Brother DCP-L5500D Service Manual page 79

 Error code 1901
Detected a TT motor failure.
Step
Malfunction of the TT control
1
PCB
Connection failure of the TT
2
motor harness
LT/TT connector failure
3
(machine side or TT side)
4 TT motor failure
5 TT control PCB failure
6 Main PCB failure
 Error code 1F00
When the TT was connected, TT balance sensor L/R wasn't connected properly.
Step
Connection failure of the TT
1
balance sensor L/R harness.
TT balance sensor L/R
2
attachment failure
LT/TT connector failure
3
(machine side or TT side)
4 TT balance sensor L/R failure
5 TT control PCB failure
6 Main PCB failure
 Error code 3801
A temperature error occurred in the external temperature/humidity sensor.
Step
Connection failure of the
1 external temperature/humidity
sensor harness
External temperature/humidity
2
sensor failure
3 Main PCB failure
 Error code 4000
The number of rotations of the drum unit is reaching the upper limit.
Error code 4200
The number of rotations of the drum unit has reached the upper limit. (Printing does not
stop.)
Step
Replace the drum unit with a
new one and reset the drum
1
counter. If the error display is not
cleared, the main PCB is faulty.
Cause
Install the latest main firmware.
Reconnect the TT motor harness.
Replace the LT/TT connector of the machine
side or TT side.
Replace the TT motor.
Replace the TT control PCB.
Replace the main PCB ASSY.
Cause
Reconnect the TT balance sensor L/R harness
or relay connector harness.
Reattach the TT balance sensor L/R.
Replace the LT/TT connector of the machine
side or TT side.
Replace the TT balance sensor L/R.
Replace the TT control PCB ASSY.
Replace the main PCB ASSY.
Cause
Reconnect the external temperature/humidity
sensor harness.
Replace the main frame L ASSY.
Replace the main PCB ASSY.
Cause
Replace the main PCB ASSY.
2-44
Remedy
Remedy
Remedy
Remedy
Confidential