My koc-81h4t daewoo microwave convection oven is blowing fuse,i tried to isolate the high voltage area,the griller is working fine,but when im tryin to use the convection,fuse still blows,take note that the high voltage side going to magnetron is already isolated,can you give me an idea on what to do?thanks

Its must be written on the nameplate in atransformer so open it and check

There are three common issues, magnetron, high voltage diode, "sometimes cracks" shorted high voltage capacitor.

Try http://www.manualnguide.com/manual/daewoo-koc985t-microwave-oven/

Hope that helps

If you coffee container had any metallic logos or paint on it sparks will occur. Try to heat water in the glass container.

Chances are if the varistor fails, it fails drastically causing a short circuit across the supply. It will sit across the supply (it will look like a thick ceramic capacitor) and you can check for continuity after isolating that at one end. If it shows low resistance (it should show almost open circuit with a Digital meter), replace it.

It need not be the culprit. If you are familiar working with High voltage circuits ( they are lethal inside a microwave ovens as the current capability is high here), you can discharge the doubler capacitor and isolate the high voltage diode to check for shorts in the HT area.

est the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

Thediode and capacitors can br tested. The capacitor must bealloweddischarge before testing, or you risk to get electrocuted, evenifpower is off. Capacitors can get discharged by shorting theirtwocontacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.



All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

manual required for a daewoo microwave cooker model no. koc-8h4t

You most likely a shorted capacitor which is causing the fuse to blow. This is part of the microwave HV system and isn't in use during convection cycles.

Typically, when the fuse blows in the microwave, the high voltage capacitor fails and becomes shorted.
The door switches are also configured in such a way that if tampered with (in this case, failed switch or latch) the fuse will also blow. Check the capacitor first.

If you need further assistance let me know

Regards,

reg501

The FixYa Team

check high voltage transformer and high voltage diodes, condencer, and magnetron.,