Brother MFC-7450

1-9
Confidential
■ Error code 5A
HVPS PCB failure (Developing bias voltage failure)
■ Error code 5B
New toner detection lever malfunction
Print Unable 5A
See Troubleshooting and routine maintenance chapter in User’s Guide.
Step Cause Remedy
1
HVPS PCB ASSY harness
connection failure
Check the harness connection between the
HVPS PCB and main PCB. Then,
reconnect them.
2 HVPS PCB failure Replace the HVPS PCB ASSY.
3 Main PCB failure Replace the main PCB ASSY.
Cartridge Error
Put the Black Toner Cartridge back in.
User Check
• Check if the toner cartridge is attached.
Step Cause Remedy
1
New toner detection switch
harness connection failure
Check the harness connection of the new
toner detection switch. Then, reconnect it.
2 New toner detection switch failure Replace the new toner harness ASSY.
3 Main PCB failure Replace the main PCB ASSY.