Possible causes of a failed test
The table below describes possible causes of a failed test. When possible sources of error
have been checked and taken care of, run the test once again.
ActionCause
Make sure to prime all Q inlets and purge the System
pumps before method start, see Section 5.4.3 Prime Q in-
lets, on page 178.
Disturbances caused by
air trapped in Quater-
nary valve or any of the
System pumps
Replace piston seals. See ÄKTA avant Operating
Instructions, Maintenance chapter.
Disturbances caused by
damaged pump piston
seals.
See UV monitor U9-M and UV detector unit, on page 363Unstable or incorrect UV
signal, or drifting base
line - faulty UV monitor
Change mixer chamber or replace the Mixer. See Sec-
tion 7.8.2 Replace the Mixer, on page 338.
Wrong mixer chamber
size or faulty mixer
See Quaternary valve, on page 383Faulty Quaternary valve
See Section 8.6 Troubleshooting: Pumps, on page 397Faulty System pumps
Make sure that the system was correctly prepared, see
Prepare the Q valve test, on page 253.
Incorrect preparation of
buffer and tubing
ÄKTA avant User Manual 29035184 AE 255
6 Performance tests
6.5 Quaternary valve test
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