Hello all. I've been working on a Hot Line machine that has been in my wife's grandparents place forever. I'm sure it hasn't been played in 25+ years. I'm working on a video showing what I've done. It's not perfect, but it's my first one so I'm proud of it.

I do have a question about the sound. Clearly someone silenced it in the past as there is nothing to strike the bell and the knocker is missing. I'm trying to figure out how to give it it's voice back. Is there any way to know if this coil is working or not? If it is, I think I should just need the plunger. Or would it be best to replace this whole thing? Also, I think the knocker attached to those two open wires (but there is no knocker to be found). Does that sound right?

Any thoughts would be helpful. I'm brand new to both this site and working on pins in general. Thanks!

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Thanks for the thoughts guys. Looks like my first step is to get a multimeter. They aren't too expensive and I'll probably need it in the future anyway.

Those open wires are orange/blue and black/white, so they must go to the knocker. Hopefully pinball resource will have one.

Good news, I cleaned things up, replaced the plunger, and now the bell works great. Makes playing the game so much better!

Other news, I got a new knocker from PB resource. However when I wire it up, it immediately energizes and stays energized when I turn on the machine. So obviously the circuit is closed when it shouldn't be and I need to figure out how to fix that.

Looking at the schematics, it seems like a pretty easy fix, one side has the 25c and 10c relays that should be closed by default (which they seem to be), the other side should be open by default but I guess it isn't. Problem is I can't figure out where this side is. The schematic labels it as "replay unit E.O.S. "MK"". I've looked all over the machine and can't figure out where this switch is. I can't find anything that is labeled a replay unit. I'm sure there is an easy obvious answer, but I just can't figure it out.

Can anyone help me solve this issue? Thanks so much in advance.

Totally agree, it definitely would have been easier to leave the open wires! Any idea when the knocker is supposed to work? I assume after you complete the "E" in HOTLINE, but I'm only guessing.

Thanks, really helpful. I definitely wouldn't have looked there. I was looking everywhere under the hood. I'll need to pull it out and get in the backbox.