HP LASERJET ENTERPRISE M725dn Troubleshooting Manual page 11

2 Solve problems ............................................................................................................. 111
Solve problems checklist ....................................................................................................... 112
Helpful printed pages ........................................................................................................... 114
Menu map ........................................................................................................... 114
Current settings pages ........................................................................................... 114
Preboot menu options ........................................................................................................... 115
Troubleshooting process ........................................................................................................ 122
Determine the problem source ................................................................................. 122
Power subsystem ................................................................................................... 123
Control-panel checks ............................................................................................. 124
Scanning subsystem .............................................................................................. 132
Tools for troubleshooting ....................................................................................................... 133
Individual component diagnostics ............................................................................ 133
ENWW
Troubleshooting flowchart ....................................................................... 122
Power-on checks .................................................................................... 123
Power-on troubleshooting overview ............................................ 123
Control-panel diagnostic flowcharts .......................................................... 126
Touchscreen black, white, or dim (no image) .............................. 127
Touchscreen is slow to respond or requires multiple presses to
respond ................................................................................. 128
Touchscreen has an unresponsive zone ...................................... 129
No control-panel sound ............................................................ 130
Home button is unresponsive .................................................... 131
Hardware integration pocket (HIP) is not functioning (control panel
functional) .............................................................................. 132
LED status .............................................................................................. 133
Understand lights on the formatter ............................................. 133
Engine diagnostics ................................................................................. 135
Engine-test button .................................................................... 135
Paper path test ....................................................................................... 138
Paper path sensor tests ........................................................................... 139
Manual sensor tests ................................................................................ 140
Cartridge door switch (SW3) .................................................... 142
Left door switch (SW1) ............................................................. 143
Right door sensor (SR8) ............................................................ 144
Cartridge install sensor (SR1) .................................................... 145
TOP (top-of-page) sensor (SR9) .................................................. 146
Fuser loop sensor (SR6) ............................................................ 147
Fuser output sensor (SR12) ....................................................... 148
Duplex switchback sensor (SR1) ................................................ 149
Duplexer refeed sensor (SR2) .................................................... 150
ix