NEC Super Script 4400 Maintenance Manual page 250

Code Description of Error
Developer Motor(DM)
E1
E2 Main Motor(MM)
Cause of Error
1. Defective toner cartridge/
developer gear unit and
motor
2. Loose/Broken connection
3. Defective developer
motor
4. IOD2 Failure
5. IOD1 Failure
6. MCTL PWB Failure
MCTL
12CN
11
12
IOD1
5
DCN9
8
LVPS
11
12
1. Belt cartridge Failure
2. Fuser Failure
3. Loose/Broken connection
4. Defective Main Motor
5. IOD2 Failure
6. IOD1 Failure
7. MCTL PWB Failure
SEE WIRING DIAGRAM ON NEXT PAGE
Clearance Method
1. Check for any unusual rotation noise while
printing then replace the suspected toner
cartridge. If the noise continues replace the
developer gear unit and motor.
2. Check the connections between:
a) ECN15 of IOD2 and the connector of
b) ECN1 of IOD2 and DCN9 of
c) ECN1 of IOD2 and I2CN of
3. Check voltages below:
a) +24V-1: between DM1-4 and 5,ECN15-4 and 5,
ECN2-5 and 8 . If not replace developer motor
b) +5V-1: between DM1-6 and 7,ECN15-6 and 7,
ECN2-11 and 12. If not replace developer motor.
4. Replace MCTL PWB
5. Replace MCTL PWB
6. Replace MCTL PWB
IOD2
DMCLK DMRDY-N
11 ECN1
1 1
DMON-N DMON-N
12 2 2
DMCLK
3 3
ECN
PGND
4 4
15
+24V-1
5 5
ECN2
SGND
6 6
+24V-1
+5V-1
7 7
5
PGND
NC
8
8
8
+5V-1
DMREV-N
9 9
11
SGND
12
1. Ensure that the belt cartridge rotates freely.
If not, replace the belt cartridge.
2. Ensure that the fuser rotates freely.
If not, replace the fuser.
3.Check the connections between:
a) ECN12 of IOD2 and the connector of
b) ECN2 of IOD2 and DCN9 of
c) ECN1 of IOD2 and I2CN of
NOTE: If any of the above connections are
defective replace the main motor.
4. Check voltages below:
a) +24V-1: between MM1-4 and 5,ECN12-4 and 5,
ECN2-5 and 8 . If not replace main motor
b) +5V-1: between MM1-6 and 7,ECN12-6 and 7,
ECN2-11 and 12. If not replace main motor.
5. Replace MCTL PWB
6. Replace MCTL PWB
7. Replace MCTL PWB
Service Error Codes
DM1.
IOD1.
MCTL.
DM1
DM
DM1.
IOD1.
MCTL.
241