Question about Porter Cable 423MAG Factory Reconditioned 7 1/4" Quik Change Blade Left Mag Saw Kit

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My trusty PC 7 1/4",15 amp after many years simply stopped running .no electric/burniing smell. hoe do i diagnos burnt out motor versus cord/switch break?

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Check the carbon brushes by removing the black cover on the end of the motor. The brushes should be long enough so the spring can hold them firmly against the armature. The end of the brushes should be slightly concave and smooth/shiney. If they are worn down too short or look broken and don't touch the armature replace them. If the brushes are OK, take the right half of the handle off, should be five or six screws. Look for any burn marks or melted wires along the cord and switch wires. Use an electrical multimeter set to AC in the 200V range. Plug the cord in and check for voltage where the cord goes into the switch. If no voltage, replace cord; voltage, move on. If the switch can be locked on do so, otherwise you'll have to have someone hold it on while you check for voltage on the out side of the switch. Again no voltage, replace the switch; voltage move on. If you have power going into and coming out of the switch and the brushes are OK you may have a problem with the armature or field. These have to be tested with a growler to check for shorts. Most electronic shops have one.

Posted on Sep 02, 2010

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Posted on Jan 02, 2017

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It sounds like you probably have a bad spot in the cord. What happens is you get a kink in a spot or you run over the cord and it loses continuity there, but only when it's bent a certain way. Turn it on and wiggle the cord from one end to the other I think you'll find the problem there.
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