Panasonic NN-SN973S Microwave turntable runs for a minute, slowly, after oven turns off

[zigner]

Model Number

NN-SN973S

Brand

Panasonic

Age

1-5 years

In my searching, I see no mention of the issue for any microwave, like I am experiencing. The microwave turns off, we open the door, light comes on, but turntable keeps turning slowly for a minute or so. When I unplug it, the spinning stops immediately. Any ideas? Obviously it is concerning that this is using power while the oven is off, so we are keeping it unplugged.

 

[rickgburton]

Check the door switches for continuity. Check them by opening and closing the door. Be sure to unplug the machine first.

 

[zigner]

Thanks for the advice.

I checked out the 3 switches and they all seem fine from a continuity perspective.

More detail on symptoms, whenever door is open, turntable spins slowly, and light is on (that part is expected). Soon as door closes, turntable stops, and light turns off. As far as cooking, everything works fine, and microwave stops at end of timer, or when door is opened.

I took pictures of the connection points where the two brown wires originate, that lead to the turntable motor.

First pic, blue and brown wire attach to one of the two connect points on this two connector component, left center.

The other wire to the turntable motor connects in the connector with the two blue wires, towards the back, here. The brown one is blurry. Other brown wire in front connector does not lead to turntable motor.

 

[zigner]

More detail about the turntable symptoms. Almost entertaining how it seems to have a mind of its own.

Lately, after finishing cooking, and opening the door, it turns about a rotation or two, while keeping the door open, then stops. After that, if I close and reopen the door, without running the microwave, it starts turning again.

 

[Dan O.]

JFYI





.

 

[Jake]

Thanks Dan for helping, Rick had to go out of town for about a week to 10 days. Rick said he would try to come on when he can.

Jake

 

[Dan O.]

I've never heard of such a case myself but from the wiring diagram I can't see anything besides the electronic control being responsible. Maybe a sticking relay??

But, as near as I can see, the magnetron tube might be powered at those times as well. That could be dangerous!

LINK > NN-SN973S Main PCB # F603LBK50AP


Dan O.

 

[zigner]

Thanks for contributing. Of course we have been able to live with this. Just takes some getting used to putting a dish or cup on a turning turntable!

Been trying to note any subtle symptoms. Was trying to see if the turntable would always make just 2 rotations after opening door after a cooking (like it does sometimes), but now it seems to run infinitely when the door is open, both before or after cooking.

I will say, the turntable motion seems a bit uneven when it is doing this. Just a little laggy then jerky at times. Maybe I am reading too much into that. Maybe that's the way it works with the door closed too, but easier to notice watching with door open.