• ** 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

Fan not shutting off

jimg3

Premium Member
Joined
Oct 22, 2014
Messages
3
Location
United States
Model Number
NN-SN968B
Brand
Panasonic
Age
1-5 years
Woke up to fan running running on microwave. When opening the door - fan stops & light turns on. Pressing start (door closed of course) turns on light, carousel turns, food heats. Just the fan won't stop. Tested micro-switches with a multimeter - all seem to be operating correctly.

Disconnected the thermostat - fan (and everything else) turns off. Any suggestions welcome.
 

jeff1

Appliance Tech - Moderator
Staff member
Joined
Oct 10, 2004
Messages
24,008
Location
Ontario, Canada
Hi,

Still sounds like a door switch, door key, door switch mechanism issue.

component2.JPG

jeff.
 

jimg3

Premium Member
Joined
Oct 22, 2014
Messages
3
Location
United States
Thanks for the chart Jeff. Not quite sure how that maps to my actual switches.

interlock-switches.jpg

And here are the multimeter results.
results.jpg

Not sure on where the HV Transformer is, so I didn't perform that test.
 
Last edited:

jeff1

Appliance Tech - Moderator
Staff member
Joined
Oct 10, 2004
Messages
24,008
Location
Ontario, Canada
2 should open and 1 close when the door is opened, 2 should close and 1 open when the door is closed. If they check ok, leave a bad board as prime suspect....not overly common as the switches/switch mechanism!

jeff.
 
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