Brother HL-4040CN, HL-4050CDN, HL-4070CDW Service Manual page 36

Error code 5A
Print Unable 5A
Turn the power off and then back on again.
Charge HVPS PCB failure
Step
1 Charge HVPS PCB ASSY
harness connection failure
2 Charge HVPS PCB failure
3 Engine PCB failure
Error code 5F
Waste Toner Soon
Replace the waste toner box
User Check
- Replace the waste toner box with a new one.
Step
1 Waste toner sensor failure
2 Harness connection failure of
waste toner near/full sensor
ASSY
3 Engine PCB failure
Cause
Check the harness connection between the
charge HVPS PCB and engine PCB, and the one
between the charge HVPS PCB and low-voltage
power supply PCB. Then, reconnect them.
Replace the charge HVPS PCB ASSY.
Replace the engine PCB ASSY.
Cause
Check the sensor performance following the
procedure described in
any problem occurs, replace the waste toner
near/full sensor ASSY.
Check the harness connection of the waste toner
near/full sensor ASSY and reconnect it.
Replace the engine PCB ASSY.
1-19
Remedy
Remedy
"Maintenance mode
Confidential
32". If