Image Reading System: Blank Or Black Prints - NEC NEFAX 671 Service Manual

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Image reading system: Blank or black prints

4011T035AA
<Troubleshooting Procedures>d
Step Check
1 Are there no bent connector pins on the
cables connecting the control boards,
are all connectors correctly plugged in,
and are no cables broken?
2 Defective CIS.
3 Improper charging.
4 Defective PC Drum.
5 Improper Print Head unit.
6 No Drum Cartridge.
7 No Toner Cartridge.
<Sample of Image Quality Problem>
Result
NO
YES Replace the CIS.
YES Replace the HV1.
YES Replace the Drum Cartridge.
YES Replace Print Head unit.
YES Install a Drum Cartridge.
YES Install a Toner Cartridge.
T-28
4011T036AA
Action
Correctly plug in the connectors.
Replace connection cables.