Image Reading System: Black Streaks Or Bands - NEC NEFAX 671 Service Manual

(4)

Image reading system: Black streaks or bands

<Troubleshooting Procedures>
Step Check
1 Is the document damaged or dirty?
2 Defective PC Drum.
3 CIS is dirty..
4 Defective CIS.
5 Improper Fusing.
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>
4011T017AA
Result
YES Replace the document.
YES Replace the Drum Cartridge.
YES Clean the surface of CIS.
YES Replace CIS.
YES Replace the Fusing unit.
NO
T-31
4011T023AA
Action
Correctly plug in the connectors.
Replace connection cables.