I have a dw733 planer, 12 1/2 inch. While planing one day, the board stopped in the planer. The cutter head was turning, but the feed rollers stopped turning. Just locked up, and will not turn, even with the machine unpluged. I took the cutting blades out ( needed changing anyway), but connot see an easy wat to find out why the rollers stopped. I do not have a repair manual, so I'm not taking anyrhing apart without one. Any help will be helpful. Thanks WG Anderson, Hartwell, GA.