Roche Diagnostics May 2009
B-76 Service Manual · Version 9.0
4 Components cobas b 221 system
Vacuum system
Replacing the vacuum pump
1
Remove the vacuum pump completely.
e
For instructions, see Replacing the vacuum pump completely on page B-73.
2
Disconnect the waste tube on the inlet side of the pump unit.
e
For details, see Figure B-58 on page B-75.
3
Disconnect the pump motor cable from the vacuum control board.
e
For details, see Figure B-58 on page B-75.
4
Unscrew the screw holding the vacuum control board and slide it to the side.
5
Unscrew the three screws holding the pump unit and remove it.
6
Unscrew the three low-frequency bearings of the pump unit and fasten them to
the new pump unit.
The remaining assembly is done in reverse order.
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.
A Vacuum control board B Holding screw
Figure B-59 Vacuum control board
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