Question about Sharp R-7A95 Microwave Oven

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Sharp R-A95 no power

Used my Sharp to heat water yesterday and today there is no power. I have checked the wall plug with a hair dryer and it is ok. Is there an internal fuse, if so, where is it located? Need Help

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  • 8,820 Answers

On these models, the fuse is usually located either between the door switches or on the floor of the chassis.

A microwave can be dead for many reasons.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.

If it has a hood thermostat, that should read open, as opposed to the others, which should read closed.

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

You can possibly still find an exploded view by entering your FULL model number (with and without dash) here: http://www.searspartsdirect.com

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

Posted on Apr 27, 2008

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Microwave clock and panel was lit in am wasn't used but in evening when went to use it isn't lit and won't work at all


Hello Anonymous

At the risk of starting with the very basics, when you say that the clock and panel aren't lit and wont' work at all, the first place to look is the wall power. You may be missing power from the wall because:
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  2. Make sure the outlet has power. Take some plug-in-able item and plug to the outlet and see if it can turn on. If not:
  1. A number of kitchen outlets may have GFI switches, especially if they are anywhere near sinks. The GFI may have been tripped. There should be a reset switch in the middle of the plug. See if it's tripped, and reset if necessary.
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GE microwaves with a digital display will show an error code when there is a problem or malfunction with the unit. One type of error code that will be displayed on a GE oven and require troubleshooting is a code F3. An F3 error code indicates that the keypad for the control panel is bad or has a short. This will cause the microwave to beep continuously after the set clock message appears.

Unplug the power cord for the microwave from the electrical outlet. Pull the microwave out from the wall and set it on a table or the counter.


Find and remove the two screws from the top of the grille, on the font of the unit, with the Phillips-head screwdriver. Pull the grille off of the microwave.


Find and remove the screws that are used to secure the control panel to the microwave frame. Lift the control panel unit up and away from the microwave.


Find and remove the screw that is used to secure the green ground wire. Pull out all of the connectors and ribbon cables from the control board.


Apply heat from a hair dryer to the front of the control board for at least 30 seconds. Make sure the hair dryer is at the low setting. Pull up on one corner of the top membrane, then peel it off of the control board.


Repeat Step 5 for the other membrane that is on the control board.


Insert the pliable circuit of the new membrane through the opening in the control board. Remove the wax backing to expose the adhesive for the membrane. Place the membrane onto the control board.


Peel the wax backing off of the top membrane, then place it on the control board.


Place the control board back on the microwave and secure it with the screwdriver. Reattach the grille, and set the microwave back in place.


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Ge profile microwave f3 error and beep


F3 error code indicates that the keypad for the control panel is bad or has a short. This will cause the microwave to beep continuously after the set clock message appears.
1 Unplug the power cord for the microwave from the electrical outlet. Pull the microwave out from the wall and set it on a table or the counter.
2 Find and remove the two screws from the top of the grille, on the font of the unit, with the Phillips-head screwdriver. Pull the grille off of the microwave.
3 Find and remove the screws that are used to secure the control panel to the microwave frame. Lift the control panel unit up and away from the microwave.
4 Find and remove the screw that is used to secure the green ground wire. Pull out all of the connectors and ribbon cables from the control board.
5 Apply heat from a hair dryer to the front of the control board for at least 30 seconds. Make sure the hair dryer is at the low setting. Pull up on one corner of the top membrane, then peel it off of the control board.
6 Repeat Step 5 for the other membrane that is on the control board.
7 Insert the pliable circuit of the new membrane through the opening in the control board. Remove the wax backing to expose the adhesive for the membrane. Place the membrane onto the control board.
8 Peel the wax backing off of the top membrane, then place it on the control board.
9 Place the control board back on the microwave and secure it with the screwdriver. Reattach the grille, and set the microwave back in place.
10 Plug the microwave back into the power outlet and reset the clock.

Hope this helps.

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Hi,
Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips
http://www.fixya.com/support/r5508031-microwave_oven_basic_troubleshooting

heatman101

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Since it's less than one year old, it should be fully covered under warranty.

I'd suggest contacting the manufacturer to get it fixed free.

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

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