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4.11.2Cannot update firmware
<User Check>
• Make sure that there is no other function running.
• Turn the power switch OFF and then back ON again.
* By the above update procedure, the other models firmware can be updated to the machine. 
(You can update LCD models firmware to LED models.) Check that the firmware is right and 
update correctly. If the other models firmware was updated by mistake, the machine may 
repeat power ON/OFF or not powered ON. In such case, replace the main PCB. 
4.11.3“Paper Low” message does not disappear
<User Check>
• Turn the power switch OFF and then back ON again.
• Refill the paper in the appropriate paper tray.
Step Cause Remedy
1
Firmware version does not 
match
Reinstall the latest sub firmware and main 
firmware in this order.
2
In case of update failure by 
interruption, the firmware 
might not correctly written in 
the ROM
Update the firmware again by the following 
procedure.*
1) Turn OFF the machine.
2) For LED models
Open the front cover and then turn ON 
the machine while pressing the [Go]. If the 
Paper, Drum, and Toner LEDs light, 
release the [Go]. If all LEDs go out, press 
the [Go] four times.
For LCD models
Turn ON the machine while pressing the 
[OK] and [Go].
3) Double-click the “Filedg32.exe” to start, 
and select “Brother Maintenance USB 
Printer”.
4) Drag and drop the firmware (upd file) in 
the FILEDG32 screen. Update is started.
3 Main PCB failure Replace the main PCB ASSY.
Step Cause Remedy
1
Damaged plate-up plate in 
the paper tray
Replace the paper tray.
2 Paper feed motor failure Replace the paper feed motor.
3
Damaged plate push-up 
mechanism in the machine
Replace the frame L unit.
4 Main PCB failure Replace the main PCB ASSY.