My sisters has a Sharp microwave r-403hw was manufactured july 2003 my question is how long are you allowd to keep a microwave for and if the inside chips from the paint is still ok to cook food in it or do we need to by a new one?

Changing the light bulb on your Sharp carousel microwave will allow you to have needed light inside the oven. Microwaves are not designed for consumers to change the light bulb due to manufacturer liability, but it can be done. Following the proper steps will ensure a successful installation. Step 1 Unplug the Sharp carousel microwave from the electrical outlet.
Step 2 Locate the screws around the outer cover of the Sharp carousel microwave and unscrew all the screws.
Step 3 Lift off the covering.
Step 4 Locate the bulb and unscrew. Screw in your new bulb.
Step 5 Replace the cover and screw back tightly. Once done, test your new bulb.

All microwave ovens are required by law to have the date of manufacture printed right on the label that has the model and serial number on it. Look inside the microwave, usually just inside the door.

If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27

Sounds like the power relay has quit. Time for a new one.

Hi,

You can buy the turntable online here:

http://www.partstore.com/Part/Sharp/Sharp/R403HW/Sharp/Sharp/NTNTA108WREZ/New.aspx

Replace the KeyPad will fix the problem

pull the case, there are 2 diodes in the magnatron curcuit, usually one or both blow, only once have I had a magnatron go open cct, there are only a few manufacturers so I use old ones for spares.

may be the hi voltage . or a loose metal panel but its not normal and wiil probably lead to a failure like no heat . . most common would be a fan motor / high voltage / transformer / hope this helps **** ..

your safety door relay is way out of adjustment

This is a simple problem & solution.

Quite often this is due to grease or food particles stuck somewhere in the cavity of the oven or stuck on or behind the waveguide cover.

The waveguide cover (also called a spatter shield) is usually about the size of a playing card and often held in place by a plastic rivet.

It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!

The cover and the metal behind it should be cleaned with a mild, non-ammonia cleaner.

If the cavity metal of the oven is chipped or charred, it will have to be sanded smooth and clean and dried thoroughly.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.

Since your waveguide cover is damaged, it will need to be replaced. It provides important protection for the magnetron.

You can order parts from Encompass here or you can call them toll-free at 866-779-5835.

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

Yes that noise is causing your fuse to blow. Machine gun sound sounds like the High Voltage Capacitor or High voltage diode is bad. (Loud humming sound is usually a bad magnetron or bad power transformer). Most of these parts are inexpensive, except for the magnetron. But most of the repair bill is most likely going to be for labor.

Based on your model, it looks like an over the range microwave. And to fix any of these problems require the removal of the microwave from the wall. So its up to you if you want to deal with that hassle. But you also have to consider that you'll probably have a hard time trying to find a new microwave that will fit.