In the Printer, the Ink Cartridges reside inside the Ink Supply Station (ISS). The ISS is situated on the right hand side of the Printer and will be able to handle 69cc capacity Ink Cartridges (for all colors). The ISS is the part of the Printer that provides the pressure to pump the ink from the Ink Cartridges to the Printheads. It has a mechanism for each one of the four Ink Cartridges. Each mechanism consists of a spring that pulls from a rocker that pushes the lifter that pressurizes the bongo. There is a camshaft, which is driven by an electric motor, that moves the four lifters down pressing on the rocker. The ISS also has sensors which can detect when the pump chamber is empty and needs to be refilled (by pushing down the lifters).

The following diagram explains the operation of the ISS:

These are the key functions of the ISS:

Ink Cartridges support and location.
Prevents incorrect insertion of colors and inks.
Provides electrical connection to the Ink Cartridges.
Locates the supply end of the Tubes Assembly.
Contains ink from leaks.
Includes the ISS PCA which contains the backup EEROM.