"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.