Roche Diagnostics May 2009
B-68 Service Manual · Version 9.0
4 Components cobas b 221 system
Bottle compartment
Replacing the gas dampers
1
Open the bottle compartment cover.
2
Left gas damper:
unscrew the five screws holding the left side panel of the cobas b 221 system and
remove the side panel.
Right gas damper:
unscrew the four screws holding the right side panel and remove the side panel.
3
Lift the front fork head of the respective gas damper from the retaining pin of the
bottle compartment cover with a screwdriver.
e
For details, see Figure B-49 on page B-67.
4
Lift the back fork head of the respective gas damper from the retaining pin of the
cobas b 221 system instrument frame with a screwdriver.
e
For details, see Figure B-49 on page B-67.
5
Remove the respective gas damper.
Use the reverse order for assembly.
Replacing the waste separator
1
Remove the cobas b 221 system top cover.
2
Disconnect all tubes from the waste separator.
Do not remove the fastening screws completely, because they are secured against loss.
Do not remove the fastening screws completely, because they are secured against loss.
Various components of the cobas b 221 system, such as T&D module, tubes, waste bottle, waste
separator etc., contain liquid biological residues after use that may cause infection.
Handle these components with care and avoid skin contact. To avoid direct contact with biological
materials, always wear appropriate protective equipment such as lab clothing, protective gloves,
safety glasses and, if necessary, a face mask. Additionally a face shield must be worn if there is a
potential of a splashback. Appropriate disinfection and sterilization procedures must be followed.
Always wear gloves when working with the instrument! The tubes may drip a little after being
disconnected. Remove excess fluids with a clean, absorbent cloth.
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