I print mostly on matte paper, occasionally on glossy with my now seven year old Epson 3800. I just returned from a workshop with John Sexton and Charlie Cramer (excellent by the way) and since Charlie has measured deeper blacks with glossy or luster paper, I thought I'd run some of his favorite paper (Ilford Smooth Pearl) through the printer. I did a quick nozzle check and lo and behold there was virtually nothing coming out of the photo black nozzle. The printer had been idle for about 10 days and was off. I did a cleaning, both from the printer utility and from the printer, maybe a bit better, then it looked like the yellow was contaminated by the black. I did a super cleaning from the printer panel, better still. Then I made a print, huge black ink blobs along the right side of the print. I then tried the windex manuver, paper towel soaked with windex beneath the print head. It too helped, but then I needed to realign the printheads because of banding. I went in with q-tips, and windex and cleaned EVERYTHING I could see, perhaps most importantly the wiper. I gently injected windex where the head parks. Through all of this I went through almost an entire PK cartridge. In the end, happily, something must have worked because I can now print luster or matte papers with no blobs, and the nozzle check shows clean, nice yellows too. This is important since I'm working on aspens I shot in the Eastern Sierra.
I thought my printer was a goner. I thought about a repair but then figured I did not want to put serious money into a seven year old machine. The motto? I guess I was lucky. One of the websites I looked at had a link to the repair manual and it clearly says it has an service life of 5 years! However, it also mentions 12,000 A2 pages.