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What is UISS (Uninterrupted Ink Supply System)?

The JV34 can utilize two cartridges per color in 4-color mode. This function allows one cartridge to automatically take over the other supplying cartridge when it runs out of ink.

This frees you from worrying about stop of printing due to out-of-ink during nighttime unattended printing*1.
(*1 … Still, be careful for the data that consumes lots of ink.)

The supplying cartridges are switched at the following timing.
[1] When “Ink End” is detected during printing
[2] When “Near End” is detected during ink charging
[3] When the ink cartridge is removed
[4] When there is an error on the ink cartridge
[5] When Ink use-up cleaning function is used

[About Ink use-up cleaning function•••]
During normal cleaning, this function preferentially uses a cartridge with “Near End” or “Ink End” detected, to save ink.

* If the supplying cartridge is removed during printing or cleaning, Using cartridge is changed but the operation stops.