HP 8550 Service Manual - Page 8

Figure 36. Figure 37. Figure 38. Figure 39. Figure 40. Figure 41. Figure 42. Figure 43. Figure 44. Figure 45. Figure 46. Figure 47. Figure 48. Figure 49. Figure 50. Figure 51. Figure 52. Figure 53. Figure 54. Figure 55. Figure 56. Figure 57. Figure 58. Figure 59. Figure 60. Figure 61. Figure 62. Figure 63. Figure 64. Figure 65. Figure 66. Figure 67. Figure 68. Figure 69. Figure 70. Figure 71. Figure 72. Figure 73. Figure 74. Figure 75. Figure 76. Testing the ADF adjustment 143 Rear view of the ADF 144 Adjusting screw 144 DSW1 on the DADF controller PCB 145 Testing adjustment 146 Adjusting ADF document tray 146 DSW1 on DADF controller PCB 147 Measuring the copy paper stop position 148 DSW1 on DADF controller PCB 149 Positioning paper 150 Retaining plate adjustment 151 Measuring the distance from the copyboard glass to the ADF 151 Preparing test strips for measuring feeding power . 152 DADF controller cover 152 DSW1 on DADF controller PCB 153 Measuring feeding power 153 Lock nut glued in place 154 ADF sensors 155 LED 1 and 2 on DADF controller PCB 156 DADF controller PCB 157 Wing nuts on the adjustment screws 159 Base plate securing screws 160 Paper guide fixing screws 161 Paper guides 161 Paper size card 162 Copyboard glass 165 Copyboard cover 165 Belt assembly 168 Document tray 168 Sensors 169 Sensor S1 169 Reflecting face sensor 170 Registration sensor 170 Guide plate 171 Registration sensor 171 Registration sensor LED3 cover 172 Light-emitting face 172 Separation guide 173 Control panel power soft switch, copy module rear power switch, and power plug 177 Copy module 178 Electrical circuitry 179 6 Figures EN