http://www.dpreview.com/forums/thread/3530590I have the same exact issue that this thread explains. It is affecting the PBK, PC, and PM cartridges. Lower half of the Nozzle Check print out is missing on the PBK ,and 1/2 as dense on the PC and PM. The responder to the thread says it is an electrical issue, frankly I had come to this conclusion myself, cleaning the print heard ink wept freely from all of the heads.
I've cleaned the contacts on the back of the print head assy. And the spring leads on the print head carriage.
Anyone seen this before and know where to find the short? If I can't fix it I'll have to buy a new one... printer that is. I havenot found aftermarket print head, besides the short may not be in the head, so it would be a gamble to just replace it.
Thanks!