Resetting the counter tells the printer "The waste pad is empty." It does not physically clean the pad. If your printer has printed thousands of photos, the felt pads at the bottom are likely saturated with ink.
You have other options besides the adjustment program: epson adjustment program l850 new
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Searching for “Epson Adjustment Program L850” will yield dozens of results. However, you specifically need the “New” version. Here is why: Resetting the counter tells the printer "The waste