Brother HL-3450CN Service Manual page 289

CHAPTER 8 TROUBLESHOOTING
Error Code
Name of Part
Confirm the connection of Connector.
Is the connection proper between ECN3 of IOD2 and Solenoid (PSL YM) ?
Is the harness of Solenoid (PSL KY) broken ?
Check the voltage at (PSL YM) ON-N.
Does the voltage drop (
Does the voltage jump (
Replace current MCTL PWB with a new one.
D5
Developer Solenoid (PSL KY)
YES
+24V ) between ECN3-10 and ECN2-6?
NO
) between ECN1-5and ECN2-8 ?
NO
Is D5 Error cleared
YES
Complete
NO
Connect the harness.
Connect the connector properly
Is D5 Error cleared ?
NO
YES
Replace the front cover unit with a new unit.
YES
Replace IOD2 PWB with a new one.
Is D5 Error cleared ?
NO
NO
Re-check
MCTC
14
12CN
PSL(KY)ON-P
5
+24V-1
PGND
SGND
8-26
YES
Complete
YES
Complete
IOD2
19
ECN1 ECN3
+24V-1
5
9
PSL KY
PSL(KY)ON-N
10
ECN2
3
6
8