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If you are getting the head from a Roland dealer then it is very unlikely to be defective. There are other companies that sell them like Digiprint who get seconds and they often have problems. It is common in most industries though that if you don't use their officially recognised techs to...

I have power sockets in stock if you need one

If you are sure you are not getting power to the board when you check the mains voltage then replace the mains input socket. It is possible this is making a bad connection. Swapping random things doesn't work, you need to be methodical and test from the mains input to the the output of the power...

Are you getting a DC voltage output from the power supply? If you are definitely not getting any AC voltage coming into the printer then it is either the lead or the input socket for the mains

You are reading the voltage in the wrong place. You need to test for DC volts on the output plug on the right hand side of the power supply and see if there is anything there. For the mains input you need to test for voltage between the live wire and ground. You need the black probe on the...

Note if the new supply is one of the cheap ones from china, then it quite possibly is faulty

It is possible the new power supply he has fitted is faulty, but he should have checked this when he fitted it. I have working tested OEM power supplies in stock if you need one

Have you measured the plug on the power supply to see if you are getting a 5V voltage from it?

When you turn the printer on are you getting a green light on the main board? If not then power is not making it to the board to boot it up

Did he change the power supply? That is weird if the printer was getting power into the main boards. It sounds like it could be the control panel has failed rather than the power supply. I have replacement control panel boards in stock if you need one. If you are getting a green light on the...

OK in that case it would point to your main board failing. Even though it is getting power it doesn't seem to be booting up

Did you replace the cable from the control panel to the mainboard as well as these can often go and give a fault as well.

Is most likely the control panel as we discussed previously. The printer itself is getting power fine or the main board wouldn't light up

If you need them I have the OEM linear bearings in stock

No, you can replace just the bearing blocks themselves, you dont need to replace the rail as well unless it is damaged or warped, which is pretty rare. Some people do suggest replacing the rail and bearings together, but I have sold lots of bearing blocks on their own to customers and none have...

Don't use 3 in 1 oil on the rail, The printers are designed to have the bearings greased, not the rail oiled. Oiling the rail can help temporarily, but isn't a proper fix Normally if the bearings are sticking you will get a scan motor error rather than the carriages disconnecting. I would...

Have sent you an email and a DM on here

You can't, you have broken the support plate so will need to replace it. I have complete wiper stations in stock if you need one

It looks like you may have had a head strike from how the test print is curving on the yellow and magenta.