MIMAKI UCJV300 Series Operation Manual page 14

Ink and other liquids used with this machine
Example: The expiration date is April 2020
May: Replace with new ink or use up as quickly as possible. Printing is possible.
June (Yellow LED illuminated): Replace with new ink or use up as quickly as possible. Printing is possible.
July (Red LED flashing): Printing is not possible.
• The message appears on the display.
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