What kind of paper do you use? do you see this effect in light paper also? Most of the times the color background is a drum issue. The bigger the temperature, the more you will see this effect. There is a setting in the printer's menu, it's call BG Setting. Print the configuration menu to find it.It reduces or increases the background toning. Try this.
In photoshop or MS word just increase the contrast of the image and all dirty gray background will disappear and if u need our technician support contact http://tinyurl.com/mtgjzz
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