I had a weird incident with my Stargate tonight. I finished a mode and the ball locked in the right orbit. The game never ejected the ball and ball search was never triggered. The game appeared frozed while music was still playing. I did a power cycle and the machine kicked out the ball in the right orbit saucer.

Now, the game wouldn't start. It turns out the game is now asking for credits. The service menu that normally appears when you open the coin door isn't there. Switch diagnostics clearly shows that that my switch door switch is working.

I managed to coin-up and get the game started. It seems to play fine besides the Glidercraft mode is awarded a little bit here and there. I'm assuming the game have somehow dropped out of "tournament mode" and this is the expected behavior in coin operated mode?

Thankful for any hints on how to get this back on track.

I wouldn't be surprised but shouldn't the HSTDs be wiped if that was the case?

Thank you kindly! The Glidercraft I suspected something like that but it doesn't start the mode in tournament mode. I'll do a survey around the playfield and see what I can find in terms of loose wires.

Thank you! I'll have a look at this.

How weird. Blue/green/green (655 in diagram above) had come loose on this exact kickback target (center) on mine as well. It doesn't help that I vaguely remembering soldering that wire back before, not having the service menu disappear. But that might've been the signal wire. There were like 5 strains in this wire so not surprised this is a common fault at all.

All good, thanks all!