Brother HL-3450CN Service Manual page 298

Error Code
Fuser Clutch(FUCL)
Concerned Part
Confirm the connection of a fuser clutch connector.
Is ECN9 of IOD2 properly connected with a connector of the clutch ?
Is ECN1 of IOD2 properly connected with 12CN of MCTL PWB ?
YES
Check the voltage (FUCLON-N/P)
Is a single voltage between ECN9-3 and ECN2-8 of IOD2 to be a trailing edge ?
NO
Is a single voltage between ECN1-20 and ECN2-12 of IOD2 to be a rising edge ?
NO
Is E8 error cleared ?
YES
Job is complete.
E8
NO
YES
YES
NO
Connect them properly.
Is E8 error cleared ?
NO
Replace the cleaner clutch(FUCL).
Replace the IOD2 PWB.
Replace the MCTL PWB.
IOD2
MCTL
ECN1 ECN9
12CN
14
20 FUCLON-P
20
ECN2
+24V-1
5
PGND
8
SGND
12
8-35
HL-3450CN SERVICE MANUAL
YES
Job is complete.
20
Fuser Clutch
+24V-1
1
FUCL
FUCLON-N
3