circuit makes sound

[ididit]

not sure whether it's the right place to ask or not. any suggestion/help would be appreciated.

one of my house circuit box began to make noise, I just tighten or loosen the screw a little bit and it will stop the noise a little bit.

Here are some info on the left side of the board:
"To Clean Sticking Plungers, place a few drops of non-flammable cleaning fluid on plungers. Then activate chime, repeat until plungers move freely. DO NOT OIL PLUNGERS."

under right screw - " front"
under left screw - "trans"

right side of the board:
the circuit diagram of circuit board for.


**broken link removed**

 

[audioguru]

It is not "a house circuit box". It is an electromechanical doorbell.
You forgot to describe the new noise it makes but I think it is a hum because its switch is stuck in the on position or its contacts leak AC current because they are corroded.

 

[vwied]

Before taking the trouble to clean the thing, step outside and make sure your doorbell button isn't stuck in the "On" position.

 

[SABorn]

The coil above the terminal marked "Trans" looks as though it has suffered some heat damage, and would well expect some shorted turns there.

It might well be time for a replacement door bell rather than a repair.

Pete.