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Ensure that the ink tank is installed properly.
Open the Paper Output Tray and Top Cover, and then press on the 'PUSH' mark on the ink tank whose lamp is off until the ink tank clicks into place. Once the ink tank is installed properly its lamp will light red.

Properly inserted ink tanks
Ensure that all the orange tape has been peeled off as shown in (A). If a part of the orange tape remains as shown in (B), remove it completely.

(A) Correct (An L-shaped notch* appears on the ink tank.)
(B) Incorrect (Orange tape remains. Peel off the tape along the perforation.)
Replace any incompatible tanks with the correct tanks
Ink tanks used by the printer:
Black (PGI-220BK)
Magenta (CLI-221M)
Cyan (CLI-221C)
Black (CLI-221BK)
Yellow (CLI-221Y)