Brother DCP-L8400CDN Service Manual page 5

3.3 Communications Error Code .................................................................................... 2-35
4. TROUBLESHOOTING .............................................................................2-39
4.1 Error Cause and Remedy ......................................................................................... 2-39
4.2 Troubleshooting for Paper Feeding Problems .......................................................... 2-87
4.2.1 No paper feeding from paper tray 1................................................................. 2-87
4.2.2 No paper feeding from T2 paper tray unit........................................................ 2-88
4.2.3 No paper feeding from MP tray ....................................................................... 2-89
4.2.4 Multiple sheets of paper are fed ...................................................................... 2-90
4.2.5 Paper becomes wrinkled ................................................................................. 2-90
4.2.6 Paper is fed at an angle................................................................................... 2-90
4.2.7 Paper curls ...................................................................................................... 2-91
4.2.8 Unable to perform 2-sided printing .................................................................. 2-91
4.2.9 Paper jam ........................................................................................................ 2-92
4.3 Troubleshooting for Image Defects........................................................................... 2-96
4.3.1 Image defect examples ................................................................................... 2-96
4.3.2 Troubleshooting image defect ......................................................................... 2-97
4.4 Troubleshooting for Software Problems ................................................................. 2-114
4.4.1 Unable to receive data................................................................................... 2-114
4.5 Troubleshooting for Network Problems .................................................................. 2-115
4.5.1 Cannot make a print through network connection ......................................... 2-115
4.6 Troubleshooting for Control Panel Problems.......................................................... 2-116
4.6.1 Nothing is displayed on the LCD ................................................................... 2-116
4.6.2 Unable to perform panel operation ................................................................ 2-117
4.6.3 The machine does not enter the ready state when the power is turned ON.. 2-118
4.7 Troubleshooting for Toner Cartridge and Drum Unit Problems............................... 2-119
4.7.1 New toner not detected ................................................................................. 2-119
4.7.2 Toner cartridge not detected.......................................................................... 2-119
4.7.3 Toner replacement message displayed on LCD is not cleared ..................... 2-119
4.7.4 Drum error ..................................................................................................... 2-120
4.7.5 Drum replacement message displayed on LCD is not cleared...................... 2-120
4.8 Troubleshooting for Fuser Unit Problems ............................................................... 2-121
4.8.1 Fuser unit failure............................................................................................ 2-121
4.9 Troubleshooting for Laser Unit Problems ............................................................... 2-121
4.9.1 Laser unit failure ............................................................................................ 2-121
4.10 Troubleshooting for PCB Problems ...................................................................... 2-122
4.10.1 Main PCB failure.......................................................................................... 2-122
4.10.2 Full memory................................................................................................. 2-122
4.10.3 Problem of print restriction/ID authentication............................................... 2-122
4.11 Document Feeding Problems ............................................................................... 2-123
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