Brother HL-L5000D Service Manual page 91

 Error code 7702
When printing from the paper tray 5, the registration front sensor or the T2/T3/T4/T5TT jam
sensor does not detect paper pass within the specified time after the T5TT paper feed sensor
detected paper pass.
<User Check>
• Remove the jammed paper.
• Add the paper properly using the paper tray 5 paper guide.
• Install the latest main firmware.
Step
Foreign object in the front of the
1
machine
Registration front actuator
2
attachment failure
T2/T3/T4/T5TT jam sensor
3
attachment failure
Connection failure of the
4 registration front/rear sensor
harness
Connection failure of the T2/T3/
5
T4/T5TT jam sensor harness
Connection failure of the TT
6
control PCB harness
Connection failure of the T3/T4/
7
T5TT release clutch harness
T3/T4/T5TT release clutch
8
failure
Registration front/rear sensor
9
PCB failure
T2/T3/T4/T5TT jam sensor PCB
10
failure
11 TT control PCB failure
High-voltage power supply PCB
12
failure
Damaged gears in the TT paper
13
feeding system
14 Main PCB failure
Cause
Remove the foreign object.
Reattach the registration front actuator.
Reattach the T2/T3/T4/T5TT jam sensor.
Reconnect the registration front/rear sensor
harness.
Reconnect the T2/T3/T4/T5TT jam sensor
harness.
Reconnect the TT control PCB harness.
Reconnect the T3/T4/T5TT release clutch
harness.
Replace the T3/T4/T5TT release clutch.
Replace the registration front/rear sensor PCB
ASSY.
Replace the T2/T3/T4/T5TT jam sensor PCB
ASSY.
Replace the TT control PCB ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the TT.
Replace the main PCB ASSY.
2-65
Remedy
Confidential