Service manual

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