Doorbells are among the easiest, least expensive electrical repairs. Materials:
One or two flat-head screwdrivers for removing small screws
Wire strippers
Multimeter
For this repair project, leave the power on. Doorbells use low voltage (under 24 volts) so there is no risk of electrical shock. You can test the doorbell with your multimeter if you want to be sure the voltage is low. The doorbell chime uses a transformer between household circuit and the chime and pushbutton to convert the current to approximately 12 volts. Check the doorbell button - Remove the pushbutton cover (figure A), and remove the screws that hold the doorbell assembly on the wall. Gently pull the device away, and check for faulty connections.
- Repair any faulty connections, or replace the doorbell button with a new one.
- If the button appears to be in working order, you will need to check the chime.
Check the doorbell chime - To check the wiring between the chime and the doorbell button, have a friend press the button while you remove the chime cover and check the terminals with your multimeter. If you get a reading of approximately 12 or 13 volts (figure B), then your wiring is okay.
- After testing the wiring, turn off the power at the circuit breaker box.
- Loosen the terminal screws and remove the wires from the existing chime (figure C).
- Loosen the fasteners, and remove the chime from the wall.
- Thread the wires through the new chime, and fasten it to the wall (figure D).
- Fasten the wires to the proper terminals on the new chime.
- Turn the power back on, test the chime, and replace the cover.
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