Okay group- I have what appears to be a similar problem as I have read through the forum, but I am looking for which order to look at things. When my new to me machine arrived from the previous owner, it played for a little bit. Then I completed the 3 drop targets and locked a ball- nothing happened. The ball didnt go to the idol, a new ball didnt come from the trough. Then I powered it off and on and the trough just spit out balls continuously and the game didnt respond at all, flippers etc. also I noticed the error messages of the mini playfield, the idol and the 3bank drop target. Looking online it suggested Fuse 116 was the culprit and indeed when replaced, the game restarted normally. The mini playfield message was gone as was the idol and both worked in test mode. The 3 bank drop target message was still there, but then I started to play and the drop targets acted normally, the locked ball went to the idol and a new ball was given from the trough. It also removed the error message at next startup. I assumed it was something stored in ROM that had not cleared.
So I began to change some Leds etc. went back to the game and was getting the error message about the 3 bank drop targets switch/coil, Eventually F116 blew again after a game or two. Unfortunately I also had to remove my color dmd because it must use a power supply that is also connected to this circuit.
I put the original DMD back in so I could read the error messages and we are back to square one with the mini-playfield switch coil message, the idol coil message and the 3 bank drop target message. Also upon boot, the Idol kick up coil fires repeatedly ( as if it thinks there should be a ball there and if you listen to it long enough it will then change to the trough ball delivery kickout going off continuously.
When I originally had the problem, I noticed there was a wire on one of the Idol optos disconnect and I thought that may have shorted and blown the fuse, but that theory ( although it needed to be reattached) was incorrect.
Where do I start my diagnostics for what is blowing this fuse, before I dig ito the bridge rectifier theory. Logically i am lead to the 3 bank drop target and maybe that board has gone bad. Any help or guidance as always is appreciated. This is a beautifully difficult machine and I dying to get it set up right.
P.s.I have looked at the mashed switch at the bottom right of the mini playfield, and although it has seen some action, nothing is touching and the diode seems to be intact.
Thanks, Bruce