's and firmware for ya, course... you are going to have to earn it.

        Comment

        • USITC
          #3
          I checked the level and it looks ok... how do you do a forced toner add? I think the IU might make the best sense, I thought the IU only needed replacing every 50k... this machine only has 31k on it.

            Comment

            • RRodgers
              Service Manager

              1,000+ Posts
              • Jun 2009
              • 1947
              #4
              Originally posted by USITC
              I checked the level and it looks ok... how do you do a forced toner add? I think the IU might make the best sense, I thought the IU only needed replacing every 50k... this machine only has 31k on it.
              Sorry... i was refering to tech mode. But yeah, I've seen when a toner bottle goes out and the machine never says change it on those models. You can try to take the IU out and give it a shake, but it's probably best to just order a new one. Now the new one should work fine, but if it starts doing the same thing you have a toner add problem and would need it fixed. Usually I find that the one-ways slip that feeds the toner to the IU. The toner add system on that box reminds me of a farris wheel.
              Color is not 4 times harder... it's 65,000 times harder. They call it "TECH MODE" for a reason. I have manual's and firmware for ya, course... you are going to have to earn it.

                Comment

                • USITC
                  #5
                  Thanks! I ordered a new Yellow Imaging unit! I will post the outcome once it arrives.

                    Comment

                    • n25an
                      Service Manager

                      Site Contributor
                      1,000+ Posts
                      • Jul 2008
                      • 1030
                      #6
                      its either a bad developer or developer motor...
                      Sad To Say I Don't Have a Life
                      I do this stuff on the weekends too

                        Comment

                        • Spidula
                          Konica Minolta Technician

                          50+ Posts
                          • Apr 2010
                          • 83
                          #7
                          Sounds like Image unit to me. Try printing a half-tone in tech-rep mode. It will probably come out blank.

                            Comment

                            • fishleg
                              Trusted Tech

                              Site Contributor
                              250+ Posts
                              • Mar 2009
                              • 426
                              #8
                              I'd be very careful with this one seen this a few times come through the workshop... The ones we had would go through a yellow IU once a month would just suck all the developer out of the unit until the copies went blank...

                              We have had success changing the high voltage board top and once was the led assembly that the dev bias flows through..

                              Would love to hear more on this though as no one has ever truely figured why they do it but we have quite a few that went through that pattern of eating drums... A drum fixed ours for a month then it was back the same until boards etc where changed.

                              Good luck....

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