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  1. Repair Parts Home
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  4. Laser Won't Turn On

Miter Saw: Laser Won't Turn on

If the laser on your miter saw won't turn on, the most likely parts that could be causing this are the switch, laser, power supply assembly, and adjustable laser guide. With help from us, you can fix have your miter saw yourself, saving you on time and money.

Miter Saw: Laser Won't Turn on

Guides

Some miter saws have guides with built-in lasers. These guides come in different arbor sizes and require batteries. They can easily be removed by taking out the arbor bolt. Remove the screws behind the guide and replace the batteries and reinstall onto the arbor. Then, reinstall the arbor screw.
Miter Saw: Laser Won't Turn on

Switches

The switch controls the flow of electricity to the laser. If the switch is bad, you can test it. The switch will vary on models. The switch should pull up easily, with a small screwdriver. Unplug the electrical connections. Test the switch with an ohmmeter by attaching it to the terminals of the switch. With the switch in the ON position, the ohmmeter should give you a reading. In the OFF position, it should read O.L (out of limits) or infinity. If you are not getting a reading in the ON position, the switch is bad and needs to be replaced. Attach the electrical connections to the switch and push the switch back down into place.  
Miter Saw: Laser Won't Turn on

Power Supplies

Some models will have a power supply located inside the handle by the main switch. The power supply will supply power to the motor as well as the laser when you pull the trigger. If you are not getting power to the motor and the laser, and the unit has power flowing to it, most likely the power supply needs to be replaced. To replace the power supply, open up the handle of the unit. Lift the power supply out and disconnect all wires at the power supply, making note of where they attach too. Connect them to the new power supply and then reassemble the handle.