DeWalt DW621's electronic unit failure

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Forum topic by mikfed posted 04-15-2013 08:06 AM 3036 views 0 times favorited 5 replies Add to Favorites Watch
View mikfed's profile


2 posts in 2478 days

04-15-2013 08:06 AM

Hi everybody!

First of all, I would like to point out that English isn’t my native language so please excuse my possible mistakes.

Yesterday my DW621 wouldn’t turn on. I removed some covers to check for loose contacts, dust, etc. Nothing helped. Then I took two pieces of wire and connected th on/off switch directly to motor terminals. The router started working but as you understand without speed regulator, soft start function and the function of maintaining constant speed under load.

The question is: do I do any harm to my router by using it with this quick repair solution?

Thanks in advance for any answers.\

5 replies so far

View ajosephg's profile


1882 posts in 4170 days

#1 posted 04-15-2013 01:13 PM

I can’t think of anything that would harm your router under those conditions.

In reality you most likely would always run the router at its maximum speed anyway, because the slower speeds are only for very large bits. In my opinion the soft start and speed regulator are not essential in any case.

-- Joe

View NiteWalker's profile


2741 posts in 3186 days

#2 posted 04-15-2013 04:25 PM

After the magnetic rings in my dewalt 618’s bit the dust I was left with single (full) speed routers and have been using one of them this way since. No issues.

-- He who dies with the most tools... dies with the emptiest wallet.

View Marty5965's profile


161 posts in 2555 days

#3 posted 04-15-2013 04:39 PM

I believe the soft start and variable speed is controlled by an electronic module that is user replacable. That may be your problem. You can order a new one from Dewalt but it may not be cost effective if your router is old. I wouldn’t think you would harm your router specifically but you would lose the safeguards that the variable speed module provides. You could ask over on the dewalt router forum.

-- Marty, Wilmington, OH, learning every day....

View Loren's profile


10477 posts in 4257 days

#4 posted 04-15-2013 05:32 PM

That router is an old Elu design. It’s one of the better mid-sized
plunge routers out there. The speed control is known to
give out on it.

View mikfed's profile


2 posts in 2478 days

#5 posted 04-17-2013 02:32 PM

Thanks for the comments!

I have called to my local service outlet and ordered this module.
They promised to deliver it for a quarter of the price I payed for the router.
Meanwhile I continue working with it.

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