NEC NEFAX 671, Service Manual

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T-37
(13) Printer system: Black streaks or bands
<Typical Faulty Images>
<Troubleshooting Procedures>
(14) Printer system: Offset image
<Typical Faulty Image>
<Troubleshooting Procedures>
Step Check Result Action
1 Is paper path dirty with toner? YES Clean.
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 the problem eliminated after checks have
been made up to step 3? NO Replace Controller/Mechani-
cal Control Board (PWB-P).
Step Check Result Action
1 Is Fusing Roller faulty? YES Replace Fusing Unit (Fusing
Roller).
2 Is Image Transfer Roller faulty? YES Replace Image Transfer
Roller.
4011T017AA 4011T023AA
4136T003AA
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