Porter cable 3802L laser is out. Trying to find out if replacing the power supply is the way to go (<$50) but not finding any 'known issues with saw. Local tool repair will price repair & part at least at $150.
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First locate the model number of your Ryobi Miter saw... then search Google for Ryobi Miter saw replacement parts... one result I got is below: http://www.mastertoolrepair.com/ryobi-power-tool-parts-ryobi-miter-saw-parts-c-873_895_937.html
Try that link, select your Ryobi saw model and zoom into the provided drawings so you can locate the switch, screws, and spring (if needed). The part numbers are supplied and you can order them online easily on that same link... Then just repair your saw with the new parts. As you already noticed, the saw is easy to disassemble and get access to the parts for repair. Have fun and good luck... RYOBI Miter Saw Parts
The laser modules in saws are usually powered by induction from the spinning saw blade. Since your saw is only three months old hopefully you either registered it with Hitachi when you bought it or you still have your receipt as this type of failure would be covered under warranty. Call Hitachi, they may send the part to you if you are comfortable with doing the repair or they will tell you where the nearest Authorized Service Center is for warranty work. Hitachi's number is: 800-706-7337 or 770-925-1774.
Possible but I would think not likely Try this Put a new blade on Set a magnet on the table or fence with phillips screw driver stuck to it Slide the point of the screw driver up to within 1/16" from the blade just above the teeth Run the unplugged saw by hand and watch for any side to side movement of the blade Can you move the blade up and down or side to side? If everything seems normal the plug the saw in and run it again watching the screwdriver Please be careful don't allow the screw driver to contact the blade at high speed you will create a bullet
I completely removed the blade and put it back on, tightening the locknut, and now it works perfectly. The blade has not come loose and have used the machine for the last 3 months. The only thing I can think of is that somehow I didn't have the blade correctly installed in the first place, although it didn't wobble or anything.