Brother HL-2400C Service Manual page 269

Error Code
Concerned Part Main Motor(MM)
Does the belt cartridge rotate lightly ?
YES
Does the fuser unit rotate lightly ?
YES
Check the connectors.
Is ECN12 of IOD2 properly connected with connector DM1 ?
Is ECN2 of IOD2 properly connected with DCN9 of IOD1 ?
Is ECN1 of IOD2 properly connected with 12CN of MCTL ?
YES
Check the voltage:+24V-1 and +5V-1.
+24V-1: Is there +24V between MM1-4 and 5, ECN12-4 and 5, ECN2-5 and 8 ?
+5V-1: Is there +5V between MM1-6 and 7, ECN12-6 and 7, ECN2-11 and 12 ?
NO
Replace the IOD2 PCB.
Is E2 error cleared ?
NO
Replace the IOD1 PCB.
Is E2 error cleared ?
YES
Finished.
E2
NO
NO
NO
YES
YES
NO
Replace the belt cartridge.
Replace the fuser unit.
Is E2 error cleared ?
NO
Replace developer gear unit and motor.
Is E2 error cleared ?
NO
Replace the main motor.
YES
Is E2 error cleared ?
Finished.
Replace the MCTL PCB.
YES
Finished.
YES
Finished.
Finished.
MCTL
IOD2
12CN
MMCLK
MMRDY-N
7
7
1
ECN1
MMON-N
MMON-N
8
8
2
MMREV-N
MMCLK
9
9
3
MMENC
10
PGND
10
4
ECN12
+24V-1
ECN2
5
IOD1
SGND
+24V-1
6
5
5 +5V-1
PGND
7
MMENC
8 8
+5V-1
8 MMREV-N
11
11
SGND
9
12 12
MM1
1
2
3
4
MM
5
6
7
8
9