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You are very welcome!

Your magenta/yellow head is failing. Time to replace it. No point in head soaking, as the magenta streaks in the yellow indicate the magenta channel is having firing issues, so the problem is electronic in the head, in my experience. Replace the dampers at the same time. You can go into service...

Also, never remove an ink cartridge from the printer with the power on, as it resets the front panel ink level counter. It will not cause any issues and will still stop when out of ink, but it will mislead you as to how much ink is remaining in a cartridge.

The fill test prints a color bar from each color individually, usually at a standard print setting. Not to be confused with an ink fill. Keep the existing cartridges in the printer. You'll see...

First, to start to isolate the cause, run the fill test in service mode and see what it looks like. Please post your results, along with a nozzle test print done immediately after finishing the fill test. Do not do a cleaning in between the 2 prints.

Does your printer show anything on the display when you try to turn it on? If not, check the main power fuses that feed the power supply. Be sure the printer is unplugged before doing this.

My mistake on the potential issue - the VP-540i uses the RS-540 mainboard, which does not have the same network issue as the VP-540.

I'm presuming you will do a power clean to charge the dampers. There are only 2 ways I can think of with the DX7 heads. One, while it is pulling ink (when the head is over the capping station), which for any air bubbles in the ink lines. I would shine a bright light on the lines at the print...

Just this... Not just DX7 dampers, but ALL dampers.

It's best to create only 1 post for an issue. Multiple posts for the same problem makes for confusion in solving your issue.

Please post a nozzle check.

Definitely sounds like the blade is not extended enough. The rule of thumb I use is the thickness of the media and a smidge more. A good cut should weed cleanly and there should be the slightest scoring on the backing material.

Here's a source for a good captop: https://www.solventinkjet.com/product-page/dx5-dx7-cap-top-for-use-in-roland-printers It is 3rd party, but these guys are techs and dealers and they rigorously test the aftermarket parts they sell. Probably the only place online I would trust 3rd party parts...

Your best bet is to post this in the Mimaki section in the Sign Equipment & Hardware part of the forum.

First thing is to get a Roland OEM cap. Until you have done that, in my opinion, you are wasting time.

FYI, it's not a good idea to start a second post on the same issue. The original post shows the continuity of the troubleshooting process. I'm only going to post future responses on the original post.

Is the cap a Roland OEM cap? If not, you should replace it.

Is the cap a Roland OEM cap? If not, you should replace it.

First, make sure the ink cartridge has ink in it. Been there, done that... Felt stupid... If you rely on the display, be aware if you have ever pulled the yellow cartridge with the machine on, this display resets to 100%. Along with this is the possibility the empty flag on the cartridge did...

The VP-540 has a known issue of the network section failing intermittently. When it happens, the printer will stop and you get a "Processing" message on the screen.