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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
The third step (developing block) is where the toner image is developed on the drum by the developing section
(or supply chamber), which contains the toner particles. The toner is held to the magnetic roller sleeve by the stationary magnet
inside the sleeve, and a DC bias voltage supplied by the high voltage power supply. This DC bias voltage is controlled by the
printer's density setting, and causes either more or less toner to be attracted to the drum. This in turn will either increase or
decrease the print density. Both the primary charge roller's and magnetic roller's DC bias voltages are controlled by the printer's
density setting. The amount of toner on the magnetic roller sleeve is also controlled by the rubber doctor blade, which uses
pressure to keep the amount of toner on the magnetic roller sleeve constant. This blade also causes a static charge to build up
on the toner, which helps keep the coating of toner even and allows easy transfer to the OPC drum.
At the same time, an AC signal is also placed on the magnetic roller sleeve. This signal decreases the attraction of the toner to
the magnetic roller sleeve, and increases the repelling action of toner against the areas of the drum that was not exposed to the
laser beam. This AC potential improves the density, and contrast of the toner on the printed page.
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