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The AC indoor unit I own has an 85dB, 2kHz piezo-buzzer on the PCB. I find it unnecessarily loud, so after coming across this question I filled its hole with blu-tack. This muffled the sound it produces, but not as much as I expected. I'm willing to try hot glue in the future.
What I'd like to know is whether it is safe to remove the piezo-buzzer from the circuit. If not, what can I replace it with?
(Click on images for larger view.)
The schematic diagram and PCB diagram above are taken from the unit's service manual (the location of the buzzer is BZ61). Bearing in mind I don't have much of a background in electronics, and have little experience fiddling with PCB's (sorry!), is there anything useful I can safely assume from these diagrams?
Best Answer
You can completely remove it without any substitution. The Transistors are fully biased in the system by resistors already.
In fact, they have slightly over-engineered it, if you ask me, but these days I'd say I'm pleasantly surprised by such things.
You/it should not even notice the removal by a change in power required for the buzzer circuit to any noticeable extend.