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Brother HL-L9300CDWTT Manual

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Appendix
215
A
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
A
The number of developer roller rotations that are counted may not only be for normal operations such as
printing, 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 device. When calibration occurs, 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 printer senses 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 device, 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 (i.e., 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.
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