Weird button behavior...

monsterbaldy

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I have a track and field, and the right most run button is having some odd behavior.

Here is what I know:

It never closes the circuit when it is not pressed (good).
When I hold it down sometimes it exhibits rapid fire behavior. I am testing this in the name select screen. SOMETIMES it just behaves normally and goes at the normal pace when held down.
All the other buttons seem ok.
Switch seems good... it is a leaf switch.
Wiring connectivity tested ok, I am slightly suspect of a Molex connector between the buttons and the board as it had some corrosion.

Could this be caused by a spotty connection of the positive wire? The ground I think is fine since the other buttons are working fine and have the ground daisy chained. It is the LAST button in the ground link though.

-ben
 
I have a track and field, and the right most run button is having some odd behavior.

Here is what I know:

It never closes the circuit when it is not pressed (good).
When I hold it down sometimes it exhibits rapid fire behavior. I am testing this in the name select screen. SOMETIMES it just behaves normally and goes at the normal pace when held down.
All the other buttons seem ok.
Switch seems good... it is a leaf switch.
Wiring connectivity tested ok, I am slightly suspect of a Molex connector between the buttons and the board as it had some corrosion.

Could this be caused by a spotty connection of the positive wire? The ground I think is fine since the other buttons are working fine and have the ground daisy chained. It is the LAST button in the ground link though.

-ben

You're definately on the right track, it could be anything from the edge connector, the wiring itself, the molex connector, the wire connectors, or the actual contact on the end of the leaf switch. Worst case it could be a pull up resistor or something on the board too.
 
ok... so some new info. Last night while i was testing it some more the game reset itself a few times after 5 minutes. So I was like, score, power supply.

Tested the power supply... 5.4, 12.0, -5.0... so that seems plenty good to me.

While I was there I tightened the screw on a grounding wire going to the metal enclosure of the boards. This might not mean anything, I am pretty sure that enclosure is grounded regardless, in fact that wire might be grounding something else (not sure what, but it's not the CP, button ground, or coin door). Tightening this might not have done ANYTHING.

I also "retightened" the molex, and by retightened, I mean I squeezed it, it didn't move at all, and my hand hurt.

Anyways, after that it worked for 1.5 hours with no issues... then I went to work. Since it was acting like a board issue my best guess was some sort of problem with the board, that is somehow fixed when somehting got properly grounded. ... . Honestly I have no idea.
 
5.4 is TOO HIGH!!!

The voltage should be set to 5.1 at the board itself. Measure at one of the chips or at the big traces at the far side of the top board.

Logic chips run at 5v +/-5% which is 4.75 to 5.25 volts. Any below and things will operate wierdly... any over and you risk frying chips.
 
Any idea how to turn down just the 5V? I don't see any knobs on my power supply, there is a screw but I don't think it adjusts anything.

-ben
 
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