Question about Sharp R-820B Convection/Microwave Oven

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No power not even a clock i hve checked outlets

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Well, there is a fuse in these units which sounds like your problem in this instance. You can get to it by removing the outer panel on the microwave. To do this, look for all screws/bolts on the back/bottom of the microwave and remove them. This will let you remove the outer panel and give you access to the internals. Make sure you unplug the microwave first before opening it and don't touch internal components for at least an hour after unplugging it to stay safe. The fuse can be replaced at a hardware or electronics store. Let me know if you need any more help with this.
Benjamin

Posted on Nov 04, 2010

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LG ldg3016st has no power on main control panel


Did you have any power surges in the house? Any thunder storms?? even if you are not using a microwave, but it is plugged in , you see the clock?? That means it is getting power and running the clock so while you may not be cooking in it, it is actually using power to run the clock functions. So, if there was a power surge, it damages a part on the main board called the Low voltage transformer. It takes the 120 volts from the wall and drops it down to the voltages the board needs to operate, sometimes 5,12 24 or maybe 30 volts. If the primnary winding gets damaged from a surge of some sort. it will no longer light up if that small transformer was damaged. That can happen without even blowing the fuse as the small wires in the transformer were never meant to carry the 15 or 20 amps the fuse is rated at. So the transformer goes bad and the unit is dead but no blown fuse. Have to check the primary winding of the low volt transformer to see if it has continuity. If not, will need new main circuit board. Sorry But $$$$$

Sep 16, 2017 | LG Microwave Ovens

1 Answer

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:
  1. The microwave isn't plugged in. Someone may have yanked a plug to plug in a mixer, phone charger, thanksgiving animated ornament, or what have you. Trace the cord back and make sure it's plugged in.
  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.
  2. The breaker may have been tripped. Most kitchen circuits are wired to 20Amp breakers. If this is elsewhere in the house, like in an entertainment room or such, it is likely a 15 Amp outlet. Microwaves can draw a fair amount of power. Someone using another kitchen appliance, hair dryer, or what have you, on the same circuit, may have tripped the breaker. Newer code may specify an AFI or GFI breaker for kitchen outlets. In that case, a fault with something else on the circuit may have tripped the breaker. If that is the case, and it trips again, talk to an electrician. You don't want a fault like that undiagnosed.

    3) You may also want to try plugging the microwave into another outlet, even if the normal outlet seems OK

    If there's wall power and a good plug-in, then you work back to the microwave itself. A number will have fuses. Also, there may be interlocks that kick in if, for instance, the carousel rotation is impeded - that can mean something on the carousel is hitting a wall, which can risk tipping something over and spilling, or risk mucking up the reduction gears for the carousel axle if it keeps pushing.

    At that point, looking for specifics on your microwave model will be needed. You may also try the Microsoft Support approach - i.e unplug it for 5 minutes, then plug it back in and see if it works.

    Hoping this helps, Good Luck!

Nov 18, 2015 | In Microwave Ovens

1 Answer

How do I set Clock?


Disconnect the microwave from the power source while the power is still out. If the microwave is a built-in, turn off the circuit breaker. Otherwise, unplug the microwave from the wall outlet. This prevents a power surge from damaging the magnetron tube when the power is restored.Turn on the circuit breaker or plug the microwave into the outlet only when you are sure that the power is permanently restored. If there are still storms in the area, the power may be disrupted again. Reset the clock on the microwave. Microwaves vary slightly on how to set the clock, but usually there is a clock button you press. Use the number pad to input the correct time and press the clock button again to set it. Test the microwave by heating some water to ensure that it is still in good operating condition.

Jun 20, 2012 | Emerson Fans MW8995B Microwave Oven

1 Answer

Microwave stops randomly on its own, dispaly flickers and I get prompted to enter clock settings, what should I do to fix it


When a microwave asks for the clock settings, it has lost power. Check the plug and the outlet for damage or if it is loose. When on, vibrations can cause the plug to reposition if loose enough. Even a very short loss of power will reset the microwave. If the plug/outlet is ok, then check to make sure that the fuse for the outlet is tightened fully (breaker switches do not have this problem). Last, try another outlet as the wiring to the outlet may be loose.

Feb 11, 2012 | Danby DMW773 Microwave Oven

1 Answer

Machine will not turn on


from online Microwave Repair Manual: Totally dead oven (no lights, no clock, no display, no fan, no heat...)First, check power to the outlet using a lamp or radio you know works. The fuse or circuit breaker at your service panel may have blown/tripped due to an overload or fault in the microwave oven or some other appliance. You may just have too many appliances plugged into this circuit - microwave ovens are high current appliances and should be on a dedicated circuit if possible. If you attempt to run a heating appliance like a toaster or fryer at the same time, you *will* blow the fuse or trip the circuit breaker. A refrigerator should never be plugged into the same circuit for this reason as well - you really don't want it to be without power because of your popcorn!

If you find the fuse blown or circuit breaker tripped, unplug everything from the circuit to which the microwave is connected (keep in mind that other outlets may be fed from the same circuit). Replace the fuse or reset the circuit breaker. If the same thing happens again, you have a problem with the outlet or other wiring on the same branch circuit. If plugging in the microwave causes the fuse to blow or circuit breaker to trip immediately, there is a short circuit in the power cord or elsewhere.

The microwave oven may be powered from a GFCI outlet or downstream of one and the GFCI may have tripped. (Removing a broken oven lamp has been known to happen.) The GFCI outlet may not be in an obvious location but first check the countertop outlets. The tripped GFCI could be in the garage or almost anywhere else! Pushing the RESET button may be all that's needed.

Next, try to set the clock. With some ovens the screen will be totally blank following a power outage - there may be nothing wrong with it. Furthermore, some ovens will not allow you perform any cooking related actions until the clock is set to a valid time.

Assuming these are not your problems, a fuse has probably blown although a dead controller is a possibility.


While you can do some repairs on your microwave, what you don't know can kill you... even on an unplugged microwave, so make sure you understand the dangers and how to reduce them before you try anything inside a microwave. If you want to do more yourself, go to the link at the top of this post.

Oct 21, 2010 | Microwave Ovens

1 Answer

I accidently ran it for a few minutes wih nothing in it. I turned it off and everyting seemed fine. Later I walked in kitchen and there is no light, power or anything.


I assume you checked the power cord and house power circuit breaker panel... possibly tripped unrelated to your running the microwave empty.

(the following is from http://www.kellerstudio.de/repairfaq/sam/micfaq.htm#mictotdo)


The microwave oven may be powered from a GFCI outlet or downstream of one and the GFCI may have tripped. (Removing a broken oven lamp has been known to happen.) The GFCI outlet may not be in an obvious location but first check the countertop outlets. The tripped GFCI could be in the garage or almost anywhere else! Pushing the RESET button may be all that's needed.

Next, try to set the clock. With some ovens the screen will be totally blank following a power outage - there may be nothing wrong with it. Furthermore, some ovens will not allow you perform any cooking related actions until the clock is set to a valid time.

If those are not the problems, then the main fuse is the most likely suspect for a totally dead microwave.
Remember, while you can do some repairs on you microwave, what you don't know can kill you... even on an unplugged microwave, so make sure you understand the dangers and how to reduce them before you try anything inside a microwave. If you want to do more yourself, let me know and I will point you in the direction of some good resources.

Oct 21, 2010 | GE Microwave Ovens

1 Answer

Spacesaver powers off 2 seconds after resetting clock and time...


The clue is that you have to reset the clock. You are losing power somehow. the Main Board thinks it is being unplugged and it resets the clock and you have to start all over. The fact that after so many times it will finally work tells me that whatever bad connection you have is finally getting hot enough to expand and make a good enough connection to keep working. Intermittant connections are the worse to find. A lot of trial and error to find the problem. can be bad fuse and fuse holder ( in the unit), bad outlet, loose wire at circuit breaker, loose wire at outlet. Even a loose breaker where it snaps onto the buss bar in the Breaker Box. Etc, it an really drive you nuts trying to find it. Try the unit in a totally different area making sure it is on a compleately different circuit breaker and see what it does, if the problem follows the unit, the problems is in the unit. If not, electrical problems, outlet, breaker, panel,

Aug 18, 2017 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Problem with electrical source


Does your manuel also tell you to use a DEDICATED 20amp circuit to plug your Microwave in to? More that likely you used a 15 amp circuit that other appliances were also plugged into. A refrigerator or other cooling item needs its own 15 amp circuit but can tolerate small amp draw items like a clock. The new, higher wattage microwaves need a 20 amp circuit for itself. Have your line checked , have your microwave fixed. Start new

Aug 26, 2008 | Microwave Ovens

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