Datex-Ohmeda S/5 monitors
Document No. 800 1009-1
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4.3
OM measuring unit troubleshooting
CAUTION
Because of the complex and very sensitive construction of the oxygen measuring
unit no repairs should be attempted inside the unit. Instead, if the fault has been
found in the measuring unit itself, the whole module should be replaced and the
faulty module be sent to Datex-Ohmeda for repair.
In cases of no response to O
2
or strong drift, check the tubing for loose connections, blockages and
leaks.
CAUTION
Never apply overpressure to the O
2
measuring unit as the pressure transducer may
be permanently damaged.
If the O
2
signal is noisy, check the measurement unit suspension.
4.4
TPX measuring unit troubleshooting
CAUTION
The TPX measuring unit can only be repaired and calibrated at the factory. In case of
failure the whole module should be replaced and the faulty module be sent to
Datex-Ohmeda for repair.
4.5
PVX measuring unit troubleshooting
In case of failure the PVX unit can be replaced.
NOTE: Never apply overpressure or negative pressure of more than 300 cmH
2
O to the flow and
volume tubing. Also never apply differential pressure of more than 25 mmHg on one PVX-
connection at a time.
4.6
CPU board troubleshooting
Due to the complexity of the large scale integrated circuitry there are few faults in the CPU digital
electronics that can be located without special equipment.
Check only that RAM, EPROM, CPU, and other socketed ICs are properly installed.
