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夏普SHARP MX-2318UC代码： F2-40 说明：墨粉浓度传感器故障（K）原因：墨粉浓度传感器的输出异常，传感器连接器线束及连接问题。显影组件故障，PCU PWB的故障）。措施：更换墨粉浓度传感器，检查传感器连接器和线束的连接，更换显影组件，更换PCU板。夏普SHARP MX-2318UCCode F2-40 Description Toner density sensor trouble (K) Causes Toner density sensor output abnormality. Sensor connector and harness connection trouble. Developing unit trouble. PCU PWB trouble. Remedy Replace the toner density sensor. Check connection of the sensor connector and the harness. Replace the developing unit. Replace the PCU PWB. 如果满意望及时采纳：点击我的回答右边的"采纳答案"按钮, ~答题不易，予人玫瑰，手有余香。仍有问题请再追问，Thanks