Brother HL-2400C - Page 271

VIII-25
Error Code
Concerned Part
Toner Sensor PCB (LED side)
E4
Check the connection of the toner sensor PCB.(LED side) connector.
Check the voltage(LEDON-N/P)
Is the signal voltage between DCN7-7 and 9 a rising edge(+24V) ?
Is the signal voltage between DCN1-29 and 1 a trailing edge ?
Is E4 error cleared ?
Connect them properly.
Is E4 error cleared ?
Replace the toner sensor PCB.
Replace the MCTL PCB.
MCTL
1ICN
1
29
SGND
IOD1
DCN1
YES
NO
YES
NO
Is DCN7 of IOD1 properly connected to the toner sensor ?
1
29
YES
YES
Replace the IOD1 PCB.
7
8
9
1
2
3
Toner Sensor P.W.B.
YES
NO
LEDON-N
7
8
9
DCN7
LEDON-P
TLSCHK
SGND
7
8
9
NO
NO
Finished.
Finished.