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Remove the clip behind the back blade flange holding it on to the housing and lift it up of the return spring, replace the opposite way remembering to relocate the return spring. Make sure you get the model number correct as the 390 and 390k are different.
Make sure the saw is unplugged. Raise the arm to the upper postions and raise the blade guard by loosening but not removing the guard screw. Depress the spindle lock button and use the provided wrench to loosen the blade screw.
A full discription, with illustrations can be found on pg 6 of the user manual. In case you have misplaced the manual here is a link to the pdf from Dewalt. http://www.dewalt.com/FAQs.aspx
click on obtain parts lists and manuals, click the highlighted ServiceNet link and enter your model number. Click the pdf icon next to manual and open the document.
With the saw unplugged -
The blade needs to be locked in place so it will not turn when you put a wrench on the nut located on the left side of the blade that holds the blade on. This is done with a locking pin on the right side of the blade. Push the pin in and rotate the blade by hand until the pin locks into the blade and prevents it from moving. With the pin pushed in put a wrench on the large nut on the left side of the blade and turn it. This may be reversed threaded, so you may have to turn the nut clockwise in order to loosen it.
When tightening the nut after replacing the blade, you will have to once again lock the blade with the same pin.
Perhaps this video will help you locate the locking pin.
was this tool recently repaired? Also check to make sure the blade is installed correctly, Dewalt does not offer wiring diagrams online so I would suggest calling them to see if they can send one as a PDF file to you. But first ensure for proper blade installation and if it has been recently repaired sometimes the field can be installed 180 degree out, also the wiring could be as you think incorrect. I again would call them