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Is the magnet screw well fixed?

HP Ink cartridges are under warranty until depleted or expired. Just return it to the seller. Check also the connector and electronic on the back of the printer. Could be ink on electronic or broken holder.

This is quite an oldtimer. Download a service manual somewhere and do the limit initialize.

Little bit Magenta + more yellow = orange…

Could be cross contamination through capping or damaged sealing inside printhead. Is ink also mixed in dampener? Check if capping pump is working.

Logically, the amount of ink printed has a direct impact on saturation and density. You would see it if there is a difference…

What a stupid question. Put the original file into the other RIP. Ripped files have resolution dependent pixel and color information inside prepared for the printer and printhead configuration. Sure, you will have color differences unless you do color calibration on both devices. Also, your...

But you don’t need to remove the cover, because you can disconnect cable at the line sensor. Unclip by pushing the connector frame upward.

In the ink window you can only see if reservoir is filled. OOI pops up if machine is applying power to recirc valve and pump (ink fill) but reservoir isn’t changing its filled-status after a while. Anything else doesn’t make sense in a logical way.

Check for carbon debris under white ink pump. This means that brushes are gone. Replace pump with new brushless type

You just have an ink pump problem or main ink filter is blocked. Or recirculation valve is not working. Machine doesn’t know ink amount. If pump is running certain time and reservoir isn’t filled software reports end of ink

As you can clearly see in your third picture one Black is not printing at all. Replace that printhead.

The above answer is completely correct. If you have installed the 257 ink in the proper way ink type should be set automatically with ink type specific voltage compensation and temperature. But you have to do the scanner alignment for good dot placement.

Sometimes the motor spindle breaks or carriage is under an angle blocking movement or one of the z-home sensors is damaged

Your left z-axis motor cause the issue. Try turning both of them to move carriage up and down easily. Could be motor problem or it’s control board.

Or buy a Durst where you are able to select if it should print matt or glossy, also selectable for special areas... But FB latex should be launched 2018, as far as I heard about. But you never now, HP is a marketing company. As long as there are rumors about, the market will wait with its...

I agree. Small text isn’t that sharp on Latex. So for small stickers it won’t be the solution. But for billboard / graphics it is the best. Odorless and reliable.

...when heating is activated

I’ve forgot: check rpm of coolant pump, visible in ink window. Should be somewhere around 5400.