Lexmark E238 Service Manual - Page 121

4511-xxx 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 AC cables LVPS/HVPS 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 J6 on the controller card. Check for excessive toner buildup on the surface of the thermistor. Clean as necessary. With the printer unplugged, disconnect the thermistor cable from J16 on the controller card. Measure the resistance of the thermistor. The resistance measures from approximately 1K ohms immediately after printing or POR to approximately 240K ohms when the thermistor reaches room temperature. (It may take 30 minutes to cool.) Replace the fuser assembly as necessary. Hot fuser service check Note: Ensure correct lamp is installed. FRU Fuser AC cables LVPS/HVPS Fuser Action Measure the resistance of the thermistor. The resistance measures from 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. Diagnostics-all models 2-89