GE Corometrics 170 Series

5-18 170 Series Monitor Revision C
2000947-004
Theory of Operation: Main Board Theory of Operation
Figure 5-10. Main Board Block Diagram
Audio Module
 Audio amplifier
 Ultrasound volume controls
 ECG/alarm-tone volume
control
Status/Switch Input Module
 Front panel switch input
buffers
 Rear panel, recorder, and
front-end status buffers
Communications Module
 Quad async UART
 RS-232 transceivers
Display Interface
 Data buffers
 ESD protection
Recorder Interface
 Motor control latches
 Head control latches
 Status input buffers
 Printhead serial data link
Processing Block
 System processor
 System flash memory
 System boot flash memory
 System RAM
 System address decoder
PAL
 System battery RAM with
real-time clock
System Power Supply
 Pre-regulators
 +5 V regulators
 ±3.3 V regulators
 +7.5 V regulators (173/174)
 +24 V regulators
 +11 V regulators (173/174)
Uterine Activity Module
 Pressure differential
amplifier
 +4 V reference
 A/D converter
Ultrasound Module
 Ultrasound transmitter
 Control logic PAL
 Pin diode switches, pre-
amplifier, and demodulator
 Ultrasound envelope filters
 Ultrasound envelope
detector
 Audio frequency doubler
and filters
 Fetal movement bandpass
filters
 Telemetry multiplexor
 A/D converter
 Local voltage regulators
+12 V input
Interface to
FECG/UA Board
(173/174)