Brother DCP-L8400CDN Service Manual page 93

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Error code 7700
Jam 2-sided
Pull the paper tray completely out of the machine. Check inside the machine
towards the rear. Or open the Back Cover to remove the jammed paper.
After the first side is printed in 2-sided printing mode, the registration front sensor does not
detect paper pass after a set period of time.
< User Check >
- Remove the jammed paper.
- Check if the back cover is closed correctly.
- Check if the paper tray 1 is closed correctly.
Step
1 Foreign object inside the duplex
path
2 Foreign object inside the duplex
path of the paper tray 1
3 Fuser cover installation failure
4 Back cover installation failure
5 Main PCB failure
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Error code 8402
No Tray
The paper tray cannot be detected, re-install Tray2.
While the T2 paper tray unit is open state, print or adjustment operation was attempted.
< User Check >
- Check if the T2 paper tray unit is closed correctly.
Step
1 T2 paper feed actuator that has
come off or that has been caught
2 Main PCB failure
Cause
Remove the foreign object.
Remove the foreign object.
Re-assemble the fuser cover.
Re-assemble the back cover.
Replace the main PCB ASSY.
Cause
Re-assemble the T2 paper feed actuator.
Replace the main PCB ASSY.
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Remedy
Remedy
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