Lexmark Optra C Service Manual - Page 49
Error (115) Fuser Heater Off, Error (116) Fuser Unit Missing, Diagnostic Information 2-17
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5045-001 Error (115) Fuser Heater Off FRU 1 Fuser upper heater / Thermoswitch 2 Fuser lower heater / Thermoswitch 3 Power supply unit (low voltage) DC controller PCB Mechanical controller PCB Action Turn the power switch OFF, and remove the fuser unit. Is there continuity between fuser unit connectors J21-1 and J21-2? See "Fuser Connector (J21)" on page 5-37. Check the continuity of both the fuser upper heater and the thermoswitch, and replace defective parts. Is there continuity between fuser unit connectors 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. Replace the power supply unit. If the failure remains, replace and check as follows: 1. DC controller PCB, see "DC Controller Board Information" on page 2-2. 2. Mechanical controller PCB. Error (116) Fuser Unit Missing FRU 1 Fuser Action Ensure the fuser unit is secure and making electrical contact. Diagnostic Information 2-17