HP 8550 Service Manual - Page 10

8 Figures Figure 115. Image shifts 224 Figure 116. Shift in main and sub-scanning directions 224 Figure 117. Center Shift 225 Figure 118. Mirror image 226 Figure 119. Mirror image principle 226 Figure 120. Image repeat 227 Figure 121. Image repeat principle 227 Figure 122. Slant 228 Figure 123. Slant principle 228 Figure 124. Curve for items A through D 229 Figure 125. Curve for black-and-white text mode 229 Figure 126. Framing 230 Figure 127. Blanking 230 Figure 128. Control panel 233 Figure 129. Copy module fan 234 Figure 130. Cooling fan engaged 234 Figure 131. Power 236 Figure 132. Copy module power distribution 237 Figure 133. Copy module general circuit diagram (1 of 2) . . . . 240 Figure 134. Copy module general circuit diagram (2 of 2) . . . . 242 Figure 135. ADF electrical circuitry 244 Figure 136. Operation mode communication 245 Figure 137. Inputs to the DADF controller PCB (1 of 2 246 Figure 138. Inputs to the DADF controller PCB (2 of 2 247 Figure 139. Outputs to the DADF controller PCB 248 Figure 140. ADF motors 249 Figure 141. Top pick-up path 251 Figure 142. Face-up (left) output tray 253 Figure 143. Face-down (top) output tray 254 Figure 144. Page composition copy sequences 255 Figure 145. Picking up originals 256 Figure 146. Pick-up path 257 Figure 147. Feeding sequence 258 Figure 148. Feeding 258 Figure 149. Second original pick-up 259 Figure 150. Sequence of operations (A4, 2 originals, top pick-up mode 260 Figure 151. Picking up for the first side 261 Figure 152. Reversing from the first side to the second side . . 261 Figure 153. Sequence of operations (reversal 262 Figure 154. Placement of first original 263 Figure 155. Positioning the first original and pick-up of second original 263 Figure 156. Movement of first and second originals 264 EN