DW788 Woes - Scroll Saw Woodworking & Crafts Message Board

lonepine · 09-29-2009, 07:56 PM

My DW788 just started blowing fuses (3 amp) (Type 1 from 1997)
Last year replaced the motor $189.00.(made in japan)
The year before replaced the circuit board and rheostat. ($60.00)
I took it apart and checked for short to ground,did not find any, the motor voltage (motor disconnected) was not proper,20 VDC to nothing.
Replaced the Circuit Board and rheostat with the old one, VDC 52 to 96,OK.
Checked brushes, OK, blew out brush holders.
Put back together.
Raised speed and voltage, 3amp fuse blows, changed to 5 amp,still blows.
Called service center... did not know or offer any techinical advice,said to bring it in ,would charge $259.99 to repair.
I suspect the motor is going again,one of the windings grounding out.
Anybody have any suggestions...would appreciate it.
I like the saw but, it is costing too much at this point.

Maybe I should offer it for parts, and buy a Hitachi.

Rob

wood-n-things · 09-29-2009, 08:36 PM

Sorry to hear of your woes. I have no suggestion sorry.

morsewk · 09-29-2009, 11:28 PM

Had mine since 1999. Been in the shop only once and that turned out to be the on/off swith being dirty.

marshall · 09-30-2009, 02:06 AM

I love my yellow Bird , but if I start having your problems I''ll be considering a change probably . I did blow a fuse today for the first time , just replaced it and keep on going . My is made over seas > two years old and going strong so far knock on wood................Marshall

ubgoofy2003 · 09-30-2009, 03:37 AM

Hey, Rob, I thought those earlier models were made in Canada ! I thought when they moved the mfg,ing overseas, they were not as good. Mine has been good to me for two years now. The switch got dust in it & I added a foot switch. Is your saw a '97 year model? If I had that much trouble with one, I would get rid of it & buy something else. Preferably made in the USA. I am getting tired of everything being made out of the country. Hope you can work something out & enjoy your scroll work again. Good Luck. Perk

lucky788scroller · 09-30-2009, 03:53 AM

The only time I have ever blew that lil fuse was when I started the saw with the arm up. If the arm is up and you try to run the saw, the fuse will blow. A simple cure for that..dont have the arm up while trying to run the saw! I assume that isnt your problem though since youve had it happen that much.Sorry I cant offer any more help than that, All of my yella saw are Type 1's too, and have been very good to me.

lonepine · 09-30-2009, 08:03 PM

Dale; You got me wondering if maybe there is a linkage problem...it is possible that a jam even for an instant could cause an overload and blow the fuse...

Rob

lucky788scroller · 10-01-2009, 02:03 AM

Yes Rob, that is possible for sure.

Jim Finn · 10-01-2009, 10:15 PM

Quote:

Originally Posted by lonepine

Dale; You got me wondering if maybe there is a linkage problem...it is possible that a jam even for an instant could cause an overload and blow the fuse...

Rob

That is exactly what mine is doing. The nut that attaches the motor to the linkage inside is a left hand thread and it tightens on start up and locks the motor and then the fuse blows. (I now have a Hegner on order)

Jim McDonald · 10-01-2009, 11:27 PM

Got to take a second and put on the old fireman's hat.

Replacing the fuse with one higher rated is a BAD idea. 3 amp to 5 amp is a 40% jump in the load and some of the wiring may not be able to handle that extra amperage.

Could be that bigger fuse will lead to a smoke test and then--you'll really know where the problem is.

Better option might be to go to a 2 1/2 slow blow.

09-29-2009, 07:56 PM	#1
lonepine Senior Member Join Date: Aug 2004 Location: Western,Penn. Posts: 162	DW788 Woes My DW788 just started blowing fuses (3 amp) (Type 1 from 1997) Last year replaced the motor $189.00.(made in japan) The year before replaced the circuit board and rheostat. ($60.00) I took it apart and checked for short to ground,did not find any, the motor voltage (motor disconnected) was not proper,20 VDC to nothing. Replaced the Circuit Board and rheostat with the old one, VDC 52 to 96,OK. Checked brushes, OK, blew out brush holders. Put back together. Raised speed and voltage, 3amp fuse blows, changed to 5 amp,still blows. Called service center... did not know or offer any techinical advice,said to bring it in ,would charge $259.99 to repair. I suspect the motor is going again,one of the windings grounding out. Anybody have any suggestions...would appreciate it. I like the saw but, it is costing too much at this point. Maybe I should offer it for parts, and buy a Hitachi. Rob __________________ The provide-ance of God is my inheritance

09-29-2009, 08:36 PM	#2
wood-n-things Behave Yourself..I can't. Join Date: Nov 2005 Location: Right here ---silly Posts: 4,471 Blog Entries: 1	Sorry to hear of your woes. I have no suggestion sorry. __________________ The Mike One of them anyway. Don't be so open-minded. Your brains will fall out!

09-30-2009, 02:06 AM	#4
marshall Just love Being Here Join Date: May 2008 Location: Jonesboro AR Posts: 2,109	Dewalt 788 I love my yellow Bird , but if I start having your problems I''ll be considering a change probably . I did blow a fuse today for the first time , just replaced it and keep on going . My is made over seas > two years old and going strong so far knock on wood................Marshall __________________ Usually busier than a cat in a sandbox !!!!!!!!!!! { Dewalt 788 only }

09-30-2009, 03:53 AM	#6
lucky788scroller Senior Member Join Date: Sep 2005 Location: wisconsin Posts: 6,260	The only time I have ever blew that lil fuse was when I started the saw with the arm up. If the arm is up and you try to run the saw, the fuse will blow. A simple cure for that..dont have the arm up while trying to run the saw! I assume that isnt your problem though since youve had it happen that much.Sorry I cant offer any more help than that, All of my yella saw are Type 1's too, and have been very good to me. __________________ Dale w/ yella saws

09-30-2009, 08:03 PM	#7
lonepine Senior Member Join Date: Aug 2004 Location: Western,Penn. Posts: 162	Dale; You got me wondering if maybe there is a linkage problem...it is possible that a jam even for an instant could cause an overload and blow the fuse... Rob __________________ The provide-ance of God is my inheritance

09-29-2009, 11:28 PM	#3
morsewk Member Join Date: Mar 2005 Location: Crete, Illinois Posts: 41	Had mine since 1999. Been in the shop only once and that turned out to be the on/off swith being dirty.

09-30-2009, 03:37 AM	#5
ubgoofy2003 Senior Member Join Date: Mar 2007 Location: Arizona Posts: 486	Hey, Rob, I thought those earlier models were made in Canada ! I thought when they moved the mfg,ing overseas, they were not as good. Mine has been good to me for two years now. The switch got dust in it & I added a foot switch. Is your saw a '97 year model? If I had that much trouble with one, I would get rid of it & buy something else. Preferably made in the USA. I am getting tired of everything being made out of the country. Hope you can work something out & enjoy your scroll work again. Good Luck. Perk

10-01-2009, 02:03 AM	#8
lucky788scroller Senior Member Join Date: Sep 2005 Location: wisconsin Posts: 6,260	Yes Rob, that is possible for sure. __________________ Dale w/ yella saws

10-01-2009, 11:27 PM	#10
Jim McDonald Workin' for the Weekend Join Date: Jun 2008 Location: On the Other Side of the Monitor Posts: 940 Blog Entries: 6	Got to take a second and put on the old fireman's hat. Replacing the fuse with one higher rated is a BAD idea. 3 amp to 5 amp is a 40% jump in the load and some of the wiring may not be able to handle that extra amperage. Could be that bigger fuse will lead to a smoke test and then--you'll really know where the problem is. Better option might be to go to a 2 1/2 slow blow. __________________ Jim Exuberance can be corrected; dullness is incurable. --E. Deters "Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."

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