see this cuases and fix it. God bless you
Microwave Runs, but no Heat OK, get ready, this micrwave oven
repair can take some time. This is where you must be able to read a
wiring diagram and do some "live" checks on parts. First easy check is
to make sure power is coming off your control board at the MW relay.
Make sure of the wires and test here, if you have 120 volts at this
point, you have ruled out a lot of parts that could be the problem. You
have now ruled out any switch problems, control board problems, or a
thermostat or 2.
If you do not have power from that MW relay on
the control board, you must trace the wiring back to see if the proper
voltage is going through your switches, any thermostats, and arriving at
your control board. Your wiring diagram on your sheet will show you
where and what to test. Below is a general switch test troubleshooting
guide.
If the proper voltage is coming into your control board and you are not
getting voltage at the MW relay, then you need to replace the control
board. If voltage is interupted by a thermostat or switch from your
testing to the control board, then replace that part.Now, testing from the MW relay on to your transformer, high voltage capacitor, magnetron, and diode.
Do not
do any voltage reading from the secondary side of the transformer on,
this can be a deadly microwave oven repair if you do not follow
directions. This can result in
electrocution and the
"blowing-up" of your voltmeter, only do OHM testing with the power off
and the capacitor discharged. Someplace in this circuit, usually before
the transformer, you will have another thermostat to test. It is
usually mounted on the magnetron. Do a quick OHM test to see if it is
open or closed.
Now to test either the transformer, high voltage
capicitor, magnetron, and diode, you must test each part separately. A
good rule of thumb, if your capacitor is bad, change the diode also.
Another note, if you are working on an OTR model and you have determined
to be one of these "heating" circuit parts, you can not test these
parts until you take the unit down. If you don't have the parts with
you and you have to order them, order the magnetron, capacitor and diode
and you will have a 90% chance of solving the problem. If it is an
older microwave, order the thermostat also, most times you can return
un-used, un-opened parts. Check with your parts supplier. This way you
only have to take the unit down once.
To test these parts, scroll
down this page and you will see a chart with component tests. Follow
the instructions to find which part(s) are defective in your microwave
oven repair.
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