Oki C3200n, Service Manual

Page: 39 / 262

42615101TH Rev.8
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Oki Data CONFIDENTIAL
Principle of Detection by Toner Sensors
Movements of that sensor lever of a toner cartridge which is powered by an image drum (ID) motor
are read by a toner sensor for detecting that the cartridge is low on toner. The lever moves
concurrently with movement of a mixing bar placed in the cartridge. With the lever, or the sensor,
contaminated with toner etc., or the cartridge not facing the sensor properly due to improper ID unit
or toner cartridge installation, the sensor may not properly detect the cartridge being low on toner,
causing a toner sensor error.
Sensor Lever
Toner Sensor
Side Plate
Toner Cartridge
Principle of the toner counter
After image data is developed to binary data which is printable, Dot counter counts the data as print
dots in LSI. Calculate the amount of the used toner with this count value to display a remaining
amount. Meanwhile, the toner LOW detection by the toner sensor has a function that Toner LOW
is detected when toner quantity in side of the toner cartridge is under a certain amount physically.
Principle of ID, Belt andFuser counter
ID counter : One third of the amount of drum rotation when three sheets of A4 paper is
printed continuously is regarded as one count.
Belt counter : One third of the amount of belt rotation when three sheets of A4 paper is printed
continuously is regarded as one count.
Fuser counter: On the basis of paper length of Leagal 13 inch, if it is 13 inch or less, it is
regarded as 1 count. If it is over 13 inch , the number of counters is determined
by multiples of Leagal 13 inch.(Round off to an integer value)