C368 Yellow light and only on top 1/2

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  • Thib
    Technician
    • May 2017
    • 34
    #1

    C368 Yellow light and only on top 1/2

    This is a strange one...

    Only affecting yellow, partial print/light. I replaced sub hopper assy & y drum & dv unit due to a low TCR situation. The dv unit is seated properly and TCR Y is 6.22.

    See image attached
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    • Ziggy
      Senior Tech

      Site Contributor
      VIP Subscriber
      500+ Posts
      • Feb 2018
      • 692
      #2
      pull transfer belt and make sure the yellow transfer roller inside of belt is still in place. Better yet stop it while doing the yellow test, then pull the belt. that way you could see if yellow is on the belt..
      Edit to add there is also a chance that the laser slit glass could be covered in toner/developer. After all if the TCR went low the developer had to go somewhere. If this is the case you would need to pull the laser(PH) to clean it properly
        👍 2

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        • tsbservice
          Field tech

          Site Contributor
          5,000+ Posts
          • May 2007
          • 7975
          #3
          Originally posted by Markks
          pull transfer belt and make sure the yellow transfer roller inside of belt is still in place. Better yet stop it while doing the yellow test, then pull the belt. that way you could see if yellow is on the belt..
          Edit to add there is also a chance that the laser slit glass could be covered in toner/developer. After all if the TCR went low the developer had to go somewhere. If this is the case you would need to pull the laser(PH) to clean it properly
          Absolutely agree that covers almost every possible scenario
          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.
            👍 1

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            • elmaligno
              Expert technician KM

              250+ Posts
              • Oct 2009
              • 302
              #4
              Replace the belt drive clutch. Trust me
              Field technician since 1994

                Comment

                • tsbservice
                  Field tech

                  Site Contributor
                  5,000+ Posts
                  • May 2007
                  • 7975
                  #5
                  Originally posted by elmaligno
                  Replace the belt drive clutch. Trust me
                  ITB on this model is driven directly by the driving force of the transport motor. Perhaps you meant 1st transfer pressure clutch (CL5) ?
                  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

                    • copier tech
                      Field Supervisor

                      5,000+ Posts
                      • Jan 2014
                      • 8132
                      #6
                      Originally posted by Thib
                      This is a strange one...

                      Only affecting yellow, partial print/light. I replaced sub hopper assy & y drum & dv unit due to a low TCR situation. The dv unit is seated properly and TCR Y is 6.22.

                      See image attached
                      Maybe the yellow transfer roller in the transfer unit is not seated correctly or the spring has fallen out.

                      Let us eat, drink, and be merry, because tomorrow we may die!

                      For all your firmware & service manual needs please visit us at:

                      www.copierfirmware.co.uk - www.printerfirmware.co.uk
                      ​

                        Comment

                        • kingarthur
                          Service Manager

                          1,000+ Posts
                          • Feb 2008
                          • 1327
                          #7
                          Did you put an original yellow drum in, or did you convert a black drum to yellow - if so, did you change the front end caps etc.
                          Tip for the day; Treat every problem as your dog would.....If you cant eat it or f*ck it....then p*ss on it & walk away...
                            👍 1

                            Comment

                            • elmaligno
                              Expert technician KM

                              250+ Posts
                              • Oct 2009
                              • 302
                              #8
                              Originally posted by tsbservice
                              ITB on this model is driven directly by the driving force of the transport motor. Perhaps you meant 1st transfer pressure clutch (CL5) ?
                              Yes, it is
                              Field technician since 1994

                                Comment

                                • Thib
                                  Technician
                                  • May 2017
                                  • 34
                                  #9
                                  Missed this yesterday. Thanks guys! Replaced the TB as it kept getting hung up.20250211_114657.jpg

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