In response to "low voltage" : Confused: If the replacement motor (DA31-00146B) only turns @ a max. RPM of 1385, that's all your going to get, even with the correct voltage. The motor that came out of the unit turns @ a max. RPM of 2770. Explain ?
Answer Hello Flo. The Max RPM is irrelevant in this situation. Here is why. The fan motors are 2 speeds, with a maximum of 600 RPM by the board. Thus, you said it was running 1/2 the speed. If so, it is running 300 RMP. The fan motor should be getting 7 to 12 VDC from the board. If not, the board is bad.
The max RPM is never reached on either fan motor, thus the lower max on the new motor. If it gets above 600, the board is suppose to slow the motor down. If it is running 1/2 RPM's slower than the new motor, like you advised in the first post, you will need to check the voltage to the new motor. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html