The waste toner transferred from the lower waste toner path falls into the waste toner bottle [C] via the toner collection transfer coil [A] and the collection bottle transfer coil [B]. The toner collection transfer coil [A] and the collection bottle transfer coil [B] are driven by the waste toner transport motor [E] via gears.
When the torque of the toner collection transfer coil [A] or the collection bottle transfer coil [B] increase, the torque limiter slips. Then the waste toner bottle motor sensor [D] detects the torque increase and the machine stops the waste toner transport motor [E]. The machine displays on the operation panel that the waste toner bottle is full. After removing/installing the waste toner bottle while the main power is on, the machine displays SC486 (Bottle Waste Toner Lock Detection Error) on the operation panel if the waste toner bottle motor sensor [D] detects the torque increase again while the waste toner bottle motor is driving.