Makita 3612C Router Burnt Up? Diagnostic Help Please

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Forum topic by bk32 posted 01-10-2013 10:44 AM 1911 views 0 times favorited 3 replies Add to Favorites Watch
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1 post in 1003 days

01-10-2013 10:44 AM

Topic tags/keywords: makita 3612c burnt router speed control field assembly armature assembly

I have a Makita 3612C router (3 1/4 horsepower, variable speed) that I need some guidance with. Earlier today I was doing some easy routing when all of a sudden the router speed changed, I saw some orange sparks inside the router, and the circuit breaker for the outlet I was using popped. The tool was smoking and emitting the typical burnt electrical smell. After I reset the circuit breaker, I did not run the tool again, fearing I might damage it more. My question is: is the router salvageable? I took it all apart and everything looks ok; the brushes are hardly used and nothing looks burnt or melted. I’ve read that the speed controls on these routers are sometimes the cause of this type of problem. I can replace the speed control for $85. Is there any way to check that the field assembly or the armature assembly is good before I buy a new speed control? In case it isn’t obvious, electrical troubleshooting is not my strong suit. I don’t want to sink money into this thing if there are multiple parts that are going to need replacing. Thanks in advance for your help.

3 replies so far

View Nicky's profile


672 posts in 3131 days

#1 posted 01-10-2013 05:21 PM

Of course there are ways to check the armature assembly. It requires special test equipment.

If this were me, and not being comfortable or knowledgeable enough about the inner workings of a router with an electronic speed control, I’d send it to a qualified service center for repair. Of course it will cost more then performing the repair your self, but it may be more cost effective. If you replace the speed control, and don’t know for sure that its your problem you run the risk of ruining an $85 part. You could just ask for an estimate at the service center and take it from there.

-- Nicky

View pintodeluxe's profile


4100 posts in 1853 days

#2 posted 01-10-2013 06:38 PM

Sounds like the armature that controls the variable speed has failed. If you can repair it, it might be cost effective. If you have to take it to a shop, you might as well go shopping for a new router. has reliably delivered parts to me on many occasions.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View wunderaa's profile


225 posts in 1242 days

#3 posted 01-10-2013 06:56 PM

Take a look through this. If I were you, I’d bypass the speed control temporarily and see if it’ll work. If so, permanently bypass it and buy an external speed control. $85 is steep for an OEM fix!

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