Confidential
4.6.2 Control panel is inoperable.......................................................................2-87
4.7 Troubleshooting for Toner and Drum Problems...................................................2-88
4.7.1 New toner is not detected......................................................................... 2-88
4.7.2 Cartridge error (toner cartridge cannot be detected)................................2-88
4.7.3 Drum error ................................................................................................2-88
4.8 Troubleshooting for Fuser Unit Problems............................................................ 2-89
4.8.1 Fuser unit failure.......................................................................................2-89
4.9 Troubleshooting for Laser Unit Problems ............................................................ 2-90
4.9.1 Laser unit failure....................................................................................... 2-90
4.10 Troubleshooting for PCB Problems ..................................................................... 2-91
4.10.1 Main PCB failure ...................................................................................... 2-91
4.10.2 High-voltage power supply PCB failure.................................................... 2-91
4.10.3 Low-voltage power supply PCB failure..................................................... 2-91
4.11 Troubleshooting for Document Feeding Problems .............................................. 2-92
4.11.1 Multiple sheets of document are fed ........................................................2-92
4.11.2 Document becomes wrinkled ................................................................... 2-92
4.11.3 Document size is not detected correctly................................................... 2-92
4.12 Troubleshooting for Image Defects...................................................................... 2-93
4.12.1 Defect examples....................................................................................... 2-93
4.12.2 Troubleshooting according to image defect ............................................. 2-93
4.13 Troubleshooting for Fax Problems....................................................................... 2-96
4.13.1 Fax cannot be sent................................................................................... 2-96
4.13.2 Fax cannot be received ............................................................................2-96
4.13.3 Bell does not sound.................................................................................. 2-96
4.13.4 Communication error occurs .................................................................... 2-96
4.14 Troubleshooting for Other Problems.................................................................... 2-97
4.14.1 Machine is not turned ON.........................................................................2-97
4.14.2 Main fan does not rotate...........................................................................2-97
4.14.3 Main motor failure..................................................................................... 2-97
4.14.4 Unusual noise is generated from the machine .........................................2-97
4.14.5 Malfunction of the memory .......................................................................2-97
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