Datex-Ohmeda Aestiva 7900 SmartVent, Service Manual

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4/Tests and Troubleshooting
4-40 1503-0151-000 5/26/0
beeping audio alarm can be silenced only by turning the ventilator
or anesthesia machine, as applicable, power switch OFF and after
five seconds back ON.
WARNING:
w w
w w
Manual ventilation must be performed when electrical interference caus-
es interruption of ventilator delivered mechanical ventilation. Manual
ventilation must be continued until the ventilator resumes normal oper-
ation or an alternated ventilator/anesthesia system can be used.
Troubleshooting by Alarm Messages
Alarm
Message/Symptom
Condition/Probable Cause Service Action
12 hour test 12 continuous hours since last
OFF state test Cycle mechanical ventilation ON
and OFF
Inspiratory Overshoot PAW is greater than Pinspired
threshold Change threshold
Pinspired not achieved Pmax does not reach a Pinspired
threshold 1. User may still have control of
actual Pinspired
(Conditions or combination of set-
tings may prevent ventilator from
achieving settings)
Refer to Pressure Sensitivity CAL
Fail listed in Section 4.
PEEP Not Achieved Pmin - PEEP is not within a spe-
cific window 1. Check tubing connections
Rate and/or I:E Ratio may prevent
ventilator from reaching desired
PEEP level
Heliox Mode is ON Heliox Mode selected Select only if using HeO
2
gas mix-
ture
VT Not Achieved VTI less than VT-threshold Preset tidal volume not achieved
Operator may still influence tidal
volume with settings
Refer to Pressure Sensitivity CAL
Fail listed in Section 4.
Bellows Empty Manifold pressure greater than
airway pressure plus threshold 1. Check fresh gas flow
2. Check and restore breathing
circuit volume, breath cannot be
delivered until bellows volume is
restored
Check O
2
sensor O
2
less than threshold (8% O
2
) 1. Calibrate O
2
sensor
2. Replace O
2
sensor
Circuit Auxiliary Use of auxiliary circuit in DCGO 1. Check dual common gas outlet
2. Check that auxiliary circuit is in
use