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M3500B/M5500B Service Manual
Interface PCA
The Interface PCA performs the following functions:
Interconnection site for:
ECG leads cable and SpO
a.
All front panel keys.
b.
All front panel LEDs (Manual, Sync, Pacer).
c.
Ambient light sensor and IRDA interface.
d.
ECG analog front end for ECG from 3/5-lead cables.
Detecting and initial processing of front panel key presses, except for
keys OFF, 1, 2, 3 which only pass through the Interface PCA and are
detected and processed on the Control PCA.
SpO
on/off logic and patient isolation.
2
Interface for ambient light sensor.
Interface for IrDA module (used only in manufacturing at this time).
Power PCA
The Power PCA performs the following functions:
Analog front end for ECG from pads.
Measurement of Patient Contact Impedance (PCI).
Generation and control of pacing waveforms as directed by Control
PCA.
Control of defibrillator functions as directed by the Control PCA:
Charging the capacitor to the correct energy level.
a.
Delivering the shock and controlling the waveform.
b.
Disarming (discharging) the capacitor.
c.
SpO
PCA
2
The SpO
PCA serves as the interface to the SpO
2
Generation and control of voltages to drive the LEDs in the sensor.
Receiving and processing the signals from the SpO
PCA Descriptions
module.
2
sensor, including:
2
sensor.
2
6
6-3
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