| 摘要 |
A medium processor for processing a medium has a path for transporting the medium; a display for displaying a processing status of the medium; a sensor for sensing the medium on the path, the sensor including a light-emitting device for emitting light and a photosensitive device for receiving the light; and a controller for controlling the operation of the processor. The controller has a light amount detector for detecting the amount of the light the photosensitive device receives; a comparator for comparing the amount of the light with a predetermined reference value; a light amount adjuster for adjusting the amount of electric power to adjust the amount of electric power in steps; a cleaning determiner for determining that the sensor needs to be serviced under a certain condition; and a display controller for controlling the display to display an indication of the sensor to be serviced. |
