Toshiba e-STUDIO2008A Service Manual page 373

5.18 Pixel counter
5.18.1 Outline
[ 1 ] Outline
Pixel counter is a function that counts the number of dots emitted by laser and converts it into the print
ratio (%) per standard paper size. This "Print ratio (%) per standard paper size" is called Pixel count
(%).
This function enables you to know how each user uses the equipment and to grasp the tendency of
toner consumption (number of output pages per cartridge).
However, its accuracy is not sufficient for it to be used to determine the actual toner consumption. This
is because, some of the factors in "2" below are not taken into account by the pixel counter.
[ 2 ] Factors affecting toner consumption
Standard number of output pages per cartridge shows the average number of output pages under the
condition that the data of print ratio 6% is printed on the standard paper size (A4/LT) at a normal
temperature and humidity.
However, users do not always print under the above condition. As for the type of original, copy/print
mode and environment, each user has different tendency, and as a result, the number of output pages
per cartridge becomes different depending on the user.
The major factors affecting toner consumption are as follows:
• Original/Data coverage
• Original/Data density
• Original/Print mode
• Density setting
• Print Pattern
Character images (e.g. Text) consume more toner than solid images even though they may have the
same density. This is due to the "edge effect".
• Number of pages per job
Toner consumption testing is made in the "continuous running mode". More toner is required when
printing in the non-continuous running mode.
• Number of image quality control
Image quality control is performed automatically when the device is switched on, when it returns
from sleep mode, and also during continuous running. Toner consumption may vary depending on
the number of image quality adjustments performed during operation.
• Paper
The size, feeding direction and type of paper influence toner consumption.
• Environmental conditions
Temperature and Humidity affect toner consumption.
• Others
In addition to the above, there are other factors that may influence toner consumption. These
include variations between individual products, life of consumable, bias voltages, Drum surface
potential, etc.
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