Brother HL-2600CN Service Manual page 313

Error Code
Concerned Part
Is a belt cartridge properly installed ?
Does a transfer drum rotate lightly ?
Confirm the connection of connector.
Is DCN4 of IOD1 properly connected with a connector of paper sensor (D.EN) ?
Check the voltage: +5V-1
Is the voltage +5V between DCN4-1 and 3 ?
Is the voltage +5V between DCN2-1 and 4 ?
Replace a low voltage power supply (LVPS).
NO
Is E3 error cleared ?
Job is complete.
E3
Paper Sensor (D.EN)
YES
YES
NO
NO
YES
NO
Re-install or replace the belt cartridge.
NO
Is an encoder plate deformed ?
Is a rotation torque excessive ?
NO
Connect them properly
NO
Is E3 error cleared ?
YES
Replace the paper sensor (D.EN).
YES
Replace the IOD1 PWB 2.
Is E3 error cleared ?
NO
Replace the MCTL PWB 2.
YES
Replace the transfer drum.
NO
Is E3 error cleared ?
YES
YES
Job is complete.
MCTL
IOD1
1LCN
DCN4
HPSEN-N
31
31
Relay connector
+5V-S
DCN1
1
HPSEN-N
DCN2
2
LVPS
SGND
3
ACN1
+5V-1
1 1
SGND
4 4
Paper Sensor (D.EN)
1
1
2
2
3 3