Silence a microwave with simple panel

Silence a microwave with simple panel

I would like to mute the beeping on a Sharp 75MR microwave. I have read that many microwaves can be silenced by holding the 1 or 0 button, or with secondary keys, but this has a very simple panel with only 10 minute,  1 minute and 10 seconds buttons, plus some pre-sets. Holding the number or pre-set keys does nothings, and holding stop activated the child lock.

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