Microwave Oven repair?

[ProDave]

Has anyone tried one?

I have a built in AEG combination oven, the microwave does not work. so I thought I would have a look.

There does not appear to be very much that is servicable.

The high voltage diode tests okay.  There was a 5kV 800mA fuse that had blown.  In spite of being labelled 5kV it looked no different to any other 1 1/4" glass fuse. So I put the nearest I had, a 1A fuse in there.

Still the microwave is not working but the new fuse has not blown.

That's about as far as I have got.  Is there anything else I can try before I scrap it?  My guess is the magnetron has failed and that is what blew the fuse?

 

[septiclecky]

Probably cheaper to get a new one than buy a mew magnetron, thats if you can get one

 

[Geoff1946]

Had the fuse failed on overload, (usually vapourising the wire and metalising the glass), or was it clean?  They can just fail from ageing, though I would have expected it to work again when replaced.

If it blew the fuse, then doesn't blow a replacement, I would guess the transformer secondary has gone OC too.

 

[ProDave]

The fuse blew clean, no vapourising.  I will do some continuity checks on the transformer secondary. (not something you can test for output voltage easily being such a high voltage)