I picked up a Williams Scorpion (no details on its history) and got it set up this morning. All I get from the speakers is a loud hum (no game sound). All other game play appears to function normally. It's a System 6 with a Type 1 sound board that has a diagnostic momentary switch, and a red left/right toggle switch.

Any idea on where to begin? I don't see anything obvious or any connectors that are missing/improperly connected.

So I had to do some research to find a match for my audio board. It's a Type 1 board, but instead of having the volume pot on the board itself, there's a 4 pin connector that runs through the cabinet to a volume pot on the side of the cabinet. Time Warp's manual had what I needed. Nothing jumped out at me as bad -- good voltages, clean board, etc. So I removed it, checked it over, reseated the two socketed chips and put it back in.

Now the hum is gone, and I have all of the game sounds *EXCEPT* the background sound of that era which starts at a set frequency and gets higher and higher as you progress through the ball (high bonus?). In otherwords, the game is silent until I hit something to get a switch activated sound. Multiball sound also works.

Any ideas?

Positive. Listen to the game play demo on papa.org 's video section

Zacaj,

Well that's interesting! So I grounded the 5 pins on the sound board and got 5 sounds (GOOD!). I went into the solenoid test and Solenoid 9 does nothing. I grounded its TIP metal tab and nothing. So there's definitely a problem on the driver board. (The other 4 sound solenoids work just fine). So, next step will be the replace the transistor and pre-driver and see if we're good!

Replacing the TIP 102/2N4401 at Q30/31 for Sound Select #9 fixed it. All sounds are fully functional. Thanks!