Table of contents 1 Theory of operation ....................................................................................................................................... 1 Basic operation ...................................................................................................................................................... 2 Major systems ..................................................................................................................................... 2 Product block diagram ........................................................................................................................
2 Engine control system ........................................................................................................................................... 3 DC controller ........................................................................................................................................ 4 Low-voltage power supply (LVPS) ...................................................................................................... 5 Overcurrent/overvoltage protection ................................................................................
7 Fuser control ....................................................................................................................................... 9 Fuser-heater protective function ................................................................................... 12 Fuser control functions ................................................................................................... 13 2 Solve problems ...........................................................................................................................................
15 Solve problems checklist ..................................................................................................................................... 16 Menu map ............................................................................................................................................................ 17 Troubleshooting process .................................................................................................................................... 18 Pre-troubleshooting checklist ..........................................................................................................
18 Determine the problem source ......................................................................................................... 19 Troubleshooting flowchart ............................................................................................. 19 Power subsystem .............................................................................................................................. 20 Power-on checks ............................................................................................................ 20 Power-on troubleshooting overview ...........................................................
20 Tools for troubleshooting ................................................................................................................................... 23 Control panel checks ......................................................................................................................... 21 Engine self-test ................................................................................................................................. 23 Troubleshooting process for product not turning on ......................................................................
23 Diagrams ........................................................................................................................................... 24 Block diagrams ............................................................................................................... 24 Location of connectors ................................................................................................... 25 DC controller connections ............................................................................ 25 Paper feed driver PCA connections ..............................................................
26 Duplex driver PCA connections ....................................................................................... 27 ENWW v