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First time for me to experience this strange problem. I have applied various percentages of CMYK black from the CMYK color palette to some lettering & contours, and then when I click on them later it shows (in the bottom/right corner of the screen) to be a RVW color. No matter how many times I...

Yes, anything's possible. I did try straightening it and then using FMF, and I think I also increased the slant, but no luck. (My B&W sample here is rougher than the sample supplied).

The sample I was given had several repeated letters, and they all were identical, suggesting an actual font. I used FMF on my collection, as well as WFI and WTF. It's a strange one. Thanks for trying.

Thanks for the time spent so far, but it is certainly not one of those two.

Sorry for the poor quality of the sample. Any ideas?

Tech said this: "If it was a damper it would fade out. A good test would be a block of each color to see if anything drops out".

Hmm, ok, thanks for that; I'll run that by my tech and see what he says. When we replaced the head 9 months ago, he advised just leaving the existing damper in. It is nearly 5 years old, but not heavy use.

Interesting hypothesis. How would one test for that? If I apply, say, RVW-BK20A (95% black), it will pump out a bunch of black to achieve that, but still with the fine lines.

As you wish (although we're limited to 800 px wide here). I also just daubed the K head with a wet sponge cleaning tool; no change.

Yes, one wiper for each head. The machine actually turns on all by itself every ~8 hours and does a little clean. I never let the machine sit for more than 3 days without doing an actual print of C, M, Y, and K blocks to keep the heads happy. With my particular Roland (SP-540i) it's been...

I’ve double-checked the Feed Correction and Bidirection test prints, and they’re all perfect. I thought that the head might like to have some ink pushed through it, so I printed a 14” x 16” rectangle of just RVW-BK21A (which is K only), and that didn’t help. I wonder if I should gently place a...

Yup, bang-on.

Just for interests sake:

The feed calibration is bang-on, so would you suggest that noodling with it until it solves the problem be a good idea?

Yes, but I wouldn't say that it's "dead", just not quite 100%.

Thanks. Yes, given the higher carbon content of the black ink, that would be the likely issue, but it's odd that all the test prints are good & clean. One would think that if the culprit was indeed the nozzle performance, then one would see some deflections in the test print. I’ve just now...

Thanks for the reply. As I mentioned, the alignment test print is all bang-on, thus my confusion. OK, but if I've gone through the ones shown in the manual, what am I missing? It did print the RVW-BK grays properly after the recent head change, but now it's not. Nothing has been bumped; no...

Does anyone know what sort of warranty one has with a recently installed Roland head?

I should add, it prints a CMYK and RGB gray perfectly (although we all know that these are not neutral grays, and have green or pink casts to them). it's only on the more-neutral RVW-BK blacks/grays that the "banding" (for lack of a better term) occurs.

I'd have to look at the invoice (tomorrow), but I think it was replaced.