Just found your channel tonight. SUBSCRIBED!!!

Our machine has over 155000 games on it (before being switched to Free Play - and it might have been on >1coin per game during some of its life, but who knows) and only slightly more screen burn. Our Big Blue and the other caps are still good (or at least not bad enough for the game to show any signs of bad caps) What threw me for a loop was the fuse holder for the +5V was corroded, sometimes but only sometimes bogging down the +5V, making the game crash which most of the time made the knocker solenoid lock on and blew the sound fuse, because someone replaced the 1A solenoid fuse with a 7A... Ours has the swearing marquee! Also "you should replace" (TM) the 30V Zener with a 24V one. All it powers is the knocker solenoid and the sound board amplifier which is only rated for a max of 27V... A few weeks ago the sound board went weird, all speech was replaced with s and sh sounds (only rarely vowels) - took me three weeks to find out it was a slightly dirty edge connector to the sound board. Very weird, I measured all the voltages and all the signal on the sound board and they were fine.

Nice work 👍i have a collins coin marquee from a cabinet as well. I think that was a South Carolina company Not sure how big that company was in the 80s-90s. Just curious

So the whole problem was because the Power supply Power Transistors Nuts weren't making good contact with the pcb contacts that need a fiberglass pen to clean up the pcb boards contacts? In the service manual for the arcade game it should say what the operating AC ripple voltage should be under operating load. What is the operating AC ripple voltage under load?