Roche Diagnostics May 2009
B-86 Service Manual · Version 9.0
4 Components cobas b 221 system
Val ve s
Replacing the waste valve V6
1
Switch off the cobas b 221 system.
e
Please pay attention to Shutdown on page B-19.
2
Disassemble the waste docking mechanism.
e
For instructions, see Replacing the waste docking mechanism on page B-69.
3
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.
4
Carefully pull the sample inlet path out to the right and remove it.
5
Unscrew the three screws holding the central measuring unit.
e
For details, see Figure B-2 on page B-20.
6
Raise the central measuring unit forward until it clicks audibly into place.
7
Unscrew the five screws holding the left side panel of the cobas b 221 system and
remove the side panel.
8
Disconnect the connectors from the V4/V6 actuator board.
9
Unscrew the screw holding the V4/V6 actuator board and slide the board to the
side.
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.
Do not remove the fastening screws completely, because they are secured against loss.
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