Hi. Scott here. I have been running a 7890 for 3 years now, at widely varying levels of activity. I have been out of operation for several months due to life, but I did maintain the ink flow with regular cleaning. I didn’t clean the flushbox enough I think, as ink had spilled down below the flushbox. I took the ink system box out (carefully, and with a mechanic’s eye), cleaned it (mostly some ink on the white gears), re-installed it and utlimately got a clean test print.
Recently a test print had little magenta, then no magenta. Subsequently I noticed the magenta feeder tube (in the bundle feeding the head) was empty. I assume that the line was blocked at the cartridge (or leaking?) I pulled the magenta cartridge and cleaned the printer nozzle/input with piezoflush.
What I need to know is: Can I charge just that magenta channel to fill up that tube without charging ink in the other channels? If it’s charging all channels, how much ink does it put through? Do I need full cartridges and empty maintenance tank?
My concern is that this printer is old, and this may be a symptom of something critical and killer, which leaves me hesitant to order more ink. But if I can get the magenta channel filled, I may just be a happy print guy. If the printer is horribly moribund, I will move on to another printer (some kind of mortgage involved, I’m sure 
)
I appreciate any direction from the experts 
That’s the dilemma about trying to bring back a printer: money spent to save or to waste.
If I thought that running individual channel power cleans was an alternative way to use the product I would instruct that. I have more data telling me that running Power Cleans when a print head has clogs will actually harm the print head.
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