Brother HL-L5000D Service Manual page 74

 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 1A01
A communication error occurred between the ASIC and MX control PCB in the engine.
Step
Connection failure of the MX
1
control PCB harness
MX connector failure (machine
2
side or MX side)
3 MX control PCB failure
4 Main PCB failure
 Error code 1B01
Detected an MX motor failure.
Step
Connection failure of the MX
1
motor harness
MX connector failure (machine
2
side or MX side)
3 MX motor failure
4 MX control PCB failure
5 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
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 MX control PCB harness.
Replace the MX connector of the machine side
or MX side.
Replace the MX control PCB.
Replace the main PCB ASSY.
Cause
Reconnect the MX motor harness.
Replace the MX connector of the machine side
or MX side.
Replace the MX motor.
Replace the MX 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.
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Remedy
Remedy
Remedy
Remedy
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