Figure 5-20. Laser/scanner unit .........................................................................................139 Figure 5-21. Laser control block diagram ..........................................................................141 Figure 5-22. Image mask control .......................................................................................143 Figure 5-23. Scanner motor control ...................................................................................144 Figure 5-24. Image formation system ................................................................................146 Figure 5-25.
Image formation system (signal paths) .........................................................147 Figure 5-26. Print process diagram ...................................................................................149 Figure 5-27. Electrostatic latent image formation ..............................................................150 Figure 5-28. Primary charging ...........................................................................................150 Figure 5-29. Laser beam exposure ...................................................................................151 Figure 5-30.
Image development .......................................................................................152 Figure 5-31. Potential difference between the developing cylinder and the exposed area ...............................................................................................................152 Figure 5-32. Primary transfer .............................................................................................153 Figure 5-33. Secondary transfer ........................................................................................153 Figure 5-34.
Separation .....................................................................................................154 Figure 5-35. Fusing ............................................................................................................155 Figure 5-36. ITB cleaning ..................................................................................................155 Figure 5-37. Drum cleaning ...............................................................................................156 Figure 5-38. Cartridge diagram .........................................................................................157 Figure 5-39.
Developing engaging/disengaging unit .........................................................159 Figure 5-40. Memory tag control .......................................................................................160 Figure 5-41. Cartridge presence detection ........................................................................161 Figure 5-42. Toner level detection .....................................................................................162 Figure 5-43. Transfer section diagram ..............................................................................164 Figure 5-44.
Transfer section ............................................................................................166 Figure 5-45. ITB cleaning control ......................................................................................167 Figure 5-46. Waste toner full detection .............................................................................168 Figure 5-47. Transfer unit detection ..................................................................................169 Figure 5-48. Transfer unit life detection control .................................................................169 Figure 5-49.
ITB self-aligning mechanism .........................................................................171 Figure 5-50. Primary transfer roller engaging/disengaging control ...................................172 Figure 5-51. Secondary transfer roller engaging/disengaging control ..............................173 Figure 5-52. Secondary transfer roller engaging/disengaging detection ..........................174 Figure 5-53. Color misregistration control .........................................................................176 Figure 5-54. Color misregistration detection .....................................................................177 Figure 5-55.
Image stabilization control ............................................................................178 Figure 5-56. Image density detection ................................................................................180 Figure 5-57. Pickup/feed system .......................................................................................183 Figure 5-58. Pickup/feed system blocks ............................................................................184 Figure 5-59. Pickup/delivery unit block ..............................................................................186 Figure 5-60.
Skew control mechanism ..............................................................................188 Figure 5-61. Media detection .............................................................................................189 Figure 5-62. Fuser/delivery unit .........................................................................................191 Figure 5-63. Duplexing unit ...............................................................................................193 Figure 5-64. Reverse control .............................................................................................194 Figure 5-65.
Paper feeder .................................................................................................197 Figure 5-66. Paper feeder PCB signal flow .......................................................................198 Figure 5-67. Pickup/delivery sequence .............................................................................199 Figure 6-1. Phillips and Posidrive screwdriver comparison .............................................205 Figure 6-2. Cover locations .............................................................................................209 Figure 6-3.
Front door removal (1 of 2) ...........................................................................210 Figure 6-4. Front door removal (2 of 2) ...........................................................................210 Figure 6-5. Left cover removal .........................................................................................211 Figure 6-6. Left front cover removal (1 of 3) ....................................................................211 Figure 6-7. Left front cover removal (2 of 4) ....................................................................212 xviii ENWW