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Model: PANASONIC 1100W	Brand: -other-	Age: More than 10 years
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asdf25		#1 Posted : Wednesday, August 27, 2008 7:38:03 AM(UTC)
Rank: Member Groups: Registered Joined: 8/27/2008(UTC) Posts: 4		Last week the microwave stopped heating, but everything else was working fine (timer, fan, light etc). So I found out that the diode was bad and replaced it. It started heating perfectly. Today again, there is no heat, but everything else is working. What could be wrong, besides the diode? Did I just get a bad diode that shorted again? or is there something else that drove the diode out in 1 week? Please help.


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abadfish66		#2 Posted : Wednesday, August 27, 2008 7:40:21 AM(UTC)
Rank: Advanced Member Groups: Senior Expert Joined: 5/28/2008(UTC) Posts: 1,620		Could be your magnetron tube, but first make sure the diode ground is good, and not loose.


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asdf25		#3 Posted : Wednesday, August 27, 2008 8:39:07 AM(UTC)
Rank: Member Groups: Registered Joined: 8/27/2008(UTC) Posts: 4		Originally Posted by: abadfish66 Could be your magnetron tube, but first make sure the diode ground is good, and not loose. By magnetron tube, do you mean the entire magnetron unit?


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abadfish66		#4 Posted : Wednesday, August 27, 2008 9:22:22 AM(UTC)
Rank: Advanced Member Groups: Senior Expert Joined: 5/28/2008(UTC) Posts: 1,620		Yes, it is only 1 part so yep the entire magnetron unit


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asdf25		#5 Posted : Friday, August 29, 2008 4:47:07 PM(UTC)
Rank: Member Groups: Registered Joined: 8/27/2008(UTC) Posts: 4		Originally Posted by: abadfish66 Yes, it is only 1 part so yep the entire magnetron unit Thanks for your help earlier. Here is an update. I can't understand whats happening, something weird. I removed the new diode (that I thought had gone bad in 1 week), and got it replaced from the parts store. Before putting the 2nd new diode in I connected the original diode as an experiment, and the microwave started heating again!!! What I gather from this is that the original diode was fine, but the process of disconnecting and reconnecting the diode seems to bring the heating back to the microwave. Almost like something resets once the diode is disconnected and reconnected. Any ideas what might be happening? I also checked the magnetron and it appears to be fine.


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asdf25		#6 Posted : Friday, August 29, 2008 4:49:03 PM(UTC)
Rank: Member Groups: Registered Joined: 8/27/2008(UTC) Posts: 4		Sorry, I forgot to mention that per your suggestion, I had checked to make sure that the diode ground was tightly connected before removing it and experimenting with the original diode.


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