Brother  HL-4140CN, Service Manual

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Confidential
■ Error code 56
The fuser cover is open.
<User Check>
- Close the fuser cover properly.
■
Error code 57
Paper is jammed in the duplex paper feed system.
<User Check>
- Check if the paper is jammed. If jammed, remove it.
- Use the A4 or letter size paper.
Cover is Open
Close the Fuser Cover which can be found behind the Back Cover of the
machine.
Step Cause Remedy
1 Paper eject actuator catching on
some position Correct the position of the paper eject
actuator.
2 Paper eject sensor PCB failure Check the sensor performance following
the procedure described in
“Function code
32” . If any problem occurs, replace the
paper eject sensor PCB ASSY.
3 Main PCB failure Replace the main PCB ASSY.
Jam Duplex
Pull out Tray 1 completely. Check inside the machine or open the Back Cover
to remove the jammed paper.
Step Cause Remedy
1 Foreign object around paper
eject Remove the foreign object.
2 Foreign object around paper
guide DX ASSY Remove the foreign object.
3 Coming off of back flapper ASSY Re-assemble the back flapper ASSY.
4 Duplex feed ASSY not
assembled correctly Re-assemble the duplex feed ASSY.
5 Duplex paper guide not
assembled correctly Re-assemble the duplex paper guide.
6 Harness connection failure of
paper eject ASSY Check the harness connection of the
paper eject ASSY and reconnect it.
7 Paper eject motor failure Replace the paper eject motor.
8 Duplex feed ASSY and Duplex
paper guide failure Replace the paper tray 1.
9 Paper eject ASSY failure Replace the paper eject ASSY.
10 Engine PCB failure Replace the engine PCB ASSY.
11 Main PCB failure Replace the main PCB ASSY.