Brother HL-4040CN, HL-4050CDN, HL-4070CDW Service Manual page 29

Error code 2A
Print Unable 2A
Turn the power off and then back on again.
Belt cleaner release sensor failure
Step
1 Rotation defective of release
shaft A of waste toner box.
2 Harness connection failure
between belt cleaner release
sensor PCB and belt cleaner
release solenoid.
3 Belt cleaner release sensor
actuator performance
defective
4 Belt cleaner release sensor
PCB failure
5 Belt cleaner release solenoid
failure
6 Engine PCB failure
Error code 2B
Print Unable 2B
Turn the power off and then back on again.
Air intake fan (AIR) failure
Step
1 Air intake fan (AIR) harness
connection failure
2 Air intake fan (AIR) failure
3 Engine PCB failure
Cause
Replace the waste toner box.
Check the harness connection between the belt
cleaner release sensor PCB and belt cleaner
release solenoid and reconnect them.
Replace the belt cleaner release ASSY.
Check the sensor performance following the
procedure described in
any problem occurs, replace the belt cleaner
release sensor PCB ASSY.
Replace the belt cleaner release ASSY.
Replace the engine PCB ASSY.
Cause
Check the harness connection of the air intake fan
(AIR) and reconnect it.
Check the fan performance following the
procedure described in
any problem occurs, replace the air intake fan
(AIR).
Replace the engine PCB ASSY.
1-12
Remedy
"Maintenance mode
Remedy
"Maintenance mode
Confidential
32". If
78". If