SOURCE: Please: Ink service module
try this remove the tank and soak in warm water. flush it out till it is clean. there iare no electronics on the tank so clean it and dry it and put it back in. (the tank is located on the bottom panel it looks like a battery compartment door) with tank reinstalled power on the printer push the cancel and resume button at same time and hold for 8 sec. then hold the power button down and tap the resume button 4 times. your printer is now reset and all the warning lights will go out either instantly or i have seen it take a few on-offs. hope it helps you out.
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