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Home > Appendix > Important Information About Toner Cartridge Life
Important Information About Toner Cartridge Life
Toner Cartridge Life
This product detects the life of the toner cartridges using the following two methods:
Detection by counting the dots of each colour that are necessary to create an image
Detection by counting the rotations of the developer roller
This product has a function that will count the dots of each colour used to print every document and the rotations
of each toner cartridge’s developer roller. The print operation will stop when either of the upper limits is reached.
The upper limit is set above the number of dots or rotations that would be required for the cartridge to perform
consistently with its advertised page yield. This function is intended to reduce the risk of poor print quality and
damage to the machine.
There are two messages that indicate when the toner is low or needs replacing: Toner Low and Replace Toner.
Toner Low is displayed on the LCD when the number of dots or rotations of the developer roller nears its
maximum count: Replace Toner is displayed on the LCD when the number of dots or rotations of the developer
roller reaches its maximum count.
Colour Correction
The number of developer roller rotations that are counted may not only be for normal operations, such as printing
and copying, but also for machine adjustments, such as Colour Calibration and Colour Registration.
Colour Calibration (Adjustment of Colour Density)
To obtain stable print quality, the density of each toner cartridge needs to be maintained at a fixed value. If the
density balance between the colours cannot be kept, the tint becomes unstable, and accurate colour
reproduction becomes unavailable. The toner density can change due to chemical changes to the toner that
affect its electrical charge, deterioration of the developer unit, and temperature and humidity levels in the
machine. During calibration, the density level adjustment test patterns are printed on the belt unit.
Calibration is mainly performed at the following times:
When the user manually selects calibration from the operation panel or the printer driver.
(Please perform calibration if colour density needs to be improved.)
When a used toner cartridge is replaced with a new one.
When the machine detects that the ambient temperature and humidity have changed.
When a specified number of printed pages is reached.
Colour Registration (Correction of Colour Position)
In this machine, the drum unit and developer unit are prepared for black (K), yellow (Y), magenta (M), and cyan
(C), respectively. Four colour images are combined into one image, and therefore colour registration errors (for
example, how the four colour images align) might occur. When registration errors occur, registration correction
test patterns are printed on the belt unit.
Registration is mainly performed at the following times:
When the user manually selects registration from the operation panel.
(Please perform registration if a colour registration error needs to be corrected.)
When a specified number of printed pages is reached.
Related Information
Appendix
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Brother MFC-L3770CDW Installation Guide - English - 2 pages

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Brother MFC-L3770CDW Quick start guide - German - 20 pages

Brother MFC-L3770CDW User Manual - German - 698 pages

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Brother MFC-L3770CDW Quick start guide - Dutch - 20 pages

Brother MFC-L3770CDW User Manual - Dutch - 695 pages

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