How to find rectangular to round transition adaptor

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When it 'popped and died' that sounds like the high voltage capacitor shorted and blew the line fuse. If the diode shorted, it would just make a LOUD growling noise in cook mode. You need an ohm meter and you need to know how to use it. Be sure to use an insulated screwdriver to short across the two terminals on the high voltage capacitor, first, always before proceeding with any troubleshooting procedure. This sounds redundant but it is a MAJOR safety issue when working on microwave ovens. Developing this habit could save your life. If you can't reach across both of the terminals, touch the tip of the screwdriver to the metal frame or body of the microwave first and then to the terminal of the capacitor that has the diode connected to it. The diode is usually black and is either rectangular or round and one end is attached to ground on the frame or the body (chassis). Of course, the other end is connected to the high voltage capacitor. The problem could be something else but this is most likely the problem. Be sure to replace the HV cap with the same value ie; .94uF 2100 VAC.

Yes, if the unit is dead, unplug microwave oven, remove top, follow wires from keypad control board to the circuit board, look for a silver rectangular high voltage capacitor, "sometimes under a plastic flap" dis-charge capacitor across the two points with a screwdriver, there should be a fuse near by that is clipped in, pop it out and replace with the same current rating and assemble before test, "lethal voltages present"

The over-the-range will need to be taken down, unplug and remove the top, look to the right keypad facing you, follow wire from the control board mounted on back of the keypad to a circuit board, look for a silver rectangular high voltage capacitor and short out the two points, near by you should see a small fuse clipped in. Pop it out and replace with the same current rating, if fuse blows again check the door switches, usually one or two are faulty.

Fuse is located on the right side under the keypad, follow wiring to main board, should see a small fuse clipped in, pop it out and replace with same current rating. Before you do this unplug microwave, and discharge high voltage capacitor "silver and rectangular in shape" under plastic flap near fuse. One thought the voltages are lethal when running.

Yes! there is a main fuse, it is located under the keypad and in towards where the high voltage capacitor is "silver and rectangular in shape" but make sure oven is unplugged and high voltage capacitor is dis-charged because there are dangerous high voltages in that area. But I think you have a secondary problem in the oven, there might be a defective door switch or possibly the high voltage capacitor has shorted.

There is a piece of trim on the inside of the door.
This trim is rectangular, about 1/2" wide, and goes around the outside of the glass. the trim has rounded corners. Take a knife and gently insert at a rounded corner, prying the trim out. Once you can put a finger behind the trim, you'll find it comes off easily, revealing the lower handle screw.

From page 14 of the installation instructions online here:

"Extend the house duct down to connect to
the exhaust adaptor.

"Seal exhaust duct joints using duct tape."

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I need installation booklet on kenmore microwave #80419 can u help?

eastlake...only if you think so. Most of these units use a submounting bracket set and then you hook your oven to it. This is a rather nasty installation...I've done several. If it's sturdy, you may just want to put in a filler piece.