Chapter 77-23F-7-277.3.8 ARCDAT Control 0013-8492Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iRC2550The machine performs abridged D-half control to attain ideal gradation characteristics and to reduce downtime (by the main controller).1. Start-Up Timing- when the power is turned on- during post-rotation executed every 25 prints (*1)- during return from sleep*1: When printing an original with an image ratio of 25% or less.2. Particulars of ControlIn the presence of a specific condition, the DC controller forms a patch pattern of each color (Y, M, C, Bk) on the ITB (a single pattern for each color, a total of 4patterns). Thereafter, the DC controller measures the patch pattern using the patch image sensor (UN14), and sends the result back to the main controller, which inturn compares it against the abridged D-half reference data backed up in memory and uses the difference as the offset value for D-half.Density data (INT) outputUN16Video controllerDC controllerReference patch patterncreation for ARCDATPatch readingStart-upData storage(as reference data forARCDAT)Data output(D-CON)Density data(D-CON)10040 100204010INTDC controller
