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Okay, so I think the issue is finally resolved. It did appear to be an upstream blockage. I simply removed the LK cart, replaced it with a cart full of Windex, then popped the LK tube off where it enters the damper and pulled the Windex through with a syringe. I let it sit for a day or two...

So after further usage, it seems that the head clean didn't solve the issue, and the LK is still problematic. I'll have a look at the needle frame assy next as everything is suggestive of an upstream restriction.

Ok, just reporting back here. So I pulled and cleaned the head & dampers. The head I let soak in Windex for a few nights, and also in The Pharmacist's Mix for a few nights. In all, it seemed relatively clean, certainly nothing like when I first cleaned it. All channels ran completely clean...

Thanks for the reply. So the printer had been sitting idle for large chunks of time after I acquired and 'serviced' it. For the recent in situ cleaning of the LK channel, I did do push/pull cycles, but I didn't really leave the Windex sitting for a long period of time. Actually, now that...

Hi all My 9600 seems to have intermittent issues with the Light Black channel. It tends to jump around from all nozzles working, to half working, to almost none working. Sometimes cleaning cycles help, but usually they make it worse. For example, I was getting near perfect nozzle test...