This board was working in x files but had reset issues, so it was sent back to me as I sold the pin, I fitted JP roms to it and put it in the jp machine, it blew the logic fuse! So I them removed this board and put jp's own board back in the JP and it's working fine again, so there were no issues with the test pinball, the problem seems to be soley around this board or the x files pin it came from, after I received the board I asked the owner to check the logic fuse in x files but it was reported as being intact so to me that would rule out x files being the issue. The only other suspect is the ramtron chip. Hope all that makes sense lolCan't see how wrong PALs would destroy the board. So this board was working in another machine, you put different EPROMs on and stuck it into the machine it failed in? Have you measured voltages in the latter? Maybe there is a short from solenoids to 5V in that one?
I can supply pals if you need them.. The blue dot one at U213 is the main one for cpu. It works on all whitestar 1 games except sharkeys shootout or some other stern around that time
If this doesn't work, then you get nowhere
OK, are you sure the buyer didn't do anything wrong (even inadvertently when pulling it)? Mayhem like this usually doesn't just happen... The Ramtron only has 5V available so can't see how that would blow the whole thing up.
@FinalFight Good thing, can you maybe check what voltage you have on the five volt line? Seems like most of the board is fried there must be a reason for this.
@FinalFight Good thing, can you maybe check what voltage you have on the five volt line? Seems like most of the board is fried there must be a reason for this.
sorry your message came through same time as mine... i mentioned before to ronnie about the reset while trying to check the driver board he said thats true it does reset.Maybe this is the reset loop you were seeing? Afaik the 5V is done from the 8V winding of the transformer via a LM338K voltage regulator - there is no means of a reset there, this voltage should be there and stable. Does he have a scope to see what the voltage is looking like? Maybe there are spikes on there even which fried the chips?
Yes the Jurassic park is working normally with its own board so no issues here, the board I’m trying to repair is from the x files that final fight bought from me, so all going well and I get it working again would hate for it to get fried againNot impossible but that would have had to happen your end. You’re saying that the original board works in your machine. It was continuously resetting in the other one though.
Could be a smoking gun what is f21 fuse for I wonder?
Did you remember to close the coin door before taking the picture?
Yeah door is closed (this is only the driver board plugged in the cpu board is with Ronnie if that changes things with the 50v?Did you remember to close the coin door before taking the picture?
Ok thanks yes it seems that way, just not sure how this could have happened! And how the f23 5v fuse survived on x files if the board had friedF21 is fusing the 50V together with F20. However it happened this is probably the culprit and got shorted to 5V somehow.