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 ......................................................................................................... 20
Troubleshooting flowchart ............................................................................................. 20
Power subsystem .............................................................................................................................. 21
Power-on checks ............................................................................................................ 21
Power-on troubleshooting overview ........................................................... 21
Control panel checks ......................................................................................................................... 22
Tools for troubleshooting ................................................................................................................................... 23
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
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