HP LaserJet 9040/9050 Service Manual - Page 319

D dark pages, troubleshooting 236, 240 dark setting, toner density 45 data communication operations 81 Data light, locating 30 data transmission settings 48 date, setting 46 DC controller cartridge memory failures, detection 86 diagrams and part numbers 283 formatter operations 81 media-size detection 87 operations 76 part numbers 257 removing 138 tray 1 feeding operations 93 troubleshooting 174 voltage 80 DC voltage, conversion 80 declaration of conformity 13 default settings restoring 53, 217, 219 selecting 31, 33 defect ruler 243 defect tables 235 delay jams tray 1 94 tray 2 or 3 88 tray 4 96 delivery assembly diagrams and part numbers 281 fans, removing 114, 115 removing 113 delivery motor, removing 116 density settings 45 depth, printer space requirements 17 specifications 7 developing bias generation 79 developing cylinder, operations 84 developing process, image formation operations 84 diagnostics communications 246 drum rotation 220 engine 174, 215 flowchart 216 high-voltage power supply 220 LAN 247 loopback 247, 249 paper path 213 ping 248 print cartridges 234 service test 213 tray 4 221 troubleshooting, preliminary 170 Diagnostics menu 54 different media for first page, troubleshooting 172 digital camera memory cards 82 DIMMs error messages 206 installed personalities and options 228 part numbers 258 DIP switches, tray 4 223 directory, file 38, 232 disks. See hard disks distorted images, troubleshooting 238 diverter, left door 107, 264 DLC/LLC settings 51 documentation, part numbers 259 door open jams 88 DOOR OPEN sequence of operations 73 doors, removing left 107, 264 right 105 DOS prompt, communications test 246 dots per inch (dpi) features 2, 4 settings 44 dots, vertical 242 double-sided printing 42 Down arrow, control panel 31 dpi (dots per inch) features 2, 4 settings 44 draft printing 45, 68 drive assembly (tray 4), removing 158 drive motor (tray 4), removing 157 drivers, changing settings from 36 dropouts, troubleshooting 238 drum bias generation 79 cleaning process, image formation operations 85 feed drive assembly, diagrams and part numbers 274 ground path, troubleshooting 239 image defects, troubleshooting 234 image formation operations 84 rotation check 220 drum motor (DCM2) block diagram 92 removing 141 duplexer communications 77, 228 failure, error messages 211 Install guide 259 jams, error messages 191, 197, 202 locating 10, 12 models including 2, 6 paper sizes supported 27 part number 259 removing 133 settings 42 troubleshooting 244 duty cycle 3, 5 E EconoMode 45, 68 edge-to-edge printing 42 EEPROM operations 77 EIO cards critical error messages 212 slots 81 supported 3, 5 EIO menu 49 electrical specifications 7 electrostatic discharge (ESD), precautions for 99 embedded LAN disabling 248 formatter replacement 250 ping test 248 troubleshooting 247, 249 embossed media, specifications 22 engine control system block diagram 75 formatter operations 81 engine test performing 215 troubleshooting 174 Index Index303