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Check timing belt/pulley for jumping teeth. Make a mark on the belt and pulley in the parking position an let it print until the error happens and see, if the mark on the belt has moved.

Have you cleaned the belt pulleys?

This isn't HP's fault. Using expired inks is at your own risk. They even let you do it... don't cry. Mimaki stops working with expired inks for example. I had to replace many printheads on Roland UV printers because of expired inks. (One head is about the price of a complete set of HP heads)...

Double white is not possible. (Makes no sense, because it also needs to dry)

As far as I remember, Posterprint is able to to this for years. What is the version? 16 or 16?

That's the spectrometer. It falls off, because of material crashes. When missing, it throws a error during startup, as far as I remember. As long as you don't do color calibrations, it just sits there. I remove the left cover to replace them. Reseating the flatcable is a bit tricky, because the...

Sounds like your SSD went south...

Why not use the cut-off command?

The right to repair your own machine and warranty are two different things.

Looks like you had a crash(deflected nozzles on magenta an black in the same area). If manual cleaning of the nozzle plate doesn't improve your nozzle print, you may need to replace the head. Look at the service menu nozzle print, to see what the small dots look like.

Printing CMYK is possible with any firmware version. You just need to select double CMYK ink config. I'd save the actual parameters of the machine and do the update. If something doesn't work, I'd downgrade to the actual version and download the parameters. It's hard to say, if you particular...

On such a old geezer, there could be a pinhole in the tubing. (Roland suggests to replace it after 3000h printing time.)

This won't be possible with VW and this printer. What you need is a printer with LC/LM/LK. A VSi for example. If you want to finetune black generation and have (more important) dot size control, you need another full featured rip, that's probably more expensive, than a used VSi printer with...

The latest firmware is definitely compatible with Roland EcoMax2. No need to downgrade. 3rd party ink may be different.

I don't know, why it shouldn't be possible to switch back to Max2. The colors will definitely be off, with the wrong profiles.

Update to latest firmware.

It's almost always the SSR on the heater board. It's either constantly on, so the overtemp switch "regulates" the temp at 60-70 deg. Celsius. Or it is constantly off and stays cool.

Did you replace the damper? If a damper fill doesn't fix it, the damper needs replacement.

I don't think so. The Roland marks are generated by the printer.

What depht are you talking about? The smaller the drop size, the less distance between printheads and medium is possible. The drops are deflected by static or air draft and are shot at an angle because of the moving carriage. I don't know of a printer, that uses heads with very large drops nowadays.