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Message
Alarm type/
Priority
Sustained
high
Paw
(5)
System
low
Leak?
Unable To
low
Drive
Bellows
(1.X and 3.X)
Vaux_ref
Minimum
Out-of-
Shutdown
Range
(6)
1006-0453-000
05/04
Enabling Criteria
Alarm Condition
Removal Criteria
In-range Paw data
Paw >= sustained limit
available
for 15 seconds.
In-range flow data
V
delivered
available
V
+ Pmax(CF)+0.3(V
TI
or
V
+ Pmax(CF)+200
TI
Where
CF = compressibility
factor = 10
Four consecutive breaths measured with "correct
volume" seen by flow sensors
In-range Paw and
Manifold pressure >
manifold pressure
Paw + 10 + 0.25⋅F
Where F
from the flow valve in
L/min
Alarm condition becomes false or transition from
mechanical ventilation on to off.
+5.8V out-of-range
Service Repair
Check absorber gage to see if the indicated
sustained Paw is present.
Check the breathing circuit.
Perform flow sensor calibration.
Check SIB to CPU cabling.
Replace the SIB board.
Replace the CPU board.
> larger of
Check flow sensors connections.
Check drive gas.
)
T
If Heliox is used, check that Heliox is selected
on the ventilator setup menu.
Check the breathing circuit and drive circuit.
Perform flow sensor calibration.
Replace the flow sensors.
Check SIB to CPU cabling.
Replace the SIB board.
Replace the CPU board.
Check the breathing circuit for leaks or hose
occlusions.
I
Perform flow sensor calibration.
= flow output
I
Check the drive gas check valve.
Check SIB to CPU cabling.
Replace the SIB board.
Replace the CPU board.
For machines with original CPU:
Check the 5.8 Voltage Test from service mode
under Display A/D channels. Verify that the
Counts value is between 1997 and 2565.
If not in range, measure the 5.8 V supply on
CPU board at TP8 referenced to ground at TP1
(4.99 to 6.09 volts). If this voltage is in range,
replace the CPU board because the problem is
in the A/D channel.
If not in range, (Refer to section 5.6.1)
measure the 5.8 V supply on Power Supply
board at TP19 referenced to ground at TP16
(4.99 to 6.09 volts). If not in range then
remove power supply to CPU cable and re-test.
If still not in range, replace the power supply
board.
If voltage is in range on the power supply
board, replace the CPU board.
For machines with Integrated CPU:
Replace the CPU board.
5 Troubleshooting
5-21
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Troubleshooting
