Brother DCP-L8400CDN Service Manual page 77

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Error code 3801
Print Unable 38
Turn the power off and then back on again.
Temperature error occurred in the external temperature/humidity sensor.
Error code 3802
Print Unable 38
Turn the power off and then back on again.
Humidity error occurred in the external temperature/humidity sensor.
Step
1 Connection failure of the
high-voltage power supply PCB
harness
2 External temperature/humidity
sensor failure
3 Main PCB failure
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Error code 3A00
Print Unable 3A
Turn the power off and then back on again.
Error occurred in the communication between the controller in the main PCB and engine.
Step
1 Main PCB failure
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Error code 4000
Supplies
Drum End Soon.
Number of the drum unit rotations reaches the upper limit soon.
Error code 4200
Supplies
Replace Drum
Number of the drum unit rotations has reached the upper limit. (Printing is not stopped.)
< User Check >
- Prepare a new drum unit.
Step
1 Main PCB failure if the error code
remains after replacing with a
new drum unit and resetting the
drum counter
Cause
Reconnect the high-voltage power supply
PCB harness.
Replace the high-voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
Cause
Replace the main PCB ASSY.
Cause
Replace the main PCB ASSY.
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Remedy
Remedy
Remedy
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