Brother HL-L8250CDN Service Manual page 5

4.2.8 Unable to perform 2-sided printing .................................................................. 2-83
4.2.9 Paper jam ........................................................................................................ 2-84
4.3 Troubleshooting for Image Defects........................................................................... 2-88
4.3.1 Image defect examples ................................................................................... 2-88
4.3.2 Troubleshooting image defect ......................................................................... 2-89
4.4 Troubleshooting for Software Problems ................................................................. 2-106
4.4.1 Unable to receive data................................................................................... 2-106
4.5 Troubleshooting for Network Problems .................................................................. 2-107
4.5.1 Cannot make a print through network connection ......................................... 2-107
4.6 Troubleshooting for Control Panel Problems.......................................................... 2-108
4.6.1 Nothing is displayed on the LCD/LED ........................................................... 2-108
4.6.2 Unable to perform panel operation ................................................................ 2-109
4.7 Troubleshooting for Toner Cartridge and Drum Unit Problems............................... 2-110
4.7.1 New toner not detected ................................................................................. 2-110
4.7.2 Toner cartridge not detected.......................................................................... 2-110
4.7.3 Toner replacement message displayed on LCD is not cleared ..................... 2-110
4.7.4 Drum error ......................................................................................................2-111
4.7.5 Drum replacement message displayed on LCD is not cleared.......................2-111
4.8 Troubleshooting for Fuser Unit Problems ............................................................... 2-112
4.8.1 Fuser unit failure............................................................................................ 2-112
4.9 Troubleshooting for Laser Unit Problems ............................................................... 2-112
4.9.1 Laser unit failure ............................................................................................ 2-112
4.10 Troubleshooting for PCB Problems ...................................................................... 2-113
4.10.1 Main PCB failure.......................................................................................... 2-113
4.10.2 Full memory................................................................................................. 2-113
4.10.3 Problem of print restriction/ID authentication............................................... 2-113
4.11 Troubleshooting for Other Problems ..................................................................... 2-114
4.11.1 Cannot make print........................................................................................ 2-114
4.11.2 Problem of USB direct interface................................................................... 2-114
4.11.3 Cannot update firmware............................................................................... 2-114
CHAPTER 3 DISASSEMBLY AND ASSEMBLY
1. SAFETY PRECAUTIONS ..........................................................................3-1
2. PACKING....................................................................................................3-2
3. SCREW CATALOGUE ...............................................................................3-3
4. SCREW TORQUE LIST .............................................................................3-4
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