Results 21 to 27 of 27
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02-22-2012, 05:37 PM #21
- Join Date
- Jul 2013
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- 917
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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Post Thanks / Like - 1 Thanks, 0 Likes, 0 DislikesDawid Szczeblewski thanked for this post
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02-25-2012, 08:34 PM #22
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- Feb 2012
- Location
- Perth, Perth and Kinross, United Kingdom
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- 37
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 ???
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02-25-2012, 10:42 PM #23
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".
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Post Thanks / Like - 1 Thanks, 0 Likes, 0 DislikesDawid Szczeblewski thanked for this post
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02-26-2012, 11:24 AM #24
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- Feb 2012
- Location
- Perth, Perth and Kinross, United Kingdom
- Posts
- 37
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
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02-26-2012, 05:48 PM #25
- Join Date
- Feb 2012
- Location
- Perth, Perth and Kinross, United Kingdom
- Posts
- 37
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
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02-26-2012, 05:53 PM #26
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- Jul 2013
- Posts
- 917
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
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02-26-2012, 06:15 PM #27
- Join Date
- Feb 2012
- Location
- Perth, Perth and Kinross, United Kingdom
- Posts
- 37
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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