Abstract: A screen printer prints ink on a plurality of substrates being carried by traveling pallets passing successively through printing stations. A manually operable controller is located at each printing head to operate position-controllable motors, such as stepping motors, to raise or lower a screen printing frame assembly to change an off-contact distance between it and an underlying substrate. A display at each printing head shows the relative distance being raised or lowered with operation of the manually-operable controller. Preferably, the stepper motors are positioned at the four corners of the screen printing frame. A common controller has a display for showing an operative or inoperative status of a screen printing head at each station and circuits to render the printing heads operative or inoperative. The controllers preferably are operably by a touch pad.