Power-on checks ............................................................................................. 132
Tools for troubleshooting .................................................................................................................. 133
Individual component diagnostics .................................................................................... 133
LED diagnostics .............................................................................................. 133
LED indicators ................................................................................ 133
Formatter heartbeat LED ................................................................ 133
HP Jetdirect LEDs .......................................................................... 134
Engine diagnostics .......................................................................................... 134
Engine-test button .......................................................................... 134
Fuser test page ............................................................................................... 135
Paper-path test (and automatic sensors test) ................................................. 136
Sensor test (interactive) .................................................................................. 137
A TOP (Top-of-Page) sensor .......................................................... 140
B Fuser output sensor .................................................................... 141
C Duplex sensor ............................................................................. 142
D Paper width sensor 1 .................................................................. 143
E Tray 3 feed sensor ...................................................................... 144
F Tray 4 feed sensor ...................................................................... 145
G FD tray full sensor ....................................................................... 146
H Face up detect sensor ................................................................ 147
I Cartridge-door open switch .......................................................... 148
J Rear cover open sensor .............................................................. 149
K Tray 1 paper sensor .................................................................... 150
L Tray 2 paper sensor .................................................................... 151
M Tray 2 detect switch .................................................................... 152
N Tray 3 paper sensor .................................................................... 153
O Tray 3 detect switch .................................................................... 154
P Tray 4 paper sensor .................................................................... 155
Q Tray 4 detect switch .................................................................... 156
Print/stop test .................................................................................................. 157
Component tests ............................................................................................. 158
Half self-test .................................................................................... 158
Drum rotation test check ................................................................. 158
Diagnostics menu components test ................................................ 158
Diagrams ......................................................................................................................... 160
Block diagrams ................................................................................................ 160
Plug/jack locations .......................................................................................... 162
Location of connectors .................................................................................... 163
ECU controller connections ............................................................ 163
Locations of major components ...................................................................... 165
General timing charts ...................................................................................... 169
General circuit diagram ................................................................................... 170
Internal print quality test pages ........................................................................................ 171
Cleaning page ................................................................................................. 172
viii ENWW
