The new LLK cartridge I ordered (see the previous posting) arrived and has been installed. I ran a nozzle check and got the expected result, most of the LLK channel missing. I then did the usual standard cleaning of the LLK/Y pair, which as usual fixed the problem. I had one small print to make, did, and it looked great, also as usual.
A week later (yesterday), having four small prints to make, I started up and ran a nozzle check, found LLK mostly absent, cleaned LLK/Y and then got a perfect nozzle check print.
Clearly the new LLK didn't resolve the issue, leading to the obvious conclusion that something in the cartridge-to-nozzles path for that channel is failing. As long as I can get a good nozzle check I'll continue, expecting LLK to need a cleaning any time I want to print. I'll let you know if (when) things change.
--Jay
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