Datex-Ohmeda Aestiva 7900 SmartVent, Technical Reference Manual

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5 Troubleshooting
1006-0453-000 05/04 5-17
Memory
(RAM)
Failure
(7) Minimum
Shutdown
(6)
Walking pattern test
failure Replace the CPU board.
Memory
(Redundant
Storage) Fail Minimum
Monitoring
(8) (9)
Memory failure of
system parameter(s) Replace the CPU board.
Memory
(video)
Failure
(7) Minimum
Shutdown
(6
Walking pattern test
failure Replace the CPU board.
Monitoring
Only User Alarm A severe malfunction
prevents mechanical
ventilation. Other
alarms may also occur. Ventilate manually. Cycle system power (On-
Standby-On). If the alarm clears, restart
mechanical ventilation.
If persists, replace:
• CPU board
No Circuit
Module User Alarm The patient circuit
module is not installed. Install a module. Refer to the setup section.
Optical sensors look for tabs on the back of
the module. Is the module assembled? are the
sensors dirty?
If persists, check:
• Circuit Identification Board
• harness to SIB
• SIB
• cable from SIB to CPU board
No CO
2
absorption
User Alarm The canisters are open
(out of the circuit) but
the bypass mechanism
prevents a leak
(optional feature) User setting. Close the canister release to
remove CO
2
from exhaled gas.
No Exp Flow
Sensor medium
(1) No expiratory sensor
connected Check flow sensor connections for “No Flow
Sensor” alarm.
Replace expiratory flow sensors.
Expiratory flow sensor is connected
No Insp Flow
Sensor medium
(1) No inspiratory sensor
connected Check flow sensor connections for “No Flow
Sensor” alarm.
Replace inspiratory flow sensor.
Inspiratory flow sensor is connected
No O
2
pressure
User Alarm The O
2
supply has
failed.
Air flow will continue.
Ventilate manually if
necessary. Connect a pipeline supply or install an O
2
cylinder.
O
2
Flush
Failure
User Alarm The pressure switch that
detects flush flow has
seen a very long flush
(≥30 sec). This alarm occurs if you
hold down the Flush
button for more than 30
seconds. If persists, check:
• O2 flush switch
• cable to CPU board
Message Alarm type/
Priority Enabling Criteria Alarm Condition Service Repair
Removal Criteria