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The real question is: I have just acquired another second-hand iP4200, and its head is currently soaking away. Perhaps I may be able to restore it to life. PeterBJ's stamp test seems to suggest it's not the logic board that's at fault. Should I try inserting the 'new' head into my original...

And sorry guys if I seem to have confused you. The previous nozzle check image referred to what it looked like prior to soaking (when the funnel-shaped loss of ink occurred - stratman said he found it surprising that the could be loss of ink followed by a normal-looking nozzle check). After...

Well, mine is looking exactly like the first one: no PGBK stripe at all. The thing is, I soaked the bloody head this Tuesday (as per stratman's instruction). Following which it stopped printing PGBK altogether (instead of producing the funnel-shaped missing patches described above). And I did...

I am printing on Plain Paper setting, so it definitely is PGBK that's acting up. (I had been printing on Photo Paper setting the last time I thought my PGBK nozzles died completely (as documented earlier in this thread), and still so do from time to time now that they're once again not...

Bought an original PGI-5BK, inserted it, waited couple of hours just in case. No change.

Well, I've the same bottle of InkTec's PGBK and the same cartridge (the one that seemingly misbehaved in a similar way a year ago), so I could try to flush and refill. I also have an ages-old original cartridge that I kept in a plastic bag. The sponge hasn't dried. I could turn it into a...

The story continues... A year later the miraculously revived PGBK began to show signs of apparent clogged nozzles. Namely, printed plain text had some of the lines partially missing. Surprisingly, the nozzle check looked OK. OK, I though, I'll soak the printing head just in case (this time...

Guys, the most surprising thing happened. After months of forced dye-only printing, I decided to print the test sheet just in case (I just refilled the inks), and the PGBK part was back and perfectly OK!

How do I test the purge unit?

Thanks a lot! One more questions: is there some trick to trigger the photo mode (to print text with BK, bit PGBK) with anything lower than standard quality? To speed things up a bit.

Only for PGBK.

There is still PGBK ink left, sure. Much good it will make me now... Thanks a lot for tip no. 4! Still, what should have been the proper procedure in this situation? Just soak and let it dry? No cleaning sessions afterwards? Or, rather, seeing as there are lots of used 4200s floating around...

Here's how it looked before I tried soaking the head, and after.

here

And I already did a LOT of test prints in between the cleanings...

Oops indeed. Nothing to post, really - it's just an empty BK line, (no letters, no grid, nothing) followed by the rest of the colours intact.

Hi folks! I had a small problem with my InkTek replacement inks lately - that is, I've used the very last drops to refill my BK 'inkpot'. Should've said 'dregs', because the black nozzle immediately begun clogging up. After several deep cleaning sessions I decided to soak the printer head...

I pretty much knew what had been wrong before (half of my cyan nozzles not working). What does this new issue tell you of the exact problem?

An small update, if you will. Now my test prints look like this: Note the lower half of the letters. It used to be solid black not so long ago. Also, my full-size prints how have this wide-ish discoloured streak running near the bottom of the page: Could this be related to the previously...

Well, here's the service test print, if that's of any help. . As I've said, increasing colour intensity in print options solved the issue with regular plain paper prints. High-quality prints on photo paper show no signs of insufficient cyan intensity at all.