Brother MFC-7450

1-16
Confidential
■ Error code 84 (Jam Rear)
Paper jam in the rear of the machine (It is detects by the eject sensor)
Error code 88 (Jam Inside)
Paper jam inside the machine (It is detects by the registration rear sensor)
Fig. 1-3
Jam Rear
Open the Back Cover and remove the jammed paper.
Jam Inside
Open the Front Cover, pull out the Drum Unit completely and remove
the jammed paper.
User Check
• Check if the paper is jammed. If there is any jammed paper, remove it.
Step Cause Remedy
1
Harness connection failure of
registration front sensor PCB ASSY,
registration rear sensor PCB ASSY
or paper eject sensor PCB ASSY
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.
2
Registration front actuator,
registration rear actuator or paper
eject actuator not operating smoothly
or catching in some position.
Ensure smooth operation of the registration
front actuator, registration rear actuator or
paper eject actuator and ensure they are
not catching in any positions.
3
Paper eject sensor PCB failure Check the sensor performance following
the procedure described in "Maintenance
mode 32". If any problem occurs, replace
the eject sensor PCB ASSY.
4
Registration front sensor PCB
failure
Check the sensor performance following
the procedure described in "Maintenance
mode 32". If any problem occurs, replace
the registration front sensor PCB ASSY.
5
Registration rear sensor PCB
failure
Check the sensor performance following
the procedure described in "Maintenance
mode 32". If any problem occurs, replace
the registration rear sensor PCB ASSY.
6
Registration ground spring failure Re-assemble the registration ground
spring. (Refer to Fig. 1-3.)
7 Main PCB failure Replace the main PCB ASSY.
Registration ground spring
<Main frame R ASSY>