So, i have a coil that fires breifly but pretty hard upon power up. I think its the out hole kicker since i never see one fire and it sounds close to the front of the machine. Not that it matters, any coil fireing on start up is bad. Anyways, it only seems to do it when the game is powered down for a while. I tried leaving it off for 15-20 minutes and couldnt get it to do it, seems to do it when its off for the day and powered up the next day.

I replaced C30 i believe on the main board which solved the problem of the game not booting reliably (when this occured, you'd have to power it down then back up and it would boot fine.) i was hoping this would also solve the coil fireing on power up issue but it hasnt. It sounds to me like its a capacitor somewhere that is gone bad, possibly on the blanking circuit? Or rest? Im going to investigate all the components in the blanking circuit but can anyone point me in a direction or give me a heads up on the capacitor or the common one to fail?

Stange because if it boots fine, im assuming the blanking circut has done its job of locking out all the coils and giving the ok for the board to boot.

it seems to boot consistantly after i replaced C30, i also replaced C10 on the power board for good measure. I just have that coil that fires briefly on power up. Im trying to look over the schematics now but im at work. I'll look at these other components you mentioned also. I do not have a logic probe, i supose i should finnaly break down and order one.

Thanks guys, any more help is apreciated.

It hits pretty hard though. Strange that it didnt do it when i first powered it up after i restored the machine and put it all back together. After replacing C30, which solved my inconsistant booting issue, i was sure it solve the "coil firing on start up" issue. Untill i turned it on the next day, thats when i heard the coil fire as it used to do before i broke the game down. It also didnt fire on boot up when i first brought the game home, it always had the inconsistant booting..., i knew that when i bought it. The coil firing thing came around after a few weeks of owning it.

I have to just dig around and see what i find. I did a ton of reading but found nothing that points in a direction as to this particual issue. Somewhere i read i beleive the blanking circuit locks out all coils upon booting, but im not possitive now and im wondering if its the rest line that does that. I'll keep poking and maybe someone has had this issue before, i find it very hard to believe no one has. So perhaps someone will eventually chime in before i (hope to anyways) figure it out.

Thanks again guys.

I look into ordering a logic probe Jalpert, it will come in handy.

I'll check the connectors again and see if there are any lose chips just to make sure. I think Jalpert is right though, i think something within the blanking circuit is not functioning properly. The coil doesnt lock on, it just pulses once....really hard.

its my EATPM, the board looks pretty good, no damage or hacks. Im going to start checking all the transistors tonight along with a few other things. I'll see if i can dig anything up.

Hhmm..., i seem to agree with Spudgunman, i doubt they built a machine that fires coils upon start up. It likely not the transistor since the coil functions fine otherwise. It has to do with the functions that take place upon power up, most likely blanking circuit related as a few tend to agree.

I didnt have a chance to check things tonight. Oddly it didnt do it when i fired it up tonight and my buddy and my sister wanted to play so we just enjoyed ourselves, i will be looking into the issue though.

Ronnie, C30 is on the main board in the reset circuit. It wont solve the issue of a coil fireing during power up (NOT stuck on, but fireing once and otherwise working normally). It may be the culprit if you have a, "i turn my game on and it doesnt boot, but if i turn it off then back on again it boots fine".

The game turned out great, i made a thread a while back showing the B-A-T decals i made and people wanted to see it when i finished. So, i'll either make a new thread or dig that old one up and add pictures there. It might help people who need these decals or the "25 thousand" decals since i saved the work i did and still have the file.

Gerbal singing into mic guy (funny by the way), im careful not to cause other issues while diagnosing another, advice taken though, thank you.

no problem Pato.

yea its deffinatly worth looking into. for now i'm going to check a few things but probably put it on ice until i pick up a logic probe. i have my sling shot flashers out that i will be fixing in the mean time. i'll update this if and when i figure out the coil firing issue.

Wow thanks buddy, i just read through Ed's report. Very interesting. I guess i'll have to live with it, thanks for saving me the time and trouble of chaseing ghosts.

Ed's report is pretty convinceing. Assuming Ed is missing something and he is wrong (which i doubt he is), the more i think about it the more i think that the blanking circuit is ok, otherwise it wouldnt boot. Its deffinantly the same coil, and it is also possible it is the knocker, even though it sounds like it is comming from the front end of the machine.

When the coil doesnt fire on power up, i get a short buzz/hum sound. When the coil does fire upon power up, there is no short buzz/hum. Its almost like there is a quick pulse of energy that has to go somewhere, sometimes to that coil, and sometimes through the speakers. Ed might very well be right, at least i understand what he is saying and why it happens...

Im not going to worry about it too much but i will check the blanking circuit just for the hell of it. Im starting to think though that im not going to find anything wrong with it.

No its not a diagnostic/switch error knock.

So oddly enough since i've been leaving the game plugged in, the coil hasnt fired. I store this game at my moms house since i only have room for one at my house and she enjoys playing them, she likes to unplug things. I'll report back in a while to see how it works out long term, but so far the last few night i went down there after leaving it plugged in, it hasnt fired the coil on power up.