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#1
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Basic Microwave Repair?
On 07/03/2010 05:29 PM, Chief Two Eagles wrote:
On Sat, 03 Jul 2010 15:20:18 -0700, Ulysses wrote: Hi everyone. I read many web sites about testing and repairing microwave ovens and have concluded that my Sharp microwave has a bad diode and capacitor. I checked the magnetron and, according to what I read, it's probably OK as I get a reading of about .4 ohms across the terminals and it is not shorted to the case. However, I'm wondering if it is possible to test the magnetron with low voltage DC. I assume that what is usually fed into it is 120 VAC rectified which I think will result in about 170 VDC. If that's the case, then could 12 VDC be used just to verify the magnetron still works before spending money on other parts? I ain't gonna do nothin' 'les someone says it's OK and explains how ;-) The sympton right now is that it buzzes and blows the fuse so I'm thinking an open diode and shorted capacitor results in feeding 60 Hz AC to the magnetron thus causing the buzz. Does that sound right? Thanks. Sounds right to me. If you replace the cap and diode why not do the mag too? They sag in output as they age so if you like the oven you have do it justice and replace all three components. Just make sure you don't handle the leads on the capacitor. It can store a nasty jolt. Speaking of capacitors holding a nasty jolt, when I was around 12 years old my dear old drunken, worthless father, that liked to beat and starve me, told me he was going to work on the TV and asked if I thought it would be alright with the plug unplugged. I had heard that capacitors help a charge even when something was unplugged, but I told him, it should be alright. He jabbed a screwdriver in a flopped around for what seemed like quite a while while I stood and watched. Afterward I said "Well imagine that". The TV worked before he started and it worked after he finished, so I don't know why he thought it needed to be worked on. Another time he thought he would work on a light that didn't need to be fixed, and he asked if it would be alright with the switch off or should he turn off the breaker? I told him that as long as the switch was off it should be fine. He stuck a screwdriver in there and was practically doing a jig on the counter top. Again I said "Well Imagine that". The light worked fine before he started and after. I still laugh when I think of those times. Old Geezer And you probably have a shorted diode if it blows the fuse. |
#2
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Basic Microwave Repair?
On Jul 4, 2:42*am, Old Geezer wrote:
On 07/03/2010 05:29 PM, Chief Two Eagles wrote: On Sat, 03 Jul 2010 15:20:18 -0700, Ulysses wrote: Hi everyone. *I read many web sites about testing and repairing microwave ovens and have concluded that my Sharp microwave has a bad diode and capacitor. *I checked the magnetron and, according to what I read, it's probably OK as I get a reading of about .4 ohms across the terminals and it is not shorted to the case. *However, I'm wondering if it is possible to test the magnetron with low voltage DC. *I assume that what is usually fed into it is 120 VAC rectified which I think will result in about 170 VDC. *If that's the case, then could 12 VDC be used just to verify the magnetron still works before spending money on other parts? *I ain't gonna do nothin' 'les someone says it's OK and explains how ;-) *The sympton right now is that it buzzes and blows the fuse so I'm thinking an open diode and shorted capacitor results in feeding 60 Hz AC to the magnetron thus causing the buzz. *Does that sound right? Thanks. Sounds right to me. If you replace the cap and diode why not do the mag too? They sag in output as they age so if you like the oven you have do it justice and replace all three components. Just make sure you don't handle the leads on the capacitor. It can store a nasty jolt. Speaking of capacitors holding a nasty jolt, when I was around 12 years old my dear old drunken, worthless father, that liked to beat and starve me, told me he was going to work on the TV and asked if I thought it would be alright with the plug unplugged. I had heard that capacitors help a charge even when something was unplugged, but I told him, it should be alright. He jabbed a screwdriver in a flopped around for what seemed like quite a while while I stood and watched. Afterward I said "Well imagine that". The TV worked before he started and it worked after he finished, so I don't know why he thought it needed to be worked on. Another time he thought he would work on a light that didn't need to be fixed, and he asked if it would be alright with the switch off or should he turn off the breaker? I told him that as long as the switch was off it should be fine. He stuck a screwdriver in there and was practically doing a jig on the counter top. Again I said "Well Imagine that". The light worked fine before he started and after. I still laugh when I think of those times. Old Geezer And you probably have a shorted diode if it blows the fuse.- Hide quoted text - - Show quoted text -- Hide quoted text - - Show quoted text - He was doing planned preventive maintenence :-) |
#3
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Basic Microwave Repair?
"Old Geezer" wrote in message ... On 07/03/2010 05:29 PM, Chief Two Eagles wrote: On Sat, 03 Jul 2010 15:20:18 -0700, Ulysses wrote: Speaking of capacitors holding a nasty jolt, when I was around 12 years old my dear old drunken, worthless father, that liked to beat and starve me, told me he was going to work on the TV and asked if I thought it would be alright with the plug unplugged. I had heard that capacitors help a charge even when something was unplugged, but I told him, it should be alright. He jabbed a screwdriver in a flopped around for what seemed like quite a while while I stood and watched. Afterward I said "Well imagine that". The TV worked before he started and it worked after he finished, so I don't know why he thought it needed to be worked on. Another time he thought he would work on a light that didn't need to be fixed, and he asked if it would be alright with the switch off or should he turn off the breaker? I told him that as long as the switch was off it should be fine. He stuck a screwdriver in there and was practically doing a jig on the counter top. Again I said "Well Imagine that". The light worked fine before he started and after. I still laugh when I think of those times. Old Geezer Ah, reminds me of my dear old dad ;-) And you probably have a shorted diode if it blows the fuse. |
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