Printing: Epson 10600 wrong cartridge message

[yuvakt]

Now I managed to mix archival ink cartridge with UV ink cartridge. I am surprised that it is working. Let me explore how I did it.

Below is from Epson service manual:
When you insert Archival cartridge in to the 10600 designed for UV you get 'Wrong Cartridge' Message.
Turn off the printer. When restarting press
1. Adjust the Printers Ink Cartridge type information to match the Ink Cartridges that are installed.
1.1 Setting the NPD Value
1.1.1 Turn the Printer off.
1.1.2 Press and hold the [Paper Source] + [Cut/Eject] + [Paper Feed -] buttons then turn the printer on
and release the buttons when the VIEW COUNTERS MENU is displayed.
1.1.3 Press the [Select Type] button until you see SERVICE CONFIG MENU in the display.
1.1.4 Press the [Item] button until you see NPD= in the display.
There are three values that can be set for the NPD value they are:
NPD=0 Null - Not Dye or Pigment
NPD=1 Archival Pigment Ink
NPD=2 Dye Ink
NPD=3 UltraChrome Pigment Ink
1.1.5 If the NPD value displayed does not

I went and changed it to NPD=1. It showed 'Invalid Cartridge'.
I turned it off and turned it on following the same procedure as before.
This time I changed it to NPD=0
There was wrong cartridge message again.
Next I tried NPD=3 again. This time printer showed as ready and to my surprise Ink showed as usual in status monitor.
It started printing again and I have printed about 20 feet of 44" wide paper already and is still printing.
I don't know why it stopped recognizing the wrong cartridge.