How to solve the problem that the security doorbell is broken

How to do the anti-theft doorbell repair method

If the security doorbell does not ring, the fault may come from any part of the circuit - the button, the doorbell or the transformer. The transformer is an electrical component that gradually reduces the voltage from 110-120 volts to the operating voltage of the doorbell from 10 to 18 volts. With the exception of the transformer, all parts of the doorbell circuit can be safely operated without disconnecting the power supply. If you don't know which part of the circuit is faulty, you need to prepare the following tools to repair the doorbell:

Doorbell repair tools

1, screwdriver

2, spare button, doorbell or transformer

3, 12 volt multimeter

4, 110-120 volt multimeter or on-off detector

5, wiring nut or crimp connection

Doorbell repair steps

Step 1: Remove the screws that secure the doorbell button to the house.

Step 2: Pull the button out to the length allowed by the circuit cable, then loosen the fixing screw on the button to disconnect the wire. Connect the two bare ends together. If the doorbell rings, you know that the fault is in the button. Install the new button by attaching the two wires to the new button's set screw and then reattach the button to the house. The doorbell button is a single-pole switch (two wires are connected) that you can place under the respective screws.

Step 3: If the doorbell does not ring when the two bare ends are connected together, the fault may be in another location—doorbell assembly, wiring, or transformer. Removing the bayonet cover of the doorbell may be more difficult to disassemble than expected. Since there are several different types of covers, you may have to try several steps, try lifting the cover up slightly and pulling it out; if not, pull the cover straight out without lifting the cover first, or looking at the bayonet Whether the cover is fixed in the doorbell assembly by pins. If yes, then press the pin and pull the cover to loosen it. No matter what you do, don't use too much force to avoid damaging the beautiful cover.

Step 4: After removing the cover, look for two, three or more terminals and wires, depending on the number of tones that your doorbell system sounds. A standard doorbell or buzzer has two wires that can be disconnected by loosening the captive screws, then wire the wires to a 12-volt multimeter, or connect the wires to the captive screws of the spare doorbell. Cheap doorbells, buzzers or 12-volt automotive bulbs (with sockets and two wires) can be used for testing. If you test the doorbell, the buzzer sounds, or the light bulb illuminates when you press the doorbell button, you must install a new doorbell.

Step 5: If the doorbell assembly has three or more wires, mark them with masking tape: “T” for the transformer, “2” for the front doorbell, and “1” for the rear doorbell. Loosen the captive screws, remove all wires, and connect the wires labeled "T" and "2" to the test doorbell or the screw terminal on the lamp. If the test doorbell sounds or the lamp is lit when the front door button is pressed, then the old doorbell device is faulty. To verify this conclusion, connect the wires labeled "T" and "1" to the screw terminals on the test doorbell. If the doorbell rings when you press the back door button, you can be sure that the doorbell must be replaced.

Note: If your doorbell fails, the fault may be in any part of the circuit, including buttons, bells, and transformers. Before removing any wires from the terminal strip, it is best to mark them so that they are properly placed back in place.

Step 6: If the doorbell does not ring or the button or the light bulb on the doorbell box does not illuminate, then both are normal. By eliminating the rule, you can now know that the fault must be on the transformer or wiring. It is common to find that the transformer is mounted on a junction box, sub-switchboard or main access switchboard, and the doorbell wires are connected to the set screws exposed on the transformer. Connect the test doorbell directly to the exposed low voltage transformer terminal and do not touch any other screws. If the doorbell does not ring, the transformer is faulty or not energized.

WARNING: The transformer is directly connected to the power supply and the current it carries may cause injury. Disconnect the branch circuit that supplies the transformer before operating the transformer. Remove the corresponding fuse or trip the corresponding circuit breaker, or operate the main switch to cut off the main power supply at home.