GE Aestiva 5 Service Manual

							4 User Maintenance
1006-0939-0004-214-21
O2 sensor calibration - 100% O2 
Note: If w appears on the screen, the 21% O2 calibration must be completed before the 
100% O
2 calibration. Mechanical ventilation must be off to perform calibration.
This procedure takes three minutes or less. 
Step 1
Push the menu key.
Step 2
Turn the knob to select 
Setup/Calibration    
(highlight).
Step 3
Push the knob to show the 
next screen.
AB.29.003
AB29.002
AB90.036
AB90.037 
						

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Step 4
 
Turn, then push the knob to 
select O
2 Sensor Cal.
Step 5
Select 100%. Then, push the 
knob. 
Step 6
With the O
2 sensor in the 
circuit, fill the circuit with 
100% O
2:
•Push the flush button. 
•Then flow 100% O
2 at 
5 L/min. (circuit should 
be open).
Step 7
Select Start Cal.
Then, push the knob.
AB29.002 AB.29.046
AB90.048
AB.90.050
AB.90.088
AB48.081
  
						

							4 User Maintenance
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The screen shows “Calibrating . . .    
”, followed by the result (“Complete” or “Failure”).
If the calibration fails, 
•perform the calibration again.
•decrease the airway pressure, and repeat the calibration.
Before you use the system, complete the preoperative test procedure. Refer to 
"Appendix - Preoperative Tests" section of Part 1 of the Operation Manual. 
						

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 Flow sensor calibration
Minimum Frequency: Weekly
The system automatically corrects for zero offset when you unplug the flow sensor 
connectors with power on. You must stop mechanical ventilation before you calibrate the 
flow sensors.
Step 1
Push up on the latch under 
the flow sensor module.
Remove the flow sensor 
module. You will feel some 
resistance. Continue to pull.
Step 2
When calibration is complete, 
the screen shows, "No Insp 
flow sensor" and "No Exp 
flow sensor".
Step 3
•Install the flow sensor 
module.
AA.96p.010
No Insp Flow Sensor
No Exp Flow Sensor 
						

							4 User Maintenance
1006-0939-0004-254-25
How to prevent water build-up
wWW W W
AA A A
RR R R
NN N N
III I
NN N N
GG G G
During the cleaning of the liquid collecting tray, avoid skin or eye contact with the 
contents of the absorber. In the event of skin or eye contact, immediately rinse the 
affected area with water and seek medical assistance.
Why is water buildup a
problem?
Pooled water in the sensor or water in the sensing lines causes false alarms. 
How much water is too
much?A thin layer of water or a foggy look in the flow sensors is OK. Drops of water is too much.
Where does the water
come from?Water comes from exhaled gas and a chemical reaction between CO2 and the soda lime 
in the absorber. 
At lower fresh gas flows more water builds up because less gas is scavenged and:
•More CO
2 stays in the absorber to react and produce water.
•More moist, exhaled gas stays in the absorber.
Solutions•Drain the absorber each morning.
•Drain all hoses as necessary. 
•Flow sensor tubes must point up so that they do not collect water.
•With a circle breathing circuit, push the drain button before every case (listed in 
preoperative procedures).
•If Check Flow Sensors alarm occurs during a VERY LONG case, replace the flow 
sensors. Allow the original flow sensors to dry before you use them again. 
						

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							1006-0939-0005-1
5-1
5 Alarms and
Troubleshooting
wCC C C
AA A A
UU U U
TT T T
III I
OO O O
NN N N
No repair should ever be attempted by anyone not having experience in the 
repair of devices of this nature.
In this sectionAbout alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Alphabetical list   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Breathing system problems (no alarm)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Electrical problems (power failure, etc.)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16
Pneumatic problems   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18 
						

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About alarms
w WW W W
AA A A
RR R R
NN N N
III I
NN N N
GG G G
If an alarm occurs, safeguard the patient first, before troubleshooting 
or repair procedures. 
Two areas on the screen show alarms. The area at the top of the display shows 
most alarms. If there are more than 4 alarms at the same time, the lower priority 
alarms cycle every two seconds.
During severe malfunctions that prevent mechanical ventilation and/or 
monitoring, the area under the waveform shows minimum system messages. 
During normal operation, this area shows instructions (push the knob, etc.).
Alarm priority depends on the level of danger to the patient. High priority alarms 
require immediate attention.
AB.90.025
Alarms
Priority Alarm tone Alarm silence Note
High 10 tones, 
10 second pause, 
repeat120 seconds or 
cannot be silencedReverse video
Medium 3 tones,
25 second pause, 
repeat120 seconds ---
Low Single tone Tone does not repeat --- 
						

							5 Alarms and Troubleshooting
1006-0939-0005-35-3
Alarm messages have three general causes.
• Malfunctions: Some malfunctions cause reduced function (for example, no 
PEEP). Others prevent mechanical ventilation (Minimum shutdown).
•Patient monitoring: These are high and low limit settings that you adjust.
• Informational: Control settings or system conditions can change operation. For 
example, if the audible circuit leak alarm is Off, the screen shows “Circuit Leak 
Audio Off” as a low priority alarm. 
						

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5-4
 Alphabetical list
The instructions in this section tell you what you can do:
•During a case to protect the patient
•After the case to repair a problem
This table does not include operator instructions.
There are two special types of alarms:
•Minimum monitoring alarms stop mechanical ventilation.
•Minimum shutdown alarms stop mechanical ventilation and monitoring.
Message Priority Cause Action/Concerns Repair
+15V Analog Out-
of-RangeMin. shutdown 
(High)Ventilator malfunction. Ventilate manually. 
Monitoring is not reliable.Contact a qualified 
service 
representative.
-15V Analog Out-
of-RangeMin. shutdown 
(High)Ventilator malfunction. Ventilate manually. 
Monitoring is not reliable.Contact a qualified 
service 
representative.
12 Hour Test  Low System in use for more 
than 12 hours without a 
power-up self test.To do the test, move the 
system switch from Standby 
to On.Not necessary, 
informational.
A/D Converter 
FailureMin. shutdown 
(High)Ventilator malfunction. Ventilate manually. 
Monitoring is not reliable.Contact a qualified 
service 
representative.
Absorber panel 
openMedium The top panel is not 
completely closed.Close the panel. - - - 
Adjust Low Ve Limit Medium The audible circuit leak 
alarm is Off (Alarm menu) 
but the low VE alarm is not 
set.
VE alarm is Off in SIMV or 
PSVPro modes.Set the low VE alarm. - - -