🚨 Root Cause & Troubleshooting Guide
Microwave Sparking and Arcing Inside: Burned Waveguide Cover Fix
Identified Root Cause:
Food grease carbonization on the mica waveguide cover plate, creating conductive carbon tracks that arc in microwave RF fields.
Food grease carbonization on the mica waveguide cover plate, creating conductive carbon tracks that arc in microwave RF fields.
Step-by-Step Diagnostic & Resolution:
1
Immediately stop microwave operation to avoid permanent magnetron antenna meltdown.
2
Examine the cardboard/mica rectangular sheet on right interior wall: look for black burn spots or holes.
3
Unclip or unscrew the burned waveguide cover and thoroughly clean baked-on grease behind the cavity.
4
Install a fresh universal mica sheet (cut to size) and always use covered microwave-safe glass containers.
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