Epson printers like your model have a separate print head that needs to be changed periodically.
However, if you can remove it you might be able to clean it with running alcohol.
Thanks for your reply Phil,
I have sent off for a cleaning kit, to give that a try first.
If that doesn't work, then I will try what you suggested. I don't know if I would still be able to get a replacement print head, due to the age of the printer?