I bought this high speed a few nights ago for my next restore project. Everything worked on it. CPU board nice and clean and batteries looked freshly changed. Played a few games on it. Noticed the police beacon was turned off. Spent some time figuring out the adjustments and couldn't get the start button to change the beacon from off to on. Thought maybe I needed to change the batteries.
So I did change them. Start the game up and I get adjustment failure. Hitting the advance button on the coin door just makes it buzz at me and flash adjustment failure. If I do it about 6 times sometimes it lets me into the audits. Once I get through all the audits right back to adjustment failure.
I started to test everything. 1.5 volts at first terminal. 3 volts at the next and 4.5 at the last battery. 4.5 at the top of the blocking diode on the board. 4.1 at the bottom. 4.1 volts at pin 24 on chip U25. I figured maybe I needed a new battery holder and messed this one up changing the batteries. Installed a remote holder. Same issue and still getting all the proper voltages.
Did I destroy my U25 chip changing the batteries? I can't find another possible solution to the problem but would hate to have the change out that chip. Any way of testing if it is bad?