Brother HL-3450CN Service Manual page 285

CHAPTER 8 TROUBLESHOOTING
Error Code
Name of Part
Confirm the connection of Connector.
Is the connection proper between ECN14 of IOD2 and Clutch (DCLY) ?
Is the harness of Clutch (DCLY) broken ?
Check the voltage at DCLY ON-N.
Does the voltage drop (
Does the voltage jump (
Replace current MCTL PWB with a new one.
D1
Developer Clutch (DCLY)
YES
) between ECN14-3 and ECN2-6?
+24V
NO
) between ECN1-3 and ECN2-8 ?
NO
Is D1 Error cleared ?
YES
Complete
NO
Connect the harness.
Connect the connector properly.
Is D1 Error cleared ?
NO
YES
Replace the clutch (DCLY) with a new clutch.
YES
Replace IOD2 PWB with a new one.
Is D1 Error cleared ?
NO
NO
Re-check
MCTL
12CN
8-22
YES
Complete
YES
Complete
IOD2
14
ECN1 ECN14 17
Developer Clutch(Y)
DCL(Y)ON-P
+24V-1
3 1
3
DCLY
DCL(Y)ON-N
3
ECN2
+24V-1 3
PGND
6
SGND
8