HP Indigo 7800 Working with Indigo ElectroInk Invisible Yellow for Indigo 7600 - Page 12

Troubleshooting, Check external UV light source.

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3 Troubleshooting Invisible Ink is visible without UV light: Contamination in the ink tank can result in higher visibility under regular visible light, creating a slight tint to the printed layer. In such a case, rebuild the ink after thoroughly cleaning the ink pathway, as described in Cleaning the ink station before building the HP Indigo ElectroInk Invisible Yellow on page 3. Figure 3-1 Invisible ink contaminated vs. correct working solution Weak signal under UV light source: Visibility under UV light can be affected by type of substrate, underlying graphics, and light source intensity and wavelength. We recommend verifying signal per design and substrate: ● Check external UV light source. ● Add additional hits to increase the intensity of the invisible inks. ● Rebuild the ink solution with a calibration can (make sure the can is emptied all the way). Troubleshooting 9

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Troubleshooting
3
Invisible Ink is visible without UV light:
Contamination in the ink tank can result in higher visibility under regular visible light, creating a slight tint
to the printed layer.
In such a case, rebuild the ink after thoroughly cleaning the ink pathway, as described in
Cleaning the ink
station before building the HP Indigo ElectroInk Invisible Yellow
on page
3
.
Figure 3-1
Invisible ink contaminated vs. correct working solution
Weak signal under UV light source:
Visibility under UV light can be affected by type of substrate, underlying graphics, and light source
intensity and wavelength. We recommend verifying signal per design and substrate:
●
Check external UV light source.
●
Add additional hits to increase the intensity of the invisible inks.
●
Rebuild the ink solution with a calibration can (make sure the can is emptied all the way).
Troubleshooting
9