(As an aside, I have figured the circuitry around that volume control and believe there is a fairly simple way to scale down the overall volume of the machine.) So the test described above confirms: the electronic volume IC, the output amplifier IC mounted tro the heatsink (AP5), the speaker wiring, the speakers and the rotary volume control. I have confirmed that it does indeed control the volume. The rotary control I ask in my question #2 is a volume level setting.

I've injected an audio source via a coupling capacitor to the input of IC14 (M51132L - Electronic volume) and get sound out of the speakers. I am not getting any sound and I am convinced there is a problem with the sound PCB (PB-S-30600). Below I provide the answers to some of my questions.īut I still have some two lingering problems (A&B):Ī. Since the original post I have learned much and was able to answer some of my own the questions. For instance, what would be the payout for three plums? There doesn't seem to be any indication on the front of the machine that provides that information. Can anyone direct me to a listing for the payout combinations?. Lastly (for now?), there is a PCB mounted on the back right hand side of the cabinet (see photo). I don't see any externally accessible control for volume on it.Ĥ.

In pursuit of the 'no sound' issue, I have also attached a photo of the PCB on the left side of the back of the cabinet which I assume generates the sound. What is the purpose of the rotary control? (Sorry for the poor picture quality.)ģ. Appears it can be set on any number from 1 to 9 (or something like that). There is a numerical rotary control on the left hand side of that PCB. This appears to be an interface PCB to the speakers. There is a PCB on the upper part of the inside of the door. There are two slide switches near the bottom of the power supply (photo attached) What are the functions of them?Ģ. I have a number of questions I was hoping forum members could help me out with:ġ. It is now working except there is no sound even though all the speakers are wired. It was rat infested but I was able to clean it out and repair traces on the reel interface PCB (made a schematic of the reel interface PCB if anyone is interested). I recently acquired a 'Welcome to Fabulous Las Vegas' slot machine (photo attached -I'm not sure if I have attached the photos correctly - let me know if I need to do this in some other manner).

Welcome las vegas slot machines