You ask questions for which I can only conjecture, and I don't do that. I can only say for sure what the manual says.
"EPSON P600 User Manual - page 137 Switching the Black Ink Type Switching the black ink type takes several minutes and consumes some ink in the process. Check the black ink type media list to select the correct type for the media you loaded. 1. Press the home button. 2. Press the black ink change button. 3. Select Proceed and select one of these types of black ink to switch to: • Photo Black to Matte Black—switching takes about 1.5 minutes • Matte Black to Photo Black—switching takes about 3.5 minutes" I would imagine that the two Black inks use the same feed lines in the head from this, and likely because of the added cost of doing independent feed lines (and whatever other complications that it might entail). But that's as far as I am willing to conjecture. I don't design this stuff, I use it. Far be it from me to tell the engineers how to do their job. I turned off autoswitching because I only rarely print on papers that don't take Matte Black ink and found that if I chose the wrong paper type at first then later changed to the correct paper type, the printer needlessly cycled back and forth wasting a lot of time and a bit of ink. G > On Jul 1, 2019, at 3:16 PM, Igor PDML-StR <pdml...@komkon.org> wrote: > > > Godfrey, > > That information that the printer has an ink-changing cycle is interesting. > But what is actually done during that cycle? > I assumed that having both blacks simultaneously spares you from any > ink waste, and what I am reading from your suggests (if I understood it > correctly), that could be a wrong assumption. > > But I am still curious, - what do they actually do? Purge the nozzles from > one black and initialize them with the other one? That would mean > that despite having both black cartridges installed at the same time, they > are multiplexing the head nozzles. > But why? Why wouldn't they have separate sets of nozzles, just considering > each black as a separate color (like they do for Light Black and Light-Light > Black [LK and LLK])? > > > Igor > > > > Godfrey DiGiorgi Sun, 30 Jun 2019 18:14:15 -0700 wrote: > >> BTW: the P600 ink tanks are much larger than R2400 and R2880. They're up in >> the 20-25 ml range. And the Photo Black and Matte Black inks are installed >> simultaneously … the printer will even change ink mode automatically based >> upon the paper you select, if you enable that option. (I don't, because it >> means more possibilities of an ink change cycle which takes time and costs >> ink.) I've found the P600's ink tanks and general economy in printing reduce >> the per print cost quite significantly over the R2400. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
