/diy/ - Do It Yourself

Posting here because it's not mains. How does this type of doorbell work? Someone took it down to paint that wall a couple weeks back and it hasn't worked since. I'm guessing they nudged something out of position. The only thing I can see that could really be messed up is the contacts. Are they both supposed to be touching the contact on the ringer arm when the thing is unpowered? Both not touching? I don't really know where to go from here