A multi-orifice ink jet print head array (32) includes multiple drive circuits that drive respective PZTs (16) to cause ink drops to be ejected from respective orifices (28). Each drive circuit includes a voltage divider (36) having a resistor RS. The ink drop ejection velocity is controlled by selecting an appropriate value of RS for each voltage divider, thereby compensating for imperfections in manufacturing of the print head array. The value of a particular RS is selected by temporarily connecting the corresponding voltage divider (36A), in which the value of RS is RI, to assessment circuit (56). The assessment circuit includes a potentiometer (66) with resistance value RPOT. Ink drops are ejected at a rapid periodic rate as a camera (102) records the position of the ink drops with respect to a graticule (94) at the time a strobe (100) flashes. The value of RPOT is adjusted until the ink drops are on the graticule as viewed on a monitor (108), at which time RPOT = RT. RS is then laser trimmed by an amount RT, so that RS = RF, where RF = RI + RT.
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机译：多口喷墨打印头阵列（32）包括多个驱动电路，其驱动相应的PZT（16）以使墨滴从相应的孔（28）喷射。每个驱动电路包括具有电阻器RS的分压器（36）。通过为每个分压器选择合适的RS值来控制墨滴喷射速度，从而补偿打印头阵列的制造中的缺陷。通过将其中RS的值为RI的对应的分压器（36A）临时连接到评估电路（56）来选择特定的RS的值。评估电路包括具有电阻值RPOT的电位计（66）。当闪光灯（100）闪烁时，照相机（102）记录墨滴相对于标线（94）的位置，从而以快速的周期性速率喷出墨滴。调节RPOT的值，直到在监视器（108）上观察到墨滴在刻度线上为止，此时RPOT ＝ RT。然后用一定的RT量对RS进行激光修整，以使RS = RF，其中RF = RI + RT。
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