• ** 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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FIXED 790.48803100 F84 Code - Light does not come on in microwave

Loinest76

Premium Member
Joined
Dec 18, 2021
Messages
16
Location
Louisiana
Model Number
790.48803100
Brand
Sears Kenmore
Age
1-5 years
F84 code microwave oven not working, Light does not come on in microwave I checked all fuses in microwave all good door switches all good also and I checked low voltage transformer also checks good not sure what electronic control is bad there is a main relay board a display board and the microwave electronic boars
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
44,793
Location
Murray, Utah 84107, United States
Check for 120 VAC across J1-1 and J1-2 on the relay board. I'll check for the wiring diagram. If you have yours can you post a copy?
 

Loinest76

Premium Member
Joined
Dec 18, 2021
Messages
16
Location
Louisiana
Do you think it’s a problem with the microwave oven board or the relay board I check the low-voltage transformer that plugs into the microwave board and it ohms out good
 

Loinest76

Premium Member
Joined
Dec 18, 2021
Messages
16
Location
Louisiana
I found a blown Buss 20 amp external fuse have it on order not sure what caused it to blow
 

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Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
128,974
Location
Redmond, Oregon
Rick is under the weather, hopefully he will be back soon.

Let us know how it goes after you replace that fuse.

Jake
 

Loinest76

Premium Member
Joined
Dec 18, 2021
Messages
16
Location
Louisiana
This fuse Is part of the microwave oven combo the problem was a blown fuse and a bad door interlock door switch
 
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