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

(2)

Image reading system: Low image density

<Troubleshooting Procedures>
Step Check
1 Toner empty.
2 Defective PC Drum
3 Improper charging.
4 Poor image transfer.
5 Improper Print Head unit.
6 Are there no bent connector pins on the
cables connecting the control boards,
are all connectors correctly plugged in,
and are no cables broken?
<Sample of Image Quality Problem>
4011T003AA
Result
YES Replace the Toner Cartridge.
YES Replace the Drum Cartridge.
YES Replace the HV1.
YES Replace the Image Transfer unit.
YES Replace Print Head unit.
NO
T-29
Action
Correctly plug in the connectors.
Replace connection cables.