Brother DCP-L5500D Service Manual page 90

 Error code 7402
When printing from the paper tray 2, the registration front sensor or the T2TT jam sensor
does not detect paper pass within the specified time after the T2(LT or TT) paper feed sensor
detected paper pass.
<User Check>
• Remove the jammed paper.
• Add the paper properly using the paper tray 2 paper guide.
• Install the latest main firmware.
Step
Foreign object in the front of the
1
machine
Registration front actuator
2
attachment failure
T2TT jam sensor attachment
3
failure
Connection failure of the
4 registration front/rear sensor
harness
Connection failure of the T2TT
5
jam sensor harness
Connection failure of the TT
6
control PCB harness
Connection failure of the T2LT
7
control PCB harness
Connection failure of the T2LT
8
release clutch harness
9 T2LT release clutch failure
Registration front/rear sensor
10
PCB failure
11 T2TT jam sensor PCB failure
12 TT control PCB failure
13 T2LT control PCB failure
high-voltage power supply PCB
14
failure
Damaged gears in the paper
15
feeding system
Damaged gears in the LT paper
16
feeding system
Damaged gears in the TT paper
17
feeding system
18 Main PCB failure
Cause
Remove the foreign object.
Reattach the registration front actuator.
Reattach the T2TT jam sensor.
Reconnect the registration front/rear sensor
harness.
Reconnect the T2TT jam sensor harness.
Reconnect the TT control PCB harness.
Reconnect the T2LT control PCB harness.
Reconnect the T2LT release clutch harness.
Replace the T2LT release clutch.
Replace the registration front/rear sensor PCB
ASSY.
Replace the T2TT jam sensor PCB ASSY.
Replace the TT control PCB ASSY.
Replace the T2LT control PCB ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the main frame L ASSY.
Replace the LT.
Replace the TT.
Replace the main PCB ASSY.
2-55
Remedy
Confidential