Please see the attached document for the service manual regarding this product.
Changing the sintered filters: page 3
Software Version Check: page 4
Sensor adjustment (flow and O2 sensor): page 5
Flow Adjustment (AIR 10 Lpm, O2 10 Lpm): page 6-7
Pressure sensor adjustment (0 cm H2O, 60 cm H20): page 8
Expiration valve adjustment: page 9