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Toyota AD820 - when I on the power there's nothing on the machine LCD display

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I just bought an old Toyota AD820 (not A model).

After switching on the power, there is nothing on the machine LCD display -except '_' on upper 


line left and red LED light gets on.


None of the buttons respond.


Nothing is written in user manual of (35 pages) about this trouble, nor any way to somehow 'reset' the 




i'm new, some questions I owuld like to ask is:


The computer needs to be connected through serial port for enabling 820 to start ?

Also Any thing else i must check ?


Thanks. :)

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