NEC Super Script 4400 Maintenance Manual page 256

Code Description of Error
Heater Fan(HTFAN)
F4
F5
High Voltage Unit(HVU)
Cause of Error
1. Loose/Broken connection
3. Defective Heater Fan
4. IOD1 Failure
6. MCTL PWB Failure
MCTL
11CN
PGND
2
HTFANON-P
49
1. Charger Unit Improperly
Installed
2. Corona Wire cut/shorted
3. C ontract failure of the high
voltage (CHV) output
terminal
4. C ontract failure or short of
CHV socket
5. High Voltage Unit(HVU)
Failure
6. IOD1 Failure
7. MCTL PWB Failure
MCTL
Clearance Method
1. Check the connections between:
a) DCN10 of IOD1 and the heater fan
b) DCN1 of IOD1 and 11CN of MCTL P.W.B.
3. If voltage between DCN10-4 and 5 is
rising edge then replace
3. If voltage between DCN1-49 and 2 is
rising edge then replace
5.Replace MCTL PWB
IOD1
DCN1 DCN10
HTFANON-P
4
12
PGND
5
49
HTFANERR
6
1. Re-install charger unit.
2. Replace the charger unit or belt cartridge.
3. Adjust contact to make proper connection
4. Clean the socket part.
5. Replace High Voltage Unit(HVU)
6. Replace the IOD1 P.W.B.
7. Replace MCTL PWB
IOD1 HVU
DCN14 BCN1
CHV
+24V-1
1
HV
CHVN-N
7
CHVERR
8
Service Error Codes
connector.
the heater fan.
the IOD1 P.W.B.
Heater Fan
HTFAN
Charger Unit
247