MP 4000B. Help!!!

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  • fotocom
    Technician

    50+ Posts
    • Nov 2008
    • 96

    MP 4000B. Help!!!

    Went to an MP 4000B today with SC 544, after investigation the problem almost certainley pointed to the I/O board (as is suggested in the service manual).
    To be sure, I brought the board along to a nearby working MP 4000B, to verify same, before I went and ordered an I/O board.
    What was I thinking..
    All went well I recreated the fault. Great I thought it has to be the board. Returned the working board to the working machine.
    For some reason I decided to do a memory clear without doing an NVRam upload.
    Now I have SC 302 'charge bias leak' on the working machine...
    Followed the manual with all suggestions and I have drawn a blank.
    Is it possible ive shagged the NVRAm by doing a memory all clear.
    What was I thinking, I must have had a rush to the head, any ideas....
    By the way I have manually inputted the machines SP data from its birth cert by to no avail......
  • secretweapon23
    Technician

    50+ Posts
    • Jul 2010
    • 69

    #2
    have you tried to reset the SC code first? SC 544 is level A SC code, sometimes It can be done just resetting this kind of code rather than to replaced it emmediately.
    Anyone who has never made a mistake has never tried anything new.....A.E.

    Comment

    • fotocom
      Technician

      50+ Posts
      • Nov 2008
      • 96

      #3
      Yes I reset the SC code. It was the very first thing I did but it kept coming back. It is deffinitley the I/O board. The problem is I now have SC 302 on a previously working machine, and I am wondering have I caused this by doing a memory all clear.

      Comment

      • zed255
        How'd ya manage that?

        1,000+ Posts
        • Dec 2009
        • 1025

        #4
        Why on God's Green Earth did you do a memory clear on a WORKING machine? Have you reset all process values to default and reinitialized everything? Did you perform any service to the engine? I find those PCU's to be real finicky and if you don't get all the bias contacts in place perfectly it won't work afterwards (i.e. do not bend or deform them).

        Comment

        • Vulkor
          Senior Tech

          500+ Posts
          • Jun 2009
          • 942

          #5
          I thought 302 was high voltage power supply board

          Comment

          • secretweapon23
            Technician

            50+ Posts
            • Jul 2010
            • 69

            #6
            try to swap the whole working PCDU to the machine that having SC 302 so that you may possibly know where's the cause of this SC 302(PCU / high voltage supply board)

            and one thing dont forget to intialized line position adjustment of laser co'z you said you do memory clear.
            Anyone who has never made a mistake has never tried anything new.....A.E.

            Comment

            • Cipher
              It's not easy being green

              1,000+ Posts
              • May 2006
              • 1309

              #7
              SC544 is likely to be just a bad thermistor or a blown stat (it will be a fuser related problem).

              Memory all clear...wtf lol, you are lucky you did that on a B&W and not on a color box.
              • Knowledge not shared, is eventually knowledge that becomes lost... like tears in the rain.

              Fully qualified technician for Ricoh - Canon - Sharp - HP - Brother

              Comment

              • fotocom
                Technician

                50+ Posts
                • Nov 2008
                • 96

                #8
                Ok an update on the problem.
                We had an SC 544,problem turned out to be a blown I/O board.
                Problem 1 solved.
                Then we had an SC 302, problem turned out to be a blown HV board.
                Problem 2 solved.
                Now the machine is locking up and freezing either at start up or during mid copy or indeed in service mode.
                I suspected the Hard drive. Not the problem.I replaced the Hard disk.
                Bear in mind this machine is only 3 weeks old.
                Im now beginning to have my doubts about the controller.

                As for the working machine which i did a memory all clear on (in a momment of madness), that was sorted after inputing all the smc data correctley and initializing everthing. its running a dream again.A close shave!!!

                Comment

                • tcs04
                  FORMER Techie

                  1,000+ Posts
                  • Apr 2009
                  • 1183

                  #9
                  Originally posted by fotocom
                  Ok an update on the problem.
                  We had an SC 544,problem turned out to be a blown I/O board.
                  Problem 1 solved.
                  Then we had an SC 302, problem turned out to be a blown HV board.
                  Problem 2 solved.
                  Now the machine is locking up and freezing either at start up or during mid copy or indeed in service mode.
                  I suspected the Hard drive. Not the problem.I replaced the Hard disk.
                  Bear in mind this machine is only 3 weeks old.
                  Im now beginning to have my doubts about the controller.

                  As for the working machine which i did a memory all clear on (in a momment of madness), that was sorted after inputing all the smc data correctley and initializing everthing. its running a dream again.A close shave!!!
                  MMMmmmm... When was the last time anyone had 2 (3?!) boards blow on a machine??

                  Comment

                  • TonerMunkeh
                    Professional Moron

                    2,500+ Posts
                    • Apr 2008
                    • 3873

                    #10
                    Lightning strike possibly?
                    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

                    • fotocom
                      Technician

                      50+ Posts
                      • Nov 2008
                      • 96

                      #11
                      Im begining to wonder. Its been while time since i have fitted a board to any of our machines. I dont think I have ever had to put 2 boards in to a machine together. Its a strange one. Especially considering its practically brand new out of it box.

                      Comment

                      • Vulkor
                        Senior Tech

                        500+ Posts
                        • Jun 2009
                        • 942

                        #12
                        Was the machine on a Grounded Surge Protector? We require that in our maintenance agreements and warranties.

                        Comment

                        • tcs04
                          FORMER Techie

                          1,000+ Posts
                          • Apr 2009
                          • 1183

                          #13
                          Originally posted by Vulkor
                          Was the machine on a Grounded Surge Protector? We require that in our maintenance agreements and warranties.
                          I'm beginning to think we should specify this as well

                          Comment

                          • Vulkor
                            Senior Tech

                            500+ Posts
                            • Jun 2009
                            • 942

                            #14
                            Originally posted by tcs04
                            I'm beginning to think we should specify this as well
                            Give the company an opportunity to sell a surge strip and install it since many don't want to go to the store or forget. Also lets you explain the difference between a SURGE Strip and a POWER Strip.

                            Comment

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