Brother HL-3450CN Service Manual page 287

CHAPTER 8 TROUBLESHOOTING
Error Code
Name of Part
Confirm the connection of Connector.
Is the connection proper between ECN16 of IOD2 and Clutch (DCLC) ?
Is the harness of Clutch (DCLC) broken ?
Check the voltage at DCLC ON-N.
Does the voltage drop (
Does the voltage jump (
Replace current MCTL PWB with a new one.
D3
Developer Clutch (DCLC)
YES
) between ECN16-3 and ECN2-6?
+24V
NO
) between ECN1-1 and ECN2-8 ?
NO
Is D3 Error cleared ?
YES
Complete
NO
Connect the harness.
Connect the connector properly.
Is D3 Error cleared ?
NO
YES
Replace the clutch (DCLC) with a new clutch.
YES
Replace IOD2 PWB with a new one.
Is D3 Error cleared ?
NO
NO
Re-check
8-24
YES
Complete
YES
Complete
IOD2
MCTL
14
15
12CN ECN1 ECN16
DCL(C)ON-P
+24V-1
1
1 1
DCL(C)ON-P
3
ECN2
+24V-1 3
PGND
6
SGND
8
DCLC