Let me start by saying that this issue confuses me... obviously. I just picked up a reasonably good condition Mars god of war from a great member on pinside. It functioned correctly there except the 3x bonus light would stay on. After moving the game to my house, when I would play, the game would stop playing background music and vocalized a "tilt" when going over any one of the top rollover lanes and subsequently cut all background sound from prom 1. So...I opened the coin door and looked at the tilt switches. The door tilt switch was permanently closed; so I adjusted it to stay open a little. This was done with the playfield in the upright position. Now, this is when it gets weird. Now when I put the playfield back down, all I get is attract mode vocals and lights. Nothing on the coin door besides the coin slot lights function. The red test button doesn't register, the coin switches don't register and obviously the start button doesn't work.

All connections seem good in the back box and under playfield as I checked. Could I have damaged the driver or mpu adjusting a simple tilt switch on the door with the playfield up or is it just coincidence and this system 80 didn't fair to well in the move? I'm thinking it could be a short as when the top lanes were rolled over it vocalized tilt and could still play minus background sound. But, now she won't even start up and all coils operated correctly; although, some would lose a little umpf during play if there was sounds and vocals at the same time.

Any help is greatly appreciated...

Kind regards,

Michael

I found a transistor under playfield that has a poor solder on it; basically, ground wire was soldered to transistor post and bracket = not good. Probably a side issue.

Unfortunately, I do not have the game manual, but I have the manual for black hole. At any rate, when I get a manual, I will check your suggestions. I am fairly familiar with system 80 machines, I have a couple black holes already.

Yes, the sound worked correctly before the move. I've checked the connections; perhaps, it's just time for new pins in those connectors. At this age in the system 80s life span, new pins for the connections are almost a necessity now a days. I will run through the diagnostic procedures outlined by you tehachapin above and report back my findings on Tuesday. My thanks to all involved!

Fixed, one of the pins on connector a3j5 wasn't making a good connection. I bent each one, one at a time (I know it was risky, could of broke one). I finally got it; turns out after almost 40 years, the pins need a little live to make a solid connection with the board again. Thank you so much for your help! I'm just glad I didn't have to break out the iron and oscilloscope.