Datex-Ohmeda Aestiva 7900 SmartVent Technical Reference Manual page 135

Message Alarm type/
Priority
Positive SIB Minimum
Vref Out-of- Shutdown
Range
(6)
Pres Control low
Available
(1.X and 3.X)
Pres Control Medium
(Mode) NOT (pressure
Avail. control); else
low
1006-0453-000 05/04
Enabling Criteria Alarm Condition
Removal Criteria
SIB +12V supply voltage
out-of-range
V Compensation Off is
T
active
Alarm condition becomes false.
Ventilator not fully
functional and pressure
control mode not
available
Alarm condition becomes false.
5 Troubleshooting
Service Repair
First, verify that the +15V Analog Supply
Counts value is between1914 and 2262. If not
in range, see the +15V Analog Out-of-Range
alarm for diagnostics.
Then, check the +12V SIB Supply.
Verify that the Counts value is between 1779
and 2322.
For machines with original CPU:
If +12V SIB Supply A/D count is not in range,
measure SIB +12V on CPU board at TP9
referenced to ground at TP1 (11.4 to 12.8
volts). If this voltage is in range, replace the
CPU board because the problem is in the A/D
channel.
If the SIB +12V supply is not in range, remove
SIB to CPU cable and re-test. If still not in
range, replace the CPU board.
If voltage is in range on the CPU board, replace
the SIB to CPU cable or the SIB.
For machines with Integrated CPU:
If +12V SIB Supply A/D count is not in range,
remove SIB to CPU cable and recheck the
counts. If not in range, replace the CPU board.
If +12V SIB Supply A/D count is in range,
replace the SIB to CPU cable or the SIB.
Check the breathing circuit and flow sensor
connections.
Check the flow sensors for proper connection.
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 and flow sensor
connections.
Check the flow sensors for proper connection.
Perform flow sensor calibration.
Replace the flow sensors.
Check SIB to CPU cabling.
Replace the SIB board.
Replace the CPU board.
5-19