Lexmark T620 Service Manual - Page 94

4069-5XX/7XX 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. Note: If the correct lamp is installed and you still have 925 fuser errors, try the following: 1. The fuser may have reached standby temperature too quickly. Check the fuser assembly, system board or LVPS. 2. Ensure that the correct hot roll is installed. 3. Check the AC line voltage to ensure it is not above the maximum rating for the printer. 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. The resistance is: HOT - J2-1 - J2-2 = 2.5K ohms COLD = 150K ohms to 260K ohms 2-66 Service Manual