3 ] Head/Carriage Unit - Brother DCP6690CW Service Manual

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[ 3 ] Head/carriage unit

The head/carriage unit consists of a front end (ink-jet head) and a back end (damper and air vent

unit) as shown below.

The front end consists of metal plates laminated together and etched to form ink flow channels.

Piezoelectric ceramic actuators generate the spray pressure. The response of individual front

ends to applied voltages and waveforms varies, however, because of the nature of piezoelectric

materials, fluctuation in manufacturing accuracy, and other factors. The front end therefore

leaves the production line with head property labels giving property data. The manufacturer

writes this property data to the EEPROM on the main PCB incorporating this unit. Based on the

property data of the front end, the processor drives piezoelectric ceramic actuators to insure

consistent performance without fluctuations.

Metal plates

Nozzle plate

(Buffer and air vent unit)

(Ink-jet head)

Confidential

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