Epson inkjet printer incomplete, stripy printing. Air bubbles removing from dumpers

It's an Epson L210 printer, however the same procedure applies to L350, L351, L300, L301, L355, L358, L210, L211, L110, L111 printers too.
In my opinion, the print image problems are common at printers which have ink supply tank system, because a lot of air can accumulate in tubes and dampers. Air bubbles prevent ink from flowing. We can try the head cleaning and power ink flushing functions, but if they don't help, we should remove air from system manually. The lot of ink flushing moreover send a plenty of ink from all color to the waste.

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