Brother HL-3450CN Service Manual page 299

CHAPTER 8 TROUBLESHOOTING
Error Code
Concerned Part
Is a belt cartridge leaned to one side ?
Is a belt sensor stained ?
Confirm the connection of connector.
Is DCN16 of IOD1 properly connected with a connector of the sensor ?
Is DCN1 of IOD1 properly connected with 11CN of MCTL PWB ?
Check the voltage (+5V-1)
Is the voltage +5V between DCN16-2 and 3 of IOD1?
Is the voltage +5V between DCN2-1 and 4 of IOD1?
Is E9 error cleared ?
Job is complete.
E9
Belt Sensor (PBS)
NO
NO
YES
NO
YES
YES
Replace the belt cartridge.
Install the printer to be leveled out.
YES
Clean the belt.
Is E9 error cleared ?
NO
NO
Connect them properly.
Is E9 error cleared ?
NO
YES
Replace the belt sensor (PBS).
YES
Replace the IOD1 PWB.
NO
Replace the MCTL PWB.
MCTL
11CN
29
8-36
YES
Job is complete.
IOD1
13
DCN1 DCN16
5
PBSEN-N
1
PBSEN-N
+5V-1
29
2
SGND
3
DCN2
+5V-1
1
4
Belt Sensor
PBS
Sensor