Panasonic KX-MB771GR Service Manual

Contents

47KX-MB771GR6.12.9. TONER SENSOR.... ìTONER EMPTYî, ìTONER LOWî, ìCHANGE DRUMîThe Sensor detects whether or not the Drum unit and the toner are present.When there is not Drum unit, Hall IC (IC50) turns off, and the input signal of IC300-AE22pin (Main Board) becomes a High levelover 9s. When the Drum unit is set, Hall IC (IC50) turns ON/OFF. If the time of IC300-AE22pin's Low level is under 600ms, thereis enough toner in Drum unit, if not, toner is near empty.Toner SensorThe rest of toner is detected by the move speed of the magnet put on the pendulum of Mixing Paddle. The pendulum is pushedup by the Mixing Paddle, then it falls down by its own weight. The rotation speed of paddle is set slower than the one of pendu-lum which falls down by its own weight. When the toner is still left, the pendulum falls and stops on the toner, then pushed by thepaddle, it starts to rotate. When no toner is left, the pendulum falls to the bottom. Consequently the contact time between themagnet and Hall IC becomes short when toner is left and long with no toner.State Display Signal (IC300-AE22pin)Toner Set (full) - level = about 0.3sNear Empty Toner TONER LOW Low level>1sMixing Paddle does not rotate(ìCHANGE DRUMî)CHANGE DRUM High level fix or Low level fix