Hi,
Here is a tip that will help you to figure out what is wrong with your Microwave Oven....Microwave Oven Basic Troubleshooting Tipsheatman101
Yes you should replace the fuse which in the control department. You must remove the cover which is one unit the top, left and right panel.
Also sometime the bulb holder wires might have be loose or burned out and been disconnect so this have create an open circuit. So you can have a visual check of these wires but since you have the oven panel removed have a check of loose or overheated wires.
Take care to remove electric plug and avoid come in contact with the magnetron capacitor since this can evacuate instant high voltage and might burn your hands, and this hurts very bad for more than a week.
We have a link with the parts layout of your microwave which can help you.
If there is spark please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is leaking and sparking to the ground. It is quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Now keeping clear switch on , use a cup of water inside to test.
If you notice any buring smell shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.
If there is no heating the magnetron/capacitor/temperature cut off is faulty
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