Brother HL-4040CN Service Manual page 49

Brother color laser printer
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Error code C4
Tray 2 Error
Take out Tray 2 and push it back in firmly.
Tray 2 (LT) plate-up function malfunction
User Check
- Check if Tray 2 (LT) is installed into the machine.
Step
1
Connection failure between
the machine and LT
connector
2
Harness connection failure of
plate motor ASSY LT
3
Harness connection failure of
LT paper feed frame unit
4
LT paper feed frame unit
failure
5
Engine PCB failure
Error code C5
EL Error
Open the Front Cover and close it again.
EL lamp electrifying failure
User Check
- Open and close the front cover.
Step
1
Dirt on electrodes on drum
unit and front cover
2
EL lamp PCB failure
3
EL lamp PCB harness broken
4
Engine PCB failure
Error code C6
Toner Error
A Toner is not detected. Put all the Toner Cartridges back in
correctly.
Toner cartridge mis-dividing
Step
1
Harness connection failure of
develop release motor
2
Develop release sensor PCB
failure
3
Engine PCB failure
Cause
Replace the connector.
Check the harness connection of the plate motor
ASSY LT and reconnect it.
Check the harness connection of the LT paper
feed frame unit and reconnect it.
Check the sensor performance following the
procedure described in
any problem occurs, replace the LT paper feed
frame unit.
Replace the engine PCB ASSY.
Cause
Clean both electrodes.
Replace the drum unit.
Replace the front door unit ASSY.
Replace the engine PCB ASSY.
Cause
Check the harness connection of the develop
release motor and reconnect it.
Replace the develop release sensor PCB ASSY.
Replace the engine PCB ASSY.
1-32
Remedy
"Maintenance mode
Remedy
Remedy
Confidential
32". If

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