Before using the adjustment program, consider these alternatives:

When you launch the program (typically named AdjProg.exe or similar), it scans your computer’s USB ports for a compatible Epson L405. It sends a handshake signal to the printer’s firmware. If successful, the program reads the current waste ink counter value.

Epson printers are equipped with a maintenance box (or waste ink pad) located at the bottom of the device. During print head cleaning or power flushing, excess ink is drained into this pad. Epson’s firmware includes a that tracks how many times the printer has cleaned itself and how much ink has been dumped. Once this counter reaches a factory-set maximum (usually around 15,000 to 20,000 pages), the printer locks down. This is not a hardware failure—it’s a programmed safety measure to prevent the pad from overflowing and leaking ink inside the printer.

Only use an adjustment program explicitly built for the L405 or the exact compatible L-series family. Running a script meant for a different model can brick your printer's mainboard.

Ensure the checkboxes remain ticked, and now click the button.

Inkjet printers clean their print heads by spraying ink through the nozzles. This waste ink has to go somewhere. It is channeled through tubes into a porous pad located at the bottom of the printer, known as the .