Lexmark Optra C Service Manual - Page 47
Error (111/112) Fuser, Warm-Up/Temperature Low, Diagnostic Information 2-15
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5045-001 Error (111/112) Fuser, Warm-Up/Temperature Low FRU Action 1 Poor connection Check the connections of DC controller PCB connector J112 and mechanical controller PCB connector J2007. Reconnect them. 2 Thermistor/ wiring Turn the power switch OFF, remove the fuser unit, and measure the resistance between fuser unit connectors J21-5 and J21-6, see "Fuser Connector (J21)" on page 5-37. Is it between 180 Ohms and 280 Ohms (normal temperature)? Check the wiring between DC controller connector J112 and the thermistor, and if it is normal, replace the thermistor. 3 Fuser upper heater/ thermoswitch Is there continuity between fuser unit connectors Thermoswitch J21-1 and J21-2 when the fuser unit is removed? See "Fuser Connector (J21)" on page 5-37. Check the continuity of both the fuser upper heater and the thermoswitch, and replace defective parts. 4 Fuser lower heater/ thermoswitch Is there continuity between fuser unit connectors Thermoswitch J21-3 and J21-4 when the fuser unit is removed? See "Fuser Connector (J21)" on page 5-37. Check the continuity of both the fuser lower heater and the thermoswitch, and replace defective parts. 5 Thermistor mounting Is the thermistor uniformly connected to the fuser lower roller? 6 Thermistor soiled Is the thermistor surface contacting the fuser roller soiled? Clean it. 7 Power supply unit (low voltage) DC controller PCB/ Mechanical controller PCB Replace the power supply unit. If the problem remains, replace and check as follows: 1. DC controller PCB, see "DC Controller Board Information" on page 2-2. 2. Mechanical controller PCB. Diagnostic Information 2-15