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  1. #1
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    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.

  2. #2
    Trusted Tech 50+ Posts vga_man's Avatar
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    Re: Ricoh 4000 Blank screen

    Quote Originally Posted by kayjaig View Post
    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

  3. #3
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    Ricoh 4000 Blank screen

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    Re: Ricoh 4000 Blank screen

    Quote Originally Posted by vga_man View Post
    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.

  4. #4
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    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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