Roche cobas b 221 system

Roche Diagnostics May 2009
D-72 Service Manual · Version 9.0
7 Troubleshooting cobas b 221 system
Value flag s
o Remove the electrode and tap the body of the electrode with a finger nail to detach
any air bubbles from the electrode membrane.
o Call up the stability monitor and check "Details" of the "Electrode slope". If the
electrode/cartridge is defective, it is displayed. Replace the corresponding
electrode or cartridge.
e For the details, see Stability monitor on page D-120.
o Check ground cable plug connector on bottle compartment cover.
o Check seating of the pump gasket of the MSS output pump.
e For the details, see Peristaltic pumps (PP) on page B-64.
o Insert electrode simulator and act accordingly.
o Replace affected measuring chamber.
e For the details, see BG measuring chamber on page B-40, ISE measuring chamber
(cobas b 221<3>–<6> systems only) on page B-42 and MSS measuring chamber
(cobas b 221<5/6> systems only) on page B-44.
Flag no. 2012 "Sensor signal is drifting"
The sensor signal is drifting.
Possible causes: o Invalid sample type used
o S1 Rinse Solution contaminated
o Aspiration of S1 Rinse Solution not ok
o Bubbles in internal electrolyte of the electrodes on the membrane
o Interference signals in the measuring path during measurement value acquisition
Remedy: o Perform "Calibration for Ready".
o Remove the electrode and tap the body of the electrode with a finger nail to detach
any air bubbles from the electrode membrane.
o Call up the stability monitor and check "Details" of the "Electrode slope". If the
electrode/cartridge is defective, it is displayed. Replace the corresponding
electrode or cartridge.
e For the details, see Stability monitor on page D-120.
o Call up fill routine "Aspirate rinse".
h [System] > [Utilities] > [Fluid actions] > [Fill routines] > [Aspirate rinse].
o Replace S1 Rinse Solution.
o Replace measuring chamber cartridge.
e For instructions, see Replacing the measuring chamber cartridge on page B-48.
o Insert electrode simulator and act accordingly.
o Te s t /re pl a c e V 4.
e For instructions, see Replacing the air valve V4 on page B-88.
o Check/replace air tube at V4.
Flag no. 2016 "Signal too high"
The 1st sampling value of the O
2
zero point calibration is >60 mV.