I've got an old Epson Stylus Color 600. It's used often for B&W, but
rarely for colour. Last time I printed in colour it was OK, but this time
no cyan. I've replaced the cartridge and used the cleaning cycle with no
joy. Is it likely to be a blockage through lack of use or a faulty head?

Any tips on clearing the blockage if it is this?

I've got the service manual for it, and removing the head assembly is
easy. I'd be happy replace the head if it wasn't too expensive. The snag
with just buying a new printer is that I use it with my old Acorn computer
and most these days are USB rather than parallel. I know it's expensive in
ink, but I refill the black ink one myself, so this doesn't matter.

--
*If at first you don't succeed, try management *

Dave Plowman London SW 12
RIP Acorn