Ok I turned it on today and went into the test mode for the first time after reading the wiki and got it to run the lamp tests and such, then powered it off and back on and it started up and let me start a game. Probably a user error. This time it ejected a ball into the shooter laner, no sound still. Odd thing was I was looking at it and it has two pots on the sound board and one inside the coin door. I tried the coin door one and as you turn it up you can hear static, at the highest level the most. Swore I heard low level sound for a short period but it went away and I haven’t gotten it working again yet. Then the sound test did nothing when pressed, at one point it worked and emitted a super high pitch noise, I adjusted the pot on the board as it was very low and the one inside the coin door was all the way up. I hit the test button again and it stopped making the noise. It did not put out the whole 2 tones, 3 tones, etc thing that I saw in the manual. Still no sound. Now I can't get it to actually do a sound test again. DIP switch 30 for attract mode is on. Checked all the fuses with a meter. Checked the A2J1-5/6 (5VDC) and it's getting the correct voltage there. Checked the gates on Z13 IC, all of them look good. Any ideas? The game is sweet without sound can’t wait to experience it with it. Thank you for your help.
1. Check *all voltages* at the sound board, make sure they're present and correct.
A. Check the F8 fuse (1A slo-blo) for the sound board with a meter, you may have blown it when you messed with the pot.
B. Check the A2J1-5/6 (5VDC) connection for cracks around the header pins. This is where the sound board gets it's 5VDC from, it's not uncommon for this issue to be there.
2. Check the Z13 IC (7404) on the driver board for a bad gate, if one of these output signals isn't high at start up, the sound board won't run.