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This is most likely the flat cable going to the cutting head. It's a optical sensor on the back of the tool carriage.

I have seen it before. Try to do upgrade the firmware to the latest version. (The problem is, while it empties the tray, it also sucks ink from one head. If the dampers are not refilled in time, this error shows up. It's a firmware bug, that should be fixed in the latest version) If that doesn't...

There also is the ARP PING method, if you can't get hold of the Nettool software. There is a document describing it, that was supplied with the SP-540V.

Do a choke cleaning first. )Only available in service mode.) I service VS since they were introduced and only had one case, where a tube in the choke valve had a tiny hole.

This thermistor is only read from either head1, or the black head. I had a customer LEJ running with disconnected head5 for two weeks without error message in normal mode. (Fixed it yesterday)

When you look at it, neither Mimaki, nor HP lets the user service their products. The service modes are protected in both of them and/or you need software, that isn't officially available to users.

Sorry, but a in depht explanation would take too long here. (It's been written by others...) You also need a decent spectrometer and software. If you are willing to invest in that, you probably invested some time to learn the basics of profiling. There are books and online guides.

Looks like a electrical or timing issue. The linear encoder strip should definitely pass. Your test prints seem to have a feed problem. Check the feed encoder disk for ink stains and clean it. If a complete channel is missing and ink is flowing out the damper, when you suck with a syringe, or...

I'd say the printer works without the heads installed. The cartridges need to be installed for the chosen mode. Either CMYKWhWh or CMYKGlWh. I sometimes do tests with disconnected heads and it works. But I'm always in servicemode then. So I can't say, if it works in normal mode.

That's not that easy. Of course you need to profile both. But you also need to limit the density and chromacity of the "stronger" one to the abilities of the "weaker" one.

Has the installer done the M-Gap and horizontal adjustments in service mode? If you fail to do so, user mode m-gap doesn't work.

Look at the knife holder. Most of the time, they are the problem. You can try to lubricate, or replace it.

This manifold doesn't look like the one on Roland VS heads...

Have you adjusted the (feed)calibration? We had to replace heads on these machines because of so called microbanding. It could be media dependent.

What you describe, was a update, that is required for the old machines to recognise the cartridges with new chips. This update was looong ago... It doesn't give the now processing message, it just behaves, like there is no cartridge chip present.

Every other day is for white ink only. The other inks about once a week. I only saw problems with orange ink, when it sat in the printer for over three months without replacement or shaking. But I always set shake alert to on, to keep the colors consistent at all times.

While the VG had some quirks, these have been solved in the VG2 and VG3. The TR2 ink is very stable and you can laminate 6 hours after printing.

Set the media type from clear to opaque.

Up down is not a motor, it's a solenoid. If you move the knife up and down by hand in service mode, you should see the encoder value change. You could test the resistance of the coil.

I would check, if the sleeves over the manifolds are already mounted... otherwise the manifolds on the heads tend to break very, very easily.