Brother HL-L5000D Service Manual page 73

 Error code 1701
Detected a TT fan failure.
Step
Malfunction of the TT control
1
PCB
Connection failure of the TT fan
2
harness
LT/TT connector failure
3
(machine side or TT side)
4 TT fan failure
5 TT control PCB failure
6 Main PCB failure
 Error code 1801
A communication error occurred between the ASIC and T2LT control PCB in the engine. (LT
only)
Error code 1802
A communication error occurred between the ASIC and T3LT control PCB ASSY in the
engine. (LT only)
Error code 1803
A communication error occurred between the ASIC and T4LT control PCB ASSY in the
engine. (LT only)
Step
Malfunction of the LT control
1
PCB
An LT/TT connector failure
2
(machine side or LT side)
3 An LT control PCB failure
4 Main PCB failure
 Error code 1808
A communication error occurred between the ASIC and TT control PCB in the engine.
Step
Malfunction of the TT control
1
PCB
LT/TT connector failure
2
(machine or TT side)
3 TT control PCB failure
4 Main PCB failure
Cause
Install the latest main firmware.
Reconnect the TT fan harness.
Replace the LT/TT connector of the machine
side or TT side.
Replace the TT fan.
Replace the TT control PCB.
Replace the main PCB ASSY.
Cause
Install the latest main firmware.
Replace the appropriate LT/TT connector of the
machine side or LT side.
Replace the appropriate LT control PCB.
Replace the main PCB ASSY.
Cause
Install the latest main firmware.
Replace the LT/TT connector on the machine
side or TT side.
Replace the TT control PCB.
Replace the main PCB ASSY.
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Remedy
Remedy
Remedy
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