BeerBrewer Posted June 7, 2017 Report Share Posted June 7, 2017 I was using my new 2016 Christmas Present, a Dewalt 788 Scroll Saw, a couple weeks ago when it started to act strange. I was cutting 3/4" oak at about medium to high speed, when all of the sudden the saw slowed down to a crawl all by its self, barely going up and down at all. No matter what I did I could not raise the speed back up. I turned the speed adjusting knob up and down, lightly tapped on it with my finger, gently pressed in it, basically nothing helped. Turning it off and on didn't help either. Also I was only cutting for 5 to 10 minutes at the time, so I so don't think it was over heated. As I sitting there looking at the saw working all by itself in ultra slow motion, I'm thinking to my self "Oh no, now I have to deal with Dewalt's repair center". All of the sudden the saw just started working again and did so for a few hours. This happened a bunch of times too and each time the saw seemed to have a mind of its own. Sometimes it would act up immediately, other times after an hour of so and sometimes it ran perfect all day. Thankfully, I was able to finish the scroll work on my current project and now that I'm between projects, I think I should address the issue. I'm no scroll saw expert, but this appears to be some sort of an electrical problem. Before I go to Grizzly Tool (where I purchased it) and Dewalt about this issue, I thought that it would best to consult you folks first. Has anyone experienced this issue with a Dewalt 788? If so what did you do about it? Does anyone have any ideas on how I figure out whats wrong? As always, your help is appreciated. Bob Quote Link to comment Share on other sites More sharing options...
JTTHECLOCKMAN Posted June 8, 2017 Report Share Posted June 8, 2017 Could be a cold solder joint on the circuit board. Or a wire that is not seated all the way or a splice that is loose. That would be where I look first. Quote Link to comment Share on other sites More sharing options...
CharleyL Posted June 8, 2017 Report Share Posted June 8, 2017 While your saw appears to still be in warranty, take it to DeWalt for service. If I had to guess at what your problem is, I would say that the speed control board it bad, but it could also be a bad motor or something else. All are expensive, so let DeWalt fix it for free, if you can. The speed control board is about $70 and the motor about $250 if you have to buy them yourself. Don't wait until it's too late and the warranty expires. Charley Quote Link to comment Share on other sites More sharing options...
ike Posted June 8, 2017 Report Share Posted June 8, 2017 If it is under warranty take it to a factory repair station that honors Dewalt warranty If not . If not under warranty and they repair it it will coat about $250. IKE Quote Link to comment Share on other sites More sharing options...
amazingkevin Posted June 11, 2017 Report Share Posted June 11, 2017 aways something Quote Link to comment Share on other sites More sharing options...
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