Replacing consumable items 2 To clean the toner density sensor 1 Open the ITB drawer and remove the cleaning brush mounted inside. 2 Open the drum drawer and remove the imaging drum using the blue handle. 3 Using the cleaning brush, remove all dust and toner particles from the sensor as illustrated. 3 4 Replace the imaging drum. 4 C7085-90921 Chapter 4 Printer maintenance 85 1 Cleaning the toner density sensor Clean the toner density sensor whenever the imaging drum is replaced DENSITY SENSOR OUT OF or when the control panel message displays: RANGE . CAUTION To avoid scratching the sensor, do not clean it with any paper products.