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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Microwave oven
I have a GE microwave oven that just stopped heating. I have checked
and found the problem to be in the high voltage section. I found the high voltage diode shorted and the high voltage capacitor going bad. I've replaced both of these, but it still does not heat. When I rechecked I again found the diode shorted within 1 minute of running. The magnetron tube was replace 3 months ago and the transformer tests good. The magnetron tube show no short to case. Also no shorts in transformer, and correct ohms on each winding. Has anyone run into this, or have any ideas? Retired |
#2
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Microwave oven
It sounds like the magnetron is shorting or pulling too much current when it
is powered up. Is for myself personaly, when my personal microwave oven fails, if it is not a small easy fault to service, I replace the complete oven. Many of the models now carry a 3 year warranty. If you amortize the cost over the 3 year period, the cost is very cheap. -- JANA _____ "Retired" wrote in message oups.com... I have a GE microwave oven that just stopped heating. I have checked and found the problem to be in the high voltage section. I found the high voltage diode shorted and the high voltage capacitor going bad. I've replaced both of these, but it still does not heat. When I rechecked I again found the diode shorted within 1 minute of running. The magnetron tube was replace 3 months ago and the transformer tests good. The magnetron tube show no short to case. Also no shorts in transformer, and correct ohms on each winding. Has anyone run into this, or have any ideas? Retired |
#3
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Microwave oven
"Retired" writes:
I have a GE microwave oven that just stopped heating. I have checked and found the problem to be in the high voltage section. I found the high voltage diode shorted and the high voltage capacitor going bad. What do you mean by "going bad"? I've replaced both of these, but it still does not heat. When I rechecked I again found the diode shorted within 1 minute of running. Was it heating during that 1 minute? The magnetron tube was replace 3 months ago and the transformer tests good. The magnetron tube show no short to case. Also no shorts in transformer, and correct ohms on each winding. Has anyone run into this, or have any ideas? Retired There's only 4 parts there - HV transformer, HV capacitor, HV diode, magnetron. It's unlikely that the HV transformer could go bad in a way that would not result in a blown fuse or lots of smoke. The magnetron could be defective and show up only with HV applied. What abouut the condition of the waveguide and the rest of the oven? --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#4
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Microwave oven
The capacitor showed a short to case after running for about 2
minutes, but would again test OK after being off for a while. The wave guide and the rest of the oven look A1. The magentron look good also. No ;I got no heat in that 1 minute that I ran it. I had a cup of water in it, and it stayed cold. I am beganning to think it is the magnetron even though I can not prove it. |
#5
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Microwave oven
The capacitor showed a short to case after running for about 2
minutes, but would again test OK after being off for a while. The wave guide and the rest of the oven look A1. The magentron look good also. No ;I got no heat in that 1 minute that I ran it. I had a cup of water in it, and it stayed cold. I am beganning to think it is the magnetron even though I can not prove it. |
#6
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Microwave oven
On 17 Apr 2006 06:40:14 -0700, "Retired"
wrote: The capacitor showed a short to case after running for about 2 minutes, but would again test OK after being off for a while. The wave guide and the rest of the oven look A1. The magentron look good also. No ;I got no heat in that 1 minute that I ran it. I had a cup of water in it, and it stayed cold. I am beganning to think it is the magnetron even though I can not prove it. I used to fix them years ago. I made a resistive divider which I could use to measure the high voltage at the cathode using a conventional voltmeter. If the heater windings are OK and the voltage is about 2500 (IIRC) then replace the magnetron. Cheers. Bill. |
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