Verify that the planer is plugged in and that the parts are in place if the planer won't run. Some parts need to be installed as a safety measure before the machine will run. These can include the dust shroud and top cover. Check that they are seated properly.
Change the electrical brushes if you continue to have problems running the planner. Remove the top cover of the planer and look for the brush cap. It will be adjacent to the coil-like part in the middle of the motor. On the DW735, it's in the right rear of the unit. Remove the worn brushes and put new brushes in their place. Replace the covers and run the planer for 10 minutes to seat the brushes.
Clear the dust shroud of debris if chips don't eject from the rear of the unit. The dust shroud and fan must be clear of debris and the shroud must be in place.
Reduce the depth of cut if the circuit breaker keeps tripping. Turning the crank clockwise lowers the cutter head and counter-clockwise raises it. On the DW735, one turn equals 1/16 inch. Let the planer rest for a couple of minutes and then press the reset button.