I have been trying to figure out an ongoing issue I have been having with a Whirlwind. I use this game on route, though it is home right now as I have been trying to troubleshoot the issue for a couple weeks.
Symptom: about every two weeks to a month I am notified that the game is eating balls. When I arrive I find a ball or two locked in the Cellar. Cellar coil will not fire, as well as drop targets will not reset to the up position and sling coils will not fire. Checking fuses I find F4 and F1 blown. If I replace both fuses game works consistently for another two weeks to a month before the same fuses blow again.
I have had a tough time figuring out what is causing this issue and am looking for a bit of direction on something that I may have stumbled across that may be causing this but I have no idea where to start.
What I have noticed is the game sometime does not turn on when powered up, all I get is GI to turn on. If I turn the power switch off then back on it will boot up normally (5V & Blanking lite and Diagnostics flashing) but what happened next after cycling power cycles came to a surprise. I booted the game on and heard a loud pop/knock and it sounded as though a coil or two locked on (not sure as play field was down) and then I lost F4 and F1 again. The business turns the game off every night and back on in the morning so my assumption is this is why I am randomly having this issue.
Doing a bit of research it may be the relay sticking on the Aux Power Board but it sounds as though this would be very rare. I also have read that it may be one of the bridges on the Aux power board but they test fine. I have removed the Aux Power Board, CPU Board and Backbox Interconnect Board checking them for cold soldier joints and none were found. Also checked for shorts, tested switches, coil diodes, power switch on bottom of cab and have not been able to find any obvious issue that would contribute to this.
Question is what would be causing this to happen randomly on boot up? Where should I look?
Thank you for any assistance and sorry for this being long but I wanted to try to explain the symptom in detail.