HP V8.5 - Manual (Page 45)

5
5 - 1 V8.5e Rev 2.2.2002
T H E O R Y O F O P E R A T I O N
5.1 INTRODUCTION
The V8.5e plotter uses thermal technology to convert data from the
host computer into plotted output. Host data enters the plotter main
logic circuitry via the data port, and passes through the interface to
the data buffer on the main logic board. Control and status signals
enter the main logic board at the same time as the parallel data. The
microcontroller converts the data from parallel to serial and sends
the serial data to the printhead. One horizontal line or scan, consisting
of a single row of dots, is plotted. The stepper motor advances the
paper for the next scan. This cycle repeats until the plotted or printed
image is finished.
5.2 PLOTTER FUNCTIONS AND FEATURES
Power supplies
The logic circuitry and printhead of the plotter are powered by a 5
Volt DC output power supply. The thermal printhead and stepper
motor are powered by a 24 Volt, 10 Amp DC power supply. Both
power supplies feature an auto-switchable input, which adapts to
different voltage or frequency inputs.