Well it seems quite ok to me at the first sight, but i think some thorough cleaning of the black head should do the job. If it was my machine and cleaning didn't help, i'd take a lint-free cloth and damp it with capping fluid or something and wipe the black head gently from below.

But indeed, the little bands in the M and C heads are weird. I don't think i have those. Have they always been there since you bought the machine or is it just now?

Yeah, the only possiblity is doing that in a wiper station. I guess unscrewing the side panel might help a bit, i don't remember now precisely. I know i did it when the black head got some fluff on the nozzle plate after we printed a lot of banner which was cut by us from a wider roll (so it had one side full of fluff, because we didn't have a hot knife or anything).

But also, i remember that Nigel and someone else here mentioned that there is a special cap that you can fill with some solvent and put under the heads to dissolve any stuck jets etc. Don't know the details of it yet (nobody showed photos here yet), i'm hoping the guys would be as kind as to say something about it. It was meant to solve all problems with heads (clogged nozzles).

I have had the 100s since around October of 2005. It has always had issues, this being one of them.

Banding can be an issue with the feed as well as the media meing used. Feed adjustment does help, but you will notice there will be a different amount of banding on the capping side vs the cleaning station side.

There is no way to get it out. The feed & takeout system on the 100s needs to be redesigned.