Roche cobas b 221 system

Roche Diagnostics May 2009
D-88 Service Manual · Version 9.0
7 Troubleshooting cobas b 221 system
Value flag s
Flag no. 8077 "IfS ADC >>>>>"
Interference sensor signal is above/below ADC range.
Possible causes: o Reference system not filled
(reference electrode only for instruments with urea installed)
o Leaky/empty electrode
Remedy: o Call up "Fill ref. electrode MSS".
h [System] > [Utilities] > [Fluid actions] > [Fill routines].
o Perform "Calibration for ready".
o Check electrode seating.
o Replace MSS cassette.
o Insert electrode simulator and act accordingly.
Flag no. 8078 "IfS ADC <<<<<"
Interference sensor signal is below ADC range.
Possible causes: o Reference system not filled
(reference electrode only for instruments with urea installed)
o Leaky/empty electrode
Remedy: o Call up "Fill ref. electrode MSS".
h [System] > [Utilities] > [Fluid actions] > [Fill routines].
o Perform "Calibration for ready".
o Check electrode seating.
o Replace MSS cassette.
o Insert electrode simulator and act accordingly.
Flag no. 8080 "Interferences (4)"
Detected sample type is invalid.
Possible causes: o Unsuitable sample type
o For Bilirubin: tHb value is less than 3 g/dL
Remedy: o Check sample material: sample too old, partially hemolyzed, unhomogenous,
incorrect anticoagulant.