Brother MFC-9340CDW - Page 6

Confidential
4.8 Troubleshooting of the Fuser Unit .......................................................................... 2-109
4.8.1 Fuser unit failure............................................................................................ 2-109
4.9 Troubleshooting of the LED ASSY ......................................................................... 2-110
4.9.1 LED ASSY failure .......................................................................................... 2-110
4.10 Troubleshooting on the PCB..................................................................................2-111
4.10.1 Main PCB failure...........................................................................................2-111
4.10.2 Full memory..................................................................................................2-111
4.10.3 Print overrun .................................................................................................2-111
4.10.4 High-voltage power supply PCB failure ........................................................2-111
4.10.5 Low-voltage power supply PCB failure........................................................ 2-112
4.10.6 Modem PCB failure ..................................................................................... 2-112
4.11 Document Feeding Problems ............................................................................... 2-113
4.11.1 No feeding ................................................................................................... 2-113
4.11.2 Double feeding............................................................................................. 2-113
4.11.3 Paper jam .................................................................................................... 2-114
4.11.4 Wrinkles ....................................................................................................... 2-115
4.11.5 Document size cannot be correctly detected............................................... 2-115
4.12 Scanning Image Defect Troubleshooting.............................................................. 2-116
4.12.1 Image defect examples ............................................................................... 2-116
4.12.2 Troubleshooting image defect ..................................................................... 2-116
4.13 Troubleshooting of FAX Functions........................................................................ 2-120
4.13.1 FAX can't send it.......................................................................................... 2-120
4.13.2 FAX cannot be received. ............................................................................. 2-120
4.13.3 No bell ring .................................................................................................. 2-120
4.13.4 A communication error occurs..................................................................... 2-121
4.14 Others Problems................................................................................................... 2-122
4.14.1 The machine is not turned ON.....................................................................2-122
4.14.2 Main fan not rotate....................................................................................... 2-122
4.14.3 Main motor failure........................................................................................ 2-122
4.14.4 Joint cover ASSY open................................................................................ 2-123
4.14.5 Back cover open.......................................................................................... 2-123
4.14.6 Unusual noise generated from the machine................................................ 2-123
4.14.7 Memory related failure................................................................................. 2-124
4.14.8 Printing related failure..................................................................................2-124
4.14.9 The USB interface does not work................................................................ 2-124
CHAPTER 3 DISASSEMBLY AND ASSEMBLY
1. SAFETY PRECAUTIONS ..........................................................................3-1