Trouble-shooting 5
Monitor UV-900 User Manual 18-1120-05 Edition AF
29
5 Trouble-shooting
5.1 General
When contacting GE Healthcare for support, state the program version of the
instrument, which is shown for 2 seconds after the self-test, during switch-on,
or in the menu
Check Service Mode
, see
page 35
.
5.2 Faults and actions
If the suggested actions do not correct the fault, call GE Healthcare.
Monitor UV-900
V1.06
WARNING!
The instruments must not be opened by the user. They contain
high voltage circuits which can give a lethal electric shock.
Fault Possible cause Corrective action
No text on the front display
No power to the monitor Check that the mains cable is connected
and the power switch is in ON-position I
Noisy UV-signal, signal drift
or instability
The buffer may be impure Check if the signal is still noisy with water
There may be air in the flow cell Check that the flow restrictor gives a back
pressure of 0.2 MPa in ÄKTAexplorer, and
3-5 MPa in ÄKTApurifier
If there is a lot of air in the water, degas
the buffer continuously (we recommend
helium sparging)
Check the connections of the UV cell
optical fibers
Clean the UV cell, see section 4.4
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 system in accor dance
with ÄKTAexplorer or
ÄKTApurifier System Manual
Residues in the column from
previous runs
Clean the column in accordance with the
column instructions
Bad mixing of the eluents Check that the mixer is functioning
correctly and that the correct chamber
volume is being used
Error in external chart
recorder
The recorder not properly set up Check the chart recorder in accordance
with its manual
Monitor UV-900 not properly set
up
Test the recorder function by selecting
recorder test according to section
Check
Analogue Out
on
page 35
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