Brother DCP-L8400CDN Service Manual page 90

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Error code 7100
Jam Rear
Open the Back Cover and remove the jammed paper, then press [Start].
After the registration rear sensor detects the end of paper pass and the specified period of
time has passed, the eject sensor continues to detect paper pass.
< User Check >
- Remove the jammed paper.
- Check if the back cover is not open during 2-sided printing.
Step
1 Foreign object at the back of the
machine
2 Eject actuator caught on some
position
3 Fuser cover installation failure
4 Back cover installation failure
5 Eject sensor failure
6 Back cover failure
7 Fuser drive gear Z25 damaged
8 Paper eject ASSY failure
9 Paper feed related gear
damaged
10 Fuser unit failure
11 Main PCB failure
Cause
Remove the foreign object.
Re-assemble the eject actuator.
Re-assemble the fuser cover.
Re-assemble the back cover.
Replace the eject sensor PCB ASSY.
Replace the back cover.
Replace the fuser drive gear Z25.
Replace the paper eject ASSY.
Replace the main drive unit.
Replace the fuser unit.
Replace the main PCB ASSY.
2-60
Remedy
Confidential