Another update: getting close to finished now!  I removed the legs and repainted them again, in the same colour hammertone paint used on the coin door. Rather that strip them back I simply sanded them back with 400 wet/dry paper, gave them a wipedown with Prepsol, gave them a few coats of paint and refitted them to the cab once dry.

I’ve actually had the game powered up and running a few days now, checking everything. Just a few small issues that had to be dealt with, ie switch cleaning/adjusting etc.

The sound board had always had a few probs with some of the tones weak/distorted, especially during the cold weather, and ALWAYS on the 1000 point sound. After studying the circuit I figured it had to be in the tone generator circuits, around U17 (LM324) a quad op amp ic and its associated components. Three of the four op amps in this IC form the score tone generator circuits for the 10, 100 and 1000 point scores. Rather than muck round I simply replaced all the ceramic capacitors in these circuits with new polyester caps as well as the IC itself for good measure. I didn’t have an LM324 on hand so I used a TL074 instead, which is basically the same, having identical pin outs works just fine.

Next I repinned the power supply connectors where needed and used new housings for the connectors, to help improve reliability.