HP Color 9850mfp Service Manual - Page 89

II UNIT EXPLANATION hp Color 9850mfp WRITE A. Types of the color registration correction control There are following, 5 color registration correction controls. The write units are mechanically adjusted in the "Partial horizontal magnification"; however, the correction is performed automatically in the other four. Correction type Drift in the main scan direction Drift in the subscan direction Entire horizontal magnification Inclination Correction method Adjusts the write start timing in the main scan direction Adjusts the write start timing in the sub-scan direction Adjusts the clock frequency at write Adjusts the angle of the cylindrical lens 2 Partial horizontal magnification Adjusts the position of the write unit (parallelism against drum) * See adjusting the timing for the image adjustment in 36 mode *1 The relationship between 2 colors are shown in the interests of simplicity. *2 In "drift in the main scan direction", "Entire horizontal magnification", and "Partial horizontal magnifica- tion", colors are intentionally drifted in the sub-scan direction to make it clear the drift between 2 colors. 2-15