Any repair on a door or door latch mechanism needs to be accompanied with a microwave leak test. So you'll have to buy a microwave leakage meter first.
I'd suggest you find an exploded parts view of the oven for a hint on how to get it back together. If it came apart on its own, though, there's a good chance something is broken in the mechanism.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0
SOURCE: Door latches to microwave broken
I assume you're talking about the spring that keeps tension on the door hooks (latch heads, as they're called by Sharp). When you shut the door, the "hooks" are held down by this spring to actuate the door switches. To fix this, you'll have to separate the door panels. You can download the service manual from my Web site. There's a loop built into the latch head assembly and sometimes the loop breaks. If so, you can drill a tiny hold in it and reattach the spring there. There may also be a loop on the innner door panel to hold the spring. That one can break, too. If it's broken, you'll have to find a way to secure the spring to the panel. If the panel material is thick enough, a tiny screw eye could be inserted, then epoxied overnight to secure it. I've attached a diagram to this message that should help you. If that doesn't help you, I have the service manual for the R1600-series microwaves on my Web site at: http://www.microwavedisplay.com/R1610.pdf Repost if you need more help.
SOURCE: Door Disassembly
Actually, the spring is probably okay. What breaks is either the latch head (with the hook-like protrusions) OR the spring mounting tab on the inner side of the outer door panel. The spring connects to both of these parts. The outer door panel is not availablke as a separate part, so if that's where the break is, you'll have to get a bit creative and clean it squeaky and use epoxy (like JB Weld, but never use "super glue") or you can drill into the panel slightly and install a small screw eye or glue it in place. Even if the spring mount on the inner door panel is not yet broken, while you're in there, it's a good idea to clean it squeaky and add some epoxy to strengthen it. To get to the screws, you have to remove the choke cover (see sample photo below). It's usually not necessary and is better not to remove the door. You can set the oven on its left side on a table top, open the door carefully, and ease it down to the table top. Then you have a level, stable area to work on the door. If the problem is the latch head (ref # 5-2-2) then I would recommend replacing that part instead of gluing it. That's because the new part may be an improved version. Plus you'll start out fresh. The part # is LSTPPB030MRF0 (zero on the end, not an "oh") You can order Sharp parts from http://wwww.wehaveparts.com You can find a helpful exploded view of the door here: http://207.234.249.73/mwd/r1480_control_door_exp.pdf
SOURCE: Microwave door
That would be the service manual. You could contact Kichenaid for that, but I doubt the manual's necessary just yet:
http://www.kitchenaid.com/custserv/service.jsp
You can find helpful exploded views of this model here: http://tinyurl.com/gv383
Unless you're replacing the entire door for some reason (what an expense!) then it's not recommended that you remove the door. If so, you'll have to carefully mark the hinges and the door to be sure you get it back in exact alignment. Otherwise, you'll have a chance of microwave leakage.
Instead, the door panels should be taken apart and then you can remove only the panels and parts that are needed.
In most cases, there is a choke cover on the inside surface that needs to be carefully pried apart, and that will allow access to the hidden screws, as the sample drawing shows.
Usually the exploded view is all that's needed, but if you nned more help, the service manual is the next step.
SOURCE: spring for the door latch is broken
As a follow up to MicrowaveSvc: first thanks for the insight. Second I found the spring mount entirely broken off from the door. I did find an anchor point molded in the door near the bottom. I tied a length of waxed whipping twine between the anchor point and the spring and adjusted the length to make the spring firm. I have a picture if you can tell me where to send it. David Smith
SOURCE: How to install latch and spring in microwave door
You need to know where the 'catches' are inside the choke cover on the door to remove it carefully without breaking anything or marring the cover. You might get inside and find that the post for mounting the return spring has broken and that is part of the outer door panel.
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