I’m in the process of getting my 7900 (with a mostly dead Green channel) loaded with my new PiezoPro inks. In my planning for this conversion, I made the decision to do a full PiezoFlush of the machine before loading the inks, and well, I have to say I am REALLY glad I did.
I loaded a full set of carts with PF and did the INIT FILL followed by a Nozzle Check. My nozzles were all good, but as I expected I did notice some staining. Since it is very difficult to really see the full extent of staining with a nozzle check print, I decided to run a 100% density print of all 10 colors together on one sheet (using QTR) and here is what I got:
There is obviously a LOT of color ink still in the system, and not just Yellow. I was especially surprised at how much Cyan and MK were still present. I knew that some staining was to be expected, but this much was not expected! In the image, the Orange bar is my target for all the other colors since I’ve had PF in that channel for some months now. The Green channel has also had PF in it for the same amount of time but it is slightly lighter because of the missing nozzles.
Having seen this, I will NOT proceed to load the PiezoPro inks until I see all pink on this print. I’m proceeding to run purge channel prints on the stained channels using the QTR calibration mode as documented on InkjetMall. So far it is taking a lot of printing to begin to see change towards pink, but at least I do see it slowly moving in the right direction. I may consider a 2nd INIT FILL with PF to move this along more quickly.
My take from this is that the staining topic is not given enough emphasis in the docs regarding printer conversion to Piezography. Yes, it is mentioned, but my experience suggests that you will have MUCH MORE staining than you might think. This also has implications for when the real inks are loaded and another INIT FILL is done to purge out the PF…I am expecting a LOT of printing with the new inks before I get rid of the pink!