5-2 170 Series Monitor Revision C
2000947-004
Theory of Operation: Functional Overview
Functional Overview
For all 170 Series Monitors, the Main Board controls the majority of the 170 Series
functionality including:
antepartum (US, TOCO) front ends and connector(s)
uterine activity front end and connector
seven-segment displays
user-interface buttons
peripheral device communications
processing
For Models 173 and 174, a separate FECG/IUP Board controls:
intrapartum front ends
isolation for analog signals
Figure 5-1 provides an overview of the system architecture. Table 5-1 through
Table 5-17 provide pinouts for each of the external connectors and the internal main
board harness connectors. Figure 5-2 through Figure 5-9 provide illustrations of the
front and rear panel connectors.
Figure 5-1. Overview of System Architecture
MAIN BOARD
RECORDER MODULE
Printhead and Sensors
Sensor
Printhead
Cable
Speaker
Cable
Display Board
Display
Cable
Speaker
Cable
Membrane
Switch Panel
Membrane
Cable
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