GE Corometrics 250cx Series Service Manual

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2-20 250cx Series Maternal/Fetal Monitor Revision C

2036947-001

Equipment Overview: Theory of Operation

Digital System Processor (DSP) Display PWA

The DSP Display PWA consists of two independent functioning modules: the DSP

and the Display interface. The DSP processes analog and digital data from the front-

end modules and interfaces to the main processor. The ECG and ultrasound analog

information is processed and heart rates are output to the main board via a shared

memory. Digital pressure information is received, processed, and also sent to the

shared memory. The Display section, consisting mainly of a shared memory and

timing generator, provides the interface between the LCD and the main processor.

Circuitry for the main processor to adjust the brightness of the LCD is provided

through a DC-to-AC inverter. RS-232 communications between the Main Board and

the UI keypad PWA are routed through the DSP board.

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