Brother MFC-J6510DW Service Manual page 78

Error Code 84
Paper Jam
Recording paper jam in paper ejecting. (Any of the paper feeding sensor, registration sensor and
switchback paper sensor sticks to ON even after completion of paper ejection.)
User Check
- Remove the jammed paper.
- Clean the switchback roller.
Step
1 Paper feed sensor actuator caught
on the surrounding parts
2 Registration sensor actuator
caught on the surrounding parts
3 Switchback paper detection
actuator caught on the
surrounding parts
4 Paper feed sensor harness
connection failure
5 Paper feed sensor defective
6 Registration sensor harness
connection failure
7 Registration sensor defective
8 Switchback paper sensor
defective
9 Paper ejection roller worn out
10 Main PCB defective
Cause
Reposition the actuator.
Reposition the actuator.
Reposition the actuator.
Check the connection and reconnect the harness.
Replace the PF encoder/PF sensor harness unit.
Check the connection and reconnect the harness.
Replace the registration sensor PCB ASSY.
Replace the switchback paper sensor PCB ASSY.
Replace the engine unit.
Replace the main PCB ASSY.
2-48
LCD
Solution
Confidential