Brother HL-4050CDN - Page 34

Confidential
1-17
Error code 3F
Print Unable 3F
Turn the power off and then back on again.
Writing error into engine program
Step Cause
Remedy
1 The machine is turned off
while rewriting the data into
the engine program.
Turn the power on. Resend the engine program
data (DJF format) with the USB memory while the
error code is being indicated.
Error code 56
Cover is Open
Close the Back Cover.
Back cover opened
User Check
- Check if the back cover is closed certainly.
Step Cause
Remedy
1 Back cover switch failure Check the sensor performance following the
procedure described in “Maintenance mode 32”.
2 Harness connection failure of
back cover switch ASSY
Check the harness connection of the back cover
switch ASSY and reconnect it.
3 Part pressing the back cover
switch is broken, which is
provided at the right side of
back cover inside.
Replace the back cover switch ASSY.
4 Engine PCB failure Replace the engine PCB ASSY.
Error code 57
Jam Duplex
Pull out Tray 1 completely. Check inside the machine or open the Back
Cover to remove the jammed paper.
Paper jam while turning it over in duplex printing, or DX solenoid failure
User Check
- Check if the paper is jammed or not. If jammed, remove it.
Step Cause
Remedy
1 DX feed ASSY not assembled
correctly
Reassemble the DX feed ASSY.
2 Paper eject ASSY harness
connection failure
Check the harness connection of the paper eject
ASSY and reconnect it.
3 DX solenoid failure Replace the paper eject ASSY.
4 Engine PCB failure Replace the engine PCB ASSY.