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