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This article explains what to do if you see sets of dots appear on your printouts. This print quality issue is known as traffic lighting, and can be identified as follows:
Traffic lighting can be caused by installing a toner cartridge incorrectly, where the locking mechanism scratches the drum of the photoconductor unit (PCU). It can also indicate a problem with the PCU itself, or with a hardware compnent.
|Figure 1||Figure 2||Figure 3|
Figure 1: Sets of CMYK dots appear in a single column.
Figure 2: Enlargement of Figure 1, with the CMYK dots circled in red.
Figure 3: Enlargement of CMYK dots. Note the four colours in each set of dots, in the order Black, Cyan, Magenta and Yellow.
In a Black & White print, only a black dot would appear.
Figure 4: Example of severe traffic lighting where the CMYK dots appear in a random pattern rather than in a single column. Note that your print sample may not show as many dots as this.
See the following related article for instructions: AcuLaser C1100, CX11N & CX21N: Manually removing and reinstalling the toner cartridges.
If so, contact Epson as your printer may require a service.
You will need to replace the PCU as well to resolve the print quality issue, but any hardware issues must be resolved first. Do not replace the PCU until the printer has been serviced.
The PCU is a user-replaceable, consumable product.
For handling and care instructions, see your user guide (available from the Epson website) or the following related article: AcuLaser C1100, CX11N & CX21N: How to remove and reinstall the photoconductor unit.
The photoconductor unit is a user-replaceable, consumable product. For instructions on how to replace it see your user guide (available from the Epson website) or refer to the following related article: AcuLaser C1100, CX11N & CX21N: How to replace the Photoconductor Unit.
However, if you have identified any other problems from Step 2, then contact Epson first for advice before you replace the PCU.
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