MPC4000

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  • GeorgeBest
    Senior Tech

    500+ Posts
    • Jul 2009
    • 520
    #1

    MPC4000

    Hi,

    Got this MPC4000 with a start up problem . . .
    Costumer said that the power lamp was going on/off a few times,
    after that no display, green power lamp and red indication. . .

    Checked and swapped the BICU, no results.
    checked the fuses, seems allright.
    checked the laser, swapped the polygoon motor.
    again no results . .

    Proberly the PSU ?

    anyone, thanks in advance
    Tags: None
    • Gary Bowen
      Bowdog

      250+ Posts
      • Mar 2008
      • 250
      #2
      Re: MPC4000

      Any prior work done on this machine in last 1 to 3 months? Something removed and maybe now there is a pinched wire shorting to the frame. Remove any accessories (feeder, finisher) to see if it powers up correctly. Disconnect Paper Feed Assy harnesses, etc. Does it power up with the covers open? Any SC codes? I would try a Controller PCB before the PSU but I would try some other diagnostics before throwing more wood on the fire.

        Comment

        • duct tape
          Technician

          50+ Posts
          • Jun 2009
          • 87
          #3
          Re: MPC4000

          Check the web image monitor to see if any service codes exist that's one thing you could check. Anytime I have no display that's the first place I check.

            Comment

            • petermuylle
              Technician
              • Jul 2015
              • 18
              #4
              Re: MPC4000

              I had a few cases where the machine powers up, but nothing is displayed on screen. when you look closely you van see a SC202 on the screen, but no backlighting.
              in this case replace the BICU and polygon motor.

              Also had one where the backlight board in the opperation panel was fried.

                Comment

                • hdmr
                  Helpdesk Engineer

                  50+ Posts
                  • Feb 2013
                  • 51
                  #5
                  Re: MPC4000

                  Originally posted by petermuylle
                  I had a few cases where the machine powers up, but nothing is displayed on screen. when you look closely you van see a SC202 on the screen, but no backlighting.
                  in this case replace the BICU and polygon motor.

                  Also had one where the backlight board in the opperation panel was fried.
                  this was my first thought as well!

                    Comment

                    • francisco
                      Trusted Tech

                      100+ Posts
                      • Nov 2009
                      • 168
                      #6
                      Re: MPC4000

                      Originally posted by petermuylle
                      I had a few cases where the machine powers up, but nothing is displayed on screen. when you look closely you van see a SC202 on the screen, but no backlighting.
                      in this case replace the BICU and polygon motor.

                      Also had one where the backlight board in the opperation panel was fried.
                      change polygon motor and repair the BICU(only R294 0 ohm is damage)

                        Comment

                        • LNorris
                          Senior Tech

                          500+ Posts
                          • Sep 2008
                          • 645
                          #7
                          Re: MPC4000

                          have had those same issues, unplugged hdd and symptoms started clearing up. reformatted hdd

                            Comment

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