Roche cobas b 221 system

Roche Diagnostics May 2009
D-74 Service Manual · Version 9.0
7 Troubleshooting cobas b 221 system
Value flag s
o S2 Fluid Pack docking mechanism contaminated
Remedy: o Call up "Fill reference electrode" for the relevant module.
h [System] > [Utilities] > [Fluid actions] > [Fill routines].
o Perform "Calibration for ready".
o Check S2 docking mechanism for contamination and if necessary clean it.
o Replace reference electrode.
o Call up "General fluidics test" and check that tubing paths are open and without
leaks, particularly the seals of the reference valves. h [System] > [Diagnostics] >
[General fluidics test].
o Insert electrode simulator and act accordingly.
Flag no. 2023 "1 point sensitivity drifts"
The 1 point sensitivity of the MSS sensor drifts.
Possible causes: o The sensor has not completed the startup phase and the 1-point sensitivity is still
strongly increasing.
Remedy: o Perform "Calibration for Ready".
Flag no. 2024 "Air bubble detected"
Before washing out the sample the conductivity value was not detected as pressure-
stable.
Possible causes: o A blood gas electrode has not filled bubble-free
o Leaky VBI
o Leaky sample path in BG
Remedy: o Call up "General fluidics test" and check that tubing paths are open and without
leaks, particularly the range VBI and BG measuring chamber.
h [System] > [Diagnostics] > [General fluidics test].
o Replace PO
2
electrode.
o Replace PCO
2
electrode.
Flag no. 2028 "Mean not OK"
Measurement value of calibration is outside the expected range.
Possible causes: o Defective electrode
o Incorrect Baro value
Remedy: o Call up a "System Calibration" for the relevant module.
o If only one electrode is affected, replace that electrode.
o If more than one electrode/sensor is affected, replace S2 or S3 fluid pack
depending on the module.