Question about Sharp R-820B Convection/Microwave Oven

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As soon as I touched a key on the keypad the whole thing went black and nothing works. I assume it is the control panel. Is there a fuse in there I can check?

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If it blew as soon as you hit Start or another pad which would make it start, then I would suspect you have a shorted high voltage capacitor.

In some cases a loose fuse holder will cause the fuse to melt open after so long.

With the microwave unplugged, if you can easily turn the fuse with your thumb & forefinger while it's in the holder, it has overheated and fatigued and the holder should be replaced.


Simply squeezing the holder's terminals together with pliers is not really a good or long-term solution. Metal fatigue is fatal.

When a connection is loose, heat results, which eventually melts the fuse internally.

This is usually evidenced by a very tiny ball of solder at the point where the end cap meets the body of the fuse.

You can use a generic holder - it's a lot cheaper than ordering one. The connectors should be 1/4" tabs and it should be rated at 20 amps or better.

You should be able to get one from a home center or local appliance parts store.

Assuming you have a model R-820B, We have the service / repair manual for this model and have uploaded it to our site here to help you.

It will give you safety info, step by step help in disassembly, troubleshooting tips, and part numbers.

Most computers will open this document automatically, but you may need the free Adobe Reader.

You can order parts from Encompass here or you can call them toll-free at 866-779-5835.

Bulbs and 20A ceramic fuses can be had locally in most grocery stores, hardware stores, home improvement centers, and big box or department stores.

Reply back if you have a different model number or need more help.

Otherwise...

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

Posted on Jun 30, 2009

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1 Answer

Panasonic microwave nn a554w


First check is the main fuse of the unit. On countertop units, you will need to take the shell off. The fuse will be close to where the cord comes through into the unit. OTR units, this main fuse is usually behind the control panel or possibly behind the vent. Usually the fuse is obvious if blown, otherwise test with an OHM meter, if open, replace fuse.
Some brands will also have a thermal cut-off fuse in the incoming voltage line to the control board. Older Maytags and Samsungs have this fuse in it. This thermostat looking fuse is usually above the oven cavity somewhere under the outside shell. Sometimes you can get to it through the vent of OTR models. Test with an OHM meter, replace if open.
If you have a stuck key or non-responsive key, most of the time you will have to replace the keypad for this microwave oven repair. If your keypad is connected to your control board by a flat ribbon wire, try disconnecting it and clean the silver contacts with an ordinary pencil eraser. After cleaning, plug it back in and try it. If it doesn't fix it, replace the keypad unit. Some units actually have keypad tests to confirm your diagnosis of a bad key.
If your keypad and control is the same unit, replace that unit. Another note, unlike stove/oven keypads and controls, most microwaves do not have error codes or tests to distinguish whether it is truely the keypad or control. Most of the time, it is the keypad that needs replacing, but a small percentage of the time it can be the control. Check the tech sheet if they can point you to the right part.
Rewmember use the DVOM
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The unit has a fuse in the power board, but when the fuse is gone it does not even start up. If it starts it is not the fuse.

Look rather a problem with a faulty touchpad, or the magnetron that is not working and need to be changed.

Check also the door sensor.

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My Panasonic NN-S533 1300 Watts,don't work.


HI,

Just visit this link HERE and your whole problem will be solved.
Refer the points 6.17,6.20,6.21,

Goodluck,
Please don't forget to rate the solution

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Key pad flashing se . key pad locked pease tell me what to do iam a disabled lady need help please


"SE" error means you have a shorted membrane keypad.

You would need to have either the membrane keypad itself replaced, or the control panel frame assembly which comes with a new keypad, or the whole controller.

Part numbers and prices will of course depend on the model number.

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GE microwave oven not working


see this causes and fix it. God bless you
No Lights or Power, Unit seems Dead First check is the main fuse of the unit. On countertop units, you will need to take the shell off. The fuse will be close to where the cord comes through into the unit. OTR units, this main fuse is usually behind the control panel or possibly behind the vent. Usually the fuse is obvious if blown, otherwise test with an OHM meter, if open, replace fuse.
Some brands will also have a thermal cut-off fuse in the incoming voltage line to the control board. Older Maytags and Samsungs have this fuse in it. This thermostat looking fuse is usually above the oven cavity somewhere under the outside shell. Sometimes you can get to it through the vent of OTR models. Test with an OHM meter, replace if open.

Touchpad dead If you have a stuck key or non-responsive key, most of the time you will have to replace the keypad for this microwave oven repair. If your keypad is connected to your control board by a flat ribbon wire, try disconnecting it and clean the silver contacts with an ordinary pencil eraser. After cleaning, plug it back in and try it. If it doesn't fix it, replace the keypad unit. Some units actually have keypad tests to confirm your diagnosis of a bad key.
If your keypad and control is the same unit, replace that unit. Another note, unlike stove/oven keypads and controls, most microwaves do not have error codes or tests to distinguish whether it is truely the keypad or control. Most of the time, it is the keypad that needs replacing, but a small percentage of the time it can be the control. Check the tech sheet if they can point you to the right part.
10_11_2012_10_49_56_am.gif10_11_2012_10_50_31_am.jpg

Oct 10, 2012 | GE SpaceMaker Microwave Ovens

1 Answer

My Maytag Microwave is blowing the 250v- 20a fuse behind the key panel on the black wire. It melted the fuse holder mounted to the main body of the unit. Any thoughts on why?


The magnetron is shorted, the keypad control board is bad, blowing fuses. If less than 7 years old it has a inverter board that can be trouble, But with the level of work and parts it will easily exceed the cost of a new microwave oven.

Apr 07, 2012 | Magic Chef CMV1100 Microwave Oven

1 Answer

I have samsung microwave model number ME 1240SC. my front panel touch screen is not working properly, when i press the keys it is not working. so i think i need to replace the touch screen. so please...


That model does not user a touch screen, it actually uses a standard membrane keypad.

The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes. Then try it again.

If it's still not responding, I would suspect your membrane keypad has failed.

Is it possible that some spray cleaner accidentally got into the controls?

Direct spraying of cleaners on the keypad and steam from the cooktop can damage the controls.

I always recommend that you spray non-ammonia cleaner on a soft cloth (not a paper towel which can scratch) and gently wipe the keypad.

And I always recommend that you use the vent fan whenever you're cooking on the stove top to keep heat, steam, and grease out of the controls and door panels.

If it does not dry out over time, it may need to be manually dried or blown out.

The keypad may be damaged or worn out, or control unit may be damaged.

If you (or someone you know) might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved.

If you wanted to order a new membrane switch / keypad, the part number is DE34-00145F and you can order it from the Pros here. They're our favorite supplier.

Otherwise, this is a pretty standard 1200W microwave, and you may find it better to simply replace it instead of repairing it.

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

Dec 03, 2010 | Samsung Microwave Ovens

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The touch pad on the microwave lights up, but will not respond when any of the keys are touched.


The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes.

If it still will not accept key input, your membrane keypad has failed.

Depending on your specific model number, the membrane keypad may be available separately, or you may have to order the control panel frame, which comes with a new keypad.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Let me know if I can help further.

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

Aug 20, 2010 | GE Profile Spacemaker Over-the-Range...

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Microwave Oven


I report from owner manual.

F3 means : Short circuit on key panel (your touch pad).
You get F3 error if a shorted key panel is detected for more than 60 seconds.
Solution: . Replace key panel (touch pad).

Try first unpluggign power cord for five minutes.

If you think that the problem may had been caused by water inside the keypad you can try using an hairdryer on the keypad, taking care not to melt the keypad plastic.
If that does not work, then replace the keypad.

You can buy replacements here. or Order GE Microwave Ovens Parts Here

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On a GE microwave F3 means you have a failed keypad.

We replace these for customers nationwide with our guaranteed $39.95 service.

If you might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved. It's here.

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
prototech@usa.net
http://www.microwavedisplay.com

May 29, 2006 | GE JVM1861SF Microwave Oven

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