Oki Okipage4w Service Manual page 37

(d) After the image drum unit has been replaced (after the drum counter has been reset), Toner Low is
not detected until drum counter indicates 100.
(2) The basic rotation cycle of the toner sensor is as follows:
Basic rotation cycle of toner sensor
Toner low time
Toner full time
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T time
4.9 sec.
t1> 1.2 sec.
1.2 sec. > t1>