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arcade wiring question (jpac) please help...
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lostinarcade:

--- Quote from: mgb on August 16, 2011, 11:05:42 pm ---The answer has been given a few times now.
1) Change your power cord to one that has a ground (3rd wire), in order to have a ground path (assuming you outlets are grounded.
2)in the cabinet, put a ground lug on that ground wire
3) run a ground cable (14 gauge) form each of the following locations, to that lug and attach.
      a) The metal frame of the isolation transformer
      b) the coin door
      c) the metal frame that holds the monitor control board (chassis). its mounted on the side wall of the cab
      d) one f the bolts that hold the monitor to the cabinet
      e) any metal controls on the control panel.
4) Verify the wiring of your jpac. You have asked for help but you have refused to verify some of what you've been asked. When helping someone troubleshoot a problem, there are questions that have to be answered in order to figure out what is going on, but you have not been helpful in answering those questions.
You've been given th answers, now you have some work to do to get it going

--- End quote ---

mgb im sorry for asking so many stupid questions i know. but i just needed make 100% sure of how todo this.
i ordered a new motherboard for my computer, put in the cpu and it doesnt work, took the cpu out put it on my friends board it also does not work, so motherboard and cpu fried. then i used my motherboard with my friends cpu and my ram it boots the pc, when trying to install windows it keeps on restarting so i took hes ram and put it in and what do u know windows install. that means 3 components gone. im even surprised the hard drives still work. but now im thinking the power supply might be gone too, cause windows restarts randomly now and gives error msg, thats the only things left the powersupply or the hard drive has something going on with it even if it works fine... how unlucky can u get  :banghead:
im not asking for tech support on the computer, i mainly told this story so u know why i had to make sure so this does not happen again. im not rich and this is a costly lesson. im just amazed that it caused this much damage, i almost cant believe it.
anyways thanks for all the response from everyone and sorry once again for all the questions and if i did not give a straight answer im sorry for that also.
mgb:
No problem,
 I'm sorry to hear about another motherboard blowing.
Did you take care of all the grounding as explained?
Have you verified your wiring to the jpac.

I'm not sure because I've never used a jpac, but I thought the usual problem it'd cause is to short out the 5v.
it just seems odd that it would take out the cpu and ram.

just as an idea, can you get your hands on some older computers for cheap or free and try out on those first?
BobA:
It is a the point where a new jamma harness wired and verified would be safer then trying to troubleshoot a problem where the OP does not have the skills.   An even easier solution would be to strip out the existing and put in and ipac with new wiring.  Does the cab have to keep the jamma harness?
lostinarcade:

--- Quote from: mgb on August 18, 2011, 06:17:08 pm ---No problem,
 I'm sorry to hear about another motherboard blowing.
Did you take care of all the grounding as explained?
Have you verified your wiring to the jpac.

I'm not sure because I've never used a jpac, but I thought the usual problem it'd cause is to short out the 5v.
it just seems odd that it would take out the cpu and ram.

just as an idea, can you get your hands on some older computers for cheap or free and try out on those first?

--- End quote ---

another board did not blow. its still the same board, its just the cpu was also damaged. so now i have to buy a new cpu this week, wanted to get one today but my friend was busy and can only goto the suppliers on monday for me now.  im yet to take care of the grounding, just took 2 days to troubleshoot this computer and seems i might have got myself a defective new motherboard, so have to return it on monday :( ill be sure to do the grounding stuff asap and also check to see that the jamma harness is infact wired up correctly to go into the jpac even if its going to be a mission to check every single connection , it wont be so bad since i can trace every wire to see where it goes from the jamma. atleast there is a chart on the website for the jpac so i can check that just to be safe this time after i do the grounding.
wish i had infact had a old pc to play around with ,but i dont. have to use the new computer and just close my eyes hold my breathe and press start and hopefully after i do the grounding and checked the harness and every piece of wire i can things will be good to go.
i could cry about what happened but guess sometimes to learn something u have to fail a few times...
bottem line make sure ur cabinet is grounded and wired correctly...
lostinarcade:

--- Quote from: BobA on August 18, 2011, 06:48:14 pm ---It is a the point where a new jamma harness wired and verified would be safer then trying to troubleshoot a problem where the OP does not have the skills.   An even easier solution would be to strip out the existing and put in and ipac with new wiring.  Does the cab have to keep the jamma harness?

--- End quote ---

the jamma harness is working like it should with the current game thats in the machine. king of fighters 98 on a neo geo slot 1 board.
the problem was the arcade machine has no ground on it, and im pretty sure since i plugged the computer into it and via the onboard vga of the motherboard thats the reason it killed the board since thats the only way it could have happened. like andy said "Also any short between the tracking on the J-PAC and any ground or other metal part can cause damage as it would ground out the 5 volts sent through USB."

the reason i went with the jpac was its easy todo for keeping the arcade monitor and i want to keep that, not sure what the other option would be if u dont use one to get picture from the monitor to my computer...
another point if i do at some point decide to sell the cabinet, i could always just insert the old gameboard and sell it like that without any issues.
its not rocket since on how todo this stuff, im not building a space shuttle haha. its just if i dont know how todo something its hard no matter how simple it might be, now that i have the correct info ill surely sort out the problem. skills aint the problem since doing this kinda stuff is pretty easy and straight foward,its the information thats the problem. i mean if u tell me wire here , wire there a kid could do it.

anyways ill get to work and let u guys know about what happens.

thanks guys. :)
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