7.1
Problems and corrective actions
Cytiva support
NOTICE
If the suggested actions do not correct the fault, contact your local
Cytiva representative.
When contacting Cytiva for support, state the program version of the instrument. The
program version of the instrument is shown in the check menu, see Software version on
page 59.
General problems
Problem
Possible cause
Corrective action
No text on the display
No power to the monitor
Check that the mains
cable is connected and
the mains switch is in
ON-position
(I)
Noisy UV-signal, signal
drift or instability
The buffer may be impure
Check with water if the
signal is still noisy
There may be air in the
flow cell
If there is a lot of air in the
water, degas the buffer
continuously (we recom-
mend helium sparging).
Check the connections of
the UV cell optical fibers.
Dirt in the flow cell or
fiber connectors
Clean the UV cell, see
Cleaning the flow cell on
page 65
Ghost peaks
Air in the eluents
Degas if necessary (we
recommend helium
sparging)
Dirt or residues in the
flow path from previous
runs
Clean the flow cell and
flow path
Residues in the column
from previous runs
Clean the column in
accordance with the
column instructions
7 Troubleshooting
7.1 Problems and corrective actions
Monitor UVis-920 Operating Instructions 29055049 AF
69
