HP 8550 Service Manual - Page 9

Figure 77. Inputs to and outputs from the reader controller PCB (1 of 3 180 Figure 78. Inputs and outputs from the reader controller PCB (2 of 3 181 Figure 79. Inputs and outputs from the reader controller PCB (3 of 3 182 Figure 80. Basic sequence of operations at power-on 183 Figure 81. A4- and letter-size, 2 copies, 4-color, Direct, and cassette 1 sequence of operations (1 of 2 185 Figure 82. A4- and letter-size, 2 copies, 4-color, Direct, and cassette 1 sequence of operations (2 of 2 186 Figure 83. Cross-section of exposure system 188 Figure 84. Exposure system mechanics 188 Figure 85. A4- and letter-size, 2 copies, 4-color, Direct, cassette 1 sequence of operations 189 Figure 86. Scanner movement 190 Figure 87. Scanner motor circuit 191 Figure 88. Changing the reproduction ratio 192 Figure 89. Controlling the scanning lamp 193 Figure 90. Paper selection sensors 197 Figure 91. Sensor operation 198 Figure 92. Image processing unit 200 Figure 93. CCD lines and filters 201 Figure 94. CCD circuit 202 Figure 95. Analog circuit 203 Figure 96. G image signal 205 Figure 97. Digital image processing 207 Figure 98. Scanning lamp and lens 208 Figure 99. Shading correction measurement 209 Figure 100. CCD position matching 210 Figure 101. Text identification 211 Figure 102. Sensor color correction measurement 212 Figure 103. Background pixel measurement 213 Figure 104. Input level 215 Figure 105. Weak and strong sharpness 215 Figure 106. Original density compared to CCD output 216 Figure 107. Density level conversion 216 Figure 108. BGR and YMC levels 217 Figure 109. BGR to YMC conversion 218 Figure 110. Gray components 219 Figure 111. Bk signal 220 Figure 112. UCR amount 220 Figure 113. Chromatic absorption characteristics 221 Figure 114. Enlargement/correction 223 EN Figures 7