Brother HL-3450CN Service Manual page 305

CHAPTER 8 TROUBLESHOOTING
H0 (wire cut/ short error of thermistor)
Error Code
Concerned Part
Confirm the connection of a fusing unit connector.
Is the fusing unit properly installed ?
Is there any contact failure due to damaged connector of fusing unit ?
Are the connectors properly connected between the fusing unit
and BCN2 of the high voltage unit (HVU) ?
Replace the fusing unit.
Is H0 error cleared ?
Job is complete.
Fusing Unit
YES
NO
Re-install the fusing unit.
YES
Replace the charger unit or belt cartridge.
NO
Connect them properly.
NO
Is H0 error cleared ?
NO
Replace the IOD1 or MCTL PWB.
IOD1
MCTL
11CN
5 DCN1 DCN14
TH1
30 30
16
TH2
28
28
18
8-42
YES
Job is complete.
Fuser Connector
HVU
Fusing Unit
BCN1 BCN2
2
34
TH1
16
TH1
1
TH2 3
18
TH2
2 4