Hp 220 User Manual download pdf (Page 44)

5Ć12 Functional Overview

C3187Ć90000

 

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.

 

The two black print cartridges snap into the cartridge chutes (carriage snaps).

 

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.

 

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.)

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Hp 220 User Manual Page 44