The door closing will intermittently cause the unit tray to rotate after the door is opened. In looking at the switches activated by the door, there are three (3) switches, but I see only two (2) shown in your diagram. Shown is a door sense and a monitor. Which is the most likely causing the problem. Note: the microwave operates normally after the door is shut positively, that is, "forcefully closed".
ANSWER Hello Chester. You need to test the switches and see which one is bad. You can test these with a multi-meter TJMA-DM1. If the terminal says NC, it should read closed from NC to COM. If it says NO, it should read open from NO to COM. Hope this helps.
Answered by AppliancePartsPros.com | Thursday, March 17, 2011