Oki 4M - Manual (Page 35)

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(2) The basic rotation cycle of the toner sensor is as follows:
2.8 Cover Open
Opening the stacker cover turns off the microswitch on the high-voltage power supply board to
suspend +5 V supply to the high voltage power supply. This results in the stop of all high-voltage
outputs. At the same time, the CVOPN signal is issued to notify the main control board of the
switch status and cover open processing is executed.
Basic rotation cycle of toner sensor
T time
4.9 sec.
t1 > 1.2 sec.
1.2 sec. > t1 > 0.28 sec.
Toner low time
Toner full time