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You shouldn't need the peck tool for the VS-300i, the service menu isn't locked out on that one, you just need to know the button sequence to enter it.

There is certainly some issues with the K1 & K2 l, both C and Magenta M1 & M2 L Heads, probably what is causing the issues. Although I don't have a UV printer, I would imagine these would have a capping station like our Eco-Solvent Printers, what is the condition of it / them and how old?

What model are you using and can you post a Nozzle test print. Might be that the print head is starting to die or could be maintenance issues, hard to say without more information.

If the sensor didn't fix the issue, might be the board the sensor goes to.

You can power off and unplug the printer, move down the capping station and do a manual cleaning.

Understood. I wasn't certain. I guess VW5 is the only option then.

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Solventinkjet.com is an active trusted member here, so I doubt they'd sell you a used or refurb one. It's quite unlikely you'd get 2 defective heads at once. If you rule out the cables, my guess might be the board those cables go into.

Were they new, refurbished or used heads? That site you listed doesn't seem to work. One way to see if it is the cable is with the power turned off and unplugged, you can swap the cable going to the magenta head with the cable to the yellow head and see if that changes your results. If not, I'd...

Have you tried on Low head height. We can't use the high, as it doesn't print well for us, as we don't use thick enough media. You might be able to get more from the service menu, however if you have TR2 inks, you'll either need a tech with the peck tool and credentials or a "cracked" version to...

At least you have that going for you. I'd still make sure the heads are seated correctly, as this happened to me on my SG-300 a few years back and it turned out the tech hadn't quite seated it properly and once he realized and seated them, it looked better. Another thing is, is the head high or low?

Is that just a poor quality image or is the print out that blurry? Might also want to make sure the heads are seated properly.

I wouldn't recommend DigiPrint, they sold us a defective head and then wouldn't do anything, this was for our VS-300i, which uses the same head I believe. Unfortunately the heads for these aren't cheap, as it's a 1 head machine. If you do want to continue with a new Roland, I'd recommend the...

That is head damage, looks like there must have been a pretty decent head strike. Sorry, not sure why I didn't see that earlier. Unfortunately a new head would be needed.

To be honest, replacing the dampers on that printer, as it is just the one head, is probably one of the most pain in the butt machines to do it on and if the lines aren't cleared out and drip can blow the head. You could try attaching a syringe to one of the lines after the cap top and pinch off...

You can try a pump up. Just looks like the lines are dry. Alternatively, with the machine turned off and unplugged with the head in it's station, you can attach a syringe to the line after the cap top and gently pull ink through.

If they're coming back, I wouldn't say it's the print head, does sound a bit like ink starvation, could be the dampers or might be the cap top not having a good seal. When you lose the nozzles is there still ink in the lines?

I'd start by cleaning the encoder strip first, as I don't really see any deflection in the black nozzles, maybe a test strip in service mode with the smaller detailed view may show more.

No, it's not compatible, too old of a model, I believe Dual is the lastest Versaworks that can run the VS-640, only the vsi models can run of VW6.

As shown in your prints the black is out of alignment. If you can get your hands on a service manual for it, you might be able to make the changes yourself if it isn't due to dame to the head itself. Might want to take a look at the bottom of the head and see if you can see any visible damage...