I have a weird problem I've never seen before, and I hope someone can help me! This is for MM. When the drawbridge-down switch is closed, it kills the castle gate switch.
This has nothing to do with the mechanics of the drawbridge. I removed the linkage, so the motor doesn't actually move the drawbridge. There are two scenarios:
Scenario #1: I use the drawbridge test to put it in the neutral or up position. The drawbridge-down switch is open. In this case, the castle gate switch works fine. I can run my finger back and forth at the gate, and the switch toggles.
Scenario #2: I leave the motor right were it is (neutral or up). Then I manually close the drawbridge-down switch with my hand, and the castle gate switch no longer works. When that drawbridge-down switch is closed, the castle gate switch behaves as if the beam is blocked (i.e. dots off on the switch edges display).
It's easily repeatable back and forth. I let go of the drawbridge-down switch and the castle gate switch works. I close the drawbridge-down switch with my hand (without using the motor or moving the actual drawbridge), and the castle gate switch no longer works.
I went through and tested all of the other switches, and they all work normally.
The castle gate switch is on the same row as the drawbridge-down switch. The other switches on that row work fine whether or not the drawbridge-down switch is closed. Only the gate switch breaks. So, what's special about that switch? Well, it's the only opto on that row, if that makes any difference. And they are physically close, if that makes any difference. I thought they would share the same row wire right there by the switches, but since the gate is an opto, that row wire actually goes to the opto switch board, which is nowhere near the drawbridge-down switch.
Here's a vital clue: This all worked normally until I partly removed the drawbridge motor assembly, and took some other things apart around the front of the castle. After I did that, it was broken. So, clearly I did something around the area of the drawbridge motor assembly or the front of the castle that caused the problem. Initially, I figured I broke a wire, but I can't find anything broken. And now that I understand the symptoms a little better, I'm not sure how a broken wire would cause this. When I was trying to debug this, I replaced the optos themselves, and that made no difference.
To give you a little more background, the reason I started taking it apart in the first place was because my drawbridge gears are intermittently squeaking loudly when the motor spins. I was trying to take out the motor assembly so I could study the gears, but after getting it loose from the bottom, and disassembling the front of the castle, I realized that removing that motor assembly was more than I wanted to do. That's when I put everything back together and discovered the problem I had created with the castle gate switch. Independent of this switch issue, I still have the squeaking gear problem, but for now I'd be happy to just get the gate switch working again! I can play with squeaky gears, but I can't play with the castle gate switch broken whenever the drawbridge is down.
Does anyone know what could be wrong?