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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Old September 28th 04, 01:28 PM
Sidney
 
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Default 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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Old September 28th 04, 01:42 PM
Sam Goldwasser
 
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(Sidney) writes:

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.


You may have to just replace it (or bypass it if only testing) to see if
anything else is actually bad. It was there to detect overheating of the
magnetron. There can be many causes of that, or it may have just died
for no good reason.

Take care in there!

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Old September 29th 04, 05:50 AM
James Sweet
 
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Default


"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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