Roche Diagnostics May 2009
Service Manual · Version 9.0 D-61
cobas b 221 system 7 Troubleshooting
Value flag s
o Light level too low
o Pump delivery volume too high
Remedy: o Call up internal cleaning of the COOX module.
h [System] > [Wash & clean] > [Cleaning modules] > [COOX] > [Start internal
cleaning].
o Call up polychromator calibration.
h [System] > [Calibration] > [Polychr calibration] > [Start].
o Print the service report and check the "SS3-Hemo Pos. Time".
e
For the details, see Service report on page D-132
o Replace main pump tube.
e
For the details, see Replacing the pump tube on page B-67.
Flag no. 1008 "Irregular sample (2)"
The conductivity changed after closing the valve at the measuring chamber input.
Possible causes: o Insufficient wetting in measuring channel
o Separation of electrode membrane
o Leakage in electrode
Remedy: o Perform "Calibration for Ready".
h [System] > [Calibrations] > [Calibration for Ready].
o Perform a wetting routine for the relevant module.
h [System] > [Utilities] > [Fluid actions] > [Wetting routines].
o Check electrodes for leakage and if necessary replace.
o Check sample distributor-measuring chamber connection for leakage.
e
For instructions, see Sample distributor (SD) on page B-35.
o Test/replace measuring chamber inlet valve.
e
For instructions, see Replacing the valves from sample distributor cartridge and Hb
cartridge on page B-83.
Flag no. 1009 "Sample pos. error (3)"
The measuring signal was not constant or the measuring channel was not filled
homogeneously.
Possible causes: o Blockage or leakage
o Leaky electrodes
o Sample is fragmented
o Sample is unhomogenous
o Separation of the electrode membrane
Remedy: If discoloration can be detected by sample material in the internal electrolyte of the
electrode, it must be replaced.
o Call up "General fluidics test" and check that tubing paths are open and without
leaks. h [System] > [Diagnostics] > [General fluidics test].
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