Brother HL-2400C Service Manual page 276

Error Code
Concerned Part Belt Sensor (PBS)
Is the belt cartridge leaning to one side ?
NO
Is the belt sensor dirty ?
NO
Check the connector.
Is DCN11 of IOD1 properly connected to the sensor ?
Is DCN1 of IOD1 properly connected with 11CN of MCTL PCB ?
YES
Check the voltage (+5V-1).
Is the voltage +5V between DCN11-2 and 3 of IOD1?
NO
Is the voltage +5V between DCN1-5 and 1 of IOD1?
Is E9 error cleared ?
YES
Finished.
E9
YES
YES
NO
YES
YES
NO
Replace the belt cartridge.
Level the printer.
Clean the belt.
Is E9 error cleared ?
NO
Connect them properly.
Is E9 error cleared ?
NO
Replace the belt sensor (P.B.S).
Replace the IOD1 PCB.
Replace the MCTL PCB.
MCTL
11CN
SGND
1
+5V-1
5
YES
Finished.
IOD1
Belt Sensor
DCN1 DCN11
PBSEN-N
1
1
+5V-1
P.B.S
2
5
Sensor
SGND
3