HP 2820, 2830, 2840 6 Troubleshooting

Removing the fuser motor..................................................................................................	222
Removing the carousel-engagement motor.......................................................................	223
Removing the air duct and fan............................................................................................	223
Printed circuit assemblies (PCAs).......................................................................................................	225
Removing the sub-high-voltage transformer PCA..............................................................	225
Removing the high-voltage transformer PCA.....................................................................	226
Removing the low-voltage PCA..........................................................................................	226
Trays....................................................................................................................................................	229
Removing tray 1 (multipurpose tray)..................................................................................	229
Removing optional tray 2 (250-sheet tray).........................................................................	230
Removing the optional tray 2 pickup roller.........................................................................	233
Replacing the optional tray 2 separation pad.....................................................................	235
6 Troubleshooting
Support strategy..................................................................................................................................	238
Troubleshooting process.....................................................................................................................	239
Troubleshooting checklist...................................................................................................	239
Control-panel messages......................................................................................................................	244
Alert and warning messages..............................................................................................	244
Critical error messages.......................................................................................................	253
Clearing jams.......................................................................................................................................	256
Media jams occur in the device..........................................................................................	256
Tips to avoid media jams ..................................................................................	256
Where to look for jams.......................................................................................	256
To clear a media jam inside the device.............................................................	257
To clear output area jams..................................................................................	258
Media jams occur in the automatic document feeder (ADF)..............................................	260
To clear a media jam from the automatic document feeder (ADF) ..................	260
Print problems......................................................................................................................................	263
Print quality problems.........................................................................................................	263
Improving print quality........................................................................................	263
Understanding print-quality settings..................................................	263
To temporarily change print-quality settings.....................	263
To change print-quality settings for all future jobs............	263
Identifying and correcting print defects..............................................................	263
Print-quality checklist.........................................................................	264
General print quality issues...............................................................	265
Solving issues with color documents................................................	271
Media-handling problems...................................................................................................	272
Print-media guidelines........................................................................................	272
Solving print-media problems............................................................................	273
Performance problems.......................................................................................................	274
Scan problems.....................................................................................................................................	276
Solving scanned image problems.......................................................................................	276
Scan quality problems........................................................................................................	277
Preventing problems..........................................................................................	277
Solving scan-quality problems...........................................................................	278
Scan-specific error messages............................................................................................	279
Copy problems.....................................................................................................................................	280
Preventing problems...........................................................................................................	280

viii ENWW