• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

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

zigner

Premium Member
Joined
Apr 25, 2010
Messages
13
Location
usa
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

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
44,306
Location
Murray, Utah 84107, United States
Check the door switches for continuity. Check them by opening and closing the door. Be sure to unplug the machine first.
 

zigner

Premium Member
Joined
Apr 25, 2010
Messages
13
Location
usa
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.

1590857992875.png



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.

1590858195681.png
 
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zigner

Premium Member
Joined
Apr 25, 2010
Messages
13
Location
usa
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.
 
Last edited:

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
123,923
Location
McMullen Valley, Arizona
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.

Appliance Tech
Staff member
Joined
Oct 9, 2004
Messages
4,364
Location
Ontario, Canada
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

Premium Member
Joined
Apr 25, 2010
Messages
13
Location
usa
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.
 
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