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Air in ink tube - plotter is rejecting full cartridges

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Hey all,


The priter started to say LM cartridge is missing, even though it was full and working just before. 


When i replaced another cartrige, it did recognize the chip. But then after a short while said again LM cartridge was missing.


Theres allot of air in the tube.  I removed it but still after a while it stoppped printing LM and ruled out the new cartrige. 


How can i fix this? 


Thank u all


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its may be issue with firmware of printer. please check and upgrade the firmware.


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