Lexmark E320 Service Manual - Page 94

4500 Cold fuser service check Make sure the correct voltage lamp is installed. The voltage rating is stamped on one of the lamp contacts. FRU Fuser lamp Lamp cable LVPS Fuser Action If the fuser lamp comes on and a fuser failure light error code displays, be sure the thermistor is contacting the hot roll and the thermistor cable is firmly seated in connector J7 on the engine board (E320/E322) or J14 on controller card (E220/E321/E323). Check for excessive toner buildup on the surface of the thermistor. Clean as necessary. With the printer unplugged, disconnect the thermistor cable from J7 (engine board in E320/E322) or J14 (controller card in E220/E321/E323). Measure the resistance of the thermistor. The resistance measures approximately 1K ohms immediately after printing or POR to approximately 240K ohms when thermistor reaches room temperature. (It may take 30 minutes to cool.) Replace the fuser assembly as necessary. 2-64 Service Manual