Makita DTD155 Repair Manual page 25

Symptom
No
LED job light is
on.
Yes
There are scrape
marks on Rotor.
Yes
The machine still shows the same symptom
in spite of the above corrective actions.
Cause
Connectors are poorly
connected.
No
Lead wires are broken.
Switch is broken.
LED circuit is broken.
No
Controller is broken.
Rotor is broken.
Stator is broken.
Controller is broken.
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Corrective action
Connect Connectors firmly.
Check Lead wires and
replace them.
Replace Switch.
Replace LED circuit.
Replace Controller.
Replace Rotor.
Replace Stator.
Replace Controller.