Main Control Part; Interface Part; Power Supply Part; Other Auxiliary Parts - EDAN M3 Service Manual

M3 Vital Signs Monitor Service Manual

2.1.2 Main Control Part

Main control board consists of Core board and Interface board. It has CPU/memory, display
circuit, network circuit and I/O interface. Main control board of the integrated board is used to
drive man-machine interface, manage parameter measurement and provide other specific
functions to the user such as configuration storage, waveform and data review, etc.

2.1.3 Interface Part

The man-machine interfaces are LCD display, recorder, speaker, indicator, keys and encoder.
The LCD display is the most primary output interface, displaying real-time or history data and
waveforms, various patient information and alarm prompts on the screen for the user's
observation.
Recorder is an auxiliary device to the display, which could print out various user-selected data for
use and preservation.
Speaker gives heart beat tone and audio alarm.
Indicator provides additional information about power supply, battery and alarm.
Keys and encoder are user-input interfaces of the monitor, user could input information and
instructions into the monitor by using them.

2.1.4 Power Supply Part

Power supply is an important part of the system, consisting of power board, power switch board,
battery and fan.
The main power board converts the AC mains supply into 5V and 12V DC to energize other parts
of the system. The power switch board can supply special power supply to LCD display. The
battery could maintain the formal function of the system for a short period when AC mains
supply is disconnected. A small fan requiring DC input is used to realize superior ventilation.

2.1.5 Other Auxiliary Parts

RJ45 on-line upgrade port is available on the monitor, which allows the service engineer to
upgrade the system software without necessarily opening the enclosure of the monitor. This port
is NET function.

2.2 Hardware Functional Principle

The following figure shows the hardware structure of the whole monitor as well as the connection
relationships between different parts. The board in the center of the figure is the core part of the
monitor, i.e., integrated board for main control and parameter measurement, which, though being
a single board, could realize the measurements of all the parameters; accordingly uniform A/D
conversion and digital processing system is used.
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