Everything prints too light
Even, all-over faintness usually isn't a blocked nozzle. Check whether draft or economy mode was left on from the last long document, and check the paper type in the driver matches what's in the tray, since the wrong setting lays down noticeably less ink. After that, look at the ink levels. On EcoTank models don't trust the on-screen estimate on its own, because it drifts over time. Look at the actual tanks through the window on the front.