I have been trying unsuccessfully to get our TOTAN running again for the last 6 months. The problems started with switch matrix shorts. I replaced U20 and things were resolved for a short period (maybe a few games, I don't remember, it was months ago).
Then more switch matrix problems. Checked the play field and couldn't find any wires touching where they shouldn't. Had to replace U20 and U23 to get it working again. And it again worked for a short while and broke again. This time G10 error. I found a small amount of green on one of the battery holders so I just bought a Rottendog CPU board and replaced the board. Still had the G10 error, so bought a shifted bits G10 chip. That resolved the error and we were able to get about an hour of play time before another reset and G10 error.
At this point what is the best course of action? Inspect all the coil wires from the playfield to the backbox?
If it's any sort of clue, the last couple times the game reset it was within a second or two of shooting the ball which seems like maybe more than a coincidence. But the first time it reset (6 months ago) I'm pretty sure the ball was in play,in the top left.
Any help appreciated.