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It could still be a transistor problem though, so I would test those next. It is a lot easier to do if you remove the board from the printer to do this

OK that is good as they have power going to them. You need to check the print carriage board as well, this is where the ribbon cables from the print head plug into

When you fit a new head it is always worth changing the cables as well as they are only cheap

They are a legitimate seller and a member on the forum. Lots of people on here have bought heads from them. If you install the head carefully and follow all the steps in the service manual you should have no problem with it. Generally Epson heads either tend to work fine from new, or not at all...

Although I have heard of people who have bought the cheap chinese heads, and they also had the magenta liquid but the heads didn't work !

Epson test them with water based inks, then they use a magenta coloured solution in the head for when it is in storage before being sold. It's not oil though, it is just like water. The temperature too low message is what happens when a black head is faulty. The printer reads the head...

That is a dodgy chinese seller, it is no wonder your head didnt work. I wouldnt have settled for a partial refund if it doesn't work! That is why it was half the price a working new print head would have cost. What they sold you is a used one they have flushed out that is untested and they just...

The print carriage board is above the print head, the head cables run from the heads to the carriage board. The servo board is on top of the main board. If you have a multimeter testing the transistors is pretty easy, there are plenty of videos on youtube about how to do it and you don't need to...

Did you power down, unplug and leave the printer for at least 15 minutes before removing the head cables? If not if the fuses didn't blow it could have caused damage to the transistors on the main board, or even the print carriage board. Did you check the tiny fuses on the main board? If you...

If they are selling them at $500 CD they obviously aren't a legitimate local seller. My guess is the chinese 'refurbished' print heads !

There is a used one on Ebay at the moment in the UK. AFAIK you can't get them new from Roland anymore, and when you could they were very expensive !

Where did you get a new head for $500 CD? Did you buy this from china, that is probably why it doesn't work. A new legit head would be more like $850 CD

It may be worth replacing the complete cutting carriage for one you know works then.

Some people are very hard to try and help :/

If the head is faulty internally there is no way you can repair them. I have taken apart faulty ones so know how they are made inside, and there is nothing you can do to fix them. Reading with a multimeter won't tell you anything useful. You can read all the resistors on top of the head, but...

No, you can't remove the circuit boards from the heads, the heads are made as one unit so can't be taken apart

Have you contacted the seller you got the head from? I agree with Jim. If the old head prints, but the new one doesn't then there is a problem with the new head. Did you get the head replaced by the seller or are you still working with the original one they sent you?

Or it could still be that head is faulty on the black channel

The temperature sensor is in the black head, so if the printer can't read it it comes up with the low temp warning.

Assuming the head isnt faulty, it definitely looks like you have a lot of clogged nozzles there. If the captop isn't sealing properly it can just make one colour dry out and the nozzles clog. I would try an overnight head soak and see if that helps at all in clearing it first