What is the meaning of Cartridge LED?

greenlight-jv34-260Green lighted This cartridge is currently supplying ink.

green-flashing-jv34-260Green flashing Within five months after the ink expiration date was extended.

red-flashing-jv34-260Red flashing This cartridge is “Near End”, “Ink End”, or “Expiration of a term of ink validity (one month)”.

red-light-jv34-260Red lighted This cartridge has an error such as ink level 0 (zero), no ink cartridge, and over 6 months after the ink expiration date was extended.

About the ink level 0 (zero) cartridge•••

When a near end or ink end is detected, the UISS function automatically switches the cartridges. For instance, if the Magenta Cartridge 1 detects the ink end during drawing, the valve is automatically switched to supply ink from the Magenta Cartridge 2. However, when you execute cleaning, by ink use-up cleaning function preferentially uses the cartridge with near end or ink end detected in order to save ink.
cardrigde-diagram-jv34-260
In the above diagram, the cleaning is performed using the ink remaining in the Cartridge 1. When the cartridge fully runs out of ink, it becomes an “ink level 0 (zero) cartridge.”