I jumpered pins 2&3 with the AUTO/MANUAL button up and down while continually touching the 2&3 several times. Just went into Music Test and stayed there.

I did major work on the MPU board, so could there be a problem there?

I did do a lot of cleaning around U51 including the traces to 1J1 and other places on that part of the board. I didn't touch U14 or U36. I doubt it's the switches since I couldn't do diagnostics by jumpering 2&3 on 1J14 and bypassing the door buttons. I'll test them anyway, I guess.

Thanks

I do have an extra PIA that I can put in. I may do that to eliminate U51 being the problem. I'm glad I bought 25 feet of solder wick the last time I ordered it.

Also,regarding the Sol-4 Pop Bumper problem, since the Solenoid Saver board isn't meant to be used in a System 11, is it possible that the 1.25SB fuse is undersized for that solenoid.

Thanks @grumpy,

I just replaced Q68 and Q69 just in case that was the problem and put in a new 1.25A fuse, turned on the game and I manually tripped the bumper once and I watched the fuse burn up. I'll leave the burnt fuse installed since it's somewhat playable. Maybe I'll take out the bumper and rebuild it eventually.

I also just put in a new U51 to see if that helped the diagnostic problem, but it's still not working. I may pick up a new U14 and U36 someday to see if that helps with the diagnostics/audit thing.

Thanks everyone, and let me know if you have any suggestions.

Ok Gang! Believe it or not, I got into the diagnostic/audit mode on my High Speed.

I remembered what DumbAss wrote about jumpering pins on 1J14, so I tried it again but nothing worked. So, while he mentioned the white and blue wires as 2 & 3 my pins were white and green, blue is on pin 4. Now I was concerned and confused which made me start all over with the diagnosis. I started with continuity from the switch on the door to the plug in the backbox which checked out good.

Mind you, I've had this pin for over 25 years and never had any problems other than a couple fuse replacements. Everything always worked, even the door switches. Then it sat ignored in a cold, damp garage in my former home for five years while I built a new home for our retirement. When we sold the house in August we needed to move the machines to our new home and that's when I realized that neglect is a bad thing. This thing has to work! You all know the rest of the story here.

So I decided to check the switches. I put on my DMM to the pins and pushed the black button a few times... nothing. Same test on the middle button...nothing. Then I tested the other side of both switches and they were fine! So I moved the wired to the other side of the switches, turned it on and got right into the setup/diag/audit mode.

I can play 5 balls!!!

The last thing that remains is the blowing fuse on the pop bumper, SOL-4. I'm looking into replacing the entire thing eventually but having the ramp in the way is probably going to make things more difficult. In the meantime I have a pretty nice playing machine again.

Thank-you everyone for your patience, suggestions and expertise. You are really appreciated here.
IMG_4915 (resized).JPG

One more quick question regarding the pop bumper SOL-4...Should I replace some of the bumper parts, the switches or the entire thing?

Thanks again for all your help!

Thanks @cjchand! Wow, just what I need! I was going to look at Youtube, but I will read the @vid1900 post first. Why didn't I think of that...Still learning!