Question about Sharp R-1490 Microwave Oven

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Out of power. I checked power line but it's okay, I think oven himself no power.

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Either the fuse is blown or the power supply is fried out. You can use a voltmeter to check

Posted on Dec 31, 2010

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Samsung smh8165w need # of ic102 please

IC chip 102 is a TNY276PN Off-Line Switcher Chip. I believe Power Integrations, Inc makes them. Make sure your power supply Zener diode ZNR101, along with your bridge diodes D101 through D104, (and, for good measure) D105 are all okay just to make sure they didn't short out and blow IC102.

Good luck!

Nov 30, 2014 | Samsung Microwave Ovens

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Microwave will not run a cook cycle. Touchpad functions until door is opened or start button is pressed. When door is opened display goes dark. When door shuts display lights all characters and then says...

BEFORE DOING ANYTHING DISCONNECT OVEN FROM POWER. I do NOT recommend doing repair by yourself, if you NOT are really very familiar with electric repair, or have at least basic training in electric device repair and maintenance.
"When door is opened display goes dark. When door shuts display lights all characters and then says "touch clock"."
Obviously, by opening door, oven gets disconnected form power line.
This is mostly caused by loose connections on wiring socket, and can be anywhere inside. Check security micro switch on door latch. This switch normally disables only running the oven when door is open, for security reasons. In your case, it seems that opening door disconnects oven from input power. Sometimes the switch is loose, or wires are not firmly pushed in the socket. If the power line wiring is loose, and by opening door looses contact with socket, it can touch metal housing inside, cause short, electric shock, serious even mortal injury and fire. This is dangerous high voltage switch, and to access it one must open oven from the back and take off the cover. I do not recommend doing it by your self.
Rem: Replacement micro switch is couple dollars.

Oct 24, 2014 | Microwave Ovens

1 Answer

Where is the fuse located

If you can take off the cover of the microwave and find where the power cord goes into the back of the unit you will see where the three wires from your power cord branch out, black, white, and green. Look to see where the black wire goes and it will usually terminate at a small circuit board and the fuse will usually be mounted on that board. Sometimes that black wire will have an
in-line fuse on it before it goes anywhere else. Hope this helps.

Jul 24, 2014 | Samsung Microwave Ovens

1 Answer

JVM1750sm1ss micro-oven, totally dead when plugged in.

see the diagram and proceed with common sense use the VOM
God bless you

Jul 16, 2012 | Microwave Ovens

1 Answer

Mic.oven takes longer to heat food

The microwave may not be cooking at full power, check the settings. If okay the magnetron is on it's way out and will eventually fail.

Jun 11, 2012 | Emerson MW8168B Microwave Oven

1 Answer

Whirlpool Microwave MH6700xW-0 Blows internal fuses regulary

Assuming your power line voltage is okay, it would not surprise me that after 27 years, your high voltage capacitor is drying out and increasing its capacitance. This will cause variance in the high voltage output, which can stress the magnetron and increase current consumption.

You can order Whirlpool parts my model number here.

For more free DIY and other help & advice, feel free to contact me via my site.

William E. Miller, AS-EET
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

Mar 16, 2017 | Whirlpool Microwave Ovens

1 Answer

No Power for

The fuse would need to be pulled and checked with a digital meter using the ohms setting.

Mar 28, 2012 | Maytag Microwave Ovens

1 Answer

Can you tell me what code F4 means? model

Code F4 means you need to repair the line to or replace the oven temperature sensor. The line typically runs from the display to the back of the oven, you'll have to trace it yourself. The oven sensor should be mounted to the back of the oven lining (Obviously on the inside) by two screws. Disconnect the power from the unit and unmount the sensor to check it, you should have around 1080 ohms of resistance but first you'll have to get that annoying plastic housing of wires through the mount hole and disconnect it so you don't lose it inside the oven. If you don't see screws from the inside of your oven than you'll have to remove the back panel to access them, but this may be a good thing as you don't have to worry about fiddling the plastic connector piece into the oven. You're measuring the resistance from one lead to the other inside that plastic housing, again at around 1080 ohms in a 70 degree environment. If you're way off, or 5 - 6 ohms off, you'll need to replace the sensor. If the error occurs while cooking you can also run the oven hot, turn off and disconnect the power and take your measurements again. If they read the same your wiring harness should be okay and replace the sensor.

Oh and btw, you'll most likely have to splice the wires to adapt to your new sensor they're never the same.. not in my experience lately anyway.

Apr 25, 2010 | Amana MVH230 Microwave Oven

1 Answer

Magic Chef Over the Range, MicroOven, model MCO153UBF

I tried the usual things, then checked the outlet in the cupboard where the unit is plugged in.....It was okay, but then I noticed a separate electrical cable going into the wall at the outlet. I went to the breaker box downstairs, found a breaker marked "Microwave Oven", flicked it off and on and away the microwave oven went....It is now okay. I guess the thermostat had turned everything off when it became too hot....
anyway all okay now....thx Janet

Jul 22, 2008 | Magic Chef CMV1000B Microwave Oven

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