| 摘要 |
By utilizing existing drive electronics for control electrodes, and then generating specific test signals to test different aspects of a printhead structure of a direct electrostatic printing device. The specific test signals in combination with ingenious measuring methods only necessitates a limited number of measurement points for the printhead structure. By activating a varying test signal, then a coupling to electrodes on the other side of the printhead structure can be used to verify that the control electrodes and the additional electrodes are physically unbroken and that the drive electronics is capable. By activating a test signal and at the same time measuring the current and/or power consumption of the drive electronics it can be verified that there are no short circuits of the control electrodes.
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