HP — HP Scanjet N9120 Service Manual (EN)

Control-panel buttons ...................................................................................... 234 Control-panel buttons diagnostics .................................................. 234 Locked control-panel buttons ......................................................... 234 Troubleshooting diagnostic software ................................................................................................ 235 Main screen ..................................................................................................................... 235 Scan dialog box ...............................................................................................

237 Sensor check dialog box ................................................................................. 239 Control panel check dialog box ....................................................................... 244 ADF feed test dialog box ................................................................................. 246 Actuators dialog box ........................................................................................ 248 NVRAM dialog box .......................................................................................... 251 Update dialog box ...........................................................................................

253 Repair menu .................................................................................................... 254 Version information dialog box ........................................................................ 255 Diagrams ......................................................................................................................... 256 Component locator diagrams .......................................................................... 256 Major components .......................................................................... 256 ADF motors and fans ......................................................................

258 Printed circuit assemblies ............................................................... 260 Image-quality troubleshooting tools ................................................................................. 262 Repetitive-image-defect ruler .......................................................................... 262 Computer-display error messages ................................................................................................... 263 Computer-display error messages ...................................................................................

263 Solve paper-handling problems ........................................................................................................ 267 Jams ................................................................................................................................ 267 Common causes of jams ................................................................................. 267 Solve common ADF jams ................................................................................ 268 Clear jams from the ADF .................................................................................

269 The bottom of the scanned image is cut off ..................................................................... 272 Scan extra long documents ............................................................................. 272 Disable misfeed (multipick) detection .............................................................................. 272 ADF does not feed paper ................................................................................................. 273 Solve image-quality problems ..........................................................................................................

274 Image defects .................................................................................................................. 274 Set the background color for scans from the ADF ........................................................... 276 Filter out color from a document (color dropout) .............................................................. 277 Solve performance problems ........................................................................................................... 278 Solve connectivity problems .............................................................................................................

281 Solve direct-connect problems ........................................................................................ 281 7 Parts and diagrams Ordering parts and supplies ............................................................................................................. 284 Service part numbers ....................................................................................................................... 285 ENWW vii