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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 ovens thermal fuse/link/tco
Rival microwave oven model:MT660,year:Sept 16,2003,UL:52LB,made in
China.No power I found an open thermal fuse/link/TCO (thermal cut off) microtemp # G4A00192C (192 degrees Celcius) physically mounted on the side of the magnetron but electrically connected right at the ac line cord.Before I replace it I would like to know if it blew by customer cooking something too hot or is there a part which caused it to fail,as I took my Fluke series II DMM model:29 and measured most components on low ohms range and they tested fine. Note:the reason why I ask is because long time ago I stopped repairing microwave oves as 70% of the ones that used to enter my shop had defective magnetrons and the symptoms were no heating of food or visible sparks and arcs. Oh yeahm,this model has a bake and broil element like a regular kitchen stove and it also has a turntable motor on the bottom.Thanks in advance for tips. Sidney Dartmouth,Nova Scotia Canada http://www.iwaynet.net/~nesda/Oct028.html http://www.iwaynet.net/~nesda/Oct029.html http://www.iwaynet.net/~nesda/May18.html http://www.iwaynet.net/~nesda/SonyAudMod.html http://www.globalsemi.com/sbx1637-11.html http://www.newark.com/product-detail...ge/32-9495.jpg |
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"Sidney" wrote in message om... Rival microwave oven model:MT660,year:Sept 16,2003,UL:52LB,made in China.No power I found an open thermal fuse/link/TCO (thermal cut off) microtemp # G4A00192C (192 degrees Celcius) physically mounted on the side of the magnetron but electrically connected right at the ac line cord.Before I replace it I would like to know if it blew by customer cooking something too hot or is there a part which caused it to fail,as I took my Fluke series II DMM model:29 and measured most components on low ohms range and they tested fine. Note:the reason why I ask is because long time ago I stopped repairing microwave oves as 70% of the ones that used to enter my shop had defective magnetrons and the symptoms were no heating of food or visible sparks and arcs. Oh yeahm,this model has a bake and broil element like a regular kitchen stove and it also has a turntable motor on the bottom.Thanks in advance for tips. Not sure about this particular unit, but I've yet to come across a bad magnetron, usually the fuse is blown from a sticky interlock switch on the door, or there's cracked solder joints on the control board. Not to say magnetrons never fail, but there's plenty of other more common problems it seems. If you have one of those IR thermometers you could put some water in the unit, bypass the thermal fuse with a clip lead and run it for several minutes while checking the temperature of the magnetron periodically, if it doesn't get too high after 10 minutes of running then it's probably ok and you could put a new thermal fuse in. |
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