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Diode had burnt out
Take off top facing over microwave using screwdriver also protection plate for diode and capaitor. Disconnect diode from frame, bracket to capacitor then remove, disconnect wires leaving diode on capacitor for right connection, replace, rewire done.
Piece of cake. One screw to release the dropdown light diffuser. Just remember, the you're screwing the new bulb in from a reverse perspective. Also this site sends the correct part the first time.
Removed the microwave from above the oven by loosening the two screws above the microwave. As the unit tilted outward lifted up and the whole unit came out all the time feeding the power cord through the cutout for the power cord. After it was out removed the cover and identified the capacitor and made sure it was discharged and removed and replaced the diode. tested before reinstalling and it heated up just fine. Reversed order and reinstalled . Very easy job maybe a second hand to help fish the power cord when installing and removing.
Easy install ... just removed a couple of screws and had pry the plastic cover and trim around door. i did break a couple of clips but it did not affect the door when reassembled. Youtube it
Unpacked the vent grille and walked to the microwave. Lifted grille up to the vacant space. Applied a small amount of pressure while pushing the grille into place. Walked to the refrigerator to fetch part one of an Egg Nog beverage, then to the cupboard for the best part of the Egg Nog beverage. Stirred ingredients and continued with decorating the Christmas tree. Voila!
Really easy for a 75-year old female; just spent more time reading the online manual than actually installing the light bulbs to find out where to access the light bulbs.
The close door warning kept coming on and the microwave would not run
Don't waste your time with other parts stores online. Partselect sells quality parts and they arrived 2 days early. I purchase a door switch from another online store and the switch was defective.
We needed a phillips head screw driver to remove the single screw holding the light bulb cover in place. Removing the old bulbs was a little work, because they had come loose from the sockets. We unplugged the microwave, so we could grip the sockets with a tool. I think my husband used a needle nose plier for this. The new bulbs screwed in easily, and then we refastened the light bulb cover with the phillips head screw driver.
Remove the two screws to the plastic vent strip at the top of the unit. That exposes a metal cover (upper right) held in place by two more screws. (Found that removing the screw holding the key panel in place and moving that out of the way made for more work room) Remove the metal cover. The HV diode (visible) on one end is secured to the chassis by a screw. The other end is fitted to the HV capacitor. So unscrew one end and pull the HV diode off the capacitor. The replacement fits on like the old one came off. Very simple repair. But it would be safe to short the capacitor terminals to the chassis first. Noticed that it appeared the sparking was caused by the HV diode's outer casing being worn by the asbestos covered wire next to it and laying against it. I made sure the two were not touching, before putting the covers back on. Also, the problem started with an occasional spark when the MW started. It quickly deteriorated to a full, non-stop electrical sparking. You can hear it, smell it, and see it through the top vent. You don't need to remove unit to work on it.
Thanksgiving night, I found a rather large crack in the grille and it wouldn't stay in place. I placed the order for the replacement grille on Friday and received the new grille Monday. It just snapped in place, no tools necessary. I had contacted the Sears parts replacement department and all I got was attitude from the parts "help" desk. I'm glad I placed the order with Parts Select, the cost was cheaper and shipping was faster. I won't hesitate to use Parts Select the next time I need a part for any of my Whirlpool appliances.
