SOURCE: dewalt laser dw087 is blinking and cannot self
this unit does not have any replaceable parts, if the unis is covered by warranty, it would be exchange, if not then check with your local servicenter the max rate program to do so.
SOURCE: DEWALT DW079 LASER LEVEL CALIBRATION
You can not calibrate the Laser in the field it needs to be sent to a dewalt service center however you can check the calibration to see if it is off
download the manual here with instructions on how to check it
Try checking the battery contacts for corrosion. Make sure they are bare metal. Mare sure the batteries were put back in in the correct alignment. You should be able to use a continuity meter to confirm that the switch is working properly. If the batteries leaked onto any of the circuit boards and the checks don't solve it, you're probably best to send it off for servicing.
Good Luck!
SOURCE: DEWALT LASER LEVEL SELF LEVELING THE LIGHT LASER
Laser diodes are no like light bulbs. When a light bulb burns out, it goes black. When a laser diode burns out, it goes to an extreme low power state. You can see red at the source, but there is no beam to speak of. If this is what you're seeing, then contact Dewalt. They are low quality instruments, but will try there best to get you a new one, at a reasonable price.
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