The QuadTone RIP is Roy Harrongton's RIP, which is a $50 shareware program and used for making high quality B&W prints, this is what most people use to print with our Piezography K7 inks. The QuadTone RIP has a Calibration Mode feature, which allows you to control an individual channel, and can be a helpful way to flush or change inks in one channel without wasting ink in all channels at once, by following our instructions. If you are experiencing issues with one channel, and all the others are working well, then it would be more efficient and use less ink/flush to work on that individual channel instead of flushing all lines to try cleaning one.
After reviewing your order history, I noticed you purchased a set of refill carts and ConeColor Pro ink for your 4900 in July 2012. Please tell me, when did you begin having issues with the VLM channel? Did the clog start slowly as a few missing nozzles here and there until the entire position was blank, or did it occur suddenly? Did the clog occur during regular printing, or after a period of letting the printer sit unused? How often have you been agitating your carts and using the printer since installing the refill carts and CCP inks? What is the ink level of your VLM cart? Have you verified the air vent hole is open, cartridge contains enough ink, and exit channel is primed with ink for proper flow? Have you done paired regular and/or power cleaning cycles? What is the lot# of ink you're using (just for my records)? As you may be aware, there are an alarming amount of reports of clogging/flow and other mechanical issues with the 4900 and other newer printer models. We have several people every week who have only ever used Epson inks, contact us for help unclogging their printers- some are successful using our PiezoFlush solution, but some issues are mechanical and not resolved by cleaning.
Please let me know so I can try to help clear this clog and get your 4900 working well again.
Best regards~ Dana