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4-90Troubleshooting● Possible Cause: The temperature does not climb to the target value within set up time. Thermistor isdefective.● Error message : System Error :#02-001 Please turn off then on.● Troubleshooting method :● Symptom : At Warm-up, this error has occurred. The machine does not work until power off/on.● Code :02-001Normal DefectiveBeltRoller1. Check if the fuser unit is installed in the machineproperly. Turn the machine then on.* If the error persists, follow the next step.2. Check if the fuser is overheated.Take off the fuser. Check if the belt and roller isdefective by rotating the gear.3. Check if the Thermistor is broken. (Thermistor :Parts catalog P.65 No.53 item)4. Check if the Thermistor is contaminated. Clean itcarefully.* After following the above step 2,3,4, re-install thefuser unit and turn the machine off then on.If the error persists, follow the next step.5. Update the latest FW.* If the error persists, follow the next step.6. Check if the thermistor connector on the EngineBoard is connected properly or harness is defective.7. Remove the Rear Lower Cover and SMPSShield. And check if the harness on FDB isconnected properly.* If the connection is OK, replace the FDB. Turn themachine off then on again. If the problem persists,replace the Engine board.FDB