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SECTION 16: MP-205 SERVICE MANUAL (NPB P/N: 044540A-0296)
16. MP-205 SERVICE MANUAL
16.1 OVERVIEW
16.2 MODULE DESCRIPTON
16.1 Overview
16.2 Module Description
16.3 Circuit Description
16.4 Interconnections
16.5 Sensor Interconnect
16.6 Oxichip Circuit
16.7 Preamp
16.8 Programmable Gain Amplifier (PGA), Demodulator and Demultiplexer
16.9 Filters and Level Shifter
16.10 LED Driver
16.11 Reset Schmitt Trigger
16.12 High Resolution A/D Converter
16.13 Input Filter
16.14 Power Decoupling
16.15 Status and Timing
16.16 Analog Power Regulation
16.17 Microcontroller
16.18 Troubleshooting The MP-205
16.19 Packing for Shipment
16.20 JMP-205 Specifications
This section contains technical and service information for the Nellcor pulse
oximetry module, model MP-205. This product is to be serviced only by
qualified service personnel.
The MP-205 is a printed circuit module containing signal processing circuits
to measure oxygen saturation and pulse rate based on signals supplied by
Nellcor oxygen transducers (sensors) connected to the host system and applied
to a patient.
The MP-205 is built around an 80C552 microcontroller, and has been
implemented using low-power design techniques. The module consumes
approximately 0.5 Watts.
The MP-205 incorporates C-Lock
on patients with low perfusion, or in the presence of patient motion . An ECG
synchronization signal can be brought into the module via a hardwired
connection or a real-time software input. ECG synchronization processing can
be enabled or disabled by software.
The host system supplies analog outputs, parallel input/output, LCD display
drive, patient-isolated power, and alarms.
®
ECG synchronization to allow measurements
16-1
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Table of Contents
Troubleshooting
