Door Bell - Fault finding with multimeter

[garrymum]

Door bell has fallen off (well almost). Door bell connected with twin core and earth via what looks like a small grey transformer. I knocked it whilst decorating and it fell, once of the wires came off one of the back connectors of the door bell. Only held to the wall by a small screw barely screwed into just the plasterboard!!!

Anyway, put the wire back on and it does not work now. I put my multimeter on the two terminals and pressed the doorbell and nothing. I was hoping to see circa 3 volts as the door bell can also work from 2 x 1.5v D batteries.

What other tests can be performed to find out why it's not working?

 

[BigJon]

Check your getting an output voltage on the outgoing side of the transformer.
If you are gettting the correct voltage ( the transformer will say what voltage it is, 4,8,12 )
If you are, try isolating the transformer then joining the 2 wires at the door bell and turn power back on to transformer to see if the doorbell works.
If it does the doorbell itself is at fault.
If it was working before it fell off the wall chances are thats where the fault lies

 

[ban-all-sheds]

Stick a couple of D cells in and see if the bell works...

 

[garrymum]

Stick a couple of D cells in and see if the bell works...

I tried this at first but still nothing. Which made made me then think the doorbell was faulty which then made me get out my multimeter. If there were 3 volts across the two wires that would have confirmed that but there was nothing, making me think the issue is with the wiring somewhere.

 

[ban-all-sheds]

Maybe you have 2 problems?

Perhaps the trauma to the bell created a fault which took out the transformer?