GE Advantium PSB11001NSS Microwave made a pop noise an no longer heats.

[Grumpy_Mike]

The capacitor, transformer and magnetron, using a muti-meter, all show the correct ohms resistance  based upon the specs included in the Technical Service Guide I found online.  This Guide was for a little older version of the oven but looks to be largely the same.

The Diode when connected to a 9volt battery shows 5.75 v the correct direction and hooked up backwards 20 mv.  I suspect that is ok.

The 20 amp fuse it good.  The door interlock and monitor switches all work properly.

I cant find anything wrong in the various components based on what I know to look for.

With the cover off when the microwave is started, there is an arc (pop) between the low voltage heating circuit wire and the top of the transformer.  This is connected to the same post on the Magnetron as the lead from the capacitor.  All the diagrams I found refer to it as F.

Only thing I can think of is that, despite the magnetron testing as .2 ohms consistent with the documentation, it is something within the magnetron.  And that the shortest path is then back through the insulated wire to the top of the transformer.  But, in my pea brain I don't understand why it is a single arc/pop and then nothing.

Anyone have any thoughts?

 

The primary circuit on the transformer =.5 ohms

Red lead from the transformer is 90ohms to ground.  Documentation states 87.  Is 3 ohms significant?

No leads from the transformer are improperly shorted to ground.

neither post on the capacitor or magnetron are shorted to ground.

If I measure the ohm resistance between the posts on the capacitor it does show 11 m ohms.  I'm assuming it related to the internal resistor.  If I check for continuity between the posts on he capacitor it shows 0.

I've attached a picture indicating where the arc occurs. 

[Grumpy_Mike]

Just realized I have an extra digit in the pn.

PSB1001NSS 01 is correct.