Mallinckrodt NELLCOR NPB-4000 Service Manual page 4

Contents
iv
Section 10: Introduction and System Description .................................. 10-1
10.1 System Overview ..................................................................... 10-1
10.2 System Block Diagram............................................................. 10-1
10.3 ECG Processing....................................................................... 10-5
10.4 Respiration Processing ............................................................ 10-6
10.5 NIBP Processing ...................................................................... 10-6
10.6 SpO Processing...................................................................... 10-6
2
10.7 Temperature Processing.......................................................... 10-6
Section 11: Isolated Front End Functions - Theory of Operation ......... 11-1
11.1 Block Diagram.......................................................................... 11-1
11.2 Overview .................................................................................. 11-2
11.3 Interface Circuit ........................................................................ 11-4
11.4 ECG.......................................................................................... 11-5
11.5 Respiratory Circuit.................................................................... 11-7
11.6 Temperature Circuit ................................................................. 11-7
11.7 Optocouplers ............................................................................ 11-8
11.8 Controls .................................................................................... 11-9
11.9 A/D Converter........................................................................... 11-10
11.10 Isolated Power Supply............................................................ 11-12
11.11 SpO Board ............................................................................ 11-12
2
11.12 Isolation .................................................................................. 11-12
Section 12: NIBP - Theory of Operation................................................... 12-1
12.1 NIBP System Overview ............................................................ 12-1
12.2 The Pneumatic Assembly ........................................................ 12-3
12.3 NIBP Hardware ........................................................................ 12-3
Section 13: Microprocessor Computer and Control
-Theory of Operation................................................ 13- 1
13.1 General..................................................................................... 13-1
13.2 Power Supply Connections ...................................................... 13-2
13.3 NIBP Processing ...................................................................... 13-4
13.4 Recorder Operation.................................................................. 13-5
13.5 Isolated Front End Interface ..................................................... 13-7
13.6 RS-232 Serial Port Interface .................................................... 13-8
13.7 CPU Connections..................................................................... 13-9
13.8 DRAM Control .......................................................................... 13-12
13.9 FLASH Control ......................................................................... 13-14
13.10 LCD Display............................................................................ 13-16
13.11 Real-Time Clock (RTC).......................................................... 13-18
13.12 DUART Control ...................................................................... 13-19
13.13 Knob Interface Control ........................................................... 13-19
13.14 Switch Control ........................................................................ 13-20
13.15 Miscellaneous Control - CS5#................................................ 13-20
13.16 Digital Schematic Figure 17-5 Through Figure 17-7 .............. 13-23
13.17 Current Drain Of Digital Electronics ....................................... 13-25
Section 14: Main Color Board Digital Theory of Operation ................... 14-1
14.1 General..................................................................................... 14-1
14.2 Power Supply Connections ...................................................... 14-3
14.3 CPU Connections..................................................................... 14-5
14.4 LNA 386EX Connections.......................................................... 14-7
14.5 CPU Timing Signals ................................................................. 14-7
14.6 DRAM Control .......................................................................... 14-8
14.7 FLASH Control ......................................................................... 14-10
14.8 LCD Display.............................................................................. 14-12
14.9 Real Time Clock (RTC) ............................................................ 14-15
14.10 DUART Control ...................................................................... 14-16