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What make and model is it? Does it beep when you press other buttons, or is it always silent now? It could be the speaker if there is no sound at all. Or perhaps you accidentally set the microwave to a silent setting. Try looking in the manual or searching online for silent mode for your microwave model.
Unplug microwave, open top, "several screws" look to where the keypad is, behind that you should see the control board, mounted you should see a round black device may be a speaker or pizza buzzer, verify that is sound.
Hi, this is usually a bad touchpad. The way to tell for sure is to kill power to the unit, take the control panel down and unplug the ribbon connector that connects touchpanel to the clock. Put it back together and reapply power. The clock will just sit there blinking and, obviously, the buttons won't work, either. if the beeping stops, then the touch panel is bad. And If it still beeps, then you have a bad clock.
I have 2 possible solutions for you.
1) press and hold the 0 button for 3 seconds. This may only turn the clock display on or off, but may also mute or unmute the beeps.
2) unplug the unit for 30 seconds to a minute. Plug it back in and it should be reset.
From what you have described, it appears that the microwave oven works fine, except that the beeper doesn't work like it used to.
This could be caused by a couple of things.
First, there is typically a piezo electric speaker that creates the "beeping" sound. It's possible that this part has failed. It's a mechanical device and can break. This part is relatively inexpensive.
The piezo speaker is controlled by the microprocessor board. It's possible that there is a problem with one of the output lines from the microprocessor that is tied to the speaker.
One way to determine which part is defective, is to try connecting another speaker in parallel across the original speaker, or remove the original and try the replacement (least expensive method).
If there still is no sound, then I would suspect the problem is on the microprocessor board. (most expensive method).
If I can be of further assistance to you, please let me know.