Technology0 min ago
New Microwave Oven, Red Hot???
24 Answers
I've taken delivery of a Sharp R272KM Solo 20L 800W Microwave Oven. I used it to heat something for 4.5 minutes and the outside roof and sides were red hot. This didn't used to happen with my previous Sharp oven.
Any idea what, if anything, could be wrong? Cheers.
Any idea what, if anything, could be wrong? Cheers.
Answers
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It might be that it gets hot.
no - actually it shouldnt
it is protected by the wire mesh ( Faraday cage) and if it is heating it means the cage is at fault
and I wdnt have a leaking microwaves in the house actually
even if the skool-leeva at the end of the faults line phone says
" yeah foo it OK - ah fink" I wd return it
no - actually it shouldnt
it is protected by the wire mesh ( Faraday cage) and if it is heating it means the cage is at fault
and I wdnt have a leaking microwaves in the house actually
even if the skool-leeva at the end of the faults line phone says
" yeah foo it OK - ah fink" I wd return it
//It might be that it gets hot.
no - actually it shouldnt
it is protected by the wire mesh ( Faraday cage) and if it is heating it means the cage is at fault
and I wdnt have a leaking microwaves in the house actually//sic
Don't pay any heed to that bunkum Lady. Microwaves cannot pass through metal. They will pass through glass and that is why the door (Glass) has the dot matrix metal shield built in. You can see in but the microwaves cannot get out. I would think that the case got hot purely due to conductance of heat from whatever you were heating. 4.5 minutes is a fair old amount of power at 800 watts. WE have a Sharps microwave (950W) which is a replacement for a previous Sharps, they are a reliable machine. However like all things modern they do suffer from the drive to reduce costs and like any other brand you care to mention the build quality and attention to detail has been eroded. The gauge of metal used is not as heavy or rigid as it once was and any surplus insulation (inside the casing) has been reduced to a minimum. The manufacturers also in their wisdom saved money long ago by reducing the thermal heat conductance barriers that were part of the chassis build. I think that you will find that the machine is operating as it should. You can do a sneaky check to test if the oven is safe. UNPLUG it. Now place a mobile phone inside and oven cavity and call the number from your land line or another mobile. If the phone cannot be called the oven is definitely safe. However some of the very modern mobiles that are using 4 and 5g may get a signal and this does not mean that the oven is unsafe, just that the frequency of the phone signal is outside the microwave bandwidth and therefore not blocked.
no - actually it shouldnt
it is protected by the wire mesh ( Faraday cage) and if it is heating it means the cage is at fault
and I wdnt have a leaking microwaves in the house actually//sic
Don't pay any heed to that bunkum Lady. Microwaves cannot pass through metal. They will pass through glass and that is why the door (Glass) has the dot matrix metal shield built in. You can see in but the microwaves cannot get out. I would think that the case got hot purely due to conductance of heat from whatever you were heating. 4.5 minutes is a fair old amount of power at 800 watts. WE have a Sharps microwave (950W) which is a replacement for a previous Sharps, they are a reliable machine. However like all things modern they do suffer from the drive to reduce costs and like any other brand you care to mention the build quality and attention to detail has been eroded. The gauge of metal used is not as heavy or rigid as it once was and any surplus insulation (inside the casing) has been reduced to a minimum. The manufacturers also in their wisdom saved money long ago by reducing the thermal heat conductance barriers that were part of the chassis build. I think that you will find that the machine is operating as it should. You can do a sneaky check to test if the oven is safe. UNPLUG it. Now place a mobile phone inside and oven cavity and call the number from your land line or another mobile. If the phone cannot be called the oven is definitely safe. However some of the very modern mobiles that are using 4 and 5g may get a signal and this does not mean that the oven is unsafe, just that the frequency of the phone signal is outside the microwave bandwidth and therefore not blocked.
That would do it Lady. Looking at the user manual there is a row of vents on the bottom along the back edge. The manual also recommends a gap of 20cm (which is about 8 inches) from any adjacent wall and a 30cm gap from the top to say a wall cabinet. Must say that seems to be quite a lot of space but those vents are what help to keep the machine cool as is heats up the contents. A fan blows and vents the cavity of heat and steam to prevent overheating. It does however not prevent overeating. (^_*)
LB - sorry to digress.
Has anybody ever noticed whether on Soaps, reality TV, including my own relatives homes. There are piles of papers, salt, pepper and loads more sitting on the little grid on top of microwave. That alone would blow the bloody thing up.
Back to you LB - I don't think for one minute your moving the microwave away from plugs should cool it down. If it is brand new - send back for another new one. The shop should be able to give another one even tho you don't have the box.
Has anybody ever noticed whether on Soaps, reality TV, including my own relatives homes. There are piles of papers, salt, pepper and loads more sitting on the little grid on top of microwave. That alone would blow the bloody thing up.
Back to you LB - I don't think for one minute your moving the microwave away from plugs should cool it down. If it is brand new - send back for another new one. The shop should be able to give another one even tho you don't have the box.
Because microwaves will not pass through metal, the cavity and case itself act like a Faraday shield. They are not a cage which is normally made of a mesh or grid with the mesh size being dependant on the frequency to be blocked. Because of the requirement to have visual contact with the inside during cooking the door has a glass panel. As I explained this does need additional measures to block the waves, hence the built in laminate of a dot matrix screen that makes safe the sixth surface.
"" There is a common misconception that a microwave oven is a Faraday cage. It is not. Not even a close approximation. Look at the mating surfaces between the door and oven. There is no bare conductive metal at all, usually power coated sheet metal or plastic on both surfaces. It is essentially *wide open* from an RF perspective except right at 2.4GHz. Attenuation at 2.4GHz is achieved through the use of metal features inside the door that make the slot between the door and the oven look like a quarter wave reactive choke. 2.4GHz is essentially reflected back into the oven from the door/oven seam. This is why the door is so thick.""
The door itself acts as a choke and attenuates the microwave beams the cavity size and wave guide from the magnetron being carefully calculated to achieve this . Microwaves will not pass through metal and metal does not need "Faraday cage"protection.
physicsforums.com/threads/microwave-faraday
"" There is a common misconception that a microwave oven is a Faraday cage. It is not. Not even a close approximation. Look at the mating surfaces between the door and oven. There is no bare conductive metal at all, usually power coated sheet metal or plastic on both surfaces. It is essentially *wide open* from an RF perspective except right at 2.4GHz. Attenuation at 2.4GHz is achieved through the use of metal features inside the door that make the slot between the door and the oven look like a quarter wave reactive choke. 2.4GHz is essentially reflected back into the oven from the door/oven seam. This is why the door is so thick.""
The door itself acts as a choke and attenuates the microwave beams the cavity size and wave guide from the magnetron being carefully calculated to achieve this . Microwaves will not pass through metal and metal does not need "Faraday cage"protection.
physicsforums.com/threads/microwave-faraday
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