Noise/humming while cooking; especially popcorn; intermitent on other food
I have a Kenmore over the range microwave that I purchased in 6/6 and have had it about 1.5 years. Model 761.80523500 (#80413). It just started making a load humming noise while cooking popcorn. Tried some other stuff like water and it only did it briefly (intermitent).
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TCP is "True Cook Plus" in Kenmore speak.
Here is a cut/paste of a section of the manual.
*CUSTOMIZING TrueCookPlus' You may find that you prefer TrueCookPlus® to cook your food more or less. TrueCookPlus " can adjust to your tastes - to cook your food hotter or cooler - automatically: Example Clear 1. Press the Clear button. (§H§ 1 2. Press the TrueCookPlus® button twice. 3. If you want less cooking time when you enter a TrueCookPlus code, press 1. This will decrease the time by 6%. 345 4. If you want more cooking time when you enter a TrueCookPlus® code: Press 3 for 3% more cooking time. Press 4 for 6% more cooking time. Press 5 for 9% more cooking time. 2 5. Press 2 to reset TrueCookPlus* to factory setting default time. 6. Press the Start button.
I didn't try to clean up the copy
Hope this makes sense and helps.
If your microwave oven won't come on, ensure that the power
cord is plugged into an outlet and that the power is on. Replace any
blown fuses, and reset a tripped circuit breaker. If the microwave won't
run, see that the door is completely closed and that nothing is stuck
in it. Ensure that your door is not broken. Replace if necessary. See
that you have not started the timer as opposed to the cooking function.
Press "Start/Enter" to start your microwave.
Your display will flash if your power goes out. You must
reset the clock. If you do not hear a tone at the end of cooking, ensure
that you have enabled the audible tone. Also check that you are using
the right command. If your power goes out while your food is cooking,
you must reset both the cooking time and clock.
If you see sparks while you are cooking, remove any metal
objects or plates with silver or gold trim. If your food is taking too
long to cook, ensure that you have selected the correct power level for
the food item. Remove any other appliance from the 20-amp circuit line.
Additional appliances on the same amp will draw too much power away from
the microwave. Also ensure that you have selected the correct food item
in the preprogrammed menu. Each microwave has its own error codes.
Always read your manual to determine what the error code means. Examples
of error codes include "E-11", "E-12" and "E-13." This means that you
have a defective sensor, and you must get your microwave serviced. The
"SE" error code indicates an issue with your control panel.
You may hear gear noises, especially a humming noise; the
fan will automatically come on while your food is cooking. If your
turntable plate makes noise, first clean it, and then see that it is
positioned correctly over the roller ring. If your nearby appliances are
experiencing electrical interference, move your microwave farther away
to correct this problem.
Remove the case and see if you can localize the smell. Likely suspects are a shorted high voltage diode (replace) or a shorted stirrer bearing (replace stirrer)--a fan-like device located within the sheet metal waveguide near where the microwaves enter the cooking cavity. Make sure to have a cup of cold water in the cooking cavity when looking for problems. The problem could also be the high voltage transformer or the high voltage capacitor, but these are more rare problems. There are no radiation problems with the case off, but there are high voltages associated with the magnetron and it's power supply.
You either have a bad magnetron tube (5 or 10 year parts warranty item through GE Factory Service 1-800-432-2737 or www.geappliances.com) or a shorted high voltage rectifier. I think the light being out is a secondary problem.
Because the microwave energy is beamed into the interior of the microwave and then dispersed by a metallic "stirrer," the pattern of the energy can be fairly consistent, rather than completely random. But this pattern sometimes causes certain portions of the food to overcook (creating tough spots) and others to undercook. A microwave oven with a carousel is far better at cooking the food consistently--the pattern becomes quite random while the carousel is turning.