Microwave turntable NOT Working

Microwave oven

New Jenn-Air over the range Microwave Model # JMV8208BAW when the customer wanted to reheat his coffee the turntable would not move back and forth as it was has done for the the last three months. The customer calls Jenn-Air for service.

When I arrive I first check for a no/off turntable button as some microwaves have a option to stop the turntable. A useful option if you have larger plates that do not have room to move around or back and forth as this does. No option button on this one. So there is a failure in the turntable circuit… I when straight to the turntable motor PN# DE31−00040A easy to get to just remove the four screws on the bottom and drop the bottom down. unplugged the motor and checked for continuity or a short in the motor. all tested good . So I plugged my meter into the wires that supply power to the motor grabbed a glass of water and put it into the microwave oven as an empty microwave oven will have no place for the microwaves to go.. And they could go back into the wave guide and destroy the Magnetron PN# W10126786. Started up the microwave oven and no power at the turntable motor. I have to go deeper. Remove the two screws on top that hold in the grille assembly . I removed a single screw that holds the control panel slid it up and the control panel will hinge open. Checked the wire diagram power for the turntable motor runs in series with the fan motor checked it for continuity or a short in the fan motor. The fan motor was open or An incomplete electrical circuit . the oven needed a need fan motor.

Replaced the fan motor PN# DE31−10177E. Plugged in the new fan motor. Put the oven all back together. And now the customer can reheat his coffee and the turntable plate will move back and forth. Goes to show you that one part can effect another.