Roche Diagnostics May 2009
D-98 Service Manual · Version 9.0
7 Troubleshooting cobas b 221 system
Important test routines
Aggregates
T&D module
h At the ready screen, press
[System] > [Component test] > [Aggregates] > [T&D module].
Initialization: The T&D disc performs an automatic initialization.
Adjustment of disk: This function enables manual adjustment of an extremely twisted T&D disc
1
Move T&D disc to position 1, press "P 1".
2
Loosen retaining arm behind the T&D disc with an Allen wrench, T&D disc in
pos.1, press "Adjustment of disk".
3
Move the T&D disc to the correct position like shown on the screen.
4
Then tighten the retaining arm and press "Initialization".
T&D needle calibration: This function is used for adjusting the position of the T&D disk to the SIP tip. It must
be performed after replacing the SIP or the T&D tubing set.
1
Press "T&D needle calibration".
2
Press "Start".
Within the T&D needle calibration, the initialization is performed automatically.
Through air pressure measurement with the vacuum pump and baro sensor and
simultaneous positioning of the needle to a silicone area at the back side of the T&D
disk, the distance between the needle and the T&D disk is calibrated. If the needle
calibration fails (Offset–Status ) retry once again. If the error persists, verify that
the needle tip is flat. Replace the needle if necessary.
Figure D-5 T&D module test
Test SIP for leaks before needle calibration
Before performing the T&D needle calibration verify the sample inlet path and the sample needle
for leaks.
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