Hi and welcome to FixYa
I am Kelly. You either have the wrong glass tray or one of the wheels on the lower caster / spinner is stuck. I think you have the wrong tray. Daewoo
uses several different sizes of glass trays. See this link for examples: (and they are too small!)
Note the 10" (254 mm) / 11 3/4" (279 mm) / 12 3/4" (323 mm) sizes and the difference of the caster guides on the bottom of the plates.
I have been trying since 1 minute after you posted just to cross the KOR
-1B4H number to a parts reference without success.
I did find one reference here: The price of the tray is outrageous!
Part number is: Z11-KOR-1B4H -221 $94.33
Honestly I would probably use the email link on the page and ask what the size was of the tray and then SHOP SOME WHERE ELSE!
The interior dimensions of your microwave are:
14-1/2 in. W x 9-7/10 in. H x 15-1/2 in. D
I searched ebay and came up with this link: http://shop.ebay.com/sis.html?_kw=Daewoo+KOR1NOA+Carousel+Microwave+Turntable+Tray-Glass
I think your turn table will be the 2nd one on the list. 14 1/4" That only leaves
1/8" clearance on each side of your unit. The last 2 on the page may be a better match at 13.5 inches leaving 1/2 in. clearance on each side of the turntable.
You can try and email them here and ask what is the replacement part number for the glass turntable: (also ask for a source!) email@example.com
I understand now why you asked FixYa
for help. This one was a real challenge.
Thanks for choosing FixYa