HP 4550 Service Manual - Page 10

HP Color LaserJet 4500 and HP Color LaserJet 4550 printers .. 174 - color laserjet drum

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Figure 5-34 Side registration adjustment 130 Figure 5-35 Duplex feed roller pressure 130 Figure 5-36 DC controller PCB 132 Figure 5-37 Motors and fans 133 Figure 6-1 Phillips and Posidriv screwdriver comparison 140 Figure 6-2 Top cover removal and replacement (rear view of printer 144 Figure 6-3 Left side cover removal and replacement 145 Figure 6-4 Right side cover removal and replacement 146 Figure 6-5 Rear door removal and replacement 147 Figure 6-6 Right rear cover removal and replacement 148 Figure 6-7 Drum drawer (top drawer) cover removal and replacement 149 Figure 6-8 Drum drawer (top drawer) cover tabs and levers 150 Figure 6-9 ITB drawer (middle drawer) cover removal and replacement 151 Figure 6-10 ITB drawer (middle drawer) removal and replacement 152 Figure 6-11 Control panel removal and replacement 153 Figure 6-12 Front right cover removal and replacement 155 Figure 6-13 RFI shield removal and replacement 156 Figure 6-14 Laser/scanner assembly removal and replacement 157 Figure 6-15 DC controller removal and replacement 158 Figure 6-16 Developing PCB removal and replacement (1 of 2 159 Figure 6-17 Developing PCB removal and replacement (2 of 2 160 Figure 6-18 Top cover switch assembly removal and replacement 162 Figure 6-19 Top cover switch assembly removal and replacement 162 Figure 6-20 Drum drawer (top drawer) switch 163 Figure 6-21 Drum drawer (top drawer) assembly removal and replacement (1 of 3 164 Figure 6-22 Drum drawer (top drawer) assembly removal and replacement (2 of 3 165 Figure 6-23 Drum drawer assembly removal and replacement (3 of 3 165 Figure 6-24 Densitometer removal and replacement (1 of 2 166 Figure 6-25 Densitometer removal and replacement (2 of 2 167 Figure 6-26 Formatter removal and replacement 168 Figure 6-27 Formatter pan assembly removal and replacement (1 of 4 170 Figure 6-28 Formatter pan assembly removal and replacement (2 of 4 171 Figure 6-29 Formatter pan assembly removal and replacement (3 of 4 171 Figure 6-30 Formatter pan assembly removal and replacement (4 of 4 172 Figure 6-31 Power supply removal and replacement 173 Figure 6-32 High-voltage power supply removal and replacement (newer version HP Color LaserJet 4500 and HP Color LaserJet 4550 printers 174 Figure 6-33 High-voltage power supply removal and replacement (older version HP Color LaserJet 4500 printers 175 Figure 6-34 Drum drive assembly removal and replacement (1 of 3 176 Figure 6-35 Drum drive assembly removal and replacement (2 of 3 177 Figure 6-36 Drum drive assembly removal and replacement (3 of 3 177 Figure 6-37 Large fan removal and replacement (1 of 2 178 Figure 6-38 Large fan removal and replacement (2 of 2 178 Figure 6-39 Toner level sensor assembly removal and replacement 179 Figure 6-40 Carousel drive assembly removal and replacement (1 of 2 180 Figure 6-41 Carousel drive assembly removal and replacement (2 of 2 180 Figure 6-42 Paper size switch removal and replacement 181 Figure 6-43 Switch plate assembly removal and replacement 182 Figure 6-44 Paper feed PCB removal and replacement (1 of 3 183 Figure 6-45 Paper feed PCB removal and replacement (2 of 3 183 Figure 6-46 Paper feed PCB removal and replacement (3 of 3 184 Figure 6-47 Fuser motor removal and replacement (1 of 2 185 Figure 6-48 Fuser motor removal and replacement (2 of 2 186 Figure 6-49 Paper path motor removal and replacement 187 Figure 6-50 Paper pick solenoid removal and replacement 188 Figure 6-51 ITB cleaning roller clutch removal and replacement 189 Figure 6-52 ITB clutch assembly removal and replacement (1 of 2 190 Figure 6-53 ITB clutch assembly removal and replacement (2 of 2 190 viii

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viii
Figure
5-34 Side registration adjustment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Figure
5-35 Duplex feed roller pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Figure
5-36 DC controller PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Figure
5-37 Motors and fans
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Figure
6-1 Phillips and Posidriv screwdriver comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Figure
6-2 Top cover removal and replacement (rear view of printer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Figure
6-3 Left side cover removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Figure
6-4 Right side cover removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Figure
6-5 Rear door removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Figure
6-6 Right rear cover removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Figure
6-7 Drum drawer (top drawer) cover removal and replacement
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Figure
6-8 Drum drawer (top drawer) cover tabs and levers
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Figure
6-9 ITB drawer (middle drawer) cover removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Figure
6-10 ITB drawer (middle drawer) removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Figure
6-11 Control panel removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Figure
6-12 Front right cover removal and replacement
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Figure
6-13 RFI shield removal and replacement
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Figure
6-14 Laser/scanner assembly removal and replacement
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Figure
6-15 DC controller removal and replacement
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Figure
6-16 Developing PCB removal and replacement (1 of 2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Figure
6-17 Developing PCB removal and replacement (2 of 2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Figure
6-18 Top cover switch assembly removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Figure
6-19 Top cover switch assembly removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Figure
6-20 Drum drawer (top drawer) switch
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Figure
6-21 Drum drawer (top drawer) assembly removal and replacement (1 of 3) . . . . . . . . . . . . . . . . . . 164
Figure
6-22 Drum drawer (top drawer) assembly removal and replacement (2 of 3) . . . . . . . . . . . . . . . . . . 165
Figure
6-23 Drum drawer assembly removal and replacement (3 of 3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Figure
6-24 Densitometer removal and replacement (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Figure
6-25 Densitometer removal and replacement (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Figure
6-26 Formatter removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Figure
6-27 Formatter pan assembly removal and replacement (1 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Figure
6-28 Formatter pan assembly removal and replacement (2 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Figure
6-29 Formatter pan assembly removal and replacement (3 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Figure
6-30 Formatter pan assembly removal and replacement (4 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Figure
6-31 Power supply removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Figure
6-32 High-voltage power supply removal and replacement (newer version
HP Color LaserJet 4500 and HP Color LaserJet 4550 printers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Figure
6-33 High-voltage power supply removal and replacement (older version
HP Color LaserJet 4500 printers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Figure
6-34 Drum drive assembly removal and replacement (1 of 3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Figure
6-35 Drum drive assembly removal and replacement (2 of 3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Figure
6-36 Drum drive assembly removal and replacement (3 of 3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Figure
6-37 Large fan removal and replacement (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Figure
6-38 Large fan removal and replacement (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Figure
6-39 Toner level sensor assembly removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Figure
6-40 Carousel drive assembly removal and replacement (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Figure
6-41 Carousel drive assembly removal and replacement (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Figure
6-42 Paper size switch removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Figure
6-43 Switch plate assembly removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Figure
6-44 Paper feed PCB removal and replacement (1 of 3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Figure
6-45 Paper feed PCB removal and replacement (2 of 3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Figure
6-46 Paper feed PCB removal and replacement (3 of 3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Figure
6-47 Fuser motor removal and replacement (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Figure
6-48 Fuser motor removal and replacement (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Figure
6-49 Paper path motor removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Figure
6-50 Paper pick solenoid removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Figure
6-51 ITB cleaning roller clutch removal and replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Figure
6-52 ITB clutch assembly removal and replacement (1 of 2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Figure
6-53 ITB clutch assembly removal and replacement (2 of 2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190