A5/A3™ Service Manual 046-001141-00 1 - 61
Theory of Operation Ventilator Control and Drive
1.7.2 Ventilator Control and Drive Board
The monitor subsystem performs pressure and flow detection of the anesthetic ventilator and
anesthetic breathing system, valve control, status monitoring collection, O2 concentration reading,
accuracy monitoring of pressure and flow inside the circuit, and accuracy control of tidal volume. The
monitor subsystem is composed of four boards: monitor signal detection board, valve drive board,
ventilator sensor interface board, and VPM (auxiliary ventilator control board).
T16 15V2 15.2V Power Supply 14.44~15.96
T17 12V 12V Power Supply 11.4~12.6
T18 P15V Heater Power Supply 0~15
T19 LED_AC AC Indicator Light Drive Signal
With AC: 5~3.5;
Without AC: 0~0.4
T20 12V1 12V Power Supply 11.4~12.6
T21 12V2 12V Power Supply 11.4~12.6
T22 12V3 12V Power Supply 11.4~12.6
T23 7V 7V Power Supply 6.65~7.35
T24 LCD_EN LCD Backlight Enable Signal
High level 3.145~3.465; Low
level 0~0.3
T25 LCD_BR
LCD Backlight Brightness
Adjustment Signal
Brightest 0~1.5; least bright
4.75~5.25
DESIGNATOR NAME FUNCTION RANGE (Unit: V)
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