NEC NEFAX 671, Service Manual

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T-36
(11) Printer system: Foggy background
<Typical Faulty Image>
<Troubleshooting Procedures>
(12) Printer system: Blank streaks or bands
<Typical Faulty Images>
<Troubleshooting Procedures>
Step Check Result Action
1 Is PC Drum scratchy? YES Replace Drum Cartridge.
2 Is developing bias contact terminal in good
contact with the mating part? NO Clean contact terminal or
check terminal position.
3 Is PH window dirty? YES Clean.
4 Is the problem eliminated after checks have
been made up to step 3? NO Replace High Voltage Unit
(HV1).
Replace Controller/Mechani-
cal Control Board (PWB-P).
Step Check Result Action
1 Is Image Transfer Roller dented, scratchy, or
dirty? YES Replace Image Transfer
Roller.
2 Is PC Drum scratchy or dirty? YES Replace Drum Cartridge.
3 Is Fusing Roller scratchy or dirty? YES Replace Fusing Unit (Fusing
Roller).
4 Is PH window dirty? YES Clean.
5 Is the problem eliminated after checks have
been made up to step 4? NO Replace Controller/Mechani-
cal Control Board (PWB-P).
4011T004AA
4011T015AA 4011T020AA