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

(5)

Image reading system: Black spots

<Troubleshooting Procedures>
Step Check
1 Is the document damaged or dirty?
3 Scratch on the PC Drum.
4 The problem has been eliminated after
performing step 3.
(6)

Image reading system: Blank streaks or bands

<Troubleshooting Procedures>
Step Check
1 Defective Print head unit.
2 Defective the PC Drum.
3 Defective CIS.
4 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>
4011T521AA
Result
YES Replace the document.
YES Replace the Drum Cartridge.
NO
<Sample of Image Quality Problem>
4011T015AA
Result
YES Replace the Print head unit.
YES Replace the Drum Cartridge.
YES Replace CIS.
NO
T-32
Action
Replace the CIS Assy.
4011T020AA
Action
Correctly plug in the connectors.
Replace connection cables.