Brother HL-4140CN Service Manual page 108

■ Error code DE
Print Unable DE
Turn the power off and then back on again.
When the center thermistor is higher than the idle temperature, it is detected that the side
thermistor temperature is lower than 60 °C.
Step
1 Harness connection failure
between paper eject sensor PCB
ASSY and fuser unit
2 Side thermistor or center
thermistor failure
3 Paper eject sensor PCB ASSY
failure
4 Main PCB failure
■ Error code E0
Print Unable E0
Turn the power off and then back on again.
Program error. (An error occurred in the ROM checksum.)
Step
1 Firmware update failure
2 Main PCB failure
■ Error code E1
Print Unable E1
Turn the power off and then back on again.
Program error.
Step
1 Firmware update failure
2 Main PCB failure
Cause
Cause
Cause
2-77
Remedy
Check the harness connection between
the paper eject sensor PCB ASSY and
fuser unit, and reconnect it.
Replace the fuser unit.
Replace the paper eject sensor PCB
ASSY.
Replace the main PCB ASSY.
Remedy
Upload the latest firmware.
Replace the main PCB ASSY.
Remedy
Upload the latest firmware.
Replace the main PCB ASSY.
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