Brother MFC 5890CN - Color Inkjet - All-in-One, Service Manual

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3-12 Confidential
[ 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.
Filter
Head driver
Metal plates
Piezo plate
Front end
(Ink-jet head)
Nozzle plate
Back end
(Buffer and air vent unit)
(Head)
(Front)