Brother HL-3450CN Service Manual page 302

F2
Error Code
Fan Motor (OZFAN)
Concerned Part
Confirm the connection of a fan motor connector.
Is ECN5 of IOD2 properly connected with a connector of the fan motor ?
Is ECN1 of IOD2 properly connected with 12CN of MCTL PWB ?
YES
Check the voltage (OZFANON-P)
Is the voltage between ECN5-1 and 2 to be a trailing edge ?
NO
Is the voltage between ECN1-19 and ECN2-8 to be a trailing edge ?
NO
Is F2 error cleared ?
YES
Job is complete.
NO
Connect them properly.
Is F2 error cleared ?
NO
YES
Replace the fan motor (OZFAN).
YES
Replace the IOD2 PWB.
NO
Replace the MCTL PWB.
MCTL
12CN
14
19 OZFANON-P
+5v-1
PGND
8-39
HL-3450CN SERVICE MANUAL
YES
Job is complete.
IOD2
22
ECN1 ECN5
Ozone Fan
OZFANON-P
1
OZ
PGND
2
FAN
19
OZFANERR
3
1 ECN2
8