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  1. #21
    500+ This must be a daytime job



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    Re: Random digits on 7 segmen display Problem - Please, Please help

    David

    Sorry, but been away and missed your post. I hope that a new PIC solves the problem. Your advice that the display is "inverting" the value of the digits seems to indicate that the actual "display" pathways are working but perhaps the PIC has been incorrectly programmed such that its "lookup" table is screwed. Not certain, but logic suggests this may be the case. Anyway, good luck

    David

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  3. #22
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    Re: Random digits on 7 segmen display Problem - Please, Please help

    Unfortuneatly no luck... I programmed a new PIC and exactly the same thing happens, so that rules out a faulty PIC :/
    Did any of you guys came across schematics for masters and/or displays II card ???

  4. #23
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    Re: Random digits on 7 segmen display Problem - Please, Please help

    Hello Dawid

    Here you are:
    http://www.andare-ing.com/uploads/iocard_master_64.pdf
    http://www.andare-ing.com/uploads/Io...splay_mulx.gif

    I have a few OC schematics on my site
    but they may differ a little bit on the connectors and component numbering.
    PCB layout is completely different.

    Sorry to hear all the trouble you have with the Display-II board.
    It's hard to pinpoint the reason. Nice thing though, it's a very simple board
    and not much which can go wrong.
    I track down all my errors by doing visual inspection
    and a MultiMeter testing for short circuit / connectivity.
    When buying readymade IO-board I would expect they are 100% OK.
    When that's not the case something serious has occurred and I would maybe
    asked for a replacement.

    Good luck with your "investigation".
    Regards,
    Per-Erik
    www.hoddo.net

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  6. #24
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    Re: Random digits on 7 segmen display Problem - Please, Please help

    This will help Thanks!
    BTW nice site!
    Unfortuneately I wont be able to return the cards because it all goes through my UNI and it would take ages plus OC either dont answer at all or take ages themselfs..
    the good thing is, a lot of posibilities had already been eliminated so I should be close

  7. #25
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    Re: Random digits on 7 segmen display Problem - Please, Please help

    @Perik T H A N K Y O U !!!
    Thanks to your manual I managed to solve the problem which as always turned out to be a simple thing...
    There was a bad solder ( not really visible ) on the pin 9 of connector J1, with the schematic I was able to identify mux/demux ic's on both sides of the cable and follow the paths to make sure connections are there. Happy, happy, happy

  8. #26
    500+ This must be a daytime job



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    Re: Random digits on 7 segmen display Problem - Please, Please help

    David

    Well done - sorry if my suggestion about the PIC sent you down a blind alley, seemed logical at the time

    David

  9. #27
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    Re: Random digits on 7 segmen display Problem - Please, Please help

    Not at all David, it had to be checked the problem with inverting numbers definitely pointed to problem with logic's somewhere along the way.. bad connection on pin 11 of IC9 ment that there was always a "0" there...
    thanks for all your input Dave and helping me tick things off the list!

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