Ink Spray Function - Brother DCP6690CW Service Manual

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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

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