Brother International HL-2400C Service Manual - Page 52

(5) Control System The control system consists of the following 4 (four) control parts and runs the printer by processing the interface signals transmitted from the Host computer and interfacing to the print, transfer, scanning and transport systems. • Sequence Control • Laser Control • Fusing Temperature Control • Interface Control (1) Principle of Color Printing Color printing is made through the subtractive process by combining the three primary colors, yellow, magenta, and cyan. Fig.4-2 shows the three primary colors and subtractive process: C BL GR BK M R Y Y: Yellow M: Magenta C: Cyan R: Red GR: Green BL: Blue BK: Black Fig.4-2 (2) Basic Color Printing Process (a) The printer has a Toner Cartridge of each color yellow, magenta, cyan and black as shown in Fig.4-3. (b) The toner image developed using the primary colors is transferred to the transfer drum for the printed color combination as shown in Fig.4-4 a . (c) The toner image formed on the transfer drum is transferred to the transported paper as shown in Fig.4-4 b . (d) The toner on the paper is fused by the thermal fixing unit to fix the toner image onto the paper as shown in Fig.4-4 c . Summarizing the above processes, a toner color layer is formed on the transported paper, and subsequently, the color image is made through the subtractive process. IV-3