Lexmark Optra E Service Manual - Page 41
Diagnostic Information 2-19, 06C and 06F
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4026-0XX FRU Action 3 Thermistor If the fuser lamp comes on and a fuser failure LED error code displays, be sure the thermistor is contacting the hot roll and the thermistor cable is firmly seated in connector CN2 on the engine board. Check for excessive toner buildup on the surface of the thermistor. Clean or replace as necessary. Turn the printer power off and disconnect the thermistor cable from CN2 on the engine board. Measure the resistance of the thermistor between CN2-1 and CN2-2. The resistance should measure 250K ohms or less. If incorrect, replace the thermistor and cable assembly. If correct, replace the engine board. Note: The thermistor assembly is fragile. Use care when handling to avoid damage. 4 Fuser Lamp If the fuser lamp does not come on and a fuser Cable failure LED error code displays, unplug the printer power cord and check the continuity between the fuser cable contacts in the lower fuser cover. If incorrect, check the continuity of the fuser lamp, thermal fuse and terminals. Repair or replace as necessary. If correct, check the continuity of the fuser lamp cable. If incor- rect, replace the cable. If correct, replace the fol- lowing FRUs one at a time in the order shown: Engine Board LVPS If the lamp does not come on and the Error LED is on solid, go to the "Fan Service Check" on page 2-17 5 Fuser Ther- Check the fuser thermostat if the fuser lamp mostat (4026- does not come on or if it comes on and does not 06C and 06F) go off. Unplug the printer power cord and check the thermostat to be sure that it opens and closes properly. Replace as necessary. Diagnostic Information 2-19