NEC Super Script 4400 Maintenance Manual page 257

Code Description of Error
Fuser Unit
H0
(wire
cut/
short
error
of ther-
mistor)
H2, Fuser Unit and Others
H3,
H4
248 SuperScript 4400 — Maintenance Guide
Cause of Error
1. Fuser Improperly
Installed
3. C ontact failure due to
damaged connector of fuser
unit
4. Loose/Broken connection
5. Defective Fuser Unit
6. IOD1 Failure
7. MCTL PWB Failure
MCTL IOD1
11CN DCN1 DCN14
TH1
42
42
TH2
44 44
1. Input voltage
2. Fuser Voltage Rating
(110 or 220)
3. HP/HN connector not
connected
4. Fuser Unit improperly
installed
5. Fuser connector
damaged
6. Lamp Holder contract failure
7. Heater wiring cut or
damaged
8. Low Voltage Power Supply
Unit (LVPS) Failure
9. MCTL PWB Failure
Clearance Method
1. Re-installe fuser unit.
3. Replace fuser unit.
4. Check the connection between
and BCN2 of the high voltage unit (HVU)
5. Replace fuser unit.
6. Replace the IOD1 P.W.B.
7.Replace MCTL PWB
Fuser Connector
HVU
BCN2
TH1
TH1
16 16
1
TH2 TH2
18 18
2
1. Ensure the outlet is at the correct voltage
and amperage for the printer.
2. Replace the Fuser Unit with the correct unit.
3. Connect it properly.
4. Re-install Fuser Unit.
5. Replace the connector.
6. Replace the lamp and lamp holder.
7. Replace the heater.
8. Replace the Low Voltage Power Supply
Unit (LVPS).
9.Replace MCTL PWB
the fuser unit
Fuser Unit
3
4