E-5 error code

E5 code refer to fuser unit.To dfisplay both digits press the Enter.
E 52 Fusing error 1 Defective thermistor,heater lamp open,defective main or ac/dc drive board.
E 53 Fusing error 2 thermistor in shortcircuit,fusing harness shorted or ac/dc power supply board defective.
E 54 fusing error 3 main board or ac/dc board defective.
E 55 Fusing error 4 rhermistor open,defective main board or fusing lamp open.
When E5 service call condition occur for safety reasons they cannot be cleared by turn OFF/ON the power switch.After repairing the copier turn ON the main switch.Enter in the SP mode and press 97.Turn the main switch OFF wait 10 sec and turn ON.