Roche Diagnostics May 2009
B-50 Service Manual · Version 9.0
4 Components cobas b 221 system
Measuring chamber cartridge
7
Remove the tube adapter from the MSS module.
8
Disconnect the two tubes that run from the sample distributor cartridge to the
measuring chamber cartridge.
e
For details, see Figure B-22 on page B-36.
9
Unscrew the five screws holding the measuring chamber cartridge.
e
For details, see Figure B-29 on page B-48.
10
Pull the measuring chamber cartridge up and remove it.
Use the reverse order for assembly.
Replacing the MC Actor Control Board
1
Remove the top cover and the T&D cover of the cobas b 221 system.
2
Rotate the T&D lock on the T&D module 90 degrees to the right.
e
For details, see Figure B-4 on page B-22.
3
Carefully pull the sample inlet path out to the right and remove it.
4
Unscrew the three screws holding the central measuring unit.
e
For details, see Figure B-2 on page B-20.
5
Raise the central measuring unit forward until it clicks audibly into place.
6
Disconnect all valves of the measuring cartridge and the valve bus cable on the
MC Actor Control Board. Note the valve plug labels printed on the MC Actor
Control Board.
7
Lever the MC Actor Control Board from the snap fastener and remove it.
Use the reverse order for assembly.
Do not open the cartridge!
Do not open the cartridge during replacement.
Do not remove the fastening screws completely, because they are secured against loss.
Electrostatically sensitive components!
Do not remove the fastening screws completely, because they are secured against loss.
The sample inlet path must be removed at this time, otherwise it will be destroyed by folding the
central measuring unit out.
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