Lexmark Optra S Service Manual - Page 76
LVPS and AC Fuser Lamp, the Diagnostic Print Test
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4059-XXX FRU 2 Fuser Lamp 3 LVPS and AC Fuser Lamp Cable 4 Fuser Top Cover Assembly (Thermal Fuse/Thermistor Assembly) Action 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. Disconnect the fuser lamp connector at the fuser assembly. Turn the printer on and check across the pins on LVPS end of the cable for line voltage. If incorrect, turn the printer off and disconnect the power cord and check the continuity of the AC fuser lamp 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 2-49 4059 Service Manual