X's & O's
Bally, 1983You're currently viewing posts by Pinsider JReedie.
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I've swapped out the acid damaged MPU and replaced it with an Alltek board and the game works perfectly. My one big issue is the ball/credit display doesn't work at all, it doesn't even glow slightly like the others do when no digits are displayed. I recently bought a replacement 6 digit display and it's having the same issue. All other displays work perfectly fine.
Any ideas as I'm totally stumped?
Quoted from Billc479:You mentioned no glow - did you verify voltages on the display board? Since you had acid damage, I would look closely at the plugs that feed the displays from the MPU-its possible you have corroded pins.
Did you check your settings - on free play the credit unit does not show, may not be related, but...
I've just tested Voltages, the non working display is recovering just over 3Volts while the others are getting about 175Volts. This is my first SS game so any suggestions on what's causing the low voltage at that display only?
Thanks,
James
Quoted from Billc479:James -
Test the high voltage at the connector pin on both ends. It should read about 175VDC. If you're missing the high voltage at the display only, but have it at the MPU end, then you have a bad wire/pin. If you don't have the high voltage at each pin (At the MPU and at the display) then you have an issue at the MPU board. You should be able to access the side of the pin with the connectors on.
Its possible that you have a corrosion damaged pin at the MPU connector that feeds the voltage to the display. Repinning that entire connector is likely the best thing to do.
As an aside, to verify a corroded pin, insert a paper clip into the pin a few times, then connect the connector and see if the display comes back. If it does, then you have a corroded pin and should replace all the pins on that connector. This may not always work, but its worth a try.
It should go without saying, but do this with power off. Also, do not connect and disconnect the connectors with power on. You can really mess something up.
Please excuse me for sounding stupid here. (I've always been an EM guy) which wire is it on the connector that's actually carrying the voltage? The MPU is a brand new Alltek board so is it reasonable to presume the issue is not at that end? I also don't quite understand how to test the voltage of each pin while it's connected.
Again, sorry if my questions sound dumb haha
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