Working on a Firepower that had been stored in a basement and not powered on the last 20 years according to the guy I bought it from at the Allentown Show. I rebuilt the power supply and am getting my correct voltages. I also installed a remote battery holder even though the original is in excellent shape as are all the boards (front and back) from a visual perspective.
I'm getting 4.4 volts at the board from the batteries and 3.89 volts at pin 22 on the 5101 chip. From everything I've read this is a correct drop off in voltage. However, Firepower's got a weird issue. I can walk away for about hour or so, come back, turn her on and she goes into attract mode. However, anything I do with the settings puts the game back into audit mode. Turning her off and on again with the coin door open does nothing but back into audit mode. I can wait an hour or so and try again and it's the same results; attract mode until I try to change settings. Pressing the start button does nothing either and I do have three balls in the trough.
All of the socketed ROM chips pass Clay's finger test so could this be the 5101 RAM chip that can be an issue? In any case, I've already ordered a new chip from Marco's along with a socket. Any thoughts on whether this is my problem or, possibly, something else?