My Black Knight is suddenly playing the acceleration music when it shouldn't be. I have no idea why it's doing this. If the machine is just sitting idle it will just suddenly start playing the sounds and get faster and faster and faster until it reaches the end, then it might repeat. Then the regular "The Black Knight will slay you AH HA HA" for the attract mode will play interrupting it, but it will continue after.

If I turn it off while it's doing this and back on, it'll just start right back at the beginning.

If I start a game while this is happening, the acceleration will stop and you'll hear the hooves galloping when you launch the ball, but then it'll continue after that.

While this is occurring, it plays the wrong sounds for some of the events.

After a while (sometimes 10 minutes, sometimes 30 minutes) it will stop, and if I leave the pin on for the rest of the day it'll never do it again.

The only thing I've attempted to do to fix the problem is replace the batteries.

Here is a video of what it's doing:

If you skip ahead to 4:14 you'll hear the Black Knight taunt and interrupt the loop, but it just continues on after.

If you skip ahead to 4:25 I start a game and you can see it's still doing the loop, but playing other sounds.

Any help or guidance would be greatly appreciated.

Yes.

I have not. I was hoping to get more insight on the problem before I started seriously messing with stuff.

This is the only pin I have, I don't have any other hardware to try and swap out.

Interestingly enough though, I looked up the manual and read through it, and I hit the diagnostic button on the sound board. It went through it's cycle a few times, and I turned the machine off and back on.... and it hasn't show the problem again since then. I've left it on for about 4 hours now and nothing but the normal attract mode stuff.

I'll turn it off for the night, and then turn it on again tomorrow and see if it displays the symptoms again.

I wish I had better news. I turned the game on about noon today and kept it on all afternoon. I played it a few times. I never once did the acceleration music, everything worked as it should. I had an errand to run at 6PM so I turned it off. Got home around 7:15, turned it on, and about 5 minutes after that it did the acceleration music. It did it for 4 cycles, and then it stopped, and hasn't done it again since (It's now a little after 8).

So it's obviously not fixed.

I know it's been a long time since I've posted an update on this issue, life took priority.

I'm back on to trying to fix this issue, and I noticed something this morning. There are drop targets on the upper left playfield that are not resetting. All 3 of them are down, and starting a new game they don't pop-up. Now that I think about it I haven't seen those targets in a while. They're sideways and I guess I just didn't notice.

Anyway, the acceleration music is the same thing that plays when you hit drop targets... and I'm wondering if since those aren't resetting if that's why it's just continuously playing this music.

I'm not sure how to diagnose this issue. Is it a board issue and it's not telling the targets to pop-up? Is it a mechanical issue and I need to raise the playfield and take a meter and look at something?

I've attached a picture of the offending drop-target bank.

IMG_1544 (resized).JPG