Oki C3400n Maintenance Manual page 30

Toner Sensor Detection Principle
Detection of the low toner is performed by the toner sensor (light reception sensor) installed inside
the equipment and the luminous LED installed inside the cartridge. The shading board is installed
inside the ID and rotates synchronizing with the toner stir. A shutter is attached to the ID. The
shutter synchronizes with the cartridge operation lever and the toner sensor can detect whether
the cartridge is installed properly. If the toner sensor is stained by the toner, etc., or the ID unit and
the toner sensor are not facing each other as specified due to improper setting of the ID unit or for
other reason, the detection may not be executed normally, resulting in a toner sensor error.
Toner sensor
(light reception sensor)
Toner Counter Principle
After the image data is developed into 2 value data to enable printing using the printer, the print
dot number is counted by the LSI. The amount of the toner used is counted from the above count
value and the remaining amount is displayed. On the other hand, detection of the low toner by the
toner sensor is physically made when the amount of the toner remaining in the cartridge comes
to be under certain amount.
Principles of ID, Belt and Fusing Counter
ID Counter
Belt Counter
Fusing Counter : Standard is the length of Legal 13 inches sheet of paper. 1 count is the sheet of
43163501TH Rev. 1
Toner cartridge lever
Luminous LED
Shading board
: 1 count is the value of one third of the amount of drum rotation when three A4
sheets of paper are continuously printed.
: 1 count is one third of the amount of the belt rotation when three A4 sheets of
paper are continuously printed.
paper under that length and when the length is more than that, the number of
count is decided by multiples of Legal 13 inches.(Number under the decimal
point is rounded up.)
Oki Data CONFIDENTIAL
Toner stir
Shutter
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