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Diagnosis.
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There are 4 main types of electrical problem with a Power tool, Cable, Motor, Switch or Speed control.
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The cable and switch can be easily checked out with a meter, as can the motor.
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If all of these seem OK, then the speed control PCB may have failed. When the board fails, the drill just does not work at all.
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Before replacing the board, it is worth blowing some compressed air through the speed Knob, as these can get full of dust and that will stop the saw working.
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