Replacing the main input tray (paper pickup tray assembly)............................................33 Replacing the output tray extension (delivery tray assembly)..........................................34 4 Operational overview Basic functions........................................................................................................................36 Formatter system....................................................................................................................37 Central processing unit ....................................................................................................37 RAM..................................................................................................................................
37 Universal Serial Bus interface..........................................................................................37 Parallel interface (HP LaserJet 1015 only).......................................................................37 Control panel....................................................................................................................37 Draft mode .......................................................................................................................38 MEt...................................................................................................................................
38 Enhanced I/O ...................................................................................................................38 PJL overview ...................................................................................................................38 Printer functions......................................................................................................................39 Engine control system (engine control unit and power assembly)...................................39 Image formation system...................................................................................................43 Printer paper feed system................................................................................................44 Jam detection ..................................................................................................................46 Solenoid, sensors, and switches......................................................................................46 Basic sequence of operation (formatter-to-printer)...........................................................47 5 Removal and replacement Removal and replacement strategy........................................................................................52 Required tools .................................................................................................................52 Before performing service................................................................................................52 Print cartridge ..................................................................................................................52 Differences between the series models............................................................................53 Part removal order ...........................................................................................................53 User-replaceable parts ...........................................................................................................55 Replacing the printer pickup roller ...................................................................................55 Replacing the printer separation pad................................................................................57 Replacing the main input tray (paper pick-up tray assembly)...........................................59 Replacing the output tray extension (delivery tray assembly)..........................................60 Covers.....................................................................................................................................
61 Right side cover................................................................................................................62 Left side cover..................................................................................................................65 Print cartridge access door, fuser cover, and rear panel..................................................65 Front cover.......................................................................................................................68 Internal assemblies.................................................................................................................70 Transfer roller assembly...................................................................................................70 Engine power assembly...................................................................................................72 Fuser (fixing) assembly....................................................................................................73 Paper pickup assembly....................................................................................................75 Engine control unit assembly............................................................................................76 Laser scanner assembly...................................................................................................78 6 Troubleshooting Basic troubleshooting..............................................................................................................82 Control panel power-on functions...........................................................................................84 Power-on Functions:
Time Ranges..................................................................................84 Control Panel Pages...............................................................................................................86 Control Panel Pages: Time Ranges.................................................................................86 iv ENWW