I have a 4900 that slowly is getting less clogged. It was doing fine with an occasional minor clog and then the VM/C completely clogged. All other heads were fine, but in the process of cleaning, I screwed up all of the heads. The VM/C is now about 80 to 85% good, but there are other heads with varying degrees of clogs. The LLK/Yellow is the only set clog free now (that took some time), one or two spots on LVM/LC, the orange and green has the most missing, most in the orange (about 20%), and the PK/LK has about 5% missing. I have not recently changed to MK to see if it is the same and will try that. I have cleaned the capping station and the wiper with piezio flush, and have cleaned the bottom of the print head. I got a humidifier and have the room at about a constant 30% relative humidity. I have been doing regular paired cleanings, about 1 a day, and letting it sit. It has improved incrementally, but this is over a week with increased humidity (It was probably down about 10% when the problem started).
Most of the clogs are on the top of the page, in the same area, so I wonder if I got a head strike or fibers left behind on a towel wiping early on. It is almost a band across 4 or more colors as the spot that is missing on most heads. I run manual cleaning and turned off auto cleaning.
Do I run a complete head cleaning (all colors) or still try to do the paired colors, and do I do an execute powerful? I have done on execute powerful on orange/green, then let it sit, printed a nozzle check pattern (no change) and then later a regular clean, no change. I also have run a cleaning page, where the individual heads print the colors in one image. That seemed to get me a small improvement.
Would it help to scan a nozzle check pattern printout and upload it?
Is it possible to get just a paired set of cartridges to run such as the green/orange to fill with piezio flush? Do I run the adjustment program to fill only those two cartridges or will it then purge all colors? Not sure on the process.
Bill Bogle, Jr.