5 Replacing major subassemblies
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Replacing the Main PCB
1 Remove the blower module, disconnecting the sensor tubes from both the sensors on the PCB
and from the blower module.
Note:
Remove the sensor tubes from the PCB by gently twisting and pulling upwards on the
tubes to ensure that the pressure ports are not damaged.
2 Disconnect the power supply and the humidifier interface cable.
3 Undo the screw securing the PCB to the bottom of the case.
4 Place a small screw driver under one of the front lock tabs and lift carefully while releasing the
lock tab.
Screw holding Main PCB
Humidifier interface cable
Location of lock tabs