Salvadore P Chicago , IL January 06, 2015 Appliance: Frigidaire Range PLGFZ390ECF Frigidaire Range Plgfz390ecf: Screws heads broke off in the burner!!. How to replace Ignitor/Orifice Assy. We were taking the range apart to replace a different part when the screws securing the burner to the maintop completely broke off. Replacing the burner was not that difficult. You should definitely keep track of what screws are being removed and where the go. There are several screw that will need to be removed in order to secure the gas connection. Not difficult, just need some organization and attention! Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes