Brother HL-2400C Service Manual page 282

Error Code
Concerned Part
Is the belt cartridge properly installed ?
Does the transfer drum rotate lightly ?
Check the connector.
Is DCN5 of IOD1 properly connected to the drum HP sensor ?
Check the voltage: +5V-1
Is the voltage +5V between DCN5-1 and 3 ?
Is the voltage +5V between DCN2-1 and 2 ?
Replace the low voltage power supply (LVPS).
NO
Is E3 error cleared ?
Finished.
E3
Drum HP Sensor
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Re-install or replace the belt cartridge.
Is the encoder plate deformed ?
Is the rotation torque excessive ?
Connect them properly
NO
Is E3 error cleared ?
Replace the drum HP sensor.
Replace the IOD1 PCB.
Is E3 error cleared ?
NO
Replace the MCTL PCB.
YES
Replace the transfer drum.
NO
Is E3 error cleared ?
YES
YES
Finished.
MCTL
IOD1
1LCN
DCN5
HPSEN-N
45
45
Relay connector
+5V-1
DCN1
1
HPSEN-N
DCN2
2
LVPS
SGND
3
ACN1
+5V-1
1
SGND
2
Drum PH Sensor
(EN)
1 1
2 2
3 3