Question about Panasonic NN-S540BF Microwave Oven

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Problem Hi, Inside the oven, on the right side, there is a plastic (?) 4.5 "X 3" cover. This thing is broken and a little piece of it has fallen down. This cover is held in place by three clips on three corners and a screw on the other corner. So it seems to be replaceable. What is it for ? Should I replace that cover ? Where can I buy one ? Thank you, Federico Tejeda

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This is the waveguide cover and it should not be broken. You have to replace it.

Posted on Jul 20, 2008

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Sharp r520kst door wont stay shut


If the door will not stay closed it is the spring inside door, or the small plastic piece that holds the spring which is attached to the $80.00 piece called outer door.
To fix it, it is EASY and you do not have to even take the inside cover all the way off. Just remove the three sides of cover by gently slipping a plastic putty knife around rim to release the clips. Then attach the spring to the small hole below where the plastic piece used to be, which is located in the metal on the glass frame piece, use tweezers, hold the other end of spring as you place spring onto plastic door latch and set into place!
Snap the inside cover back on and YAY! FINI!

Mar 23, 2013 | Sharp R-520KST Countertop Microwave Oven...

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When using the oven tonight, i saw sparks coming from the plasic clip on the right that holds the rack up. i tried again later and still hearing crackling/sparks. is it possible to replace that...


Yes it is possible to replace the plastic clips. However thats not the problem. The problem is exposed metal under the plastic clip. Remove the clip and you will see it. You need to sand it down so that it is smooth, then use ceramic paint to cover up the exposed metal. You should check under all 4 clips to be safe. Clips are a little tricky to get out, just insert a screwdriver on either side and pry gently.

Mar 01, 2011 | KitchenAid KHMS155L Microwave Oven

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I have a Samsung SMH9187ST microwave, it is about 2 years old. The door won't stay closed. It is worthwhile to try to fix it or should I just replace it?


If you can lift the plastic door latch catches with no resistance, it is most likely the spring/plastic connector. I removed the door by lifting up, pulling the bottom forward, and lowering. I removed the inside black plastic bevel with a jewelers flat screw driver, prying from the latch side's external edge. Once it was started, I could pull it of with a gentle lift. I took out the black plastic latch, drilled a hole near the broken piece and all was good. Samsung is not on my radar for any future purchases. This is the 3rd major purchase that barely made it past warranty or not even thru warranty.

Dec 31, 2010 | Samsung SMH9187ST Microwave Oven

1 Answer

On the inside top right side of the microwave there was a cardboard cover held on by 4 corner points. The cardboard has fallen out now as it has come unsecured from the points holding it in place. Is it...


That's the waveguide cover.

If your waveguide cover is burned or damaged, it will need to be replaced.

It provides critical protection for the magnetron.

You should be able to get Galaxy parts from the Sears site.

To find helpful exploded view diagrams and get part numbers, you can just enter your full model number at the Sears parts site.

A full Galaxy/Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########


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

Sep 06, 2010 | LG MS-0744Y Microwave Oven

1 Answer

The plate is no longer turning


Hi, It could be one of three things.

The first and easiest to check is the coupling. Pull the plate off and under it, in the center of the oven is a small plastic piece that drives the plate. This coupling will pull straight up. Look to see if it split down the stem, if it is broken that needs replaced. If it is okay then we have one of two issues, both requiring you to disassemble the microwave and take meter readings. Do you have the ability and access to a good ohmmeter?

May 04, 2010 | Emerson Black Microwave Oven

1 Answer

Some pieces have fallen off the inside upper surface of the oven.


DO NOT USE THAT OVEN !! TOSS IT OUT ESPECIALLY IF YOU HAVE NEIGHBORS WITH A PACEMAKER! YOU COULD WIPE OUT A BUNCH OF FOLKS DEPENDING ON WHERE YOU ARE!

Aug 25, 2009 | Whirlpool MH7130XE Microwave Oven

1 Answer

Replace the bulb in Panasonic microvave Model nn s 768ba


Hi all,

I have just replaced the bulb in my Panasonic NNA873 Dimension 4.

Please be careful,although it was an easy job, there is a capacitor inside which stores heavy loads of power and will release the electricity into you if you touch it!

YOU CANNOT REPLACE THE BULB FROM INSIDE THE MICROWAVE....... DO NOT REMOVE THE CARDBOARD-STYLE COVERING WHICH IS ATTACHED WITH ONE SCREW INSIDE THE MICROWAVE ON THE RIGHT.

To replace bulb will take 5 minutes.

UNPLUG microwave. Remove the outer cover by unscrewing about 6 screws (ordinary phillips) don't lose them into the workings.......

Bulb is located on the right side, nearer to the front. You cannot see the glass of the bulb, only the black plastic end piece, as the bulb sits upside down and vertically. Best if you check out what a T170 looks like on the internet, then you will know what you are looking for. For my Panasonic I needed a T170 (but be careful, they have different ends, some are straight, some right angled - mine was right angled - check before you buy and no, I don't think you can get them from any ordinary supermarket etc!!). Do not touch the bulb when replacing as the oil on your fingers will shorten its life.

Old bulb can be removed by taking out one screw and then pulling off the connectors - there is a little tab to push down to ease them off.

Then simply replace bulb!

When putting cover back on make sure all the tabs on top and sides go inside not outside casing.

Good luck. This is an easy job, just don't poke around anywhere else.

Oct 30, 2008 | KitchenAid KBMC140HSS Convection/Microwave...

1 Answer

Interior cardboard/foil piece fell off revealing small chamber inside oven--still safe?


This is the mica or plastic waveguide cover. It protects the waveguide and magnetron form grease and food particles.

Assuming you're going to scrap the unit, carefully clean the area around the outside of opening (watch for sharp edges) with a lightly damp soft cloth.

Then use alcohol or a hair dryer, etc. to be sure the area is dry.

Then you can use a couple of strips of clear packing tape to cover the opening and trim it with a razor blade so only about 1/4" or so extends out from the opening.

Note that I only recommend this procedure on an oven that is going to be scrapped. If the oven will see continued use, a new waveguide cover should be purchased.

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

Oct 22, 2008 | Microwave Ovens

1 Answer

Takes much longer now to heat things


I think you have two separate problems.

Taking a long time to heat is almost always a failing magnetron.

The cover on the side is the waveguide cover. If your waveguide cover is burned or broken, it will need to be replaced.

It protects the waveguide and magnetron from grewase and food particles, which can cause arcing and damage.

Hopefully your oven is just under the one-year mark and GE will fix it free under warranty.

Otherwise, they will replace the magnetron at no part cost, but labor will be your responsibility.

GE Customer Service is at http://www.geappliances.com/service_and_support/contact/

We're happy to help and we appreciate your thoughtful rating of our answer.

May 10, 2008 | GE Advantium 120 Convection/Microwave Oven

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