Oki Data CONFIDENTIAL43163501TH Rev. 1 156 /7.5.2.(13) Toner cartridge is not recognized (Error 540, 541, 542, 543)(13-1) Consumable errorID unit and toner cartridgeConfirmation TasksIs ID unit set in position?Check whether lock lever of toner cartridge is locked.Action at NGReset normally.(13-1-1) Mounting condition of ConsumableConfirmation Items(13-2) Toner sensor errorToner sensorToner sensorConfirmation TasksDoes the core of toner sensor get dirty from toner?By using the switch scanning test function of the maintenanceutility, check whether the sensor is normal. Check whether theSCAN condition is changed with a white paper covering infront of sensor.Furthermore, start the printer with right side cover removed,and check whether the red lamp of toner sensor blinks overPRE board.Action at NGWipe the dirt of sensoroff.Replace the tonersensor board (PREPCB) or main board(BLA PCB) or FFCbetween PRE-BLA withnew one.(13-2-1) Toner sensor conditionConfirmation Items
