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Poselesta II input output diagnostic problem

Discussion in 'Troubleshooting and Repair' started by savasev, Dec 10, 2012.

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  1. savasev

    savasev

    1
    0
    Dec 10, 2012
    I make diagnostic of inputs by Program 79 and N5 and I can see a lot of inputs in
    state logic "1" even if I disconect (or not) all input conectors. Most logic "1" I can see
    on the Port 2 A and Port 2 B.
    I opened Poselesta II box and I check all signals from the output of the SFH600-2 , through
    A inputs and Y outputs of the SN74LS14, through flat cable to the PC board with pheripherial
    interface 8255 and processor 68B00. Electricaly I see logic "0" (0.1VDC) on the Port 2 A and B. Must I
    replace processor or 8255 or must I replace whole PC board or something else is problem.
     
    Last edited: Dec 10, 2012
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