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HP Latex 115 - Issues with black print / white spots

HP Latex 100 Series

#1 zarabates 3 months ago

We are having image quality issues when printing black on our HP Latex 115 printer. The substrate we are using in this example is ORAJET 3165, white gloss. It uses the HP certified profile from the online substrate library, and has been calibrated (under image quality maintenance).

The original file uses CMYK black with 50/40/40/100 to achieve a rich black colour. The CMYK black appears brown and does not print correctly. We have printed this colour on other machines without issues. Does anyone have experience with printing CMYK black vs. flat black? Other colours on the machine have been fine, but there is a lot of "coalescence" (refer to orange in test print).

We have decided to test print with flat black (100% black) which looks much better. Unfortunately there are white spots / flecks on the print. What is causing this issue and how can it be resolved?

Thank you in advance.

#2 dypinc 3 months ago

Sounds like it might be contaminated media. Try wiping an area with alcohol and see if that area has the white spots when printed. If it does then you should demand a replacement roll.

#3 HP-Sonia 3 months ago

If the Color Calibration test chart is printed with a good black, then the media is not the problem, unless the white spots are still there but you are not able to see them. Also, agree on cleaning part of the media with alcohol to see if we can rule out the media completely. To discard unexpected color management, remove the substrate profile and download it again. If the issue still persists, please call the HP support.

The opinions expressed above are the personal opinions of the authors, not of HP.

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