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I'm in the UK but am a tech and can help you remotely. Do you have a multimeter there or can you get one ( they are only cheap ). I do charge for this service to cover my time, but I can take you through testing the transistors if it helps

It doesn't look good, but to be honest on a floor tile nobody is ever going to look at it or read it anyway! Easy fix would be to paint a thin metallic silver line where the letters touch. Bear in mind the closest this sign is likely to be viewed from is 5 feet ( if someone is standing directly...

Definitely board replacement time I reckon. As Netsol said it may not even be a chip problem, it could be the traces inside the board and that is pretty much impossible to diagnose

No, roland sold out of them years ago and don't make new ones. There are sellers advertising new boards, but all of these are chinese copies that don't have a great track record of working properly

Although I do think the board probably needs replacing, but its always worth trying the cheaper easier options first just in case!

I have also found they can be a lot more stable if rather than running from a computer, through a router with other things connected and on to the printer, if you just use a dedicated pc or cheap laptop and connect the printer just to that via its network connection it can help. I run my VP300...

I think in most cases it is easier to get a replacement board. Once you have paid people to try various fixes it can be easier and a lot quicker. I know some have had luck with repairs, but it really depends on what is causing the problem. Heating and cooling can be a temporary fix, but once...

The VP does already have a case fan in it to cool the motherboard area

To be honest I have never had a problem with decals being easy to peel off, even with cheaper vinyl. I imagine they are just sticking them onto dirty surfaces which is causing the problem. Also this time of year metal can have thin layers of condensation you often can't see, which again will...

Yes I know the scenario all to well! Or people who have left the power on while the prod various parts or unplug things and short out things!

No, they don't go into that much detail. The manual is for Roland service technicians, they would just replace the whole board as they don't replace components. Have a look on youtube for videos of how to test transistors which will explain it. Its not that complicated to do, but you MUST do it...

I have a few in stock, all OEM DM me if you are interested and I can send pics. And yes, the solvent in the ink eats through the paint on them in seconds - I know from experience !!!

Hookers and coke?

You can get pretty much all parts for the 300i easily enough. If you can't get them new you can get tested used parts on ebay from a few sellers, so no need to get rid of it and upgrade. Heads will be available for them for years

Sadly they don't sell for much, but can be a complete bargain as you can still get all the parts for them - some new, and some tested and used, so can keep them going forever, and they are real workhorses and were better made than a lot of the later Roland models with dodgy boards etc... ! In...

Either your heads are not aligned to each other properly ( when they print the colours should line up with each other exactly so you get a sharp edge with no fuzziness or colours bleeding onto the white ), or you have damaged nozzles that are causing overspray. If you can let us know which...

They are basically hobby machines. They are ok if all you ever do is small items, but for 4K I would get something like a used SP540V or VP540V which are much better built and will give you a lot more scope. The other problem is they use the DX7 printhead. If they develop a fault you are looking...

Spray a bit of silicone lubricant where it attaches to the bar and move it left to right. They can get gummed up a bit and this normally solves it and stops them binding in the future

Electric heaters don't. Nor do all filled radiators. Nobody is suggesting the OP has open fires burning in their shop...

Export from Corel as a PDF. Some programs are weird with EPS files when they import them