Roche Diagnostics May 2009
D-70 Service Manual · Version 9.0
7 Troubleshooting cobas b 221 system
Value flag s
o Perform sample sensor test (SS2 and SS6). Press [Measure] and [Calibrate].
h [System] > [Component test] > [Control sensors] > [Sample sensors].
e
For instructions, refer to the cobas b 221 system Reference Manual, section
"Component test".
Flag no. 1051 "No AQC sample detected "
No sample was recognized at SS5.
Possible causes: o Sample path leaks or is blocked
o Incorrect AutoQC material assignment
Remedy: o Call up "Wash AutoQC".
o Check AutoQC material assignment (incorrect assignment of ampoules).
e
For instructions, refer to the cobas b 221 system Instructions for Use, section "Material
assignment – AutoQC materials".
o Check/replace AutoQC steel tube.
e
For instructions, see Replacing the AutoQC steel tube on page B-133.
o Perform sample sensor test (SS5). Press [Measure] and [Calibrate].
h [System] > [Component test] > [Control sensors] > [Sample sensors].
e
For instructions, refer to the cobas b 221 system Reference Manual, section
"Component test".
Flag no. 1052 "No vacuum"
No regulated low pressure could be build up during aspiration process.
Possible causes: o Defective vacuum system
o Incorrect Baro setup
Remedy: o Check Baro settings.
e
For instructions, see Baro sensor on page D-101, Baro settings on page B-5.
o Perform vacuum system test.
e
For the details, see Vacuum System on page D-101.
Flag no. 2004 "Repro. not ok"
Sensor signal cannot be reproduced.
Possible causes: o Invalid sample type used
o Measuring path contaminated
o Bubbles in internal electrolyte of the electrodes on the membrane
o Interference signals in the measuring path during measurement value acquisition
o Interference signals over the reference electrodes during measurement value
acquisition
o Loss of sensitivity of an electrode
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