Hi,
You're experiencing the printer equivalent of a small child with a full nappy... The printer has reached a point where it believes that it's waste ink pads (again the nappy analogy) have filled with waste ink from cleaning routines, etc... so it's trying to tell you that it needs someone to change it.. Preferably a nice expensive Epson technician ;)
The good news is that this is probably one of the most documented issues in the Epson inkjet history and the fix is pretty simple.
You can take your printer to a service center and get them to change the pad over
OR
You can modify the printer to use an external waste tank (either a home made kit or one purchased on the web).
The instructions to handle the latter are available in various places and
this forum post links many of them together whilst also dealing with the method for resetting the waste ink counter which will clear the "Service required" error you're seeing now.
Hope that helps and if you hit problems, please ask again.
Best of luck.
r300 ink pad change
waste ink pad came out of printer
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