For the cable ensure it is supported by your OS and it has installation drivers, the ones without rarely work.

Install the driver as file and then change to the USB port once it has been installed.

Contact the RolandCare team on 01275 335540, they can send you a download of the latest version.

The report from the machine is a confidential part of the servicing, why do you need a copy?

You would need an engineer to perform the adjustment.

I would still look at changing the cap, their advice is a tad more expensive, meaning that you would need four flush cartridges and a new batch of ink.

Flushing at this point may cause more nozzles on other channels to block.

It looks like interference in the print, could possibly be the power adaptor, also check the USB cable is no more than 2 metres and you are running direct from the PC to the machine with no extensions or USB hub.

I would say it would likely have to be replaced as you have had issue previously with the magenta and the amount of nozzle dropout.

It could still be the head but the cap is the first port of call. Cleaning should be performed weekly.

You would need to perform a capping position adjustment on the machine, the cap unit is likely out of position causing the error.

It is still likely to be an electrical fault, it really depends what caused the fuses to blow, it could be a faulty cable, head or board.

Its probably down to the captop, the head is capping correctly causing the nozzles to block.

Also whiuch ink type are you running and how often do you manually clean?