HP LaserJet Pro M402d - Page 10

Memory chip .................................................................................................................... 27
Toner level and cartridge life detection .......................................................................... 27
Pickup, feed, and delivery system ....................................................................................................................... 27
Sensors and switches ........................................................................................................................ 29
Motors, clutches, and solenoids ........................................................................................................ 31
Jam detection/prevention ................................................................................................................. 31
Paper feeder (optional Tray 3) ............................................................................................................................. 35
Basic operation .................................................................................................................................. 35
Paper path ....................................................................................................................... 35
Paper feeder controller ................................................................................................... 35
Motor control .................................................................................................................. 36
Pickup and feed operation ................................................................................................................ 36
Electrical components, pickup and feed ......................................................................... 36
Other functions ............................................................................................................... 37
Jam detection .................................................................................................................. 38
2 Solve problems ............................................................................................................................................ 39
For additional service and support ..................................................................................................................... 40
Solve problems checklist ..................................................................................................................................... 41
Solve problems checklist ................................................................................................................... 41
Print the menu map ........................................................................................................ 42
Print a conguration page .............................................................................................. 42
Print the service page (includes the event log) .............................................................. 43
Print the demo page ....................................................................................................... 43
Troubleshooting process ..................................................................................................................................... 44
Determine the problem source ......................................................................................................... 44
Pre-troubleshooting checklist ........................................................................................ 44
Determine the problem source ....................................................................................... 46
Power subsystem .............................................................................................................................. 47
Power-on checks ............................................................................................................. 47
Control panel checks ......................................................................................................................... 47
Tools for troubleshooting .................................................................................................................................... 49
Component diagnostics .................................................................................................................... 49
LED diagnostics ............................................................................................................... 49
Network LEDs (network models only) ......................................................... 49
Control panel LEDs ....................................................................................... 49
Engine diagnostics .......................................................................................................... 50
Engine test .................................................................................................... 50
Diagrams ........................................................................................................................................... 51
Diagrams: Block diagrams .............................................................................................. 51
Cross-sectional view of printer .................................................................... 51
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