The manual for model MWV150BKA is
here but it does not discuss any adjustment of the beeper volume.
It may have gotten glitched. You might try a hard reset by unplugging the oven for a couple of minutes, plugging it back in, setting the clock, then trying it again.
For more free DIY and other help & advice, feel free to contact me via my site.
Please include FULL model number*, FCC ID number*, + detailed symptom information.
* on the tag in cooking cavity or around door frame or control frame or on back
William E. Miller, AS-EET
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"
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