Service manual

Conditions of jam detection.................................................................................58
Solenoid, sensors, switches, and motor..............................................................................58
Basic sequence of operation (formatter-to-printer)..............................................................60
5 Removal and replacement
Removal and replacement strategy......................................................................................................64
Required tools .....................................................................................................................64
Before performing service....................................................................................................64
Print cartridge .....................................................................................................................65
Differences between the HP LJ 1010 series printer models................................................66
Parts removal order ............................................................................................................67
User-replaceable parts ........................................................................................................................68
Replacing the pickup roller .................................................................................................68
Replacing the separation pad..............................................................................................71
Replacing the main input tray (paper-pickup tray assembly)...............................................73
Replacing the output-bin extension (delivery-tray assembly)..............................................74
Covers..................................................................................................................................................75
Right-side cover...................................................................................................................75
Left-side cover.....................................................................................................................77
Rear panel and top-cover assembly....................................................................................77
Front cover...........................................................................................................................82
Internal assemblies..............................................................................................................................84
Transfer-roller assembly......................................................................................................84
Engine-power assembly......................................................................................................87
Fuser (fixing) assembly........................................................................................................89
Paper-pickup assembly.......................................................................................................91
Engine control unit (ECU) assembly....................................................................................92
Laser/scanner assembly......................................................................................................96
6 Troubleshooting
Basic troubleshooting...........................................................................................................................98
Troubleshooting checklist....................................................................................................98
Control-panel power-on functions (HP LaserJet 1010 series printers)...............................................100
Control-panel pages (HP LaserJet 1010 series printers only)............................................................101
Control-panel lights (HP LaserJet 1010 series printers).....................................................................102
Control-panel light patterns (HP LJ 1010 series printers)..................................................102
Fatal errors (HP LJ 1010 series printers)...........................................................................105
Control-panel lights (HP LaserJet 1020 printer).................................................................................106
Status-light patterns...........................................................................................................106
Jams...................................................................................................................................................108
Clearing jams.....................................................................................................................108
Typical media jam locations..............................................................................108
Removing a jammed page................................................................................108
Print-quality troubleshooting...............................................................................................................111
Print-cartridge problems....................................................................................................111
Checking the print cartridge..............................................................................111
To redistribute toner in the print cartridge.........................................111
Solving print-quality problems............................................................................................111
Solving paper-feed problems.............................................................................................................122
Functional checks...............................................................................................................................124
ENWW v