Hi, I have an old microwave oven, which was given to me by my friend one year ago. This microwave oven works and had several programming functions, such as bake, broil, roast, grill etc, although I never use these functions. The main problem is that when I heat some food, the temperature is not evenly heated. Some part of food is hot while other part is cooler. Because there is no mechnic rotating plate at the center of the oven, I don't know whether this is a problem or not. I have checked the website of http://www.repairfaq.org and find no clue there. Could you tell me more about this? Thanks in advance.