FIELD: instrument engineering. SUBSTANCE: electric signal is applied to potential terminal of each chosen resistor relatively the common bus. Polarity of the terminal is changed during each printing cycle once at least and/or during any subsequent cycle in relation to previous one. In such a way, speed of electric-chemical processes may be reduced in ink chamber at ink(electrolyte)-resistor boundary. EFFECT: improved reliability of operation of the head. 4 dwg
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