GE UVis-920, Operating Instructions Manual

Page: 59 / 71

7.1 General
When contacting GE for support, state the program version of the instrument, which is
shown in the check menu. See
Software version, on page 52
7.2 Faults and actions
If the suggested actions do not correct the fault, call GE.
Corrective action Possible cause Fault
Check that the mains ca-
ble is connected and the
mains switch is in ON-po-
sition (I)
No power to the monitor No text on the display
Check with water if the
signal is still noisy The buffer may be impure Noisy UV-signal, signal
drift or instability
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. There may be air in the
flow cell
Clean the UV cell, see
Cleaning the flow cell, on
page 56
Dirt in the flow cell or fiber
connectors
Degas if necessary (we
recommend helium
sparging) Air in the eluents Ghost peaks
Clean the flow cell and
flow path Dirt or residues in the flow
path from previous runs
Clean the column in accor-
dance with the column in-
structions Residues in the column
from previous runs
Check the chart recorder
in accordance with its
manual The recorder not properly
set up Error in external chart
recorder
Test the recorder function
by selecting recorder test
according to
Check analog
output, on page 50
Monitor UVis-920 not
properly set up
Monitor UVis-920 Operating Instructions 29055049 AD 59
7 Troubleshooting
7.1 General