279Cleaning the toner dust sensorCleaning the toner dust sensorNote:When replacing the fine filter, toner can enter the toner dust sensor.To clean the toner dust sensor[143]Proceed as follows:1. [380]Loosen plastic screw.2. [381]Clean opening with a roundbrush (see Cleaning agentsand devices, cleaning intervalson page 252). Before use,sharply angle round brush inthe middle and insert in theopening.For function control, the LEDmust light up when the roundbrush is being inserted and gooff when it is removed.3. [382]Tighten the plastic screw again.
