Lexmark Optra C Service Manual - Page 57

5045-001 Error (141) Power Supply Failure (LVPS 110V or 220V) FRU 1 Wrong fuser unit (New fuser or machine) 2 Fuser upper heater / thermoswitch 3 Fuser lower heater / thermoswitch 4 Power supply unit (low voltage) DC controller PCB Mechanical controller PCB Action Turn the power switch OFF, and remove the fuser unit. Do the power supply rated voltage and fuser unit rated voltage correspond? Replace the fuser unit so that it corresponds to the power supply rated voltage. Is there continuity between fuser unit connectors J21-1 and J21-2 when the fuser unit is removed? 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? Check the continuity of both the fuser lower heater and the thermoswitch, and replace defective parts. Replace and check as follows: 1. Power supply unit. 2. DC controller PCB, see "DC Controller Board Information" on page 2-2. 3. Mechanical controller PCB. Error (142) Engine Board Memory Failure FRU 1 DC controller PCB Action Replace the DC controller PCB, see "DC Controller Board Information" on page 2-2. Diagnostic Information 2-25