Question about Microwave Ovens
At power on the display mostly shows 88:88 and occasionaly flickers off and on. When the door is open, the internal light is at half brightness and the turntable begins to rotate. Occasionally the light will flicker to full brightness. I suspect a logic power supply problem - can anyone confirm what's going on?
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Posted on Jan 02, 2017
It's probably a defective door switch, probably the upper one, or the mount which holds the switch is broken. Opening the door while cooking (without first hitting the STOP button) is the primary cause of door switch failure. There are plastic mounts inside the microwave which hold the door switches and onto which the door hooks latch when you close the door. The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly. Usually it's not a loose screw, but instead a broken tab on the switch holder, allowing the switch to rotate just out of position.
Posted on Sep 23, 2006
Found this Panasonic post in the Samsung section!
If it moves just a tiny bit when the door opens and then stops, that's normal.
If it keeps running when the door is open, that's usually due to a bad door switch or broken / loose door switch mount.
If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
Any Panasonic parts not available locally can be had here: http://www.pasc.panasonic.com/epartr
We appreciate your thoughtful rating of our answer.
Posted on Nov 17, 2007
This is usually caused by either a bad door switch, a loose door switch mount.
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
You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
Please feel free to contact me directly if you need more help.
We're happy to help and we appreciate your thoughtful rating of our answer.
William E. Miller, AS-EET
Posted on Apr 18, 2008
very possible your magnatron is faulty. Disconnect 2 transformer wires and make sure they dont short. try the program again. if no noise, replace magnatron:capacitor and HV diode Please i strongly suggest an electrician help you as it is truely dangerous in there. .
Posted on Sep 17, 2009
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Even though your door switches appear to be fine, one of them is bad, most likely the top switch, so you need to check it.
Also try resting different resistors and capacitors on the circuit board and try to find out a square box near the transformer. There could be one pin that did not appear to be soldered correctly. If so cleaned the pin and resoldered the pin.
It may be needed for you to perform an RF leakage test. Most amateurs and even many professionals do not own an RF leakage meter. You can get one at appliance and electronic parts suppliers, costing from about $10.00 up to many hundreds of dollars for the certified models used at the professional level. You can find inexpensive RF detection devices at many retail stores such as Wal-Mart and Radio Shack.
If your microwave does not work at all and you know everything is plugged in properly and the outlet is functioning, then check your fuses and your door switch. If the internal fuse or thermal fuse is blown you will need a professional to help you replace it. You should also check the door hooks and the door release button. If they are broken, your microwave will not work.
If your microwave looks and sounds normal but isn't producing any heat, you should check the internal door switches, the high voltage circuitry and the circuit board for problems. You will need a certified technician to help you make these repairs.
If you are unable to adjust the power level, there may be a defective triac or a problem with the circuit board. If the carousel inside your microwave won't turn when you run it, the small motor that operates it may be broken.
If the display flickers but it does not affect how the microwave heats, then you don't need to worry about it. But if you are having display flickering and it is affecting the way your microwave operates, you may have a more serious problem in the microwave cabinet.
If your microwave buzzes loudly and produces no heat you probably have a defective power diode, magnetron or high voltage capacitor. These are all things that can be replaced or repaired by a qualified technician.
Hope this will help you. Good Luck.
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