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Old 06-27-2022, 08:43 AM   #1
Nevillet
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Join Date: Sep 2019
City & State: Southampton
My Country: United Kingdom
I'm a: Knowledge Seeker
Posts: 247
Default Microwave advise please

Hi All,

I am trying to diagnose a faulty microwave oven and have checked the following components.

Transformer – The primary and secondary windings have low resistances and no shorts to earth or between pri/sec.

The high voltage capacitor (1.05uF/2200V) measures fine with no shorts to earth.

The diode is not shorted or open circuit and when connected to a 9V battery drops 4V.

The magnetron has a low resistance across the terminals and has no resistance to earth.

I’ve put a clamp meter around one of the primary lines to the transformer and measured about 4A (240V) when the microwave is ‘on’.

A cup of water in the microwave does not heat in any way.

My gut feeling is that the magnetron is suspect but I’d appreciate any opinions on this.

Many thanks.

Last edited by Nevillet; 06-27-2022 at 09:31 AM..
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