Things You'll Need:
- Circuit Tester
- Screwdriver Sets
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Step 1
Turn off the power - at the circuit breaker box - to the portion of the house where the doorbell unit is located.
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Step 2
Remove the cover from the old unit. Covers usually snap into place or have a couple of screws holding them.
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Step 3
Use a simple circuit tester to make absolutely sure the power is off to the doorbell unit.
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Step 4
Disconnect the two wires that go to the doorbell button (these are small-gauge wires almost like telephone wire). Next unhook the power-supply wires - there will either be two wires (ungrounded - most likely a black wire and a white wire) or three wires (grounded - most likely a black, a white and a green wire).
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Step 5
Remove whatever screws mount the unit to the wall. Take the entire unit with you to your local hardware store, home improvement center or lumberyard.
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Step 6
Look over the selection of new models on display.
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Step 7
Decide if your unit is a more expensive model that you should try to repair.
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Step 8
Purchase a total replacement if it is a less-expensive model (repair parts can quickly exceed the cost of a new doorbell).
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Step 9
Pick a model that suits you, if you decide to replace. Make sure it also suits the wiring assembly provided by your residence (most follow the same simple wiring plan).
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Step 10
Replace the transformer or ringer motor if you aren't going to replace the whole unit - this will require a little further testing and disassembly. There is usually someone at the store who can help to test these different possible malfunctions with a voltage meter - and recommend suitable replacements.
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Step 11
Remount the new or repaired unit on the wall and hook up both the power supply and the doorbell button. Replace the cover and turn the power to the unit back on at the breaker box.
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Step 12
Test the doorbell.







