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I'm not sure, if it's a good idea to ramp up the power supply voltage. There are several voltages generated on this board. When I remember correctly, there is one big switching regulator that creates 5V from 41V and 5 or so linear regulators creating voltages lower than 5V. It's even possible...

Roland has/had the best and most detailed service manuals of all suppliers in this market. There is no way to troubleshoot boards like these in depht without specialized test equipment. (Think of FPGAs or microcontrollers with programmable pins... is it input or output?) I don't do component...

Interesting... But it is, as the seasoned guys tell you. It could be a bad solder joint or even worse a crack in a PCB track or even mor likely in a layer to layer connection. I hold a EE degree and even with a scope, it's just guesswork. You can check the onboard voltage regulators and so on...

You need to stagger them by so many pixels, as the manual says. It is important to check the top line of the test print with a magnifier. Otherwise it's easy to be a complete line to far off.

There is a NTC on the printhead PCB. If this reads too cold or has a connection problem(flat cables, connectors), you get this error. Are you aware, that there are two different types of flat cables used, to connect the printhead?

Bad seals are not very common. I had it twice now. There were problems with the dampers and when the head is used for a while, it wont seal anymore, when you replace just the damper. It's just something, you need to be aware of. You get service calls 0380 or 0400 during damper fill. The filler...

The seals are (stupdly) built into the heads on these machines. I just recently had to trash a perfectly working head because of this.

Why do you want to do it?

Looks like the original board has a USB problem. The crop sensor is a optical sensor on the tool carriage. I'd need to check the manual to see, if your cutter even has one. Check the new board for a dip switch and set it the same way, as on the old board. This could solve your problem.

Looks like contamination of magenta into the yellow channel. Since you have multiple units, you could swap maintenance cartridges to test. I have seen this after SMK3, after a buildup of ink on the maintenance cartridge.

You have to try. You can play around with the "camera profile" to better recognize problematic media. If you think the S2 Cam model is fast, you should see a S3 TC running...

November 1st 2021 is the manufactoring date. 18 months later, it was expired.(when i remember correctly with Roland Max2)

Try to get a Summa, you won't regret it. I installed/trained/serviced all the major brands in my career since 1988.(Started with Wild flatbeds and Aristo roll/sprocket cutters, later Zund, Roland PNC, then Summa, Mimaki, Graphtek, Kongsberg and GCC. Even some "can't remember the names" chinese...

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...