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Dremel 395 won't turn on Expand / Collapse
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Posted 8/19/2007 8:50:17 PM
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My Dremel 395 won't turn on. It was working fine last time I used it, but now it is dead. It's like it's not getting power, but I have ruled that out; their is power at the receptacle.
Post #2571
Posted 8/20/2007 7:00:24 AM


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I would check the brushes in it and make sure they are not wore out. Just unscrew the black caps on each side to check them If you have run your tool for more than 50 or 60 hours most likely the brushes need changed only use Dremel brushes also if the end is pitted it needs replaced. If you do replace them run the tool under no load for 5 min full speed.

How old is the tool?

Doug


Post #2572
Posted 8/20/2007 4:18:22 PM
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I checked the brushes and they look OK. I bought the tool in 1991. Someone else suggested replacing the switch. Which is cheaper?
Post #2574
Posted 8/20/2007 5:54:47 PM


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I'm not sure but someone told me that the switch was around $35.00 witch is cheaper than a new tool. You might check with Dremel service and repair.

Doug


Post #2576
Posted 8/21/2007 7:34:16 AM


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One thing I would suggest is to just clean all of the contacts,  the contacts for the brushes, the switch contacts, etc. 

Many times I have had something not work at all due to a dirty contact, especially if it is in a dusty environment.  It might save you some money.

I don't know which contacts are sealed, and which ones are exposed, but it is worth a try.

There is my 2 cents worth!

Barry

If you live to love, then you'll love to live!

Post #2578
Posted 9/2/2007 7:28:33 AM
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Here is a previous post that I had saved. Roto Variable speed: Repair I carefully removed the 4 torx head screws and the hanging clip and eased the 2 halves apart. Not expecting anything to drop out, I was startled when something inside bounced onto the floor. I quickly found this mystery metal piece and proceeded with my exam. Not seeing anything that appeared to be broken (switchwise), I grabbed a can of WD40 and sprayed the switch and bearing areas. After figuring out where the piece went that had fallen to the floor on disassembly actually it was the metal button used to hold the shaft when changing bits), I carefully assembled the ailing patient, tightened the screws and plugged it in for a test run. To my delight, not only did the unit function as it was supposed to speed control working) but the unit sounded better. Not rough like it had previously. ANOTHER: Did your variable-speed tool stop being variable? If so, the speed control's contacts are probably dirty and oxidized.
Here's how to fix it. Remove the brushes and carefully take apart the tool's case halves. Remove the motor assembly from the case halves and place the switch in the off position.
Spray out the switch contacts area with electric motor cleaner aerosol. You can also clean the commutator area while you’re at it. Let it dry and then spray some CAIG DeoxIT spray onto the switch contacts area. Re-assemble the tool and hopefully you’re back in business. You can get electric motor spray from any automotive parts store but the best
ones are the ones for RC cars from the hobby stores because it is less harsh and cleans just as good. The CAIG DeoxIT can be found in specialty electronic supply stores. DeoxIT
cleans, deoxidizes lubricates and protects electrical contacts and also improves conductivity.
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