Microwave Repairs

Microwave Oven Repairs in Faridabad | Service Centre

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Microwave Oven Repairs in Faridabad | Service Centre

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No matter in which condition your microwave is, we repair microwave of all types i.e Convection, Grill and Solo of all brands in any condition at your own place,

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We can repair all major microwave brands, even if you have purchase Abroad.

This microwave oven is a remarkable feat of Engineering.

The rapid heating that makes microwaves popular is made possible by power provided from this vacuum tube.

It’s likely in a radio like this inevitably tiny transistors, and microchips replace clunky vacuum tubes,

but it’s too soon to relegate them to the museum microchips can’t easily replace tubes for producing power.

Heating food now a microwave contains three main components.

A vacuum tube called a magnetron it generates the energy that heats food a waveguide hidden in the wall to direct that

energy to the food and a chamber to hold the food and safely contain the microwave radiation.

In principle, a microwave oven heats no differently than any other type of heat transfer at a molecular level.

Heat is a transfer of energy that results in increased motion of the molecules of the substance.

Since we aren’t quantum sized, we observe this increase in movement as a rise in temperature in a traditional oven or stove.

We heat food by placing a pan on a burner or in the oven where the walls radiate heat which cooks the outside of the food.

The insides cook wood heat transfers from the surface of the food to its interior in contrast energy from the magnetron penetrates into the food.

Which means the whole mass of food can be cooked simultaneously.

How does it do this?

Well, our food is filled with water which is positively charged at 1:00 in and negative at the other to give these molecules more energy.

We expose it to electromagnetic waves that emanate from the tube by definition the waves have the electrical and magnetic fields.

That change direction rapidly for this oven the direction of the areas change 2.45 billion times per second.

Water will try to align with the radiations electric field.

The changing field rocks the water molecules back and forth rapidly.

Molecular friction from this creates heat as the motion disrupts the hydrogen bonds between neighboring water molecules.

Now you can get an idea of the wavelength of the energy emitted from the magnetron using cheese.

If you can see carefully than you observe, where the cheese is completely melted in other sections.

Where it’s completely unheated, the ovens metal walls only reflect waves of a link that fits inside the oven.

This standing wave causes hot and cold spots inside the oven.

The three-dimensional pattern of ways it’s difficult to predict, but the principle can be seen by looking at the waves in a single dimension.

The peaks and valleys in the wave represent the most significant energy of the stream, while the nodes here correspond to the cold spots inside the chamber.

If you measure the distance between melted cheese spots,

you will find about two and a half inches that would be half the wavelength the distance between nodes and is pretty close

to the actual wavelength of microwave radiation used.

Using that wavelength, you can estimate the microwave radiations frequency the frequency is related to the wavelength by the speed of light.

I get an answer that only has a four or five percent error not unfortunate for this first measurement now the real engineering.

Microwave Oven service center in Faridabad

In the microwave oven lies in creating the magnetron that generates high-powered radio waves it’s honestly an amazing

and revolutionary device the vacuum tube is inside here these are cooling fins thin pieces of metal that dissipate the heat.

As the magnetron operates the essential parts are these two magnets and the vacuum tube.

Apply a large voltage across both the inner filament and the circular copper.

Microwave Oven Repairs in Faridabad

Outside this voltage boils electrons off the center filament and they fly toward the circular copper section.

The thread is made from tungsten and thorium tungsten because it can withstand high temperatures and thorium

because it’s a good source of electrons the magnets Bend.

These electrons that they swing back toward the center filament.

We adjust the magnetic strength so that the now orbiting electrons just rush past the opening of these cavities like

blowing over a half-filled pop bottle to make it whistle this creates an oscillating wave.

The microwave radiation that food it’s just astonishing that these cavities can be produced with high-precision low-cost

and incredibly high reliability.

Microwave Oven Troubleshooting in MINUTES ~ STEP BY STEP
okay in this Blog I’m going to show you in a step-by-step fashion how to
troubleshoot your faulty microwave oven  now before we start I’m going to go over
a few things that you will need to carry  out this troubleshooting procedure
you’re going to need a good digital  multimeter you can use analogs one as
well but I prefer a digital you’re also  going to need a couple of jumper wires
you can get these at RadioShack or any  other electronic supply store they’re
relatively inexpensive you’re also going  to need a Phillips and slot screwdriver
you’re also going to need a twenty K ohm  ceramic resistor like this it could be a
 watt a  watt or even higher if you  cannot find a  K ohm resistor at your
electronics supply store then you could  always look for a lower value all the
way down to a k with work but make sure  it has a sufficient wattage so try and
look for a ceramic one you can also look  in old electronics old television sets
and stereo equipment and they also look  like this  that’s a ceramic resistor so you could
look for one of these and you can just  pull it out of the old equipment and use
that a lot of microwave ovens use a  tamper proof Torx screw on the cabinet
to open it so have a tamper proof Torx  bit just like these is a hole in the
middle you can also get by with a tamper  proof hex key you can find this at your
local hardware store or Home Depot or  Lowe’s ok so let me go over a few of the
problems I fixed many of these over the  years probably at least  of them my
friends have brought me microwave ovens  I’ve repaired them for work so I’ll go
over a few things that are very common  one issue might be there’s no power to
the microwave at all and you did verify  that your receptacle has power by
plugging in another appliance or a lamp  just to make sure there is power
another problem could be that when you  turn on the microwave the light comes on
the turntable spins but you do not hear  the hum of the transformer for the
magnetron so that could be another issue  you could have another problem food
isn’t getting hot enough you can also  have a problem that when you go to push
start on the microwave oven that the  breaker trips so there’s a few different
problems I’m gonna go over each one now  the first thing you going to want to do
is make sure the microwave oven has been  unplugged then you’re going to want to
remove the cover on the microwave oven  generally a lot of microwave ovens will
have a screw here and there and the same  on the other side as well as on the back
where it’s bent over one there and along  the top there’s going to be one or two and the
same screw here on the opposite  side okay once the screws have been
removed from the cover gently grab the  sides and you’re going to slide it we
tilt it up a little outward like that  when you put it back you’re going to
slide the front edge in and tilt it down  okay the cover has been removed and on
one side of the microwave closest to the  control panel which is right here you’re
going to have all the components right  in front of you now before we touch
anything or do anything in the microwave  the first thing you’re going to want to
do is discharge this capacitor right  here it’s an oval capacitor it’s a ,
volt capacitor now even though there is  an internal resistor bleeding off the
voltage when powers removed  it’s still a very good idea to make sure
there is no voltage there because it  could be deadly now you’re going to take
the resistor clip one onto the  screwdriver make sure it’s on there good
the other end is going to go to the  ground screw on the chassis or any other
bare metal part that you can find  once that’s connected to the screwdriver
like so you’re going to reach down to  the capacitor right there and you’re
going to touch it to each term and I’ll  just hold it there for about  seconds
once you do that terminal you’re going  to reach into the other boot right damn
touching the other metal terminal and  hold it to that one remove the
screwdriver now just to make sure it is  fully discharged take the end of the
wire don’t touch the clamp push it  against the terminal reach into the
other boot hold it there  a few seconds and remove it now it’s
also a very good idea to take an  insulated pair of needlenose and once
you’ve done all this to go between the  two and wiggle that around if you get a
loud spark you didn’t do a good job so  there should be no spark between the
terminals this is now discharged now you  can safely work inside the unit now I’m
going to point out all the locations of  the components this is your cooling fan
you have your capacitor right here right  next to the capacitor is zoom in right
here this little black cylinder that’s  your diode high voltage diode we’ll be  testing that you have your high voltage
transformer right here this is the  magnetron that produces the microwaves
over here on the left side you have your
PC the PC board low voltage transformer  you have your circuit board
you have the  relay located on the circuit board on
the other side of this piece of metal  there’s going to be two or three  switches lined up that look like this
this is what the switches look like for  the door little button on each end
when  you push it in and out it makes the
connection between the two blades go on  and off and between these
two blades go  on and off now right over here this is
the light it shines through the screen  now on a lot of microwave ovens you’re  going to find that there is a little
board here where the power supply comes  in and on
that board will be a filter  like this and a ceramic fuse now that
fuses a  amps low blow fuse it’s  ceramic now if your microwave is not  working at all
you have no power display
or anything else you may just want to  swap that fuse out
because it may have  just gotten worn out over time so if you
change that fuse and you notice there’s  no problems for a little while
and  you’re good to go but generally when
that fuse blows is a problem now on this  unit you can see the fuse is in a holder
right here you would just pop the fuse
holder open and check the fuse right in  there now if the
microwave oven is  powered up and you have the digital
display going and you open the door and  light comes on but the microwave will  not turn on then you could have a
problem with one of your switches which  I pointed out earlier
which is this  right here what these switches do is
they tells the circuit board that the  door is fully closed and
if the door is  not fully closed the microwave will not
power on now the way to test the  switches is very simple
you’re going to  use a continuity setting on your digital
multimeter or a very low ohm resistance  setting the next step
you’re going to  look at the switch and you’re going to
see the wires connecting to the switch  you’re going to touch one probe of your  connector to one lead
and the other to that one like so and  then you push the button  and that verifies the switch is working
do it to all the switches you can find  is usually two or three now
some of them  when you connect it up like you see here
the alarm will already be on and when  you push the button in it will go off  that there’s two different types of
switches normally open and normally  closed now
you’re only going to test the  blades that have the wires attached to
it if you have a switch like this that  has three and only two wires are on the  switch
don’t bother checking the one that’s not  connected to anything now
many microwave  ovens have the power supply feeding
through one or two thermal cutoff  switches like that with that’s designed  to do is that this gets too hot inside
the microwave oven  this circuit opens up and these need to  be replaced the other way to test them
is the same way as the switch I just  showed you you’re going to put the  continuity tester across both of the
terminals like this lay one there and  this should have continuity when you  touch it that’s a good one
if you touch it and it doesn’t go on you  know you have one that blew you need to  replace that you
if the fuse is good the thermal cutoff  is good and all of
your door switches  are good you should have full power to
the microwave oven if you don’t the next  step is to make sure all of the blade
connectors attached to the switches and
the thermal cutoff like this make sure  they’re plugged in good and then
you’re  going to have to suspect that your low
voltage transformer on the circuit board  which is right here that
that is faulty  if this display does not come on you can
refer to my other Blog and shows you in  detail how to test this part right here  if you feel yours is faulty the link you
can click is right here now if you turn  on the microwave the light comes on the
turntable is turning but you do not hear
the hum coming out of the microwave oven  then it is a few things that can cause  the problem
now right on the back of the circuit  board is our UA which looks exactly
like  this once it’s removed this is what the
relay looks like you have three pins  that go into the circuit board
that are  soldered in you got two blades sticking
up this is what the relay looks like  when it’s removed and
I’ve seen many  times that when the microwave is running
with the light on and the turntable is  moving and you don’t hear
the  transformer humming that the contacts
inside the relay have arced and they no  longer make a good contact
so what  you’re going to do to check to make sure
this isn’t faulty is you’re going to  make sure everything is put back  together in microwave that you took
apart if you took anything apart you’re  going to put a cup of water in there and
you’re going to power the microwave up
with the cover off and then while the  microwave is running and
you don’t hear  the hum and nothing’s getting hot gently
take your screwdriver and just tap like  this keep tapping
the relay don’t bang  it too hard just keep tapping it now
when you’re tapping it like this if you  hear the hum come on
and the light dim  then you’re going to know the magnetron
right here is now active because you’re  getting power feeding into the  primary side of the high voltage
transformer and that would indicate you  have bad contacts in your relay you  would then have to desolder the relay
from the circuit board and install a new  one like this to -volt relay okay
so  once you’ve established that tapping on
the relay does not cause the transformer  to be powered up to turn
on the  magnetron you should hear a hum when
it’s running if you don’t hear a hum is  not running right then the
next step is  to disconnect the power and discharge
the capacitor once again once the  capacitor has been discharged
you’re  going to take your digital multimeter on
the high voltage AC setting connect up  on your alligator clips to one of the  probes reach in with the other end clamp
it onto the blade terminal of the  primary side which is the wires coming  from the board
you don’t want to touch
these wires that are red stay away from  these anything go into the capacitor
those are all high-voltage take the
other probe on the AC high voltage  setting and you’re going to take that  and connect that to the other side of
the transformer and now you’re going to  plug the microwave oven back in again
and don’t touch anything next you’re
going to want to put the cup of water in  the microwave and repeat the procedure
as before just like you’re going to cook
something and as soon as you push start  you’re going to want to look at this
right here  make sure you see  volts being fed
into the transformer if you see  and  you still don’t hear the hum then we can  move forward if you don’t see  then
that’s going to indicate that there’s  definitely an issue with the relay  mounted on the circuit board you want to
correct that before anything else more  than likely once you correct that
everything will work fine now if you do
see  volts at the blade terminals on
the primary side of the transformer which is the real heavy wires wound then
we can move to the next step so you see   volts on these terminals as the
microwave is running but you still do  not hear the hum  the next step is to turn off the
microwave oven and unplug it and  discharge the capacitor once again once
the capacitor has been discharged and the plug has been removed you can remove  this connector
from here like that you’re going to take a piece of masking
tape and you’re going to notice that the  diode is connected to one blade
which is  this wire and the other blade goes into a different spot on the transformer
just  make sure you tape together the diode  with the wire that’s on the same blade
now to release the top connector you  have to push down with a small pointed  tool like this in the blade connector
and pull and it will release once you  release the blade connector I want you  to refer to my other Blog it’s in the
link you see right here next to this  link you’ll see a number that is the  position in the Blog where you can jump
to to see just the testing for this  transformer if the transformer passes  the test all right so the next step now
would be to check out the magnetron is a  Phillips screw holding
one-sided unscrew  that okay so you remove the screw
holding in the magnetron it might be a  little bit of a clip so just rotate it a  bit and pull it out now once you take
out the magnetron inspect the magnets  these donut magnets right here make sure
they’re not correct check all the way
around shake it make sure there’s no  rattling check the end make sure  nothing’s cracked so that looks good now
the way to test this go to your low  setting on your meter in this case mine  goes down to  connect one probe to
one terminal  the other to the other terminal and you  should have a very very low reading like
you see here you don’t want to dead  short you don’t want to see three zeros  but you want to see anywhere from point
one to point three in that range that’s  a good one  the next test of the magnetron is to
raise your setting to the highest that  you have for resistance I’ll put mine to  a twenty Meg I have , Meg’s but put
it to  and what you want to do is you  want to check let the meter go up and  fly you want to check between each pin
of the magnetron – the body itself you  should see no reading show up on this  meter alright nothing if you see
something happening it’s not a good sign  check that one oK we’ve established that
the magnetron is good now on to the next  step  okay the magnetron is all back in since
we’ve verified that’s okay the  transformer you verified from my other  Blog that’s okay
make sure the connector goes back in the  same way you took it out this wire here  goes with the diode so that’s going to
leave us two things to check out now  we’re going to check out the capacitor  and the diode now usually when a
capacitor is bad when you go to hit  power on you will experience a  short-circuit blowing the fuse or the
circuit breaker and if your diode is not  proper if your diode is not working good  you’re not going to have good heating of
the food and you also may have a louder  noise coming from the magnetron a  different sound like a different hum
then you want to check that out so we’re  going to check out the capacitor first  and simple to check
okay so now you want to remove the clip  the clamp holding down the diode and the  capacitor the diode can only go in one
way it’s got a ring connector here and a  blade connector here so reach down okay
that’s that and the screw is right here
nice to have a magnetized screwdriver  you’ll see the line on
the diode goes to  the chassis open up this a little bit
lift up and pull the capacitor out back  away a little bit all right
so there’s a  capacitor okay so to test the capacitor
is very simple once you remove it and  you know for a fact it’s been discharged
just double check by touching the terminals together all right put your  meter on  M setting
one probe with the  meter goes to one terminal and the other
probe goes the other terminal now when I  connect it you want to
see a high  reading like in the millions like five
million and you want to see it slowly go  higher and higher and higher like
two  ten million that would indicate a good
capacitor four million five million six  seven as long as it does that you’re  good you don’t want a low reading if you
get anything that stays where you  connect it or moves lower that’s a  problem
the next test to verify if this is any  good  leave one terminal connected and take
the other terminal on the  Meg’s setting or  if you have it and
connect it to the can you want to make  sure there’s no connection between the
terminal and the can now let’s take this  one off move it to here and you notice
no change in the meter so it’s acting
properly and there’s no connection on  that range so this is good to go ruled
out the capacitor all right now the way
to test the diode is the last part the  test is fairly simple if you have a  meter that can go very high like
mega ohms and if you don’t have that now  what you’re going to do is you’re going
to refer to the link that you see right  here it’s going to take you to my  microwave oven testing Blog and you’re
also going to see a number in that link  which is going to open in a separate
window you won’t lose this window  because that will allow you to jump to the part in the Blog
where this testing  is done now if you do have a high  resistance DMM
and the next step to do  the next step would be to put this on a
high setting of say  let me take my  wires  without using your hands you’re going to
take the meter and you’re going to put  one on the one lead and touch this lead
one direction should go hi all right and  it should level off around  or mega ohms that’s fine
 now when you flip it around you  should get a low reading around  or
so okay that’s a good one so you just
confirmed that this one is a good one  this test works all the time as long as
you have a high resistance meter and  that’s about it that’s all the parts
that you can check make sure all the  wiring harnesses and the connectors are
plugged in properly make sure there’s no  loose connections and you should have no
problem figuring out why your microwave  is not working properly if any of these
tests failed or you have any loose wires  you should have discovered them by now
if you have any other questions please  post them in the comment section I can
assist you that way if you found this  Blog helpful please rate it
and also post links to this  Blog on other websites and blogs thank  you
Microwave Ovens Safety: Do’s & Don’ts

safety do’s and don’ts in this article we will tell you about the safety precautions to be taken.

Never cut the power cord to use local adapters. Never use extension bolts to operate the microwave oven.

Don’t use metal utensils in micro mode.

Don’t use plastic utensils in grill or convection mode can use microwaves safe glass utensils in all the modes.

Never use aluminum foil in micro mode.

Followed by above process Don’t cover the top of the microwave oven with cloth denial sheet polythene etc.

during operation don’t put anything on the top of the microwave oven

Don’t open the cover or cabinet of the microwave oven by yourself it is the high-voltage product, and

you may get the electric shock.

Followed by Don’t use the product for other than cooking for example drying of clothes newspaper etc.

as it may catch fire.

Don’t heat or cook the food having heart charts bottles with the lid closed sealed containers etc.

as they may explode.

Followed by Don’t install the product near the water source.

Splashing of water into the microwave may cause electric shock.

Proper ventilation required to disperse the heat generated inside during cooking.

Before cooking, please check there should not be any food or cloth or

any other particle in between door and cavity. As it may burn.

Wear gloves to take out the cooked fruit or accessory. After preparing for it will be very hot.

Never eat food immediately after cooking in the microwave oven allow some standing time.

Liquids heated in the microphone should not be consumed directly after taking out from a microwave oven.

Stir them with the spoon before use.

Do not boil X in the microwave oven as the eggs may explode you.

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