Roche Diagnostics May 2009
Service Manual · Version 9.0 B-39
cobas b 221 system 4 Components
Sample distributor (SD)
Replacing the SS1, SS2, SS3 and SS4 optical sensors
1
Remove the top cover, printer cover and T&D cover of the
cobas b 221 system.
2
SS1, SS2, SS4: disassemble the sample distributor cartridge.
e
For instructions, see Replacing the sample distributor cartridge on page B-35.
SS3: disassemble the Hb cartridge.
e
For instructions, see Replacing the Hb cartridge on page B-63.
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
Disassemble the cobas b 221 system fan unit.
e
For instructions, see Replacing the main fan unit on page B-110.
8
Unscrew the two screws holding the mainboard unit.
e
For details, see Figure B-66 on page B-89.
9
Fold the mainboard unit down.
10
Disconnect the sensor on the sample sensor board.
e
For instructions, see Replacing the sample sensor board on page B-91.
11
Optical sensor SS1:
a) Disassemble the mainboard unit.
e
For instructions, see Replacing the Mainboard unit on page B-89.
Make sure that there is no contamination between heating plate and sample distributor cartridge.
When installing the BG, ISE and MSS modules, make sure not to confuse the modules and plug-in
connectors!
During assembly, ensure the correct installation of the fluid seal between lateral channel and pump
frame!
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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