Brother HL-4040CN, HL-4050CDN, HL-4070CDW Service Manual page 42

Error code 84 (Jam Rear)
Jam Rear
Open the Back Cover and remove the jammed paper.
Paper jam rear side of the machine
Error code 88 (Jam Inside)
Jam Inside
Open the Front Cover, pull out the Drum Unit completely and remove
the jammed paper.
Paper jam inside the machine
User Check
- Check if the paper is jammed. If jammed, remove it.
Step
1 Harness connection failure of
registration front sensor PCB
ASSY, registration rear
sensor PCB ASSY or paper
eject sensor PCB ASSY
2 Registration front actuator,
registration rear actuator or
paper eject actuator catching
on some position.
3a Paper eject sensor PCB
failure
3b Registration front sensor PCB
failure (MP/ T1/ LT)
3c Registration rear sensor PCB
failure
4 Engine PCB failure
Cause
Check the harness connections of the registration
front sensor PCB ASSY, registration rear sensor
PCB ASSY and paper eject sensor PCB ASSY,
and reconnect them.
Correct catching of the registration front actuator,
registration rear actuator or paper eject actuator.
Check the sensor performance following the
procedure described in
any problem occurs, replace the fuser unit.
(MP/ T1) Check the sensor performance following
the procedure described in
32". If any problem occurs, replace the front door
unit ASSY.
(LT) Check the sensor performance following the
procedure described in
any problem occurs, replace the LT paper feed
frame unit.
Check the sensor performance following the
procedure described in
any problem occurs, replace the front door unit
ASSY.
Replace the engine PCB ASSY.
1-25
Remedy
"Maintenance mode
"Maintenance mode
"Maintenance mode
"Maintenance mode
Confidential
32". If
32". If
32". If