Section 3 —Theory of Operation
Page 3-2
VitalCare
TM
506N3 Series
Service Manual
Criticare Systems, Inc.
Electrical isolation of patient connections observes EN60601-1. To
this end, isolated DC power supplies are contained on the DOX SpO
2
and TurboTemp Technologies employing an adapter or isolation
boards: the Nellcor Carrier Board and the FasTemp
®
Isolation Board.
Additional isolation is incorporated through a medical grade
AC-to-DC power supply conforming to 4000VAC isolation and an
isolated supply for the external COM function. This supply conforms
to 4000VAC isolation.
The 506N3 Series consists of a modular architecture. The software
design supports this hardware philosophy by employing an RTOS to
simplify prioritization of the functions resident on the main processor.
Module Architecture
Main Board
(pn 91384A001/2/3)
The hardware design of the 506N3 Series monitor relies on multiple
serial communication channels wherein the Main Board functions as
the hub. Signal and display processing is off-loaded to the various
vital signs technology modules, the Display Board, and the LCD
Module. The Main Board collects the vital signs information, then
stores, formats, and outputs the data either electronically through the
external serial port or in hardcopy via the optional internal printer
module.
There is a power supply section of the Main Board wherein regulated
DC voltages are generated for various logic and analog functions as
well as the battery charging function.
Display Board
(pn 91388A001)
The Display Board contains all seven-segment LED displays and their
drivers. The Display Board connects to the Main Board via a dual row,
0.050-inch pitch stacking pin connector. Data to the displays is
transmitted serially in a synchronous manner.
LED DISPLAYS
Three 0.53-inch amber LED displays indicate the Pulse Rate. Two
0.53-inch green LED displays indicate the SpO
2
percentage with a
companion 10-segment green LED pulse bar. Two sets of three
0.53-inch red LED displays indicate Systolic (SYS) and Diastolic
(DIA) NIBP pressures. Three 0.39-inch red LED displays indicate the
Mean Arterial Pressure (MAP).
For units with optional temperature, five 0.39-inch red LED displays
indicate the temperature, with the right-most digit dedicated to
indicate C (Celsius) or F (Fahrenheit).
LED OVERLAY ICONS
Additionally, chip LEDs shall be used to illuminate front panel overlay
icons. These include icons for the Battery indicator, AC Power
indicator, No Sensor indicator, Alarm Silence indicator, and Patient
Size indicators. Units with the optional Temperature feature also have
Temperature Site indicators.
Summary of Contents for 506DN3
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