FUJITSU FI-590PRF - Manual (Page 12)

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8. Turn the lever on the print cartridge toward right
to fix it.
9. Close the imprinter cover.
10. Reset the Ink Remain Counter.
You must reset the Ink Remain Counter
whenever you replace the print cartridge.
c On the [Start] menu, select [Programs]-[Scanner Utility
for Microsoft Windows]-[Software Operation Panel].
d Select the [Device Setting] tab.
e Click the [Clear] button at the [Remaining Ink (Pre)]
button.
Ö The Ink remain counter will reset to 100%.