Printer System: Low Image Density - NEC NEFAX 671 Service Manual

(10) Printer system: Low image density

<Troubleshooting Procedures>
Step Check
1 Is paper damp?
2 Is there toner left in Toner Cartridge?
3 Is PC Drum faulty (life)?
4 Is developing bias faulty?
5 Is image transfer faulty?
<Typical Faulty Image>
4011T003AA
Result
YES Replace paper for one just
unwrapped.
NO Replace Toner Cartridge.
YES Replace Drum Cartridge.
YES Replace High Voltage Unit
(HV1).
Replace Controller/Mechani-
cal Control Board (PWB-P).
YES Replace Image Transfer
Roller.
Replace High Voltage Unit
(HV1).
Replace Controller/Mechani-
cal Control Board (PWB-P).
T-35
Action