Epson 4000 Service Manual - Page 149
DOT MISSING DETECTION, Dot Missing Detection Pattern, AUTOMATIC UNI-D ADJUSTMENT,
UPC - 010343848337
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EPSON Stylus Pro 4000 Revision B DOT MISSING DETECTION A pattern for dot missing detection is printed and dot missing is detected by scanning the pattern. The pattern is printed by all the nozzles, with 1 nozzle printing 1 block, and a block for a abnormal nozzle will not print. If dot missing is detected, the printer will execute cleaning automatically. #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 #15 #16 #17 #18 #19 #20 #21 #22 #23 #24 #25 #26 #27 #28 #29 #30 #31 #32 #33 #34 #35 #36 #37 #38 #39 #40 #41 #42 #43 #44 #45 #46 #47 #48 #49 #50 #51 #52 #53 #54 #55 #56 #57 #58 #59 #60 #61 #62 #63 #64 #65 #66 #67 #68 #69 #70 #71 #72 #73 #74 #75 #76 #77 #78 #79 #80 #81 #82 #83 #84 #85 #86 #87 #88 #89 #90 #91 #92 #93 #94 #95 #96 #97 #98 #99 #100 #101 #102 #103 #104 #105 #106 #107 #108 #109 #110 #111 #112 #113 #114 #115 #116 #117 #118 #119 #120 #121 #122 #123 #124 #125 #126 #127 #128 #129 #130 #131 #132 #133 #134 #135 #136 #137 #138 #139 #140 #141 #142 #143 #144 #145 #146 #147 #148 #149 #150 #151 #152 #153 #154 #155 #156 #157 #158 #159 #160 #161 #162 #163 #164 #165 #166 #167 #168 #169 #170 #171 #172 #173 #174 #175 #176 #177 #178 #179 #180 18 dot / (18/360 inch) 28 dot / (28/360 inch) AUTOMATIC UNI-D ADJUSTMENT A pattern for adjustment is printed, the pattern is scanned and acceptable values are calculated from the collected values, and then adjustment is automatically executed. The pattern first prints the matte black vertical line row (standard lines) and then prints an overlapping vertical line row in a different color (adjustment lines) that has been shifted by 1/1440 block unit in the main scan direction. If the standard lines and adjustment lines overlap, the collected A/D value (light quantity) becomes higher because the width detecting the paper is wide. The location detected with the most raised A/D values is determined to be the acceptable level of Uni-D alignment. Standard lines Adjustment lines (Matte Black) A/D Value Most A/D values are high = Uni-D acceptable O.K. Pattern N.G. Pattern Figure 2-54. Dot Missing Detection Pattern Scan Position Figure 2-55. Automatic Uni-D Adjustment Operating Principles Printer Mechanism Components 149