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Pull the brushes out and make sure they are in good shape. Sping the motor by had then put the brushes back in and see if it works. Often times the brushes get blocked by wood dust. If not check the power cord and switch for continuity.
The Ryobi does have an overload protector (PN 452110003) inside the switch box. It should be resettable from a small hole to the right of the switch on the front of the cabinet. If not, you may have to go into the switch box to check it out/reset it. If the overload protector is OK, I'd check the condition of brushes and brush springs next.
It can be any number of things that cause this:
1. Broken power cord
2. Failed on off switch
3. Failed trigger switch
4, Brush or brush tube assy failure (Most common failures)
5. Open armature winding
6. Open field winding
If you can not get continuity across the power cord with the switch on and trigger switch depressed yhe only option for further troubleshooting is to open the unit.
1. Shut the power off, and disconnect your Ryobi router. It could be the start/stop switch. So, you can begin checking the switch contacts using the multi-tester. Set if at 1 x 10 Ohms. Put the probes of the tester across the switch terminals. Pressing the trigger on will move the tester indicator to zero if your switch is okey. Otherwise, no moverment - the trigger switch need replacement. 2. Should the trigger switch proved to be okey, Check the carbon brush of the unit, short carbon brush?? you have to replace it.
check the carbon brushes and the armatures commutator (also see if you smell anything burning)... if your thinking its the switch...open the handle and bypass the switch applying 115v directly to the motor wires that enter the load side of the swicth.
You dont have to take the armature out to look at the commutator, just remove the brushes (unplug tool first) and get a flashlight and look into the brush tube and slowly turn the shaft by hand and look for a discoloration or unusual look on the comm bars. The slight burned smell might have come from the speed control or the switch itself, but look at comm and then go from there. You can get a breakdown for this tool at Makitausa.com. Let me know if you need any more help
it could be but i dont have enough info to really help. if the brush isnt working it could be power from the handle, it could be a bad motor, it could be even as simple as something is tangled up in the brush and that will stop it from turning but you can normally smell burning rubber when this happens from the belt slipping. please give me more information. so i may help. thank you james klgr