Confidential
4.6 Troubleshooting for Control Panel Problems.......................................................2-75
4.6.1 Nothing is displayed on the LCD ..............................................................2-75
4.6.2 LEDs are not activated............................................................................. 2-75
4.6.3 Control panel is inoperable.......................................................................2-75
4.7 Troubleshooting for Toner and Drum Problems................................................... 2-76
4.7.1 New toner is not detected.........................................................................2-76
4.7.2 Cartridge error (toner cartridge cannot be detected)................................ 2-76
4.7.3 Drum error ................................................................................................ 2-76
4.8 Troubleshooting for Fuser Unit Problems............................................................2-77
4.8.1 Fuser unit failure.......................................................................................2-77
4.9 Troubleshooting for Laser Unit Problems ............................................................2-78
4.9.1 Laser unit failure.......................................................................................2-78
4.10 Troubleshooting for PCB Problems .....................................................................2-79
4.10.1 Main PCB failure ...................................................................................... 2-79
4.10.2 High-voltage power supply PCB failure....................................................2-79
4.10.3 Low-voltage power supply PCB failure.....................................................2-79
4.11 Troubleshooting for Other Problems.................................................................... 2-80
4.11.1 Machine is not turned ON......................................................................... 2-80
4.11.2 Main fan does not rotate...........................................................................2-80
4.11.3 Main motor failure.....................................................................................2-80
4.11.4 Unusual noise is generated from the machine ......................................... 2-80
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