Brother MFC-J6935DW - 8700 Paper Jam; Switchback Sensor Cannot Detect Paper Feeding State Even Papers Are

Confidential
2-48
■ Error Code 8700
Paper jam.
- Switchback sensor stays in paper feeding state even after completion of paper
ejection action.
< User Check >
- Remove the jammed paper in front part.
- The paper tray is not set correctly.
■ Error Code 8800
Paper jam.
- Switchback sensor cannot detect paper feeding state even papers are fed during
printing.
< User Check >
- Remove the jammed paper in platen part and front part.
Step Cause Solution
1 Foreign materials in the
feeding path
Remove foreign materials.
2 Switchback actuator caught on
the surrounding parts
Set the switchback frame ASSY into place.
3 Switchback outer paper guide
not mounted in place
Set the switchback outer paper guide into place.
4 Paper feed roller or switchback
roller stained
Clean the paper feed roller or switchback roller.
5 Paper feed roller or switchback
roller defective
Replace the paper feed roller or switchback
roller.
6 PF encoder sensor defective Replace the PF encoder sensor PCB.
7 Maintenance unit defective Replace the maintenance unit.
8 Main PCB defective Replace the main PCB.
Step Cause Solution
1 Foreign materials in the
feeding path
Remove foreign materials.
2 Switchback actuator caught on
the surrounding parts
Set the switchback frame ASSY into place.
3 Switchback sensor harness
connection failure
Reconnect the switchback sensor harness.
4 Paper feed roller or paper
ejection roller stained
Clean the paper feed roller or paper ejection
roller.
5 Paper feed roller or paper
ejection roller defective
Replace the paper feed roller or paper ejection
roller.
6 PF encoder sensor defective Replace the PF encoder sensor PCB.
7 Maintenance unit defective Replace the maintenance unit.
8 Main PCB defective Replace the main PCB.