Xerox 7700DX Service Manual - Page 154

Registration Control (RegiCon) Adjustment Overview The DC685 RegiCon tests are the means by which registration is accomplished. Registration means establishing the alignment of the four primary colors with regard to horizontal and vertical positioning, tilt or skew, length of lines and linearity. When the registration process is completed, all color planes are positioned properly. Note For any registration procedure to succeed, the printer must print with no image defects. Verify by printing color solid fill pages, see "Print Color Test Prints" on page 9-289. To resolve a print image problem, see "Print Image Quality Problems" on page 3-108. The printer registration process consists of the Belt Edge Learn, Coarse Skew Adjustment, Fine Skew Adjustment, In/Out Skew Adjustment, and Center Skew Adjustment, with each test reporting success. On failure of any of Skew Adjustment, the Coarse RegiCon Initialization must be performed. Coarse RegiCon Initialization Coarse RegiCon Initialization is the procedure by which the printer aligns the magenta, yellow and black vertical and horizontal scan lines to the cyan reference scan line. Horizontal and vertical alignment ensures that the magenta, yellow and black lines are superimposed on Cyan. Figure 1: Horizontal and Vertical Margins M, Y, K Cyan Figure 4-1 Coarse RegiCon Initialization S7700-460 Note Cyan is the reference color to which all other colors are aligned. 4-124 Phaser 7700 Color Laser Printer Service Manual