Brother MFC-B7720DN Service Manual

2-81
Confidential
 Paper jam at the paper feeding section at the center of the machine
<User Check>
• Check that the paper is set in each paper tray correctly.
• Flip over the paper in each paper tray or rotate the paper 180°.
• Adjust each paper guide according to the paper size.
• Check that there is not too much paper set in each paper tray.
• Check that the thickness of the paper is 60 to 163 g/m
2
for the paper tray,
and 60 to 230 g/m
2
for the MP tray.
• Flip through the paper and reset it in the paper tray.
• Replace the drum unit.
Step Cause Remedy
1
Foreign object inside the
machine
Remove the foreign object.
2 Eject actuator coming off Reattach the eject actuator.
3
Connection failure of the eject
sensor harness
Reconnect the eject sensor harness.
4 Fuser cover attachment failure Reattach the fuser cover.
5 Damaged fuser drive gear Replace the fuser drive gear.
6 Eject sensor failure Replace the eject sensor PCB ASSY.
7 Registration rear sensor failure Replace the actuator holder ASSY.
8 Paper feed motor failure Replace the paper feed motor.
9
Damaged gears in the paper
feed drive system
Replace the frame L unit.
10 Damaged fuser unit Replace the fuser unit.
11 Main PCB failure Replace the main PCB ASSY.

Brother MFC-B7720DN Specifications

General

Brand	Brother
Model	MFC-B7720DN
Category	All in One Printer
Language	English