When you're troubleshooting a no-heat complaint in a microwave, one of the components you may need to check is the high-voltage rectifier (called a "rectumflyer" in the trade. )
Trouble is, the junction resistance on these rectumfliers is so high that doing a standard forward and reverse bias test with an ohm meter won't tell you anything because it'll just read open in both directions. This video shows an easy method for testing these special critters:
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