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  • how can i Repair MLVA Head?

    Dear sir,
    Here Have 22 Machines in my country(Noritsu-2901)under my Technical support. Some machines was trouble by MLVA head.
    It produce a thin colored line on the printed photo from a specific area(perpendicular banding).
    I Repels all the head by Another one.Recently i'm seeing another some machines create the same problem.
    Now i'm thinking how can i Repair MLVA Head?
    Have anyone any good idea?pls share me.

    NOTE:-how can i Repair MLVA Head?what have inside the Head?pls discribe me step by step.

  • #2
    In most cases only one part becomes faulty on MLVA - ceramic plate, where mounted shutters. If to replace this ceramic plate and adjust position MLVA should be working again. Just one problem - where to get new ?

    On ceramic plate there are 80 elements with shutters ( TB1 - TB40 on the bottom and TB41 - TB80 on the top ) . Just enough one faulty element and you have line, noise, or something else. It is easy to find which element cause it. Ceramic plate can be repaired.

    If you have wide line might be broken MLVA pcb, which is inside MLVA ( at the top - under the cover ) . Also it can cause bad connections between board and ceramic plate. MLVA pcb can be repaired also.

    When have unstable uniformity, or color changes ( usually after some time paper balance becomes brown ) then fault inside drive voltage pcb. It is typical fault - many times had to repair these boards.