20 Most Recent Magic Chef MCB780W Microwave Oven Questions & Answers

Make sure that the program controller is working if not checkpower - step down supply, the pads are responding- if not faulty pads- or thedoor switches, if the switch contact are not good then it will not trigger theprocessor to switch on the waveguides. If the lights or fan work without anydisplay or action of program being triggered to start then it can be a possiblefault on the main board or the processor. Sometimes insect secretion can shortthe board and display panel and so the processor can work in such an erraticmanner. If so clean, solder and reset the board. Now identify the parts byclicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html If there is no heatingplease do not switch on unless you have confirmed the fault. It is possiblethat the Magnetron is faulty, the temperature cut off is faulty or the maincapacitor is short. It is also quite possible that insect can get into the ovenand create soft spots. When you switch on these will create a short and makethe voltage jump and in the long run damage the magnetron. Check this link toknow how a microwave works:http://www.espares.co.uk/advice/microwave/a/5/1443/how-a-microwave-oven-works.html So Remove cover after disconnecting , check for dirt/moisture inthe cabin, if so wipe clean and dry, check the magnetron and area clean and usean jet air to clean off. Check the wave guide covers, if food had deposited
then it must be checked or replaced. See link: http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html Now keeping clear of the microwave, switch on; use a cup of waterinside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor canbe faulty. replace with same type.
If there is heating without any issues, you can use the microwave safely

Magic Chef... | Answered on Jul 04, 2012

Yes, that is normal... no problem...


Magic Chef... | Answered on Aug 13, 2011

Repairclinic.com carries a replacement glass tray for your microwave for about $23. Just type in your model number and you will find the tray listed as item 1206615. I hope this helps you.

Magic Chef... | Answered on Dec 15, 2009

sounds like a fuse for starters, remove outer cover there will be a white cartridge appx 1"longX1/8"dia this is a ceramic fuse avail at most hardware stores in 15 or 20 amp configurations, if this blows again after repl suspect a faulty H.V. Diode/H.V. Capacitor, or the magnetron tube unless while inside unit you see something obviously wrong 2 fuses are under $5.00

Magic Chef... | Answered on Sep 27, 2009

I would definitely contact the manufacturer since most of them have a one year parts & labor warranty and they'll fix it free.

If you have your owner's manual, you can find their number. If not, please reply back with your brand and model number (or brand at least) so we can help you.

Sounds like a bad door switch or relay, and also possibly a bad magnetron or high voltage diode.

Magic Chef... | Answered on May 09, 2009

Chances are its the fuse on the circuit board. You will have to remove the outer shell of the unit to access it.


Magic Chef... | Answered on Feb 27, 2009

Hi, I am not sure of the cost concerning the control board, however, it does sound like a control board problem, or a door switch problem, I would need to see the specific unit diagram to know for sure, but many microwaves, not all, but many, have a door switch related to that part of the circuit, usually the fuse would blow at that point, but there again, it depends on the circuit. I would suggest you get the unit checked soon however. Hope that helps somewhat, and thank you.

Magic Chef... | Answered on Jan 24, 2009

So it's running even with the door open? If not, please reply back with more details. If so, here's my initial answer:

This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

If you someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

We're happy to help and we appreciate your thoughtful rating of our answer.

Magic Chef... | Answered on Jan 24, 2009

This is due to spills, accumulated moisture from steam / condensation, or both.

It can also be worse if your internal cooling fan is not running, or if the vents or filters are blocked or clogged.

Since the the cavity metal of the oven is chipped or charred, it will have to be sanded smooth and clean and then dried thoroughly.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.

Let it dry overnight with the microwave door open.

Once that's done, you should occasionally look for accumulated moisture on the floor of the oven and keep it dry.

The model number tag should tell you where it was made.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Magic Chef... | Answered on Jan 09, 2009

Visit Magic Chef online and click the Cusomter Service link at the top: http://www.magicchef.com

Magic Chef... | Answered on Jun 22, 2008


Magic Chef... | Answered on Feb 20, 2019

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