Beth C Loudon , TN June 27, 2023 Appliance: General Electric Microwave PNM1871SM3SS Ge Microwave Pnm1871sm3ss: Turntable wouldn't turn!. How to replace Turntable Coupler. The website stated 93% of the time the coupler was cracked the other 7% was the fault of the motor. Just to be safe, I ordered both parts. Coupler had no problem. We switched out the motor (which we had to remove to look at the coupler) and everything was good as new! Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes