Might be cartridges are refilled.
You may got doubt why its not measuring the ink levels?. When printer found new catridge(printer/system based on design) will treats that new cartridge installed & estimated level will display fully.After couple of print outs printer/system will displays estimated ink levels depend upon the ink usage. But there is no mechanical ink level sensors or any other device for mesuaring the levels..Once the ink level trated empty you need to replace new cartridge straight away,if you refilled the same catridge it wont measure the levels, because of the cartridge data code already stored in printer. ..
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