Tektronix PHASER 560 Service Manual page 101

5
Theory of Operation
The toner cartridges
Four toner cartridges, black, yellow, cyan and magenta, contain the primary
color toners. Each toner cartridge feature a voltage-biased developer that
sequentially transfers that cartridge's toner onto imaging unit's photoconductive
belt depending on where the laser exposed the belt. Subsequently, the toner is
transferred to the imaging unit's accumulator belt from which it is transferred to
a sheet of media.
The fuser
The fuser permanently bonds the toners to the media through a combination of
heat and pressure.
The engine control board
Working as the "brains" of the print engine, the engine control board coordinates
all printer functions. It contains the microprocessor and ROM that control
printer operations.
The power supplies
The low-voltage power supply provides regulated DC power source for the
printer's electronics, motors. The high-voltage power supply provides
high-voltage for the chargers and bias rollers.
The mechanicals
Mechanicals include the motors, gear trains and solenoids that drive the belts
and rollers of the printer.
The image processor board
The image processor board converts the image data from the host computer into
a raster format for the print engine. The image process or board also controls all
messages displayed on the front panel.
5-3
Service Manual
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