Darlys K Allison , IA July 17, 2015 Appliance: Maytag 27" Built-In Electric Oven Self-Clean MEW5527DDB16 Maytag Oven Mew5527ddb16: One of the posts on the terminal block was black from sparking as the nut wasn't tightened. How to replace Range Terminal Block. We had the "handyman" from the local Hardware/Lumber Yard come to do some replacements for us with a built in oven and drop in stove and he seen the blackened area on the oven and suggested we have it replaced or it could cause a fire hazard. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes