Brother DCP130C Service Manual page 53

Ink spray function
The head employs drop-on-demand ink-jet printing.
Print commands to the drive circuit apply a bias voltage to the layer electrodes on the piezoelectric
ceramic surface stretching the elements perpendicular to that surface. Drive signals removing this
voltage for specific channel electrodes allow the piezoelectric elements to return to their original
shape, sucking ink into the corresponding channels*. Reapplying the bias voltage stretches the
elements once again, applying pressure to the ink, spraying it from the head nozzle. The ink drop
hits the paper on the platen, forming a dot.
* Pressure chambers for individual nozzles
Confidential
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