Oki C911 Maintenance Manual page 28

Oki Data CONFIDENTIAL
Process of the toner sensor detection
Toner LOW is detected by the toner sensor (optical sensor) arranged in the printer. The
douser is mounted inside the ID and rotates in synchronization with toner agitation.
Detection may not take arrange normally, and a toner sensor error may be issued, if the
douser or toner sensor is soiled with toner, or if the ID unit and toner sensor do not set
exactly corresponding to each other in their positions.
Principle of the counter for toner
After image data is developed to binary data that the printer can print, the LSI counts the
data as a number of printing dots. The amount of toner consumed is calculated from that
count value, and the remaining amount of toner is thus indicated. In contrast, the toner LOW
detection (the display of the remaining amount on LCD) by the toner sensor is implemented
when the toner amount remaining inside the ID unit physically decreases to below a certain
level.
45530603TH Rev.2
Principles of counters for Image Drum, Belt Unit, and
Fuser Unit
ID counter: One count represents the value that results from dividing the amount of rotation
of the drum by three when three A4-size sheets (in Long Edge Feed) are
printed in continuous printing.
Belt counter: One count represents the value that results from dividing the amount of rotation
of the belt by three when three A4-size sheets (in Long Edge Feed) are printed
in continuous printing.
Fuser counter: 1. One count is registered when the printing paper is shorter than 297mm (same
as A4 longedge size)
2. Two count is registered when the printing paper is shorter than A3-nobi. In
the case of the printing paper's length as between from A4-Long_Edge to A3-
nobi, the count is registered by to calculate with proportionally.
3. In the case of the Banner sheet that is longer than A3-nobi (max. 1200mm),
the count is registered by calculating proportionally in increments of 375mm.
(Refer the following table)
As for Fuser unit, the counter value is increased by the following table for one sheet of each papers.
Paper Size Paper Lenghth
A4(LEF)
A4(SEF)
Legal13"
Legal14"
B4
A3
tabloid
A3nobi
Banner
2. DESCRIPTION OF OPERATION
Counter Value
90 1
210 1
294 1
330 1.23
330 1.23
356 1.39
364 1.44
420 1.79
431 1.86
453 2
600 2.39
660 2.55
660 2.55
900 3.19
990 3.43
990 3.43
1203 4
1320 4.31
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