Ventilator Control and Drive Theory of Operation
1 - 70 046-006272-00 A7™ Service Manual
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, 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).
T14 5V 5V Power Supply 4.75~5.25
T15 3.3V 3.3V Power Supply 3.135~3.465
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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