M457B Microwave - Instructions

First let me say that I tried several places to get what I thought was a simple light bulb. This included several national hardware stores as well as a national electrical supply company. No luck. Went to the manual and PartSelect. Not only did you have it in stock, ship right away,at a reasonable price it arrived in a matter of days. One would not normally think of receiving a "how to" video to change a light bulb but you did. That impressed me. Suffice to say the replacement went well and you can be certain the next time I need a part I will go to you first. I am also impressed with the organizations with which you are affiliated with. BBB, Norton, PayPal, money back guarantee etc. Thank You The entire process was made pleasant with your support.

Removed the glass cover and replaced the bulb. Very simple.

My son had to replace the bulbs because the screw that holds the bulb shield was so tight that I couldn't remove it. It was too difficult for me to do it myself.

It was a snap using the instructions given. The key is getting into the unit. I did have to use a multimeter to find the failed switch since there are two of that type.

Remove light cover. Replace bulbs Note. Light bulbs are 40W,Too much heat for bulbs & sockets

I removed light bulb cover shield,took out defective bulbs and replaced with new ones. 5minute repair

Microwave would not turn on. Lights and fan worked fine. Before the microwave stopped completely, it would turn the microware fan on even when door was open. I read the reviews and they were exactly the same issue that others were facing. Once I opened the front panel and got to the switches it was easy to figure out which switch was bad as it was the one that was soft (When clicking it). It was hard to take it out though (it seemed stuck). So, I used a plier to yank it out. I put in the new switch and everything worked just great! I would like to thank other comments that were left on the site to make my task much easier. Thank you (to the commenters on PartsSelect), you not only saved me money, but also ensured that I learn about the microwave more and give me the confidence that I could fix it.

First, unplug microwave. Unscrew two screws at top of microwave, slide grill cover left and remove. This allows access to single screw holding control panel. Remove this screw and lift up control panel to remove. Secondary door switch is black switch at lowest position. The switch is held in place by a lever in back and very hard to get to. Remove the wires plugged into the switch, then remove two screws holding the plastic switch mount that holds all three switches. These screws use a "star" type screwdriver. Once the plastic mount is free, lift it up, right, and tip it slightly to find the lever that will release the black secondary door switch (the lowest switch)...release the broken switch, snap the new switch in its place. Replace the plastic mount by lifting and replacing back into position and replace the two "star" screws. Now, replace the wires onto the new switch, and test operation. Replace control panel, and top grill. It goes faster than it writes...getting the old switch out through that difficult to reach lever was the hardest part...still less than thirty minutes.

Because the microwave is old and the bulbs, I believe, had never been changed I carefully tried to unscrew the bulb. However, when I went to unscrew the bulbs the end of the bulb broke off and remained in the socket. I used a few different tools then remembered that sometimes a raw potatoe can be used to unscrew the remainder of the bulb, but to no avail. Finally had to unscrew the whole underside of the microwave to remove the broken bulb. May I suggest that you have the socket face away from the wall to screw in the bulb instead of the socket pointing toward the wall. You need to know yoga just to manuver the bulb into the socket.

Watched How to repair a Microwave that turns on when the door is opened Video on the web. From this took a shot at the switch was the problem. When I removed the switch it was defective. The small button was in and when you turned the switch upside down the button would drop back into position. Ordered a switch for $25.oo , installed it and the microwave is working fine.

removed grill cover, removed bulb plate, unscrew bulb, screw new bulb in socket,put bulb cover back on and screw grill cover back on. no issues whatsoever.

Getting the old bulb out of the socket was not an easy job as the factory seals the base of the bulb to the socket and for what reason I do not know. The seal has to be broken away to remove the bulb. I broke the seal with a knife and then proceeded to unscrew the bulb. The bulb at that point shattered in my hand and I was left with just the base of the bulb stuck in the socket. it took much effort to be able to work loose the base with a needle nose pliers and much sweat. The installation however went very smooth and Part Select did a fine job of sending me the right part in a very short period of time. They are a great source for any appliance part needed.

undid plate exposing bulbs. Bulbs were blown to the extent that I could not see the size or wattage. Went to website, got the data ... including how to find the model and serial number plate, entered the info, looked at the exploded drawing, ordered 2 new bulbs and 3 days later they showed up at our door FedEX.

removed access panal, found soft switch as discribed on your web site. removed and replaced.

Removed the one phillips screw that holds the light lens in place, drop the lens down for access to the burned out bulb, screw in the new bulb, replace the lens.