xx in 1 Board problem

shirkle

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I have an old 9 in 1 board that has suddenly stopped working in an odd way. It doesn't seem to recognize the 1 player start button, or up, down, left, or right on the joystick. I unplugged it and threw in a different board and all of those controls worked, so I know it's not a wiring issue.

Any thoughts?
 
Low voltage
Poor connection of jamma board
Ground issue

Nope, nope, nope. I wish it was one of them since they would be easy fixes, but, like I said, I put in a second 60 in 1 board and it worked fine. I swapped them several times. The voltage is fine from the PS.

I don't know much about these boards, so can you point me a little more in the direction of the "buffer chip"? Is that the only socketed chip on the board? Are replacements available?
 
Nope... not socketed... Will most likely be something like a 74LS245 or some other 74xx series chip that is surface mount.

Follow the JAMMA edge connector pins back to the chips and you'll find the chip responsible for the missing inputs.
 
Listen to Channelmanic, he has repaired more than most here.

I only knew of the buffer issues with these types of board because an Owner/ operator came to me to fix the typical problem you are experiencing now. An optical IC buffer system was my solution to fix that problem.

Why the fuzzy answer? Manly because I got a fuzzy question. while I do not know who's XX in 1 board you have, I do understand the underlining common design theory that most of these 1 in XX share.

Tracking down the exact chip as simple as reading the 74 series number on the chip. Which chip is determent by following the traces.

If replacing a chip on the board is a bit too much, I am sure there are others who can do that repairs for you.

Good luck in your repairs. If you have any more questions just ask, There are plenty of knowledgeable people on this forum.
 
I honestly wouldn't have known the make of the board if you had asked. I bought this particular bough at least 8 years ago. It had the most games on it at the time....9 whole games!
Anyway, I found the chip you were referring to and it doesn't look that hard to replace. I haven't soldered anything that tiny yet, but I don't think it will be that much worse than any other board repairs I've done.

I didn't know this was a common failure for these boards, but it's good to know for future reference.
 
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