![]() ![]() ![]() If the door chime uses an external transformer that does not mount to the wall above the chime, unscrew the circuit breaker box’s cover with a flat-head screwdriver. If the door chime uses a self-contained transformer, open the chime’s lid. Ways to check the transformer for a Door Chime is working or notĪccess the transformer. ![]() Both types of transformers operate nearly the same. While the latest chimes usually use self-contained transformers that mount inside the chime’s housing. Older door chimes often use an external transformer mounted to the electrical panel or to the wall near the chime. A door chime transformer, called a step-down transformer, creates a low-voltage power source from a standard 120-volt electrical circuit. Usually door chimes work with a power source range from 8 and 16 volts. ![]()
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