Brother HL-2400C Service Manual page 264

Error Code
Developer Clutch (DCLC)
Name of Part
Check the Connector.
Is the connection between ECN14 of IOD2 and Clutch (DCLC) OK ?
Is the harness of Clutch (DCLC) broken ?
YES
Check the voltage at DCLC ON-N.
Does the voltage drop(
+24V )between ECN14-3 and ECN2-8?
NO
Does the voltage jump( )between ECN1-3 and ECN2-12 ?
NO
Replace current MCTL PCB with a new one.
Is D3 Error cleared ?
YES
Finished
D3
NO
YES
YES
NO
Connect the harness.
Connect the connector properly.
Is D3 Error cleared ?
NO
Replace the clutch (DCLC) with a new clutch.
Replace IOD2 PCB with a new one.
Is D3 Error cleared ?
NO
Re-check from beginning of section.
MCTL IOD2
12CN ECN1 ECN14
DCL(Y)ON-P
3 3
ECN2
+24V-1
5
PGND
8
SGND
12
YES
Finished
YES
Finished
+24V-1
1
DCLC
DCL(C)ON-P
3