Printer System: Foggy Background; Printer System: Blank Streaks Or Bands - NEC NEFAX 671 Service Manual

(11) Printer system: Foggy background

<Troubleshooting Procedures>
Step Check
1 Is PC Drum scratchy?
2 Is developing bias contact terminal in good
contact with the mating part?
3 Is PH window dirty?
4 Is the problem eliminated after checks have
been made up to step 3?

(12) Printer system: Blank streaks or bands

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