Siemens Servo i, Service Manual, Page: 50 / 70

Siemens-Elema AB
Troubleshooting Servo …
E382 E407E 061 01 01 02 6 - 6
6
Flow transducer test Checks the inspiratory flow transducer.
Calibrates and checks the expiratory
flow transducer.
Calibrates at 60% O
2
and checks at
100% and 21% O
2
. As different gas
mixtures are used during this test,
calibration of the expiratory flow
transducer will not be performed if one
gas is missing.
The new calibration factor for the
expiratory flow transducer may not
differ more than -10% to +15% from
factory calibration.
During this test, the different
subsystems concerned are compared.
The difference between the
subsystems must not be more than
±0.3 l/min.
(BRE + MON)
1. Check that the connected gas
supply pressure (Air and O
2
) is
within the specified range.
2. Check that the cassette is correctly
seated in the cassette
compartment. If possible, replace
the expiratory cassette and check if
the new cassette is accepted by
the Pre-use check.
3. Replace gas modules (Air and O
2
).
4. Replace PC 1771 Control.
5. Replace PC 1772 Monitoring.
Battery switch test If Battery modules are connected:
•
Checks that the power supply
switches to battery when mains
power is disconnected.
•
Checks that the power supply
switches back to mains power when
main is re-connected.
(MON)
1. Check that the total remaining time
for the connected battery modules
are >10 min. If not, replace the
empty battery with a charged
battery and repeat the test.
2. Replace PC1775 Plug-and-play
back-plane.
Patient circuit leakage
test Checks the patient circuit leakage, with
patient tubing connected, using the
inspiratory and expiratory pressure
transducers.
Checks that the leakage is less than 81
ml/min at 50 cm H
2
O.
Checks that the measured pressure
values differs less than 7 cm H
2
O
between insp. and exp.
Will allow the system to calculate a
compensation for circuit compliance (if
the leakage requirements are met).
(BRE)
If the internal leakage test (see above)
has passed, the leakage is to be located
to the patient circuit. Check for leakage
or replace the patient circuit.
Alarm state test Checks that no Technical error alarms
are active during the Pre-use check.
(MON)
Refer to section regarding Technical
error alarms for further information.