Makita DFT087F Repair Manual page 26

Symptom
The check functions for Buzzer
and LED indicator work properly
when Battery is inserted.
LED job light does not light up
when the battery is inserted.
Buzzer does not beep when
Battery is inserted.
LED indicator (red/green) does
not light up when Battery is
inserted.
Probable Cause
The function is restricted in the
setting of the dedicated app.
Battery is not charged.
The connector of the light is not
connected.
LED circuit is broken.
Controller is broken.
Battery is not charged.
The connector of Buzzer is not
connected.
Buzzer circuit is broken.
Controller is broken.
Battery is not charged.
The connector of the light is not
connected.
LED circuit is broken.
Controller is broken.
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Corrective Action
Check the setting.
Charge Battery.
Connect it securely.
Replace LED circuit.
Replace Controller.
Charge Battery.
Connect it securely.
Replace Buzzer circuit.
Replace Controller.
Charge Battery.
Connect it securely.
Replace LED circuit.
Replace Controller.