Makita VC2211M Technical Information page 21

(b) Check whether the boss hole is clogged.
(c) If Buzzer does not beep even after following the above solutions, Buzzer circuit may be broken. So replace it with a new one.
(d) If Buzzer still does not sound even after Buzzer circuit has been replaced, Controller may be broken. So replace it with a new one.
If clogged, completely remove
dust/debris.
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