Contents - Novametrix Medical Systems OXYPLETH 520A Service Manual

PRELIMINARY
5-Jun-01
Low Battery Voltage Shutdown...................................................... 21
Timing Sequencer.......................................................................... 22
Data Sampling Controller............................................................... 22
Sensor LED Drive Circuits ............................................................. 23
Sensor Photodiode Return Path .................................................... 24
Calibrating the 20-Bit Analog-to-Digital Convertors ....................... 25
20-Bit Analog-to-Digital Conversion............................................... 26
Sensor Status Decoding and Conversion...................................... 26
Sensor Status Parameters............................................................. 27
Microprocessor .............................................................................. 28
Memory.......................................................................................... 28
Real Time Clock (RTC).................................................................. 29
Sound generator ............................................................................ 29
Keypanel Interface......................................................................... 30
Display Interface ............................................................................ 30
I/O Device Controller ..................................................................... 31
Watchdog Timer ............................................................................ 31
Serial I/O Controller ....................................................................... 32
RS232 Serial Communication........................................................ 33
Maintenance ........................................................................................ 35
General ................................................................................................ 35
Maintenance Schedules ...................................................................... 35
Cleaning and Sterilization .................................................................... 36
Model 520A Monitor....................................................................... 36
Finger Sensor ................................................................................ 36
Y-SENSOR™ and Y-STRIP™ Taping System.............................. 36
Battery Life and Maintenance .............................................................. 37
Mains Voltage Configuration ............................................................... 37
Fuse Replacement......................................................................... 37
Changing the Mains Voltage Setting ............................................. 38
AC Mains on older style assemblies.............................................. 39
Replacing the AC Mains Fuse(s) ................................................... 40
Changing the AC Mains Voltage.................................................... 40
Assembly Exchanges .......................................................................... 41
Changing System Software ................................................................. 44
Changing System Software on 2471 Main Board.......................... 44
Troubleshooting.................................................................................. 47
Functional Test ................................................................................... 51
Introduction .......................................................................................... 51
Monitor Functional Test ....................................................................... 51
Special Power Up Functions ............................................................... 53

Contents

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Model 520A Service Manual