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microwave oven Fuse blew, replacement blew too after 1\2 second

paulmars

Aug 30, 2016
10
Joined
Aug 30, 2016
Messages
10
Following common resistance test procedures found on the web the magnetron and transformer are fine.

The big capacitor tests open. The diode attached to it reads mostly open in one direction, although sometimes my dvm will jump down to several meg ohms for a fraction of a second. Testing in other directions reads a constantly changing value of 5xxMeg to 8xxMeg.

Would these cause the fuse to blow?

Emerson mld mw8987b

Tks,
Paul
 

Bluejets

Oct 5, 2014
5,995
Joined
Oct 5, 2014
Messages
5,995
One cannot test a HV microwave diode with a conventional "diode test" on a multimeter.

Video not English but easy to follow..... first diodes are ok....last one is shorted.

 
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