TASKalfa 7551ci colors go light after a few hundred copies

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  • logrady2331
    Trusted Tech
    250+ Posts
    • Feb 2011
    • 300
    #1

    TASKalfa 7551ci colors go light after a few hundred copies

    Hello all,
    I have a TASKalfa 7551ci with 38k on it. Yes, not a typo, 38,000 total. We installed it last week and two days later the customer calls and says all three colors are super light/faded. We weren't sure of the health of the developers so we ordered the color MA kit and also replaced the t-belt while we were at it. It set up just like it should with the new PM kit and t-belt. Two days later our tech went to the customer for a follow up and all three colors are super light AGAIN. It never asks for color toner and to my knowledge doesn't present any error codes. Any thoughts? I am leaning toward main or engine pcb but wanted to see of anyone has seen it before. Thanks in advance for any suggestions.
    Tags: color, colors, customer, days, taskalfa
    • blackcat4866
      Master Of The Obvious
      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22599
      #2
      Re: TASKalfa 7551ci colors go light after a few hundred copies

      What simulations did you do?
      Do you have any samples? Try something like this:
      Attached Files
      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

        • logrady2331
          Trusted Tech
          250+ Posts
          • Feb 2011
          • 300
          #3
          Re: TASKalfa 7551ci colors go light after a few hundred copies

          Hi Blackcat,
          Thanks for the response. We cleaned the ID sensors of course, ran 140, and 119, 465,469 and 410. Color density returns to normal after dev refresh and calibration in user tools. It never asks for toner. Black is fine, never goes light. It is plain to see it isn't adding toner as CQ comes back after a refresh. Dev units are brand new so I am ruling out toner sensors.

            Comment

            • logrady2331
              Trusted Tech
              250+ Posts
              • Feb 2011
              • 300
              #4
              Re: TASKalfa 7551ci colors go light after a few hundred copies

              Blackcat, My senior tech tells me ALL colors are affected. Sorry about that. I know that changes the approach. He can run sim 131 and the voltages/toner sensor levels return to normal. No error codes at all. Never asks for toner.

                Comment

                • dalewb74
                  Service Manager
                  Site Contributor
                  1,000+ Posts
                  • Feb 2018
                  • 1015
                  #5
                  Re: TASKalfa 7551ci colors go light after a few hundred copies

                  optics are clean? genuine kyocera parts?

                    Comment

                    • PrintWhisperer
                      Trusted Tech
                      250+ Posts
                      • Feb 2018
                      • 434
                      #6
                      Re: TASKalfa 7551ci colors go light after a few hundred copies

                      Check the customer power for sags and Neutral to Ground faults.

                      Even though it comes with 2 Nema 5-15R power cords, this machine requires a DEDICATED 20 AMP circuit.

                      The hi-volume frames are power hungry and don't like to share.

                      If the power droops during a calibration it could throw it off like that.
                      "Being ignorant is not so much a shame, as being unwilling to learn" - Benjamin Franklin

                        Comment

                        • blackcat4866
                          Master Of The Obvious
                          Site Contributor
                          10,000+ Posts
                          • Jul 2007
                          • 22599
                          #7
                          Re: TASKalfa 7551ci colors go light after a few hundred copies

                          ... and those samples? =^..^=
                          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

                            • BillyCarpenter
                              Field Supervisor
                              Site Contributor
                              VIP Subscriber
                              10,000+ Posts
                              • Aug 2020
                              • 14364
                              #8
                              Adversity temporarily visits a strong man but stays with the weak for a lifetime.

                                Comment

                                • BillyCarpenter
                                  Field Supervisor
                                  Site Contributor
                                  VIP Subscriber
                                  10,000+ Posts
                                  • Aug 2020
                                  • 14364
                                  #9
                                  Re: TASKalfa 7551ci colors go light after a few hundred copies

                                  Oops. The above procedure was for a different model. This is for your model.



                                  Check U468 V-Correction value.
                                  Good value/ sucessfully running last 16
                                  calibrations = 65535
                                  Decimal: 65535
                                  Binary: 1111.1111.1111.1111
                                  (each “1“ = sucessfully calibration)
                                  For checking, use scientifical setting from calculator
                                  Additional you can check Eventlog for
                                  C7601-front ID sensor error
                                  C7602-rear ID sensor error
                                  (C76xx won`t shown on operation screen)
                                  For checking surface from Transferbelt
                                  U465/ Stress must be between
                                  2200 - 2900

                                  KYO_OEM taught me how to check the last 16 calibrations to see if they passed/failed.
                                  Adversity temporarily visits a strong man but stays with the weak for a lifetime.

                                    Comment

                                    • Ropariva
                                      Senior Tech
                                      500+ Posts
                                      • Mar 2016
                                      • 549
                                      #10
                                      Re: TASKalfa 7551ci colors go light after a few hundred copies

                                      Have you tried swapping K drum to M or C before a refresh to see if the issue moves with the drum?

                                        Comment

                                        • fishleg
                                          Trusted Tech
                                          Site Contributor
                                          250+ Posts
                                          • Mar 2009
                                          • 410
                                          #11
                                          Re: TASKalfa 7551ci colors go light after a few hundred copies

                                          Does it slowly fade or is it bam faded prints? If it slowly fades then I think you've got a toner adding problem. I had one where the customer prints a lot of high coverage setting calibration to short seemed to help massively. I also set u325 to mode 2 which someone on here suggested again helped.

                                          I think theres a fault with kyo and certain coverage on the faster engines. I've seen a few with high coverage do it on the 52 53 series. Need some 089 test prints posting on here so we can help better.

                                            Comment

                                            • BillyCarpenter
                                              Field Supervisor
                                              Site Contributor
                                              VIP Subscriber
                                              10,000+ Posts
                                              • Aug 2020
                                              • 14364
                                              #12
                                              Re: TASKalfa 7551ci colors go light after a few hundred copies

                                              Originally posted by fishleg
                                              Need some 089 test prints posting on here so we can help better.

                                              I believe blackcat asked for test prints twice and now this is the 3rd time someone has asked. The OP need to make it happen.
                                              Adversity temporarily visits a strong man but stays with the weak for a lifetime.

                                                Comment

                                                • logrady2331
                                                  Trusted Tech
                                                  250+ Posts
                                                  • Feb 2011
                                                  • 300
                                                  #13

                                                    Comment

                                                    • logrady2331
                                                      Trusted Tech
                                                      250+ Posts
                                                      • Feb 2011
                                                      • 300
                                                      #14
                                                      Re: TASKalfa 7551ci colors go light after a few hundred copies

                                                      Sorry for the typo. I meant main board.

                                                        Comment

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