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mcouyang  
#1 Posted : Tuesday, November 30, 2010 5:38:31 PM(UTC)
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mcouyang

Rank: Member

Groups: Registered
Joined: 11/29/2010(UTC)
Posts: 1

Dear Sir/Madam:

My microwave hood had a problem that when it is turned on, it does not provide heat but comes buzzing noise. I suspect it has at least one of components failed such as HV diode, capacitor, or magnetron. after taking these parts out, I made the test for each of them. The test results are as below: (Meter: Fluke 87)

The HV Diode measure continuity:
-both forward and reverse are Infinity. So it is BAD!

The HV Capacitor:
-terminal to terminal slightly indicates ohms moving.
-terminal to case: Infinity. So it seems Okay

The Magnetron: Measure resistance:
-Filament terminal less than 1 ohm
-Filament to Chassis is about 300 ohms I am not sure if is normal!!

I would greatly appreciate it if you could advise if I should replace the Magnetron and how I can find root cause for the failure of diode and Magnetron.

Best regards,
Ming
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