Ricoh 4000 Blank screen

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  • kayjaig
    Trusted Tech
    • Jan 2009
    • 144
    #1

    [Dead] Ricoh 4000 Blank screen

    Hi, I am working on Ricoh MPC4000. It shows blank screen with power lights on.I have replaced good panel and control unit. It remain the same. Any ideas. Thanks.
    Tags: blank, control, replaced, ricoh, screen
    • vga_man
      Technician
      • May 2013
      • 78
      #2
      Re: Ricoh 4000 Blank screen

      Originally posted by kayjaig
      Hi, I am working on Ricoh MPC4000. It shows blank screen with power lights on.I have replaced good panel and control unit. It remain the same. Any ideas. Thanks.
      Happend with me, replaced BICU board, and laser polygon motor..
      BUT you may first test fuses Area on Power board

        Comment

        • slimslob
          Retired

          Site Contributor
          25,000+ Posts
          • May 2013
          • 36833
          #3
          Re: Ricoh 4000 Blank screen

          Originally posted by vga_man
          Happend with me, replaced BICU board, and laser polygon motor..
          BUT you may first test fuses Area on Power board
          Be sure to replace booth at the same time. The blank panel is caused by a blown BICU. The BICU is blown because of the polygon motor. If you only replace the BICU, the bad polygon motor will blow the new BICU.

            Comment

            • kayjaig
              Trusted Tech
              • Jan 2009
              • 144
              #4
              Re: Ricoh 4000 Blank screen

              Cools. Thank you for all advices.
              So replace both BICU and Laser unit at the same time is the key.

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