Product: Epson EcoTank L6190 (Multi-function Inkjet Printer) Component: Maintenance Box (Sponge/Ink Absorber Pad) Part Number: T04D1 (also compatible with T6715 / C9345 depending on region) Issue: Printer displays “Maintenance box is full. Replace it and reset the counter.” (Error Code: 0x9D) 1. Purpose The Maintenance Box collects excess ink purged during print head cleaning, deep cleaning, and power flushes. The printer monitors an internal counter based on the number of cleaning cycles. Once full, the printer locks down to prevent ink overflow.