HP 220 User Manual
Page 44
5Ć12 Functional Overview
C3187Ć90000
Important Parameters
The geometry of the nozzle is important to maintain drop shape and direction. The distance
of the head from the writing surface can determine image sharpness. As the distance
increases, the drop shape and directionality degrade and are more difficult to predict.
Cartridge Chutes
The two black print cartridges snap into the cartridge chutes (carriage snaps).
Electrical Contact
A goldĆplated, dimpled flex circuit mates with the flat tab circuit on each cartridge to make
the electrical contact between the plotter and the cartridges. The elastomer spring pads
behind each flex circuit ensure the dimples contact the tab circuits with enough pressure.
Carriage PCA
The carriage PCA is part of the carriage assembly. It connects to the main PCA through the
trailing cable, which passes through a split torroid to reduce radioĆfrequency interference.
The Carriage PCA contains
D Line sensor
D Thermistor circuit
D Linear encoder
D Cartridge nozzle firing circuit
The thermistor circuit informs the carriage processor if the temperature of the carriage PCA
is above or below a certain value.
(Further information ' later in this chapter, w Carriage PCA.)