Servo Processor System; Servo Processor; Processor Support Asic - HP DesignJet 200 Service Manual

Servo Processor System

The servo processor system consists of the following:
D Servo processor (8052)
D Processor support ASIC
D Front panel interface
D Stepper motor driver
D Carriage processor interface
D Various sensor inputs
D EEROM
To Main
Processor
System

Servo Processor

The servo processor controls all of the plotter actuators. Executing the commands issued by
the main processor, it reads the carriage and roller position from the processor support ASIC
and writes the needed control data to the PWM (Pulse Width Modulation) generators in that
ASIC. Through a serial link, the servo processor sends nozzle timing data to, and receives
carriage sensor data from, the carriage processor.

Processor Support ASIC

The processor support ASIC provides support for the servo processor, and an interface
between the main processor and the servo processor.
5 26 Functional Overview
Motor
Front-Panel
Position
Interface
Encoders
8052
Processor
Servo
Support
Processor
ASIC
Motor
Drivers
To Carriage
Processor
System
Servo Processor System
Sensors
Stepper-Motor
Driver
EEROM
C3187 90000