German user manual with schematics
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Text excerpt from page 132 (click to view)
15-10. 3rd Drawer Paper Level Detecting Mechanism
â¢ The amount of paper still available for use, or the paper level, of the Main
Tray is detected using 3rd Drawer Elevator Motor Pulse Sensor PC44 and a pulse disk which detect the speed of 3rd Drawer Elevator Motor M27. â¢ The pulse disk is mounted on the shaft of the intermediary gear that transmits drive from M27. The speed of M27 is known by counting the number of pulses using PC44.
*Paper Level Indicator
When 3rd Drawer is Slid in Counting of the number of pulses is started when M27 is energized (to turn forward) and continues until PC16 is blocked ( L ). The total number of pulses is translated into the amount of paper which is shown on the Touch Panel as a graphic marker in units of 50 sheets of paper. During Copy Cycle As the paper is consumed and the top level of the paper stack lowers, M27 is energized (to turn forward) to raise the paper stack. During this time, PC44 detects pulses and that pulse count is accumulated. When the count reaches 50 sheets of paper, one segment of the paper level indicator on the Touch Panel goes out.
â¢ 1 to 50 sheets â¢ 50 to 200 sheets
â¢ 200 to 350 sheets
â¢ 350 to 500 sheets
â¢ 500 sheets up
3rd Drawer Elevator Motor Pulse Sensor PC44
NOTE : If there is paper on the Shift Tray, the 3rd Drawer copier detects that 500 sheets or Elevator Motor more of paper are left in the 3rd M27 Drawer as long as paper is left on the Main Tray.