VITO VILALC20 Manual De Instrucciones página 23

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Question/Problem - Cause
Cause
The laser does not turn on when you set the "ON/OFF"
switch to the "ON" position:
• The batteries are discharged;
• Reverse polarity of the alkaline batteries;
Solution
• Replace discharged batteries with charged ones;
• Insert the batteries according to the polarity indicated
in the battery compartment;