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Keys not registering on JPAC - please help!

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slapaham:

Well, I've been messing around with my JPac for a couple of days or so now and just when it seems like I was making progress, I get another problem.

I finally got the video syncing with my arcade monitor using Soft 15khz (I installed a spare video card which got it all working!) but now I can't seem to get the buttons functioning.

The self test LED is lit but the buttons don't seem to function. I've tried opening notepad and the buttons don't seem to do anything - anyone got any ideas as to where I should go from here?

Any help gratefully received... cheers!

slapaham:

The Self Test LED flashes around 30 times on boot and just ends up going off after... that's the 'official' occurrence if that helps...

Hoopz:

Check out Ultimarc's page for troubleshooting:

http://ultimarc.com/jpac2.html

I know it flashes quickly so check the switches to make sure there aren't ground problems or something not wired properly.  30 flashes on the J-Pac means P1 button 8.  But if your count on the flash is off by a couple it could be P1 button 7 or P2 button 3.  Check out the table and you can see which ones to look at. 

Take your time and check all the grounds.  Also make sure you don't have anything connected to the NC lead on a switch.  That's easy to miss sometimes.

slapaham:

Thanks chap. I was a bit trigger happy in posting but you know how it is... it's takes you days to figure something out and you've just had enough. I think it might be player 2 button 3 causing the problem - partly because at one point, pressing that button lit the self test LED - and secondly, because it can't be any of the others you suggested as the cab only has 3 buttons per player! ;)

I'll check over it - so if one button is out, that can potentially stop all keys from working? ???

Thanks again! :cheers:

slapaham:

Well, the LED lights when you press P2 B3 as mentioned before... but I cannot see any problems with the wiring. I had this cab set up playing MVS with no problems. It is jamma wired not MVS wired by the way. Any other ideas for troubleshooting? ???

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