Brother HL-L5000D Service Manual page 87

 Error code 7502
When printing from the paper tray 3, the registration front sensor or the T2/T3TT jam sensor
does not detect paper pass within the specified time after the T3(LT or TT) paper feed sensor
detected paper pass.
<User Check>
• Remove the jammed paper.
• Add the paper properly using the paper tray 3 paper guide.
• Install the latest main firmware.
Step
Foreign object in the front of the
1
machine
Registration front actuator
2
attachment failure
T2/T3TT jam sensor attachment
3
failure
Connection failure of the
4 registration front/rear sensor
harness
Connection failure of the T2/
5
T3TT jam sensor harness
Connection failure of the TT
6
control PCB harness
Connection failure of the T2/
7
T3LT control PCB harness
Connection failure of the T2/
8
T3LT release clutch harness
Connection failure of the T3TT
9
release clutch harness
10 T2/T3LT release clutch failure
11 T3TT release clutch failure
Registration front/rear sensor
12
PCB failure
13 T2/T3TT jam sensor PCB failure Replace the T2/T3TT jam sensor PCB ASSY.
14 TT control PCB failure
15 T2/T3LT control PCB failure
High-voltage power supply PCB
16
failure
Damaged gears in the paper
17
feeding system
Damaged gears in an LT paper
18
feeding system
Damaged gears in the TT paper
19
feeding system
20 Main PCB failure
Cause
Remove the foreign object.
Reattach the registration front actuator.
Reattach the T2/T3TT jam sensor.
Reconnect the registration front/rear sensor
harness.
Reconnect the T2/T3TT jam sensor harness.
Reconnect the TT control PCB harness.
Reconnect the T2/T3LT control PCB harness.
Reconnect the T2/T3LT release clutch
harness.
Reconnect the T3TT release clutch harness.
Replace the T2/T3LT release clutch.
Replace the T3TT release clutch.
Replace the registration front/rear sensor PCB
ASSY.
Replace the TT control PCB ASSY.
Replace the T2/T3LT 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.
2-61
Remedy
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