Brother HL-3450CN Service Manual page 291

CHAPTER 8 TROUBLESHOOTING
Concerned Part Developer Motor(DM)
Is there any unusual rotation noise while printing ?
Confirm the connection of connector.
Is DCN9 of IOD1 properly connected with connector of DM1?
Is DCN1 of IOD1 properly connected with 11CN of MCTL?
Check the voltage: +24V-1 and +5V-1.
+24V-1: Is the voltage +24V between DM1-4 and 6,DCN9-4 and 6, DCN10-3 and 4 ?
+5V-1: Is the voltage +5V between DM1-5 and 9,DCN9-5 and 9, DCN10-7 and 9 ?
Error Code E1
NO
YES
NO
Replace the IOD2.
Is E1 error cleared ?
NO
Replace the IOD1.
Is E1 error cleared ?
YES
Job is complete.
YES
Replace the toner cartridge.
Is the noise cleared ?
NO
NO
Replace developer gear unit and motor.
NO
Connect the connectors properly.
Is E1 error cleared ?
NO
YES
Replace the developer motor.
YES
Job is complete.
NO
Replace the MCTL PWB.
8-28
YES
Job is complete.
YES
Job is complete.
DCN9
DCN1
MCTL
5
29
IOD1
11CN
DMRDY-N
DMCLK
1 1
6 6
DMON-N
DMON-N
2 2
2
2
DMCLK
3 3
PGND
4 4
PGND
5
5
+24V-1
6 6
+24V-1
+24V-1
3
7 7
PGND
SGND
4
8 8
+5V-1
7 +5V-1
9 9
SGND
9
DCN10
DM1
DM