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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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Microwave not Heating
I have a pair of virtual twin GE's, 1600 series, that aren't heating.
All else appears to be normal. I've replaced the HV diodes with no luck. After discharging, all resistance checks appear to be normal. HV side 70 ohms, primary 1, open to chassis. Filament, 1, open to chassis. Cap is hard to measure. I have a cheapie analog meter that only does x1000, I get a very slight needle deflection when across the cap terminals followed by an immediate return to open. My digital meter has a very slow response time. I see it changing scales from M to K but by the time it shows a number it is back to M (the internal resistor of the cap). Both terminals open to cap case. When running there is a slight to moderate hum. An inductive voltage tester shows lots of power on the HV xformer, and it cycles with the power relay when set to 100% on. The hum cycles with the voltage presence. I'd guess either cap or magnetron, any suggestions? On one of the units, the HV diode was shorted (nothing visible) while as the other one did not test as shorted. Thanks. |
#2
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Microwave not Heating
Backhand writes:
I have a pair of virtual twin GE's, 1600 series, that aren't heating. All else appears to be normal. I've replaced the HV diodes with no luck. After discharging, all resistance checks appear to be normal. HV side 70 ohms, primary 1, open to chassis. Filament, 1, open to chassis. Cap is hard to measure. I have a cheapie analog meter that only does x1000, I get a very slight needle deflection when across the cap terminals followed by an immediate return to open. My digital meter has a very slow response time. I see it changing scales from M to K but by the time it shows a number it is back to M (the internal resistor of the cap). Both terminals open to cap case. When running there is a slight to moderate hum. An inductive voltage tester shows lots of power on the HV xformer, and it cycles with the power relay when set to 100% on. The hum cycles with the voltage presence. I'd guess either cap or magnetron, any suggestions? On one of the units, the HV diode was shorted (nothing visible) while as the other one did not test as shorted. I'd go with magnetron or bad filament connections but I assume you checked those. The HV transformer wouldn't fail in a way that didn't result in smoke or blown fuses. The cap is more likely to short than open and you do get some response on your DMM. You could compare it to a normal 1 uF capacitor. --- 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 is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#3
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Microwave not Heating
On or about 24 Oct 2005 15:53:51 -0400 someone/thing calling
him/her/itself Sam Goldwasser inked the following: I'd go with magnetron or bad filament connections but I assume you checked those. The HV transformer wouldn't fail in a way that didn't result in Ok, I finally had time to get into it and upon removal of the magnetron found the antenna nicely burned up, a good 1/4 inch hole eroded on the top/side. Called GE wholesale parts (888 239 6832) and they are sending me the mag/stir kit under the 10 yr. warranty. Do you think I should get a leak test done? I've not touched the waveguide or the door at all so it should still be intact. Thx. |
#4
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Microwave not Heating
Backhand writes:
On or about 24 Oct 2005 15:53:51 -0400 someone/thing calling him/her/itself Sam Goldwasser inked the following: I'd go with magnetron or bad filament connections but I assume you checked those. The HV transformer wouldn't fail in a way that didn't result in Ok, I finally had time to get into it and upon removal of the magnetron found the antenna nicely burned up, a good 1/4 inch hole eroded on the top/side. Called GE wholesale parts (888 239 6832) and they are sending me the mag/stir kit under the 10 yr. warranty. Wow, I'm impressed they didn't give you too hard a timea bout you're being killed and suing..... Do you think I should get a leak test done? I've not touched the waveguide or the door at all so it should still be intact. The party line says yes. As a practical matter, if you haven't touched the door seal, there won't be any issues with leakage from the front. --- 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 is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
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