Disable buzzer - Rival MT660 Microwave Oven

Buzzer is provided in the PCB assembly for ringing ,either the supply is missing to the buzzer or defective buzzer.

Buzzer is responsible for beep, mounted on the PCB assembly,removing buzzer or cut the supply of buzzer is only solution

The buzzer is responsible for beep,it is mounted on PCB assembly,either remove the same or cut the supply sourse to it.

See my video here:
https://www.youtube.com/watch?v=ITHDE-vFaiw

You would have to pull the unit, remove the back cover and inspect the control board. Then identify where the buzzer should be located and see if it is even there. It would be labeled on the board something like BZ1. It will look like a button. I am not aware of any units that would have the feature of muting the buzzer.

Yes , You can disconnect the chime or SOFTEN the chime by just insulating the gong if this is mechanical type or to disconnect the buzzer if this is the electronic control board

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.

If the microwave is not working at all the main control panel or the touch pad can be faulty. However if only the beep is not heard but the microwave works fine then the buzzer can be changed. remove the board, check the buzzer with an external voltage after removal to confirm . If not the buzzer driver can be faulty.

most likley the buzzer has died on you, however its not very smart to try to fix it yourself as there is very hight voltage inside the microwave even after its been switched for for a long time, if you realy cant live without a buzzer going off, brop it into a repair man to fix it for you
is it realy worth the risk of killing yourself just to save a fuw bucks, also microwaves are so cheep now is it realy worth spending good money getting it fixed ?? a new one may be the best way forwards

remove buzzer from board if all still runs well or new pc.board is to be installed.