The Epson L3210 is an all-in-one ink tank printer. Like all inkjet printers, it performs periodic cleaning cycles, flushing ink into a built-in . The printer tracks the pad’s saturation via an internal counter. When the counter reaches a limit (usually around 80–100%), the printer stops working and shows a “Service Required” error (e.g., blinking lights or error code). To continue using the printer, the counter must be reset.