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Thread: Alarm " J " on 11M Fanuc motherboard

  1. #1
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    Default Alarm " J " on 11M Fanuc motherboard

    I have a hitachiseiki hmc h400.It has a interminnent problem of "J" alarm on mother board.Till date every time we have the alarm we remove the motherboard clean it & put it to use,the alram disappears.
    What can be the problem,pl help

  2. #2
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    Default Re: Alarm " J " on 11M Fanuc motherboard

    Taken from Fanuc manual :

    J : PC or interface converter does not function ( while waiting for answer )

    · Check if PMC ROM cassette, PMC RAM board or interface converter is mounted on master PCB; or replace the above PCB.

    · Bad ladder or blank PMC cassette. Clear PMC RAM to correct.

  3. #3
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    Default Re: Alarm " J " on 11M Fanuc motherboard

    Thanks for the suggestions.
    All these things have already been checked & are working ok

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