Brother HL-2400C Service Manual page 277

Error Code
Erase Lamp (EL)
Concerned Part
Check the connection of the erase lamp connector.
Is DCN7 of IOD1 properly connected to the erase lamp ?
Is DCN1 of IOD1 properly connected with 11CN of MCTL PCB ?
Check the voltage (ELON-N/P).
Is the voltage between DCN7-11 and 9 a trailing edge ?
Is the voltage between DCN1-41 and 2 of IOD2 a rising edge ?
Is EL error cleared ?
YES
Finished.
EL
NO
YES
YES
NO
YES
NO
NO
Connect them properly.
Is EL error cleared ?
NO
Replace the LED PCB.
Replace the IOD1 PCB.
Replace the MCTL PCB.
IOD1
MCTL
11CN DCN1 DCN7
PGND
10
2
2
ELON-P
11
41
41
9
YES
Finished.
Relay Connector
Erase Lamp
+24V-1
1
1
ELON-N
2
EL
SGND 2