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You can download the Epson WFC5790 adjustment program from the following link:

The WF-C5790 is a high-duty all-in-one printer commonly used in small offices. Over time, its internal waste ink pads fill up. Once the counter reaches its limit, the printer locks itself and displays a "Service Required" message. The only way to reset this counter—without replacing the main board—is via the Adjustment Program.