Electrostatic discharge ..................................................................................................... 100 Required tools .................................................................................................................. 101 Before performing service ................................................................................................ 101 After performing service ................................................................................................... 101 Post-service tests ............................................................................................................
101 Test 1 (print-quality test) ................................................................................. 101 Test 2 (copy-quality test) ................................................................................. 102 Test 3 (fax-quality test) .................................................................................... 102 Parts removal order ......................................................................................................... 103 HP LaserJet 3050 all-in-one .............................................................................................................
106 Link assemblies and scanner support-frame springs ...................................................... 107 Scanner side covers ........................................................................................................ 109 Separation-pad set .......................................................................................................... 111 Control-panel bezel .......................................................................................................... 112 Control-panel assembly ...................................................................................................
114 Media lever and media-lever torsion spring ..................................................................... 115 Separation-pad assembly ................................................................................................ 116 Scanner assembly ........................................................................................................... 118 Scanner assembly top cover ........................................................................................... 126 Top-cover assembly ........................................................................................................
129 Pickup roller ..................................................................................................................... 130 White platen ..................................................................................................................... 131 HP LaserJet 3052/3055 all-in-one .................................................................................................... 132 ADF input tray .................................................................................................................. 132 Flatbed lid ........................................................................................................................
133 Link assemblies and scanner support-frame springs ...................................................... 136 Control-panel bezel .......................................................................................................... 138 Control-panel assembly ................................................................................................... 139 ADF separation pad ......................................................................................................... 141 ADF input-tray flag ...........................................................................................................
142 ADF pickup roller and load-arm assembly (HP LaserJet 3052/3055 all-in-one) .............. 143 ADF scanner glass .......................................................................................................... 146 Scanner assembly ........................................................................................................... 148 Printer (product base) ....................................................................................................................... 156 Printer separation pad .....................................................................................................
157 Print cartridge .................................................................................................................. 158 Printer pickup roller .......................................................................................................... 159 Installing the scanner cushions ........................................................................................ 162 Media input tray ............................................................................................................... 163 Transfer roller ..................................................................................................................
165 Side covers ...................................................................................................................... 167 Print-cartridge door .......................................................................................................... 169 Rear cover and fuser cover ............................................................................................. 170 Front cover ....................................................................................................................... 172 Speaker assembly ...........................................................................................................
174 Power supply ................................................................................................................... 175 Formatter and line interface unit (LIU) ............................................................................. 178 Scanner support-frame .................................................................................................... 182 Engine controller unit (ECU) ............................................................................................ 185 Laser/scanner assembly .................................................................................................. 189 ENWW vii