Brother HL-2290 Service Manual page 5

4.4 Troubleshooting for Software Problems ........................................................................... 2-78
4.4.1 Unable to receive data ......................................................................................... 2-78
4.5 Troubleshooting for Network Problems ............................................................................ 2-79
4.5.1 Cannot make a print through network connection ................................................ 2-79
4.5.2 Cannot connect to access point ........................................................................... 2-79
4.6 Troubleshooting for Control Panel Problems .................................................................... 2-80
4.6.1 Nothing is displayed on the LCD .......................................................................... 2-80
4.6.2 Nothing is displayed on the LED .......................................................................... 2-80
4.6.3 Unable to perform panel operation ....................................................................... 2-80
4.7 Troubleshooting for Toner Cartridge and Drum Unit Problems ........................................ 2-81
4.7.1 New toner not detected ........................................................................................ 2-81
4.7.2 Toner cartridge not detected ................................................................................ 2-81
4.7.3 Toner replacement message displayed on LCD is not cleared ............................ 2-82
4.7.4 Drum error ............................................................................................................ 2-82
4.7.5 Drum replacement message displayed on LCD is not cleared ............................ 2-82
4.8 Troubleshooting for Fuser Unit Problems ......................................................................... 2-83
4.8.1 Fuser unit failure ................................................................................................... 2-83
4.9 Troubleshooting for Laser Unit Problems ......................................................................... 2-83
4.9.1 Laser unit failure ................................................................................................... 2-83
4.10 Troubleshooting for PCB Problems .................................................................................. 2-84
4.10.1 Main PCB failure .................................................................................................. 2-84
4.10.2 Full memory .......................................................................................................... 2-84
4.11 Troubleshooting for Other Problems ................................................................................. 2-85
4.11.1 Cannot make print ................................................................................................ 2-85
4.11.2 Cannot update firmware ....................................................................................... 2-86
4.11.3 "Paper Low" message does not disappear ........................................................... 2-86
4.11.4 Message indicating that the report is full does not disappear .............................. 2-87
4.11.5 Paper tray cannot be recognized ......................................................................... 2-87
CHAPTER 3 DISASSEMBLY/REASSEMBLY
1. SAFETY PRECAUTIONS ............................................................................................................ 3-1
2. PACKING .................................................................................................................................... 3-2
3. SCREW CATALOGUE ................................................................................................................ 3-3
4. SCREW TORQUE LIST .............................................................................................................. 3-4
5. LUBRICATION ............................................................................................................................ 3-6
6. OVERVIEW OF GEARS .............................................................................................................. 3-7
7. HARNESS ROUTING .................................................................................................................. 3-9
8. DISASSEMBLY FLOW CHART ................................................................................................ 3-16
9. DISASSEMBLY PROCEDURE ................................................................................................. 3-17
9.1 Preparation ....................................................................................................................... 3-17
9.2 Back cover ........................................................................................................................ 3-18
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