2-5 
 
2.3 Main Unit 
The main unit of the monitor consists of two parts: 
  Front housing assembly: main board, keypad board assembly (knob), display, touchscreen, alarm lamp board, 
power switch, and indicator board. 
  Rear housing assembly: power board (AC/DC), power management board, battery pad, interface board, recorder, 
speaker, and multi-parameter module which includes two types of SpO
2
 stacking board. 
 
The following figure shows the main unit architecture of the monitor. 
Wi-Fi
Antenna
MainBoard
PowerBoard
Battery
InterfaceBoard
Keypad
Board
Touchscreen
Control
Board
Touchscre
en
Display
Multi-parameterBoard
PowerManagementBoard
Recorder
SpO
2
Board
Speaker
AlarmLamp
Board
Parameter
Connector
Panel
InterfaceBoard