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Re: Colour change Issues - mainly on grays

#1 JLS a year ago

Hi All

I have been having some issues somewhat recently with colour matching. Around 4 months ago I ran off some pantone colour charts on the HP 310 latex. I am running Flexi Rip Basic software. Recently I have had the colours drastically change which I picked up when I was trying to match a gray for a new print to the printed chart. The colour was way off. I have run some off some new charts today and the colour is way off from the pantone matching book and way off from the original charts I printed. The original printed charts almost matched the pms book perfectly which is what you would expect. Something has gone far wrong. I performed a inkhead clean and plot test and all colour lines were showing, and then I ran a colour calibration. It is after this I printed the new colour chart. See attached pictures. As you can see the colour mainly affected is gray or shades of. They come out very green. What could possibly be causing this when the tests I ran come out fine? Could it be a bad ink. My black cartdrige is getting low and the LC has started to say it has expired, however all plots printed fine. I have noticed when colour starts getting low that there can be issues. It is all the same stock I am using for matching however I have also printed on different stock to prove it was not the stock.pms chart printed 4 months ago on LHS - pms book in middle and recently printed pms chart on RHSnot much variation on bluesvariation on shades of grayplot test fires perfectly on all heads

Solved! Go to Solution.

#2 JLS a year ago

Just to add to this, I have not changed anything in 4 months. I have replaced ink cartidges, however all the profiles used are exactly the same. Not even so much as changed any curing temperatures or vacuum presets on the profiles etc. I have not even changed or updated the firmware since the original colour charts where printed. All the same print heads as well. The weather has been relatively the same.

#3 HP-DianaPascual a year ago

Dear customer,

My name is Diana Pascual, Advanced technical consultant for latex. Let me make you few questions,

- could you please specify the model of your 300 series printer?

- have you ever used the CLC functionality, if so, how frequently?

thank you

Regards,

Diana

#4 JLS a year ago

Hi Diana

It is a 310 model. Not sure if there is any model code other than that.

Not sure what the CLC funtion is.

Sorry I am not up to spec on these things. I am 60% sure it must be a magenta head issue as there is definately magenta missing from the colour charts - that is what must make the gray....green.

However the ink head plot fired fine.

Thanks for your response. My HP distributer doesnt have a clue

#5 JLS a year ago

The printer is coming up on its 3rd yr of performing for us. Not sure why things have suddenly changed. I find with the printer that low ink levels affect the print. It might be the case here. Not sure.

#6 HP-DianaPascual a year ago

Hello,

thank you for your message.

Indeed magenta is missing.

Have you replaced the print head recently?

May I ask the name of your distributor please?

thank you

Regards,

Diana

#7 JLS a year ago

Hi Diana

I have replaced the magenta (one of them) approx 1 yr ago. Not replaced anything recently and the machine does not constantly run. I didn't think the colour change was an issue with the print head as the plot test seemed fine - all lines visible. Not even one missing.

Can I ask you could it be the print head when all lines are visible? Does that make sense?

Don't want to name my supplier atm as they always want to log service calls, come round and have no idea. I have actually showed them a few things. Last email I got from them was the same day I put a msg on this forum. They want to escalate it to the state manager - still no repsonse. The people that sell these machines and even the tech guys don't seem to have a clue. Pretty much it is a $300 call out fee just for them to scratch their heads. I know the technology is newsish, so that is the issue.

Would rather spend $300 on two new magenta heads than have them come out for the same cost.

#8 HP-DianaPascual a year ago

Hello JLS,

About the mangenta, is it clearly not firing, at least to generate the color. It can be that is only not working at 100%.

it should be compensated by the close loop color calibration. Please run it as follows:

- Check and clean

- Automatic PH alignment

- Close loop color calibration

Go to the settings menu (little gear icon) --> image quality there you will find all three options.

At the end, try to print again and tell me the results.

On regards your reseller, I do completely understand your feedback and I repect your decision. Where are you located?

thank you

Diana

Regards,

Diana

#9 JLS a year ago

Thank you for the repsonse Diana.

I will try this function in the morning and run more charts. Will let you know how it goes. Thank you for your time

#10 JLS a year ago

Hi Diana

Does not look like the 310 has this option on the menu. All it has is colour calibration, which has colour calibrate & reset to factor settings.

#11 JLS a year ago

I have resolved this issue. Since my model does not have the function you were mentioning (i take it that is for a different model), I chose to start replacing printheads at big expense. I replaced two magenta / cyan heads (one at a time and tested, then put two new ones in together) with no difference at all. I realised that it was happening on lighter colours / shades of gray that were missing magenta. So before I replaced the magenta ink, I tried replacing the light cyan / light magenta head next which resolved the issue. Colours are back to normal without a green tinge (funny thing is this head was one of the most recently replaced heads - I am guessing it dries out and does not fire at full capasity more than other heads as it does not have as much ink through it as the other heads...light cyan & light magenta ink cartridges seem to last a lot longer that full colours). Either that or it is in the firing range for head crashes on media as it is first in line??

I was not aware that failing heads (even though the head plot lines were all clearly visible) can not fire at full capasity.

You can see the difference with the light magenta on the attached pic on the print head auto alighnment test (which happens every time you try to replace a head) with the before and after print head replacement colour - the light magenta is darker after replacing the head.

Thought I would share for any others that are banging their heads against the wall or wasting money and media trying to find a solution.

#12 lerouxjul 4 months ago

I found exactly that ! It's due to Printhead printing temperature. If you print during long time, the heads are heating and light Magenta goes out a lot, but when they are cold, there is less light Magenta and then, you can see differences between start of printing and the end of print. The only solution is to replace PH by new ones. But you will see the problem again after few month printing with theses heads.

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

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