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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
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