List of figures Figure 1-1 Front and right-side view (HP LJ 1010 series printers)...................................................................4 Figure 1-2 Back and left-side view (HP LJ 1010 series printers)......................................................................5 Figure 1-3 Front and right-side view (HP LJ 1020 printer)...............................................................................6 Figure 1-4 Back and left-side view (HP LJ 1020 printer)..................................................................................6 Figure 1-5 Model- and serial-number label (HP LJ 1010 printer is shown)......................................................7 Figure 2-1 HP LaserJet 1010 series printer dimensions................................................................................18 Figure 2-2 HP LaserJet 1020 printer dimensions...........................................................................................18 Figure 2-3 Control-panel lights and buttons (HP LJ 1010 series printers)......................................................19 Figure 2-4 Control-panel lights (HP LJ 1020 printer)......................................................................................20 Figure 3-1 Main input tray (HP LaserJet 1020 printer shown)........................................................................40 Figure 3-2 Output-bin extension ....................................................................................................................41 Figure 4-1 Basic configuration........................................................................................................................46 Figure 4-2 Printer functional-block diagram....................................................................................................50 Figure 4-3 Laser/scanner operation...............................................................................................................52 Figure 4-4 High-voltage power supply circuit.................................................................................................54 Figure 4-5 Image formation-block diagram.....................................................................................................55 Figure 4-6 Printer paper path ........................................................................................................................57 Figure 4-7 Solenoid, sensors, switches, and motor........................................................................................59 Figure 4-8 Printer timing diagram...................................................................................................................61 Figure 5-1 Removing the print cartridge.........................................................................................................65 Figure 5-2 HP LaserJet 1015 parallel port......................................................................................................66 Figure 5-3 Parts-removal block diagram........................................................................................................67 Figure 5-4 Main input tray (HP LaserJet 1020 printer shown)........................................................................73 Figure 5-5 Output-bin extension ....................................................................................................................74 Figure 5-6 Remove the right-side cover (1 of 4; HP LJ 1020 printer shown).................................................75 Figure 5-7 Remove the right-side cover (2 of 4; HP LJ 1020 printer shown).................................................75 Figure 5-8 Remove the right-side cover (3 of 4; HP LJ 1020 printer shown).................................................76 Figure 5-9 Remove the right-side cover (4 of 4; HP LJ 1020 printer shown).................................................76 Figure 5-10 Remove the rear panel and top-cover assembly (1 of 6)..............................................................77 Figure 5-11 Remove the rear panel and top-cover assembly (2 of 6)..............................................................78 Figure 5-12 Remove the rear panel and top-cover assembly (3 of 6)..............................................................78 Figure 5-13 Remove the rear panel and top-cover assembly (4 of 6; HP LJ 1020 printer shown)...................79 Figure 5-14 Remove the rear panel and top-cover assembly (5 of 6)..............................................................79 Figure 5-15 Remove the rear panel and top-cover assembly (6 of 6)..............................................................80 Figure 5-16 Reinstall the top-cover assembly (1 of 2)......................................................................................80 Figure 5-17 Reinstall the top-cover assembly (2 of 2)......................................................................................81 Figure 5-18 Remove the front cover (1 of 3)....................................................................................................82 Figure 5-19 Remove the front cover (2 of 3)....................................................................................................83 Figure 5-20 Remove the front cover (3 of 3)....................................................................................................83 Figure 5-21 Remove the transfer roller (1 of 3)................................................................................................84 ENWW ix