Help required.

I am an Engineer of over two decades in maintenance of broadcast equipment. The regular display "to service" or "Reset..... ..." Has been a major problem to us and at first i thought it to be dirts on the head. Cleaning brings only a relief that cannot be guaranteed. I always like challenges but this has become a problem. Most cameras that arrive here for maintenance normally comes with this problem that looked so simple. Is there anything we are doing wrong? What is the best cassette that is most suitable with this camera? I have one with no display on the plasma screen since yesterday. The problem is coming from the board that carries the power circuit. Can anyone help with a clue. Opening to the this main board is so difficult. Is it possible I can be help with a download of the manual? Thanks.

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