Try contacting the Manufacturer they show have replacement parts available for your unit.
SOURCE: Kenmore Galaxy Microwave Hood Combo Model 72180002400
Since it sounds louder than before, it is probably a bad high voltage diode or magnetron.
If
it's within the magnetron portion of the warranty (usually 5-9 years)
but out of the original full warranty (usually 1 year), then your
manufacturer will cover the part cost, but not the cost to visit you or
the labor charge to do the work.
Here are some links you or someone you know can use for test help, but read their safety warnings first:
http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html
Sears may send you a magnetron to install yourself since it's under warranty. For that or warranty service, contact Sears at http://www.sears.com.
You can save about $75 by taking it to the shop yourself, as opposed to an in-home service call.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
SOURCE: Cleaning Inside Glass Oven Door of KitchenAid KEMC308KSSO
Normally
you have to separate the door panels (as shown in the attached photo)
and then you'll see the previously hidden screws you need to remove.
Or you can watch a YouTube video (not a video I made) here that demonstrates how it's done.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
SOURCE: kenmore galaxy microwave model 721.80002 1500 watts does not heat
With the symptoms you
have, I would most strongly suspect a shorted high voltage rectifier
diode or a bad magnetron, or a loose and possibly corroded connection on the magnetron's terminal.
The diode is a fairly
cheap fix, and the mag will cost more.
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.
There
should be a "mini-manual" (tech sheet) hidden inside the unit
behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating components.
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.
If you don't find yours, or if you want to look at it without disassembling the oven, you can download it here.
Here are some links you
or someone you know can use for test help, but read their safety
warnings first:
http://www.gallawa.com/microtech/diode.html (if it's not shorted, it's
probably okay)
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html
We're happy
to help you with free advice and we'd appreciate your thoughtful rating
of our answer.
SOURCE: kenmore elite microwave/vent hood model 721.80834500 turntable
Take your round glass tray and plastic three wheeled hoop to a local Sears store, open up the microwaves on display, find the one that is still using something similar, deftly trade out yours for theirs. The new wheeled plastic hoop wheels are slightly bigger and the glass tray raised guides are a bit longer, since the switch no problems like I had. Don't get caught. They do not have those parts for sale at the local Sears store.
Replacing the turntable motor.
The motor assembly is fixed to the base
of the oven usually with two screws and access i obtained by removing
the inspection plate directly beneath the motor. It is usally a plug
in synchronus motor that revolves at a few revs per minute but the
plastic cogs in the motors gear box fail and the motor assembly must
be replaced. They are fairly inexpensive and obtainable usually from
a domestic appliance repair shop.
If you feel confident,
disconnect it from the mains power, remove anything in the cavity and
turn it upside down if it is a tabletop model, a little more
complicated if it is built in!
Remove the inspection plate and
disconnect the motor. Remove the motor and go and get a new one. Re
fit it and put the microwave back in its position. Plug it back in,
with the turntable and plate. Put a cup of water on the plate inside
of the oven and heat for 20 seconds to check the plate goes
round.
Hope this helps.
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