Lexmark Optra T Service Manual - Page 76

4069-XXX FRU 1 Fuser Lamp (Incorrect Lamp/925 Service Error) 2 Fuser Lamp 3 LVPS LVPS to Fuser Auto Docking Connector Fuser AC Cable 4 Fuser Top Cover Assembly (Thermal Fuse/Thermistor Assembly) Action Install the correct voltage and wattage lamp or fuser assembly. Remove the controller board. Run the Diagnostic Print Test and observe the lamp through the left side frame. If the lamp doesn't come on, unplug the printer and check the continuity between the two pins on the fuser lamp cable going to the fuser assembly. If you do not measure continuity, remove the fuser assembly and check the continuity of the lamp. If incorrect, replace the lamp. If correct, replace the fuser cover assembly. Turn the printer off. Remove the fuser assembly. Turn the printer power on. Measure across the AC fuser cable pins for line voltage with the cable connected. If incorrect, turn the printer off and disconnect the power cord. Check the continuity of the LVPS to fuser AC cable. If incorrect, replace the cable. If correct, replace the LVPS. Disconnect the thermistor cable from the fuser board at J2. The resistance is as follows: HOT - J2-1 - J2-2 = 2.5K ohms COLD = 150K ohms to 260K ohms 2-48 Service Manual