Tron glitch - spinner or board?

More Cowbell

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My Tron has played flawlessly for the last several years but in the past few weeks it has been glitching. In the tank levels and the grid bug levels, the arm/cannon will spin only part way and then go straight down. So I can only fire in the bottom quarter or so of the overall 360 degrees and if I go outside of that area it goes right back down again. Before I dig into it, I'm hoping someone knows right where to look. I'm thinking it's a spinner issue but not totally sure. Ideas?
 
put it in test mode, then player input test and see what the values are. If it works properly in test mode, chances are its a pcb problem. If i were to guess, i'd guess bit rot in the pgX roms, or one of the sound roms.
 
When my spinner was acting up last year, the fix for it was actually pretty simple. The wire running to it from the power supply board was pulling away from the molex connector at the location where that harness hooks into the power supply board. Once I found out which wire it was, I pushed it back into the connector and all was well again.

You might want to check that first.
 
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