NEC NEFAX 671, Service Manual

Page: 297 / 323

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