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Brother mfc-3420c Service Manual page 8

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CHAPTER 8 ERROR INDICATION AND TROUBLESHOOTING
This chapter details error messages and codes that the incorporated self-diagnostic functions
display if any error or malfunction occurs. If any error message appears, refer to this chapter to
find which components should be checked or replaced.
The latter half of this chapter provides sample problems that could occur in the main sections of
the machine and related troubleshooting procedures. This will help service personnel pinpoint and
repair defective components.
8.1
ERROR INDICATION ..................................................................................................8-1
8.1.1
Equipment Errors .............................................................................................8-1
[ 1 ]
Error messages appearing on the LCD .....................................................8-1
[ 2 ]
Error codes contained in "MACHINE ERROR X X" messages ..................8-4
8.1.2
Communications Errors..................................................................................8-11
8.2
TROUBLESHOOTING ..............................................................................................8-18
8.2.1
Introduction ....................................................................................................8-18
8.2.2
Precautions ....................................................................................................8-18
8.2.3
Checking prior to Troubleshooting ..................................................................8-18
8.2.4
Troubleshooting based on problem type .........................................................8-20
[ 1 ]
Control panel problems ..........................................................................8-20
[ 2 ]
Telephone problems...............................................................................8-20
[ 3 ]
Communications problems .....................................................................8-21
[ 4 ]
Paper/document feeding problems .........................................................8-21
[ 5 ]
Print-image problems .............................................................................8-22
[ 6 ]
PC-driven printing problems...................................................................8-27
8.2.5
Problems encountered frequently in the past ..................................................8-28
[ 1 ]
Paper jams.............................................................................................8-28
[ 2 ]
"MACHINE ERROR 41" error message ..................................................8-29
[ 3 ]
Ink-related problems...............................................................................8-29
[ 4 ]
Auto document feeder (ADF) malfunction...............................................8-30
8.2.6
Possible component defects and resulting problems.......................................8-32
[ 1 ]
ADF mechanism.....................................................................................8-32
[ 2 ]
Scanner mechanism...............................................................................8-33
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