Roche Diagnostics May 2009
B-40 Service Manual · Version 9.0
4 Components cobas b 221 system
BG measuring chamber
b) Unscrew the two screws holding the VBI valve.
e
For details, see Figure B-62 on page B-83.
c) Remove the valve. Now slide the sensor out and remove it.
Optical sensor SS2:
a) Disassemble the mainboard unit.
e
For instructions, see Replacing the Mainboard unit on page B-89.
b) Unscrew the two screws holding the V22 valve.
e
For details, see Figure B-62 on page B-83.
c) Remove the valve. Now slide the sensor out and remove it.
Optical sensor SS3:
a) Disassemble the mainboard unit.
e
For instructions, see Replacing the Mainboard unit on page B-89.
b) Unscrew the two screws holding the V2 valve.
e
For details, see Figure B-62 on page B-83.
c) Remove the valve. Now slide the sensor out and remove it.
Optical sensor SS4:
a) Unscrew the two screws holding the VSI valve.
e
For details, see Figure B-62 on page B-83.
b) Remove the valve. Now slide the sensor out and remove it.
Use the reverse order for assembly.
BG measuring chamber
Replacing the BG measuring chamber
1
Disassemble the sample distributor cartridge.
e
For instructions, see Replacing the sample distributor cartridge on page B-35.
2
Open the BG measuring chamber, remove the electrodes and the electrode locking
lever and pull out the tube to the measuring chamber cartridge on the left side.
3
Close the measuring chamber and unscrew the three screws holding the BG
module (see below, B)
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