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5Ć27 Functional OverviewC3187Ć90000
FrontĆPanel Interface
The front panel consists of nine LEDs and eight switches. The servo processor interface to
the front panel consists of nine control signals and two sense signals.
StepperĆMotor Driver
The servo processor controls a stepper motor used for printĆcartridge servicing and
alignment.
CarriageĆProcessor Interface
The servoĆprocessor serial port is used to communicate with the carriage processor.
Sensors
Four sensors provide input to the servo processor:
D The
window sensor is a mechanical switch that detects if the window has been raised.
This serves the purpose of a safety interlock. While the window is raised, the servo
processor halts any carriage movement.
D The
media sensor detects the presence of media in the media path. It is also used to
determine media size.
D The
pinchĆarm sensor detects whether the pinchĆarms have been raised. The servo
processor uses the sensor to determine the pinchĆarm position during the initialization
sequence.
D The
bail sensor detects whether the bail has been raised. The servo processor uses the
sensor to determine the bail position during the initialization sequence.
EEROM
A serial EEROM is used as nonvolatile storage for calibration and configuration data. This
data is typically unique for the plotter. It includes the following information:
D RSĆ232 configurations
D Certain frontĆpanel selections
D PenĆpallet information
D Constants created during the various plotter calibrations
The EEROM is soldered to the Main PCA (both new and rebuilt). Should the EEROM be
cleared or the Main PCA replaced, perform all calibrations. (Details ' chapter 7.)
The servo processor drives the EEROM control signals, chip select and shift clock. A reset
signal disables the chip select during power transitions to reduce loss of data.