Roche Diagnostics May 2009
B-66 Service Manual · Version 9.0
4 Components cobas b 221 system
Peristaltic pumps (PP)
Replacing the pump head
1
Remove the cobas b 221 system top cover.
2
Open the locking lever (Plexiglas cover) of the peristaltic pump and slide the
linear clamp (white plastic part) up.
e
For details, see Figure B-46 on page B-65.
3
Remove the pump tube.
4
Loosen the setscrew on the pump head with a 1.5 mm Allen wrench.
5
Pull the pump head up.
6
Connect the new pump head and fasten it with the setscrew. Note that the
setscrew must grip the flat side of the shaft (remove blue cap).
7
Position the pump tube around the pump head. Note that the tubes must not be
crossed.
The remaining assembly is done in reverse order.
A Setscrew
Figure B-47 Pump head
A Flat side of shaft
Figure B-48 Pump head shaft
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