How to Refill HP Deskjet 6940 Cartridges
- 1). Take the empty HP 97 cartridge out of the HP Deskjet 6940 printer, and place it onto a surface protected from spills with paper towels or newspaper.
- 2). Peel off the HP 97 label on the top surface of the cartridge. Looking down onto the cartridge, you will notice five refilling holes. Only three will be utilized in this process. The refilling hole closest to the top center of the cartridge will hold the yellow ink, the refilling hole in the bottom left corner will hold the magenta ink, and the refiling hole in the bottom right corner will hold the cyan ink.
- 3). Fill one syringe with 6 ml of yellow ink, one with 6 ml of magenta ink, and the final syringe with 6 ml of cyan ink.
- 4). Insert the syringes into the proper refilling holes on the top of the HP 97 cartridge, and slowly release all of the ink in each.
- 5). Insert the filled HP 97 into the HP Deskjet 6940, and run a few cleaning cycles before resuming printing.
Source...