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Print Engine Controller Having Controller Circuitry With An Open Actuator Test Circuit

  • US 20080278529A1
  • Filed: 07/29/2008
  • Published: 11/13/2008
  • Est. Priority Date: 10/10/2006
  • Status: Active Grant
First Claim
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1. A print engine controller for an inkjet printhead with a plurality of nozzle arrangements operatively actuated by thermal actuators, said controller having controller circuitry with an open actuator test circuit to test each respective actuator, the controller circuitry comprising:

  • an open actuator test input, a column enable input and a row enable input;

    a drive transistor operatively linking said thermal actuator to a power supply;

    a bleed transistor arranged in parallel with the thermal actuator;

    a sensing node; and

    a sense transistor operatively linking an output of the drive transistor and inputs of the thermal actuator and bleed transistor to the sensing node.

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